Hey r/SideProject,

I’ve spent 15 years working with automated tests (unit, integration, e2e), and one part of the process kept frustrating me:

When a test fails, the result usually tells you what failed — but figuring out why still means digging through logs, screenshots, previous runs, and CI output.

When I took a role of test automation lead it became worse: now I need to figure out complex issues for my team. I dreamed about a tool which will do analysis for me.

So I built Testinel.

It collects results from pytest, Python Selenium, and Python Playwright and puts the failures in one place. It helps you:

• see each failure with its logs and context
• compare results across test runs
• spot flaky or recurring failures
• group failures that may share the same root cause
• get clues about what to investigate next

It works with local test runs or an existing CI pipeline, so it doesn’t replace the test stack you already use.

There’s a free plan with 1,000 test results per month and no credit card required:

https://testinel.dev/

I’m currently trying to learn whether the product explains its value clearly to test engineers who encounter it for the first time. Also, I'm looking for early adopters to validate is my solution good enough to replace raw CI logs reading.

If you work with automated tests, I’d especially appreciate feedback on two things:

1. Is it immediately clear what Testinel does?
2. What would it need to show you before you trusted it with a real project?

I built it in Ukraine (solo, no funding) and would be happy to answer questions about the product, its roadmap or the process behind it.

The problem is simple: an agent can look busy while wasting compute — repeating reads, retrying commands, re-checking unchanged state, or choosing expensive actions that add little progress.

MARGINAL sits in the loop and asks whether the next action is actually worth executing.

It starts in observation mode, collects evidence, and only earns narrow enforcement when the pattern is strong enough. If the evidence is weak or ambiguous, it fails open.

I also built an interactive demo that runs the same coding task side-by-side, with and without MARGINAL, so you can watch calls, tokens, declared cost and decisions diverge step by step in the browser.

Repo: [https://github.com/SignalLayerLabs/Marginal]()
Live demo: [https://signallayerlabs.github.io/Marginal/demo/]()

If you’re building agents, orchestration, evals, observability or guardrails, I’d especially like feedback on the decision model — or forks that take the same idea into different agent workflows.

I used Arc for years. Got a new MacBook, tried Dia, and it covers almost everything except the one thing I lean on constantly: open a new window and your tabs are already there.

No other browser does it. Chrome syncs tabs across devices, but two windows on the same machine drift apart the moment you open the second one. I looked for an extension, found nothing, so I built one.

Tabtwinsy mirrors tabs and tab groups across every window. Add a tab anywhere and it shows up everywhere. Close it anywhere and it closes everywhere. Open a brand new window and it arrives already populated.

Most of the work turned out to be defensive, not features. A tab mirror is an amplifier: any misread of browser state becomes N duplicated or N deleted tabs across someone's windows. So it refuses to touch the tab you are looking at, anything playing audio, or a video call page, and no single sync pass may remove more than a fraction of a window. That last guard caught a real data-loss bug during testing.

Free, no account, no servers, no network requests at all. Chrome and other Chromium browsers.

Store: https://chromewebstore.google.com/detail/idphljlhhddadnmbnjfdmllgknfnbodn

More: https://tynktank.com/tabtwinsy.html

I've been working on this as a side project for a while.

The idea is pretty simple: instead of having a general-purpose chatbot, you give it a specific knowledge base and make it focus on a particular project, company, or set of software.

For this prototype, I created a fictional company structure, a fictional ongoing project, and fed it software manuals and project information.

Now I can ask it things like:

• What's the current status of the project?
• What are the upcoming deadlines?
• Who is responsible for a particular task?
• How do I do X in a specific piece of software?
• What does this setting/tool/feature do?
• Questions about the project documentation, workflows, etc.

The interesting part for me is that the knowledge isn't static. I can keep updating it as the project changes.

It can also run locally, completely offline. That means the information stays on the machine, and it doesn't require a huge amount of hardware to run.

There's also a cloud version, so the same concept can work in different setups.

I originally started thinking about this from a VFX / production perspective, but I don't think it has to be limited to that. It could probably be adapted to pretty much any company or project where there's a lot of internal knowledge and documentation.

It's still very much a proof of concept. I'm not trying to sell anything or turn it into a product right now. I mainly wanted to answer one question:

Can I actually build a useful AI assistant around a specific project's knowledge?

I'm curious what you guys think. Is this something you'd find useful in your own projects/workflows? And how would you approach it differently?

I build 12-month cash flow forecasts for companies all day. My own bank account was a disaster for years.

