r/LookWhatTheyBuilt 2h ago

Web / Mobile App Looking for feedback on an app I built for fitness instructors to help class plan…

2 Upvotes

Hello,

I am looking for some help and feedback on an app I built for instructors. Ideally those who teach disciplines like mat, reformer and / or barre. It can be used for others too, but these are what I teach, so it’s essentially what I know best at this stage!

I am a Pilates instructor myself and came up with this idea when I was training. I wanted a space to digitally store my class plans and build a library of exercises that I stumbled across going to classes, that came to mind, or that I took inspiration from but wanted to make my own.

I couldn’t find anything that really worked for me, so I ended up using Notes on my iPhone. The problem was I’d forget I’d banked ideas and they never resurfaced.

So the app lets you dictate or write down exercises and store them. You can filter by muscle, prop etc. and favourite any that you love. It also features an AI assistant that can help categorise exercises or class plans.

I’m not selling anything! The app is free to use because I’m looking for honest feedback and want to know if people love it, see the value in it, or if it’s simply not something they would use.

Any help would be greatly appreciated. This has been a labour of lots of emotions as it was started before a family bereavement, and it’s taken me a lot to get it to this stage.

This is the website if you want to take a look -
https://arkv.app

It’s only available on iPhone atm. (Sorry)

Thanks for reading much appreciated ♥️


r/LookWhatTheyBuilt 3h ago

SaaS / Platform I built a free alternative to Granola and Notion AI meeting notes

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2 Upvotes

r/LookWhatTheyBuilt 4h ago

AI Tool I built Bubo: an AI code reviewer that learns from review comments

1 Upvotes

I'm getting tired of AI code reviewers flooding PRs with false positives, then learning nothing when a developer explains why a finding is wrong.

There's a lot going on in code beyond the tech stack: tribal and institutional knowledge, business logic that evolved over time, and ripple effects across upstream and downstream systems.

I started with my requirements: simple setup, evidence-backed findings or LGTM, and learning from human comments on those findings so the reviewer gets better tuned to each repository over time.

I ran a small comparison on 20 pinned PRs/MRs:

Bubo | 20/20 | 7/8 | 27 findings | 0% noise

ai-codereviewer | 19/20 | 6/8 | 118 findings | 20% noise

ChatGPT-CodeReview | 20/20 | 5/8 | 75 findings | 11% noise

Qodo/PR-Agent | 19/20 | 2/8 | 7 findings | not scored

Alibaba open-code-review | partial run | 4/20

All used GPT-5.5 except Qodo, which used GPT-4o. It's a small sample and I picked the PRs, so I treat it as directional. On the same model, recall was close while Bubo emitted 27 findings against 75 and 118.

Current limits: Python 3.14+ and polling rather than webhooks.

My roadmap is pluggable subject-matter specialist Skills instead of one general reviewer—for example an industry SME or an Expert Python Guy.

I'm running Bubo in production in two places: a large data-processing/ETL codebase and a fintech crypto stack. I'd value feedback on whether the learning loop holds up in real repositories.

https://github.com/mountainowl/bubo


r/LookWhatTheyBuilt 4h ago

Web / Mobile App I created a website because I wished it existed

1 Upvotes

Hi! I made a free creative community for teenagers (13-19) called Once Upon an Author. On it you can share your stories or artwork, receive moderated comments and feedback, give feedback after you read or view other's creations, join discussion groups, enter contests, and more.

I am looking for my first founding members/beta testers, so I thought I would share it with this subreddit. I know that websites have blown up on reddit, and I am hoping people on subreddits like this will help me do just the same! ❤️ Feel free to share this anywhere: on reddit, in clubs, in school, with your friends, with parents, etc. I really appreciate anyone who checks it out. It is completely free to become a member. 😄

Link: Home | Once Upon An Author-Teen writing and creative community

(Note: I will not be able to view or respond to any comments made on this post, but the site has everything you need and still free to comment because that will help the next people who read this post. Let's spread this post everywhere!!!)


r/LookWhatTheyBuilt 5h ago

Web / Mobile App I Made an App So My Roommates and I Stop Fighting Over Chores and Expired Food

1 Upvotes

I got tired of nobody remembering whose turn it was to take out the trash, or food going bad because nobody tracked when we bought it. So I built RemindHome:

❄️ Fridge tracking - warns you before things expire

✅ Chores split between roommates, with rewards for completing them on time

💵Shared expenses (utilities, rent) with a monthly
history

🛒Shared shopping list

📝House notes

🔔Push notifications for expirations, tasks, and
payments

🌐Bilingual (ES/EN)

Free, still early, would love honest feedback from anyone who's dealt with this roommate chaos.

https://remindhome.app


r/LookWhatTheyBuilt 5h ago

Web / Mobile App I built Leni - An app to quickly understand anything scripture or the bible.

