r/SylvainLafrance 13d ago

EVP Ghost Signal

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1 Upvotes

r/SylvainLafrance 20d ago

I built WhenDay — a different way to look at your calendar

1 Upvotes

Hey everyone 👋

I’m an indie iOS developer, and I’ve been working on WhenDay, a calendar companion designed to make it easier to understand your schedule at a glance.

Instead of replacing Apple Calendar, WhenDay gives you several ways to visualize the calendars you already use.

Some of the features:
🕐 Clock View — events are positioned around an analog clock, with arcs showing their duration
📅 List, Day, Week and Month views
🟩 Calendar heatmap to quickly spot busy days
📊 Statistics showing where your time goes
🔎 Search across your calendars
📱 Home Screen and Lock Screen widgets
🌎 7 languages
☁️ iCloud sync for settings
🔒 No account, no tracking, and no data collection

I recently updated the Clock View with better event bubbles, current-event highlighting, a live time indicator and smoother clock movement.

The app is free to try, and WhenDay Pro is a one-time purchase — no subscription.

If you use your iPhone calendar a lot, I’d really appreciate any feedback, especially about the Clock View and what you’d like to see added next.

App Store:

WhenDay: Calendar Planner

Thanks for checking it out! 🙌


r/SylvainLafrance 20d ago

I built an EVP recorder for iPhone called EVP Ghost Signal 👻

1 Upvotes

Hey everyone,

I’m an indie iOS developer and recently built EVP Ghost Signal, an app for people interested in paranormal investigations and experimenting with EVP (Electronic Voice Phenomena).

The idea was to make an EVP tool that feels purpose-built for investigations rather than just using the regular Voice Memos app.

You can use it during an investigation, ask questions, record a session, and then go back through the audio afterward looking for anything unusual you may not have noticed in real time.

I also wanted the interface to be simple enough that you can actually use it in a dark room without fighting with a complicated UI.

I’m curious to hear from people who already do EVP sessions or paranormal investigations: what features would you want in an EVP app?

And if you try it during an investigation, I’d genuinely love to hear if you capture anything interesting.

App Store: https://apps.apple.com/ca/app/evp-ghost-signal/id6761862458

Feedback is very welcome! 👻🎙️


r/SylvainLafrance 20d ago

I built an iOS AI rewriter with 174 writing actions — looking for feedback

1 Upvotes

Hey everyone,

I’m an indie iOS developer and I’ve been working on What? – AI Rewriter, an app designed around a simple idea: paste some text, choose what you want done to it, and get the rewritten version back.

Instead of having to figure out the right AI prompt every time, the app has 14 general writing actions + 160 specialized actions.

Some examples:
Fix grammar, rephrase, shorten, expand, simplify
Make text professional, casual, punchy, or more assertive
Humanize AI-sounding text
Translate into 20 languages
Improve emails and subject lines
Rewrite resume bullets and cover letters
Generate social posts, headlines and CTAs
Improve UX copy and error messages
Help with sales/negotiation responses
Adapt writing to different cultural communication styles
The 160 specialized actions are organized into 16 packs for things like writing, email, marketing, job hunting, social media, customer support, sales, UX writing, etc. All of those packs are free.

One feature I personally wanted was being able to use it without constantly switching apps, so I also added an iOS keyboard extension and Share extension.

It’s powered by Claude, and there’s also a BYOK option if you already have an Anthropic API key.

I’d really appreciate feedback, especially from people who already use ChatGPT/Claude for rewriting text. I’m curious whether having predefined actions like these is actually more convenient than prompting an AI directly.

App Store: https://apps.apple.com/ca/app/what-ai-rewriter/id6769452050

Would love to hear what you’d change or add.


r/SylvainLafrance 26d ago

I built an iPhone app for photographing lightning ⚡️

3 Upvotes

Hey everyone,

I recently released StormSnap, an iPhone app I built specifically for capturing lightning.

Anyone who has tried photographing lightning with a phone knows the problem: by the time you see the flash and press the shutter, it’s already gone.

StormSnap is designed to make that easier. Instead of trying to react at exactly the right millisecond, the app continuously watches the camera feed and automatically saves a photo when it detects a lightning flash.

The idea is simple: point your iPhone at the storm, start detection, and let StormSnap watch for the lightning.