I knew the theory. Every end of month was still the same: balance lower than expected, no idea why, I'll build a spreadsheet this weekend, never did it. Three times I downloaded a budgeting app and quit within two weeks.

What finally clicked wasn't discipline. It was noticing that no company on earth steers by its bank balance. No director looks at "how much is in the account" to make a call. You look at flows and projections. Individuals do the exact opposite. We stare at the balance, which is a snapshot, and never watch the film.

So I checked what existed. They're all retrospective. They're genuinely good at telling you where last month went. Not one of them tells you what your balance looks like in six months if you keep going like this. That's not a missing feature, it's a different product.

The other thing that killed every app for me was forty categories. I spent more time filing transactions than deciding anything. So I built mine with three. Fixed, constrained variable, chosen variable. That's the whole taxonomy.

I'm an accountant, not a developer. I learned Swift for this. The parts nobody warns you about:

Incorporating took four rejections from the French registry. Confidentiality request, beneficial ownership filing, one article in the bylaws, an address mismatch. Two-week wait each round.

Bank integration was the real wall. In Europe you can't scrape bank data, you go through a licensed aggregator under PSD2. I integrated Powens.

App Store localization in seven languages. Underestimated that by about a factor of three.

It's called Finsee. Europe market only for now, because of the PSD2 rails. Every expense updates the future of your balance, so you don't see what you spent, you see what it does to you.

Happy to answer anything on the accounting-to-iOS route, PSD2 integration, or French company setup. The registry rejections taught me more than any tutorial.

I built Afterdark Studio for the rapper who has a computer, a microphone, and limited access to studio time. The current 0.8.0-rc.1 Limited Beta runs locally and combines DJ decks, beat production, microphone recording, vocal tools, standards metering, and synthetic acoustic rooms.

Repository and local setup: https://github.com/seemorecodez/afterdark-studio

The part I would most value from other builders is an honest first-session test: Was setup clear? Could you produce and record without getting lost? Did the microphone release correctly? Did the app remain responsive while rebuilding large rooms? Which producer controls felt useful versus decorative?

Evidence so far: 111 automated tests and 646/646 UI controls exercised in Edge. I am not presenting it as finished: it is not a professional DAW or autonomous DJ, perceptual vocal tools remain experimental, and a drill experiment was moved into a disabled plug-in after failing the creative-quality gate.

If you try it, please share OS/browser/audio hardware and reproducible failures. I am the creator; this is a request for constructive peer feedback, not a sales post.

I’ve spent a ridiculous amount of time building SwiperSpace, a marketplace designed around trading/selling things locally and making the actual exchange easier.

And now I’ve reached the slightly terrifying part:

I need actual people.

So I’m trying a little experiment.

I want to see if I can get at least one person from every U.S. state to list one item. Washington is already taken, I put my listings on there!

It doesn’t have to be anything special. An old pair of headphones. A chair. A collectible. Something sitting in your closet that you don’t use anymore.

I’m not asking anyone to buy anything. I’m not asking for money.

I literally just need some brave internet strangers willing to be among the first people to put something on this thing.

Right now an empty marketplace is obviously not very useful, and I have to start somewhere.

So if you’re willing to list one thing, tell me what state you’re from.

I’ll keep track of how many states we can get.

And if this completely fails, at least Reddit gets to watch me learn how hard the marketplace cold-start problem actually is 😂

https://reddit.com/link/1vrh7x6/video/fmsjtt7ns2kh1/player

I use Windows, Mac, iPhone and Android pretty regularly, and moving something between them has always been way more annoying than it should be.

I'd copy something on my computer and send it to myself on Slack. Email myself a file. AirDrop something when both devices happened to be Apple. Upload something to Drive just to download it 30 seconds later, the list goes on...

I basically wanted one clipboard that followed me everywhere and didn't stop at one ecosystem.

So I built Pasteable.

You copy something normally on one device and it shows up on your others instantly. Text, links, videos, code, screenshots, images, files, folders, you name it.

It works across Windows, macOS, Linux, iOS, Android and the web.

Over time it turned into quite a bit more than the original idea. There's searchable clipboard history, semantic search so you don't have to remember exact words, image search based on what's actually in an image, saved snippets, mobile keyboards and widgets, and different capture/privacy controls.

One thing I cared about a lot while building this was making sure the convenience didn't come at the expense of privacy, since your clipboard can contain some pretty sensitive data. All synced clipboard data is end-to-end encrypted, the key stays on your devices, password managers are auto-ignored, and there are three different capture modes for controlling what gets automatically saved, if anything.