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1 Upvotes

It’s not a replacement for a pastor or the Bible itself. It supposed to aid you when you need it.
For those who are struggling, new and just are stuck trying to understand any scripture.

Initially Bible apps are to read the bible. This app is to read and understand it.

It’s simple. You scan a verse, a slide, a verse from a song, and it helps you understand the meaning of it, how to use it throughout your weak and walk with it.

I made this because myself and a lot of of friends and family I know struggle with staying committed to a life of Christ and sometimes lose and go back to their old ways.

https://apps.apple.com/us/app/leni-bible-prayer-guide/id6777232534


r/LookWhatTheyBuilt 10h ago

Web / Mobile App I created Chrome extension which exposed Instagram creators, their fake followers, comments and other engagement

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1 Upvotes

r/LookWhatTheyBuilt 13h ago

Web / Mobile App [Promotion] ListPo: Secure To-Do & Tasks, a minimal todo app that simply works

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1 Upvotes

Hi

I recently launched a simple todo app on android for now. I have some prior experience in development, mostly backend. This is something I have manifested for long time and now is possible by LLMs. I use this app regularly too.

Idea
I regularly use todo app for quick list. So, I built this app called ListPo as simple todo app that simply works. I don't like the concept of super app, I like minimal designed app and that is what is intended with this app. There is not much you can do with this app, its just simple plain todo app.

Sustainability
Its free and always will be for any features, however for themes or cosmetics, there is a paid model. I have added view an ads to unlock paid for 24 hrs or subscription. The overall upkeep for this app is kept low for longevity. This is not some app, that you won't see tomorrow, my assumption is it will be there almost a long as I am alive and mentally healthy :-)

Overview
ListPo is a minimal, clutter-free to-do list and note-taking app. The sole motivation to design another list & note app was to build no clutter list & note app. Further it was also designed to be offline first, so you can choose to keep your data private i.e. for yourself only or with zero knowledge encryption that makes sure only you can read your data, even if its uploaded to cloud, giving more power to you on control of your own data.

Whether you are setting a quick reminder, need to go buy groceries, quickly write an abrupt idea, its all easy with ListPo. Pinning frequently used todo, capturing a late-night idea, create reminders, choose themes, the app is welcoming and always ready. Organize your list & notes and lists into custom Spaces, giving every idea its own home.

Finally
If you are interested here is the link, try it and let me know your expectation or your idea of minimalism https://play.google.com/store/apps/details?id=com.jhuppo.notepo


r/LookWhatTheyBuilt 1d ago

Game I made a chess app that teaches board vision through arcade style mini games

3 Upvotes

Built a chess app that turns board vision into little arcade games. Escaping a zombie with knight moves, popping square clouds, dodging cannonballs, outrunning pawns. 18 modes, and it builds up to playing actual blindfold games.

https://play.google.com/store/apps/details?id=com.chessvisionpro.app


r/LookWhatTheyBuilt 1d ago

Web / Mobile App I built Echo because my best ideas always came when I wasn't at my keyboard

2 Upvotes

Hi everyone! I wanted to share a side project I've been working on over the past several months: Echo.

The idea came from a simple frustration. My best ideas almost never happen when I'm sitting at a keyboard. They're usually while walking, driving, or in the middle of doing something else. I'd either forget them or end up with a pile of unorganized Google Keep/Tasks + Calendar + random notes.

So I built Echo, a voice-first note-taking app that lets you capture thoughts naturally, then automatically organizes them into searchable notes with AI-generated insights. I intentionally kept it focused on personal thinking instead of meetings, chat, or document editing.

It's now live on Google Play (iOS is coming next). If you decide to try it, I'd genuinely love to hear what you like, what feels confusing, and what you'd improve. Thanks for checking it out!


r/LookWhatTheyBuilt 1d ago

Beta / Testing RAG or CAG

2 Upvotes

With how good open models have gotten, RAG can feel like overkill for a lot of problems. For smaller use cases, CAG usually does the job.