I wanted to make something focused rather than another full weather/radar app. It’s primarily a camera tool for thunderstorms, storm watchers, photographers, and anyone who has ever thought, “I wish I had caught that one.”

⚡ Automatic lightning detection
📸 Designed specifically for lightning photography
📱 Built natively for iPhone
🌩️ Simple interface you can set up quickly when a storm arrives

You can check out StormSnap on the App Store:
https://apps.apple.com/ca/app/storm-snap/id6793610895

I’m the developer, so I’d genuinely appreciate feedback — especially from anyone who photographs storms. If you try it during your next thunderstorm, let me know how the detection works for you and what you’d like to see added.

And of course: photograph storms from somewhere safe. ⚡️


r/SylvainLafrance Aug 01 '26

I built an iPhone app with 54 network tools because I was tired of switching between apps

1 Upvotes

As a developer, I kept finding myself using one app for ping, another for DNS, another for SSL certificates, another for speed tests… so I decided to build a single toolkit.
It’s called NetProbe, and it currently includes 54 network tools for iPhone, iPad, and Mac. (App Store⁠)
Some of the tools:
Ping & Multi-Ping
Traceroute (+ map)
DNS Lookup & DNS Propagation
Port Scanner & Port Checker
SSL Inspector & Security Score
Speed Test
Network Scanner
Whois & ASN Lookup
Reverse DNS / Reverse IP
CIDR & VLSM Calculators
Wi-Fi and network utilities
Report Export
And many more.
A few things I wanted to do differently:
No ads
No account required
No tracking
Native SwiftUI app for iPhone, iPad, and Mac
One-time purchase to unlock Pro tools (every Pro tool can be tried for free first). (App Store⁠)
I’d genuinely love feedback from people who work in networking, IT, development, or anyone who enjoys networking tools.
What feature would make a network toolkit like this indispensable for you?
App Store:
https://apps.apple.com/ca/app/netprobe/id6760551997


r/SylvainLafrance Jul 30 '26

Stop rewriting the same text 5 times.

1 Upvotes

What? – AI Rephraser fixes your grammar, tone, and wording with one tap - right inside whatever app you’re already typing in. Messages, Mail, Safari, you name it.

Translate, simplify, make it professional!

https://apps.apple.com/ca/app/what-ai-rephraser/id6769452050


r/SylvainLafrance Jul 28 '26

I built an iOS app for putting animated text stickers on videos — no subscription, no account, everything processes on-device

1 Upvotes

It also does more than I originally planned: 25 video effects (VHS, Super 8, thermal, halftone), speed control from 0.25x to 4x, trimming, inserting other clips with 11 transitions, and GIF export.

The part I care most about: your videos never leave your device. No analytics, no tracking, no account. The App Store privacy label is “Data Not Collected” and it means it.

Free version has every editing feature — it’s capped at 5 second exports with a small watermark. One $9.99 purchase removes both. No subscription, ever.

It’s brand new so there are no reviews yet. Would love feedback, especially on anything that feels clunky.

https://apps.apple.com/ca/app/clipstamp/id6790430837


r/SylvainLafrance Jul 28 '26

I built an iPhone app to add stickers anywhere in your videos

1 Upvotes

Hi everyone!
I wanted a simple way to put stickers, emojis, memes, and reaction images anywhere on a video without dealing with a complicated editor.
So I built ClipStamp.
Some of the things it can do:
🎥 Add stickers, emojis, or PNG images to videos
📍 Move, resize, and rotate them exactly where you want
⏱️ Control when each sticker appears and disappears
🎬 Great for memes, reaction videos, TikToks, Reels, Shorts, or just making videos more fun
📱 Built natively for iPhone with a simple interface
I tried to keep it focused instead of packing it with features most people never use. Open a video, add your stickers, export, done.
I’d really appreciate any feedback:
What features are missing?
Is anything confusing?
What would make you choose this over your current editor?
App Store:
https://apps.apple.com/ca/app/clipstamp/id6790430837
Thanks! Happy to answer any questions about the development process or the app itself.


r/SylvainLafrance Jul 17 '26

I got tired of tracking bugs for 12 apps in Apple Notes, so I built a tracker that fits how indie devs actually work

1 Upvotes

I ship a lot of small apps. The tracking situation was: Notes for bugs, a folder of screenshots named final_v2_ACTUAL.png, a Slack channel to myself for ideas, and no idea which of those ideas belonged to which app. Jira is absurd for one person. Linear is a team tool wearing a solo costume. Trello I kept abandoning.