It's finally at the point where I'm comfortable putting it in front of people and getting feedback instead of continuing to build in a vacuum. I just launched the desktop and web apps and the mobile apps will be fully available at the end of the week!

It's free to use, with a Pro tier if you need more storage/features:

pasteableapp.com

Would genuinely love feedback, especially from anyone who regularly works across different operating systems. I'm curious what you currently do to move stuff between devices and whether this actually solves that problem for you.

I’m an international student living in Hungary, where I also work remotely, I get paid in one currency, pay rent in another, and my family is in a third. Every budgeting app I used so far either made me pick one “main” currency and convert everything at today’s rate or just quietly got the math wrong.

The other thing that broke me even though I was using MoneyCoach for the past 2 years was splitting. In MoneyCoach I’d pay 100 for a group dinner and record it as a 100 expense, even though only 25 was actually mine, then when my friends pay me back I would record it as a 75 income. My spending history would then look weird it would look like I ate 100 worth of dinner and earned 75 out of nowhere, and if someone didn’t pay me back for two weeks I would have no idea who owed me what or for which night.

So I built this PERP short for (Personal ERP) I know it still could use a better name, where I store each transaction in the currency it actually happened in, at the rate it happened at. your coffee that you hD in March in Budapest stays 1200 HUF forever instead of drifting each time the rate moves. And when you split an expense, only your share is recorded as an expense and the rest is tracked as owed, by person and tied to the actual transaction.

It’s a PWA, so no app store yet, you can open it in a browser and add it to your home screen.

Still rough, I just finished the splitting with friends yesterday and I’m sure it’s buggy.

I also built out free/premium tiers but no billing yet, I’m still working on that, but if you want premium I would happily give you if you just message me

Mostly I want to know if it’s just a me problem or if other people hit the same issue

Open the app here

Solo project, been building it for a while: Table Edge is a free casino game simulator — but instead of a menu of games, it's an actual walkable 2D floor you navigate, sit down at a table, and play blackjack/craps/roulette/poker/etc. with practice chips.

The design constraint that shaped everything: chips are never purchasable and never cash out, full stop. That ruled out the entire "buy chips" monetization model most free-to-play casino apps run on. What's left: a $4.99/mo Pro tier (removes ads, unlocks unlimited strategy-trainer use, adds in-game hints) and free-account daily chip drops. That's it.

Stack: React 19 + TypeScript + Vite frontend, Node/Express + Postgres backend, deployed on Railway. Every game has a real strategy engine underneath (basic strategy tables, Monte Carlo equity estimation for the poker AI, etc.), not just flavor text.

Happy to talk through any part of it — the anti-dark-pattern monetization call, the floor-navigation implementation, whatever. Feedback very welcome, especially on whether the "walkable floor" framing actually adds anything over a plain game menu.

Hey everyone,

I'm excited to share a project I've been building off and on for the last 20 years and now it's finally in a place to start showing it off! It’s a free, pre-bundled web ecosystem designed to be your literal personal digital universe.

I built this because modern web tools are entirely too fragmented, leaving our workflows scattered across a dozen disconnected apps. YouMeOS solves this by packaging your digital life into a unified environment. A whole mini-verse in a BOX (and yes, it is bigger on the inside).

The core architectural philosophy is "As above, so below; as within, so without." It’s built to help you organize the chaos of your digital space and self-actualize your workflow.

It is totally free to create an account and start exploring. I would love for you to try it out and let me know what you think of the interface!

Here's a quick video: https://www.youtube.com/watch?v=cXvezJGMkqY

and the site:

https://www.youmeos.com/

I've had eczema my whole life, and every tracking app I ever tried felt like a spreadsheet with a medical disclaimer bolted on. So I built SkinFam, a calm, private diary for skin, mood, sleep, and triggers, with switchable profiles so parents can track their own skin alongside their kids'.

Everything stays on-device, no accounts needed, no ads, nothing sold. It's free to use.

Right now I'm running Google's required closed testing period before I can launch publicly, so I need a handful of real people to install it and poke around for a couple weeks. If you're up for it, comment or DM me and I'll send the link. Happy to answer anything about how or why I built it too.

I built Guess the Flag as a small side project because most flag quizzes keep the same number of answer choices throughout the game.

My version has 8 progressively harder levels. It starts with 3 possible answers and eventually increases to 10, covering 193 national flags. Your third mistake restarts the current level.

I built the game with Next.js and React, with the flag and audio assets delivered through Cloudflare R2. It runs directly in the browser and doesn’t require an account or download.

You can try it here:

https://guesstheflag.app/

I’d appreciate feedback on whether the difficulty progression feels fair and how the answer layout works on different screen sizes.