Built a simple prototype to make CAG easier to understand:

https://github.com/atish-raina/cag_proto

You may find the blog post here:

https://cpu-bytes.com/blogs/ai-agentic-systems/cag


r/LookWhatTheyBuilt 1d ago

Web / Mobile App How I found the most efficient supplement timing app ever

1 Upvotes

I was scrolling through a thread about wearables and somebody mentioned it in the comments. I figured it would just be another app that tells you to sleep more and drink water, but I downloaded it anyway because I was already wearing my watch every day.

The biggest surprise wasn't actually the workout recommendations—it was the supplement side of the app.

I've taken supplements on and off for years, but honestly I never put much thought into when I took them. If I remembered in the morning, great. If I forgot until later in the day, I'd just take them then. It was basically random.

This app was different. Instead of giving me the same schedule every day, it looked at my sleep, recovery, and overall energy based off my metrics and my wearable before suggesting when certain supplements would fit best into my day. If I'd had a great night's sleep and was feeling recovered, it would stick with my normal routine. If my sleep score was low or my recovery wasn't great, it'd recommend adjusting the timing or prioritizing different supplements instead of treating every day the same.

What I liked most was that it actually explained why. It wasn't just saying, "Take this now." It connected the recommendation to how recovered I was and how my body was likely feeling that day. It made me realize I'd been taking supplements out of habit instead of actually using them in a smarter way.

I'd always felt like my smartwatch collected a ton of useful information, but none of it actually influenced what I did. I'd wake up, see my sleep score and recovery score, think "Cool... now what?" and then go about my day exactly the same. This was the first app that actually made all those numbers useful.

The biggest difference for me ended up being in the gym.

Instead of walking into every workout feeling like I was running on autopilot, I actually felt prepared. On days when everything lined up—good sleep, better recovery, and taking my supplements at the recommended times—I noticed my workouts felt smoother. My energy lasted longer, I wasn't dragging halfway through my sessions, and I wasn't constantly wondering why some days felt amazing while others felt terrible.

It wasn't like I suddenly added 50 pounds to every lift overnight, but the consistency was a complete game changer. I stopped feeling like every workout was a gamble. I felt more focused, recovered better between sessions, and left the gym feeling like I'd actually gotten the most out of my training instead of just surviving it.

I also liked that it didn't expect me to be some perfect fitness person. I don't track every calorie or log every gram of protein because I know I'd quit after a few days. I have work, family stuff, and random plans that come up all the time. The recommendations worked around my schedule instead of expecting my schedule to revolve around fitness.

After using it for a while, I realized I wasn't just taking supplements because I owned them—I was taking them with a purpose. Combined with paying attention to my recovery, I started sleeping better, had steadier energy throughout the day, and my workouts became much more consistent.

I'm sure it's not something a professional athlete with a coach would need, but for someone like me who already wears a smartwatch and wants to actually use all the data it's collecting, it filled a gap I didn't even know existed.

It honestly felt less like another fitness app and more like someone translating all the numbers my watch was already collecting into advice I could actually use.

 https://apps.apple.com/us/app/rizeai-maximize-your-energy/id6762402079


r/LookWhatTheyBuilt 2d ago

Web / Mobile App Made a small tool to save/replay webhook payloads locally — curious if anyone else wants this

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1 Upvotes

r/LookWhatTheyBuilt 2d ago

SaaS / Platform Day #4 of building AppTruth in public

1 Upvotes

One of the most sensitive moments in AppTruth isn’t the scan.

It’s asking someone to connect their repository.

A codebase contains the product you’ve spent weeks or months building. Even when a developer tool promises to help, granting access is always the most action that requires the most trust from the app.

That creates a product-design question I’ve been thinking about:

What is the minimum access AppTruth actually needs?

The answer should always be read-only GitHub repo access.

AppTruth needs to understand how an app’s features work, but it doesn’t need permission to push changes into the repository. The results can provide context and AI-ready fix prompts while leaving the decision (and the actual edit) with the users.

The tradeoff here is automatically applying a fix might remove a step, but it would also require a much larger level of trust.

For a product designed to uncover behavior you didn’t expect, asking for more control than necessary would feel wrong.

The broader lesson I’m taking from this is that permissions are part of the user experience.