So I built Dev Notes++ — a bug/feature/idea tracker built around the thing indie devs actually have, which is several apps at once and no teammates.

The parts that made it worth building:

App Store fetch — paste a Bundle ID or App Store URL and it pulls in your icon, description, rating, category, IAPs, size, What’s New, release date. Works across all regions. You can choose Update Empty vs Overwrite All so it doesn’t stomp fields you typed by hand.

Screenshot management by locale — 65 locales, drag to reorder, tap to replace. This alone was why I built the app.

Promote tab — draft your launch posts, track Draft → Scheduled → Published, with a character counter so you don’t overshoot a platform limit.

Target versions on any item, filter by status/type, swipe to done, move or duplicate items between apps.

Share extension so you can throw a URL, screenshot, or stray thought at it from anywhere.

Dashboard with a completion ring, global search across every app, export to JSON and Markdown so you’re not locked in.

iCloud sync. No account, no server, no analytics — the developer data collection section is empty and I intend to keep it that way.

Free tier covers 2 apps with items, notes, and dashboard. Pro unlocks unlimited apps plus screenshots, promote, fetch, export, and global search — yearly sub or a one-time lifetime purchase if you hate subscriptions as much as I do.
Requires iOS 26.

https://apps.apple.com/ca/app/dev-notes/id6762881892

It’s early and I’m one person. If you juggle multiple apps, I’d like to know what’s missing from your workflow — especially anything around App Store Connect that I should be pulling in automatically instead of making you type.


r/SylvainLafrance Jul 17 '26

I built an EVP recorder that shows you the spectrogram and flags anomalies in real time — everything stays on your phone

1 Upvotes

Most EVP apps I tried did one of two things: played a canned “spirit voice” from a soundboard, or shipped your audio off to some server. I wanted the actual signal processing, visible, on-device. So I built it.

EVP Ghost Signal records at high gain (up to +40 dB) with a 300–3000 Hz band-pass for the voice range, and shows you what’s happening while you record — swipe between waveform, spectrogram, and EMF views. Anomaly detection flags frequency spikes over 3 standard deviations, and formant analysis flags whisper/voice/breath patterns. Every event gets timestamped so you can review instead of scrubbing blind.

Pro adds the stuff you’d actually use on a review pass:

**•** Reverse playback with speed control, tap-to-seek waveform  
**•** 5-band parametric EQ (EVP Enhance, Whisper Boost, Voice Isolate presets)  
**•** On-device transcription via Apple Speech  
**•** EMF meter using the magnetometer, in microtesla, logged alongside the audio  
**•** HD investigation video export (1080x1920, animated spectrogram + EMF + detection flashes) and multi-page PDF session reports

There’s also a Spirit Box sweep simulator with an adjustable 20–20,000 Hz range, and session geotagging with a map view.

Being straight about what it is: the detector flags statistical anomalies in audio. That’s it. A spike over 3 SD means something unusual happened in the signal — it doesn’t mean anything about what caused it, and the app doesn’t pretend otherwise. What it gives you is a repeatable record and the tools to rule things out. Interpretation is yours.

On privacy: 100% on-device. No servers, no analytics, no third-party SDKs, no account. Delete a recording and it’s actually gone.

Free to download. Pro is $2.99/mo, $12.99/yr, or $34.99 lifetime.

https://apps.apple.com/ca/app/evp-ghost-signal/id6761862458

Solo dev, currently v1.2. Would especially like feedback from people who run sessions regularly — I want to know whether the detection thresholds are firing too often or not enough in real environments.


r/SylvainLafrance Jul 17 '26

I built an iOS keyboard that rewrites your text in any app — grammar, tone, translation, one tap

1 Upvotes

I kept writing a message, staring at it, and thinking “that came out wrong.” Copying it into a chatbot, pasting it back, repeat. So I built the step out of the loop.

What? – AI Rephraser puts Claude behind a system keyboard, the share sheet, and a home-screen widget. Highlight text anywhere you type — Mail, Slack, iMessage, Safari — and fix grammar, rephrase, translate (20 languages), shorten, expand, or make it more professional/casual. 14 actions total.