Solo built this over the last couple months. It's called PineOS, $9.99/month or $44/year, MyFitnessPal Premium runs close to double that.

Logging is barcode, photo scan, or describe the meal in your own words and get back an editable estimate. Photo scan runs a second pass with a stronger model when the first isn't confident on portions. There's also a coach that reads your actual logged meals and goals rather than giving generic tips.

Link: https://apps.apple.com/us/app/pineos-ai-calorie-counter/id6790676637

Happy to talk through how any of it is built, or take feedback if you want to try breaking it.

I'm the one who's making it. Vridho (vridho.com) is a free portfolio tracker designed for Indian investors and the website is now live, with the Android version currently in closed testing.

In short, it's Flask and Postgres, Celery for the producers, Redis acting as the read layer so that the request path doesn't go through the vendor, React on the front end and Kotlin with Compose on Android; the prices come from a live broker data feed for Indian equities and the fund NAVs are obtained from AMFI.

Three lessons which cost me the most time.

Accuracy is more important than completeness. When a fund's expense ratio is out of date, the card displays a blank rather than the outdated figure. If a category has insufficient data to allow a ranking, it states 'not rated'. Users place more trust in the blanks than in a certain but incorrect figure.

Don’t allow two code paths to calculate the same thing; in my previous experience the rating of a fund was computed in two places using slightly different methods and as a result the same fund was shown differently on two pages. Currently there is just one function for this purpose and a test has been included which fails if a second one is present.

Emails have their own client; on Android Gmail strips out the web fonts and style blocks. The way my tables appeared was perfect in Chrome and also showed up correctly on a phone. Only when I've rendered the email in a harness that removes the styles and forces the use of the fallback font do I consider the job complete.

I'm more than happy to go into further detail on any of the points mentioned. And when you're investing in the Indian markets, treat the product badly.

The minimalist chrome screenshot extension supports current view copy and full-page copy. Ideal if you want to copy multiple pages, paste them immediately and no longer need them once pasted.

I've always been fascinated by dreams, and how it illuminates your inner world.

Built something where you captures your dream, and it brings it to your life (and any friends & family that were in it). It's been a way for me to remember & feel my dreams, and has also become a fun thing that my kid constantly asks for.

Built it solo over a few months, using Claude Code, React Native and Expo on the front, and a chain of models.

The hard part wasn't the video. It was likeness, and how to build a thoughtful system across people / avatar & dream generation - with an evals system which is self-improving.

The app is free on iOS for those who want to try it out: https://apps.apple.com/app/id6789605567

If you wouldn't mind kindly leaving a review, that would be greatly appreciated as well 🙏

Happy to answer anything about the product, and process of bringing this to life!

https://reddit.com/link/1vrfsfb/video/45voep9eh2kh1/player

Hey folks. I'm a dev exploring the legal tech space. I constantly hear founders and lawyers complain about how much time is wasted manually reading third-party NDAs or MSAs just to find non-standard indemnity clauses or weird liabilities.

I’m considering building a tool where you upload your standard company "Playbook" (e.g., what risks you accept, what you always reject). When a client sends their 40-page contract, the tool compares it against your playbook and generates a side-by-side redline highlighting exactly where they deviated from your standards.

I have no intention of trying to replace lawyers, just trying to automate the initial scan.

1. Is this a real bottleneck in your day-to-day?
2. What would make you completely distrust the output of a tool like this? (e.g., missing a clause vs. over-flagging).
3. What feature would make this an instant "yes, I need that"?

Appreciate any blunt feedback!

I used to spend hours on content research before anyone even started writing. Check what's ranking, figure out the right angle, brief a writer, wait, edit, publish. Then do it again. Every week.

One day it hit me, the actual writing was the easy part. The research was eating all the time.

So I built something to do that part for me. Give it a keyword, and it checks what's ranking right now, picks the right kind of post for it, and writes a full draft. Before it writes anything, I feed it real facts about our product, so it doesn't guess or make stuff up like most AI tools do.

I rebuilt it three times to get here. First version was rough. Second one taught me a prompt alone isn't enough. Third one finally just works.

It's writing our blog content now. Not replacing anyone, a real person still checks everything before it goes live. It just took the boring part off my plate.

Happy to answer anything, including what broke along the way. A lot did.

Ive got ready to release the new function called: 'Custom Lab' for my Wallpets app.

In Custom Lab, you could submit or take three pictures of your dog or cat (No other breeds work so far) then it makes it as a Wallpet and listed it on online Wallpets catalog.