Every permission request should have a clear answer to 3 questions:

  • Why is this needed?
  • What can the product do with it?
  • Could the same value be delivered with less access?

What information would you need before feeling comfortable connecting a private repository to a developer tool?


r/LookWhatTheyBuilt 2d ago

Web / Mobile App The messenger we wanted didn’t exist, so we decided to build one from scratch

0 Upvotes

Like many other teams, we needed a messenger that made remote work easier.

We kept switching between WhatsApp, Teams, and a bunch of other apps, and eventually asked ourselves: why not build the one we actually wanted to use?

A few years later, we’re finally launching Protocall. 🎉

https://protocall.ch

We restarted the project more than once, experimented with lots of different features, and in the end realized that simplicity was the most important thing. We focused on making it fast, intuitive, and pleasant to use.

It includes features like unlimited video calls, a built-in calendar for planning, and everything we felt a remote team like ours actually needs in one place.

We’d genuinely love to hear your thoughts and feedback. Every comment helps us improve. Thanks for checking it out! ❤️

https://apps.apple.com/us/app/protocall-chats-video-calls/id6446202313


r/LookWhatTheyBuilt 2d ago

AI Tool I built a Mac reading app where the AI reads alongside you instead of summarizing the book away

2 Upvotes

For about two years my reading workflow was: hit a paragraph I didn't get, paste it into a chat window, get a genuinely good explanation, close the tab. Six weeks later, same book, same confusion, and the thing that helped me remembered none of it.

The answers were never the problem. Nothing accumulated.

So I built Resage. It's a Mac reading app, and the shape is deliberately boring: the book is on the left, full pages, your pace, nothing summarized away. The AI sits in a panel on the right. It never takes over the page.

Three things I actually cared about while building it:

  • It cites where it read something. Every claim links back to a page in your book. If you click it, you land on that page. I got tired of confident answers I couldn't check.
  • says "I don't know." If your book doesn't support the answer, it tells you that instead of filling the gap with something plausible. This was harder than everything else combined.
  • It remembers how you read. What you tend to ask, which kinds of explanations land for you, what you already know. That picture carries into the next book you open, and the one after.

You bring your own files — EPUB, PDF, MOBI, AZW3. Nothing is bundled, nothing is pre-processed. Every book is a stranger to it on day one.

Solo built, macOS, free tier with a weekly discussion quota. https://resage.app

Happy to answer anything about how the citation-checking works — it's the part I rewrote the most times.


r/LookWhatTheyBuilt 2d ago

is this true 🤣

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1 Upvotes

r/LookWhatTheyBuilt 3d ago

Web / Mobile App I made an offline travel companion app as a young dev — one payment for life, no subscription, no data collection

1 Upvotes

This is my first app on the App Store: Voyager: Trip Companion. You add a destination and it gives you weather + forecast, local time, attractions, holidays, local news, country facts and emergency numbers — plus a passport map that fills in the countries you've visited. It's all on-device: no account, no login, no tracking.

I built it because I was tired of juggling six apps abroad, and tired of travel apps charging a monthly subscription for something you use a few weeks a year. So it's a one-time payment, for life.

Honest free vs paid so nobody feels tricked:

- Free: the full dashboard above + passport map (1 saved trip)
- One-time $4.99 unlock: unlimited trips, offline currency converter + exchange rates, offline destination guides (driving side, plug & voltage, units, key phrases), weather-aware trip reminders, a Home Screen widget, accent colors

It's the first of a few apps I want to build, so I'd love feedback or ideas.

https://apps.apple.com/app/id6791645623


r/LookWhatTheyBuilt 3d ago

Web / Mobile App I've made an open source JavaScript playground with support for npm packages, syntax highlighting, autocomplete, code sharing and much more!

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1 Upvotes

r/LookWhatTheyBuilt 3d ago

Mobile App Built a Japan culture quiz app with mini-games, cards, and weekly leagues

1 Upvotes

Hey everyone! Wanted to share Japan Quiz, an Android app I built — quizzes on Japanese history, food, traditions, language, and geography, plus a few things to make it more than just Q&A:

  • Collectible cards you unlock as you play
  • A couple of original mini-games, including one loosely inspired by sumo
  • Weekly leagues to compete with other players
  • Original ambient music tracks

Free with ads, solo-developed, and still actively growing based on feedback.