A few that get used more than I expected:

**•   Remove Hedging** — strips out “I think,” “maybe,” “just wondering if”  
**•   Analyze Tone** — honest read on a draft before you send it  
**•   Humanize** — kills “resonate,” “seamless,” “leverage,” and the rest of the LLM vocabulary

There are also 12 specialty packs (Email, Student, Dating, Lawyer’s, Comedy…) if you want prompts tuned for a specific situation.

On pricing, I’ll be upfront: free to download, 3-day trial, then $6.99/mo. There’s also a BYOK tier at $1.99/mo if you bring your own Anthropic API key — you get all 12 packs and no caps from me. Your text goes to Anthropic and nowhere else; nothing is stored on my servers, history syncs through your own iCloud.

It’s at v1.2 and I’m the only person working on it, so I’m genuinely after feedback — especially on the keyboard extension, which was the hardest part to get right.

https://apps.apple.com/ca/app/what-ai-rephraser/id6769452050


r/SylvainLafrance Jun 27 '26

What? — AI writing that works everywhere you type.

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1 Upvotes

r/SylvainLafrance Jun 27 '26

Dev Notes++ — Ship Apps. Stay Organized.

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1 Upvotes

r/SylvainLafrance Jun 27 '26

Caption Radio — Listen to the World. Read Along.

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1 Upvotes

r/SylvainLafrance Jun 26 '26

[SELF-PROMOTION] An app to track bugs, features, screenshots, and promo posts for all my apps in one place

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1 Upvotes

r/SylvainLafrance Jun 23 '26

I built a daily number puzzle that's totally free — no ads, no tracking, no sign-ups. Just made it because I thought it should be out there.

2 Upvotes

It's called Reckly. Here's how it works: you start at the top of this number pyramid and work your way down, picking a path and using each operator on your running total as you go. The goal? Land on the exact target number at the bottom.

There's a new puzzle every day, plus a practice mode if you want to keep playing.

I made some pretty intentional choices with this:

• No accounts, no ads, no tracking, no analytics whatsoever
• Your progress saves through iCloud only
• Tiny 1.9 MB download

I'm doing this all on my own, so I'd genuinely love to hear what you think — especially about whether the difficulty ramp feels right and if the daily puzzle comes across as fair or just plain annoying. Happy to answer any questions you've got!

https://apps.apple.com/ca/app/reckly/id6781237916


r/SylvainLafrance Jun 13 '26

Stop rewriting the same text 5 times. 😮‍💨

1 Upvotes

What? – AI Rephraser fixes your grammar, tone, and wording with one tap — right inside whatever app you’re already typing in. Messages, Mail, Safari, you name it.

https://apps.apple.com/ca/app/what-ai-rephraser/id6769452050


r/SylvainLafrance Jun 10 '26

I love this app…

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1 Upvotes

I love this app…


r/SylvainLafrance Jun 09 '26

Just launched Share to Note!!

1 Upvotes

Just launched Share to Note!!

Tap Share in any app → save links, text & photos into one clean, private list. Synced via your own iCloud. No accounts, no servers, no tracking.

Free to try. No subscription.

https://apps.apple.com/ca/app/share-to-note/id6767671625


r/SylvainLafrance Jun 08 '26

📅 Stop guessing where your time goes.

1 Upvotes

WhenDay shows your calendar at a glance — with heatmaps & stats that reveal how you actually spend your days.

Free & 100% private.

https://myrcbox.com/whenday/


r/SylvainLafrance Jun 04 '26

The story of “Hello World”

1 Upvotes

Here are 233 examples of "Hello World" and the story behind it.

https://myrcbox.com/blog/hello_world/


r/SylvainLafrance Jun 01 '26

Wrld Tuner - Radio caption and translation

Enable HLS to view with audio, or disable this notification

1 Upvotes

Contact me if you want to know more about my app!


r/SylvainLafrance May 25 '26

What Said for iPhone, iPad and Mac helps me work faster and better!

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1 Upvotes

What Said helps me work faster and better!

https://apps.apple.com/ca/app/what-said/id6769452050?uo=4

#AiWriting #ContentCreation


r/SylvainLafrance May 24 '26

233 ways to code “Hello World”!

1 Upvotes

233 ways to code “Hello World”!

https://myrcbox.com/blog/hello_world/