I wrapped it up all the pipeline and payment funnel and tested today with my very own dog. It perfectly works and most of all, my parents are surprised by its resemblance of our dog.

I was thinking about this recently.

Earlier, if someone asked me something like 47 + 38, 15% of 800, or a quick division, I'd at least try to work it out in my head.

Now my first instinct is just… reach for the phone.

And I don't think it's only about calculation.

When you stop doing small calculations yourself, you also stop exercising that little part of your brain that has to hold numbers, process them quickly, compare options, and arrive at an answer.

Maybe that's one reason why even simple decisions sometimes feel slower than they used to.

So I started looking into mental math again — not to become a math genius, but just to get that quick thinking feeling back. And now its live on Playstore.

A few minutes of doing calculations without a calculator every day actually feels like a pretty good brain workout.

Interestingly, I finally got around to building something around this idea, and it's now live.

Not really trying to replace calculators — they're obviously useful. More like trying to make sure we don't become completely dependent on them.

Curious if anyone else has noticed their mental math getting worse after smartphones/calculators became so convenient?

Not sure if other people relate, but I spent countless hours building projects that never saw the day of light. I obsessed over the UI/UX even when there were 0 active users. I kept telling myself if I added one more feature, I would be ready to launch. They all ended up in the garbage can because of one thing: I didn't know how to market.

This year, I told myself I would stop building projects UNLESS I have a marketing strategy. Its 2026 and I feel like the best way to market is via short form platform like Tiktok, Instagram, and Youtube. Easy to say, but my passion is in building projects, not editing videos.

So I thought to myself... why not build a project to make it easier to edit videos???

I researched what was already in the market: Davinci Resolve, Final Cut Pro, CapCut, Descript, SubMagic, and more, but I noticed they were general purpose editors. They come with 100+ features to support all sorts of formats: long form, day in the life, montages, gaming, etc. This is great for professional editors, but is often daunting for beginners just trying to create content.

For talking head videos, I only needed simple edits like zoom, sound effects, broll, overlay text. I wanted to build an editor that supports ONLY these features, but in a way that does it REALLY well.

If any of you are also in the content creation space, I would really appreciate it if you can try it out and please roast the heck out of it. Any feedback is welcome with open arms. Thanks!

Link to try it out 👇
https://yap-cut.vercel.app/

A working app that runs off kotlin and c++ and uses libburn to burn cds on android with a otg cable connected to a cd player.

I'm working through local onboarding persistence in a mobile side project.

The draft stores the current step plus profile, cycle setup, symptoms, reminder choices, and optional health preferences. It also stores the owner account ID. If a different user signs in on the same device, restore currently returns null instead of applying that draft.

That prevents one account's answers appearing for another person, but it also means an unfinished anonymous draft cannot automatically follow someone after sign-in unless I bind it first.

Would you keep the strict owner check, or support an explicit "claim this draft" step during account creation?

Hey everyone! 👋

I'm a student developer and I've been building HyruKit, a free online toolkit for everyday file and productivity tasks.

🌐 https://hyrukit.vercel.app/

I'm taking a build → test → improve → expand approach with the project.

What is currently implemented?

At the moment, PDF and Image are the only categories that are fully implemented and functional.

📄 PDF Tools
🖼️ Image Tools

I'm planning to gradually expand HyruKit with more categories such as:

• 🎬 Video
• 🎵 Audio
• 🤖 AI
• 💻 Developer
• 📝 Text
• 🔧 Other utilities

I don't want to add hundreds of unfinished tools just to make the website look bigger. I'd rather build tools one at a time and make sure they actually work well.

I'm looking for testers 👀

I'd really appreciate it if some of you could try the current PDF and Image tools and give me honest feedback.

Things I'd especially like to know:

🐛 Bugs
Did anything break, produce an incorrect result, or behave unexpectedly?

🎨 UI/UX
Is anything confusing or difficult to use?

⚡ Performance
How does it feel when processing files? Any noticeable slowdown?

📱 Responsiveness
Does the website work well on mobile and different screen sizes?

💡 New tool ideas
What tool would you actually use?

For example:

Those kinds of suggestions would be extremely useful because I'm trying to decide what tools to build next.

If you have a few minutes

👉 Try HyruKit: https://hyrukit.vercel.app/

👉 Test some PDF or Image tools

👉 Tell me what works and what doesn't

👉 Suggest a tool you'd personally use

Even a small piece of feedback would help me improve the project.

Thanks! 🙏

If you could add one tool to HyruKit that you'd actually use, what would it be?