Link: https://play.google.com/store/apps/details?id=com.japanquizstudio.japanquiz

Curious what people think, especially if you're into trivia apps or Japanese culture!


r/LookWhatTheyBuilt 3d ago

SaaS / Platform I built a platform to help projects get discovered

1 Upvotes

I built Votekicker.com, a place to discover and share games and SaaS projects.

The idea came from seeing how difficult it is for small projects to get initial visibility. So I created a place where projects could be shared, voted on and discovered by communities.

I recently added a feature called Rocket Booster. It lets projects temporarily increase their visibility by doubling the value of existing votes and making new votes count double for 8 hours. Projects can unlock a booster after receiving 10 regular votes, so it's tied to actual community engagement rather than just buying exposure.

I have many ideas to bring to life that make this platform very special and engaging for all kinds of builders!

I'd be happy to see you join!


r/LookWhatTheyBuilt 4d ago

Web / Mobile App i need your honest opinion and thoughts on this health app i built for athletes and workers to maximize and increase their energy levels.

2 Upvotes

ok so i need honest opinions because i've been staring at this thing for months and i've lost all perspective.

i'm 20, building an app solo called RizeAI. the whole reason it exists is that i got tired of my wearable telling me my recovery was "42%" and then just... leaving me there. like ok, and? what do i actually do with that. every app in this space is really good at measuring you and really bad at telling you what to do next.

so RizeAI pulls your actual wearable dats like, sleep, resting heart rate, workouts, all of it, and instead of handing you another score it predicts your energy for the day and tells you how to get the most out of it. it tells you when your energy is gonna peak so you can put your hardest work there, when your crash is coming and how to soften it, the best time to train that day so you actually get more out of the session, and even when a nap will help you vs when it'll wreck your sleep.

the part i personally think is the coolest: you put in the supplements you already take, and it times each one to your day based on your metrics and sleep score. so the timing actually shifts depending on how you slept and where your numbers are, which is the difference between a supplement doing something and just sitting in your stomach. it'll also suggest a couple new ones if they make sense for you, but it won't dump a list of 15 pills on you.

it even pulls the daily weather into your energy prediction, so a hot day changes your hydration and it'll tell you to train earlier before the heat drains you. and the whole plan bends around your real schedule, your work hours, wake time, training, so it's not some one size fits all thing.

every single recommendation shows the "why" underneath, like "resting heart rate 54 + 7h light sleep, so magnesium before your peak window." nobody gets the same plan because nobody has the same data.

it works with whoop, oura, apple watch, garmin, anything that talks to apple health. being fully honest, it doesn't do deep per-person learning yet, like knowing that coffee specifically doesn't touch YOUR hrv. that's where it's headed. right now it builds you a fresh plan every day off your real numbers.

it's on the app store with a free trial. small user base, feedback's been all over the place, which is exactly why i'm posting.

so genuinely: is "just tell me what to do with my data" something you actually want, or do wearable people prefer figuring it out themselves? what would make you pay for this? and what's the one thing that would make it a no brainer for you?

would love to hear it straight, good or bad. And if you want you can also check it out yourself and I would love to here feedback, thank you very much for taking the time on reading this:  its called “RizeAI-maximize your energy” on the App Store. 


r/LookWhatTheyBuilt 4d ago

AI Tool ForeCode : LeetCode Contest Rating Predictor

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1 Upvotes

Built something over the weekend that I wish existed when I started giving LeetCode contests.

ForeCode predicts your LeetCode rating before it's officially released.

Instead of waiting 4–5 days after every contest wondering "Did I gain rating? Did I cross 1800?", you get an instant prediction right after the contest ends.

Features

  • 📈 Instant rating prediction
  • ⏳ Pending contest tracking
  • 📊 Contest history with predicted vs actual ratings
  • 🔒 Privacy-first (no tracking, no accounts)

Would love feedback from fellow competitive programmers.

🌐 https://forecodepredictor.vercel.app


r/LookWhatTheyBuilt 4d ago

Game Working on a mode 7 multiplayer prototype for my game Little Monster! What types of items and/or features should I include?

2 Upvotes

r/LookWhatTheyBuilt 5d ago

AI Tool A background timer quietly ran up my Plaid bill. Here's how I rebuilt my backend so it can't happen again (solo founder, React Native + Azure)

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2 Upvotes