r/appledevelopers

so i had this dumb idea, what if your phone made a sound when you slap it. like physically smack it.

im not a developer btw. i vibecoded the whole thing with cursor and claude. literally just described what i wanted and kept iterating until it worked. the slap detection uses the accelerometer and gyroscope apparently but if you ask me to explain the code line by line i will stare at you blankly lol

the hardest part was prompting correctly tbh. vague prompts gave me terrible detection that triggered from everything. had to get really specific like “detect a sharp acceleration spike followed by rotational change within 100ms and add a cooldown so it doesnt fire multiple times” and then it actually started working

biggest lesson: vibecoding sensor based stuff sucks bc you cant test it in the simulator. had to build to device every single time to see if the slap detection felt right. so many deploy cycles just to adjust one threshold value

anyway the app is called SlapiPhone. its live and people seem to like it which is wild to me

https://apps.apple.com/us/app/slapiphone/id6761282903

Lost my job 3 months ago and after many many weeks my apps have finally made it to the App Store!

Looking to grow and improve them but for that I need feedback so hoping if anyone out there can give them a download and tell me what’s bad, broken, or great about them. I’ll put my website links below and u can download from there for IOS or android. DM me whatever username and or email u used to sign up and I’ll give u pro access for 3 months in exchange for feedback on how to make the apps better!

ReelChef:

https://www.reelchef.app

Aura:

https://www.wearaura.app

I was working on a game project and had to deal with thousands of 3D assets (FBX, GLB, OBJ…).

The problem: macOS only QuickLooks USDZ files natively.

For everything else, I had to open a full 3D engine just to check what a file looked like.

So I built a lightweight Mac app that adds real QuickLook support for all common 3D formats directly in Finder, with instant preview, materials, textures and animations. It also has a folder browser with 3D thumbnails and a favorites system to bookmark assets.

Curious to hear if other devs here have run into the same pain point with 3D workflows on Mac.

You can remember what a place looked like.

But can you remember how it felt?

I built an iOS app that lets you leave 20-second voice memories anywhere in the world, tied to exact GPS coordinates.

It analyzes the emotion in your voice, turning places into a personal emotional map.

Come back later, and you’ll hear yourself from the past.

https://apps.apple.com/it/app/sonorae/id6760564492

No, not the arm gesture but smoking marijuana concentrates! It’s a timer utility app that I personally use daily and have seen interest from others at dispensaries! My goal was to make something very UI friendly so anyone can pick up and use it.

The most difficult part was to ensure Apple that it isn’t an app that promotes smoking but merely a timer utility app. After multiple rejections, it finally got released to the App Store 🙌🏽

Feel free to check it out: https://getdabby.app

Learnings: Tired of manual logging of reps/durations. Most fitness apps in this space either need a subscription to do anything useful, require sign-in just to get started, or send your workout data to a server. This one does none of that.

Platform - iOS 18+

Tech Stack - SwiftUI, Mediapipe Vision Framework, Apple Vision Framework

Development Challenge - The app shows a live range-of-motion (ROM) bar on every workout so users see where they are in each rep and when they’ve crossed the “count” line. The main challenge was keeping that bar in sync with the rep-count logic and with the rest of the UI.

Pose data (e.g. elbow or knee angle) comes from the vision pipeline and has to map to a single progress value (0-1) that drives both the bar position & the thresholds. If the bar used a different scale or direction than the logic that decides “rep counted,” the yellow line would sit in the wrong place and feel broken. I fixed that by sharing one mapping function (angle -> progress) between the ViewModel (for rep counting) and the SwiftUI ROM bar view (for drawing the fill and threshold lines), and by defining the threshold angles in one place so the yellow/orange markers are always drawn at the same progress values used for counting.

There’s also layout alignment: the bar is overlaid on the camera with a bottom status card (“Get ready” / “Active” / “Get in position”). I used a fixed bar height and bottom padding so the bar stays above the status card and doesn’t get covered, and kept the same leading padding across workouts so the bar feels consistent. Smoothing the pose stream (e.g. lightweight smoothing in the ViewModel) before feeding the bar reduced jitter so the indicator doesn’t fight the rep logic. Overall, treating “one source of truth for progress + shared layout constants” as the rule made the ROM bar feel reliable and predictable.

AI Disclosure - self-built

Feedbacks - Share your overall feedback if you find it helpful for your use case.

What you get:

- Gamified Dynamic ROM (Range Of Motion) Bar for every workouts.
- Support for tripod/shelf/on-ground positioning of the device (as long as subject is fully visible in the front camera, for smooth workouts experience)
- Privacy Modes (Blur My Face, Focus On Me)
- All existing 10 workouts. (More coming soon..)
- Widgets: Small, Medium, Large (Different data/insights)
- Metrics
- Activity Insights
- Workout Calendar
- On-device Notifications

- Institution Mode (Gyms, Studios, Schools, etc) (For commercial businesses - Premium only) includes:
- Touch-less Kiosk Mode, Live Leaderboards & Stats, XP & Levels, Challenges (Custom), Milestones That Hit Different.

Pricing (includes 7-day free trial):

(Note: All CORE features are FREE for all, forever in "Continue without Signing in" mode.)

- Lifetime - $49.99 (Pay once, yours forever)
- Monthly - $4.99
- Yearly - $29.99 (Save 50% vs Monthly)

Anyone who is already into fitness or just getting started, this will make your workout experience more fun & exciting.

This subreddit has been really helpful, you guys!

It took about 3 weeks of back and forth with app review but my app GrantHub finally got approved yesterday                                        

It's a grant budget management tool for researchers — if you've ever had to manage research funding you know it's a mess of spreadsheets and overhead calculations. basically built this because i was tired of doing it myself in excel                                                    

The review process was... an experience. first rejection was because NSPersistentCloudKitContainer silently rejects uniquenessConstraints even  when cloudkit sync is disabled — app just crashed on every launch for the reviewer. second time they couldn't reopen the window after closing it (forgot applicationShouldTerminateAfterLastWindowClosed). third time a button was getting clipped off screen on the reviewer's 14-inch macbook pro                                                                                                                                    

each time it was something i never would have caught on my own setup. honestly the review process made the app better even though it was painful                                                                                                                                        

anyway if anyone here manages research grants or knows someone in academia who does — would love feedback: https://apps.apple.com/tr/app/granthub/id6760590526?mt=12

Built an app to track MRR/ARR from the App Store, Google Play, and Stripe in one place. You can also just use it for expense tracking. Just got the iOS app approved and decided to open-source the backend so other devs can self-host it.

Runs entirely on Cloudflare's free tier (Workers + D1 + SQLite). One-command deploy, no server needed. Also does AI receipt scanning if you want expense tracking alongside revenue.

GitHub: https://github.com/WeaveHubHQ/weaveledger-oss

iOS App: https://apps.apple.com/us/app/weaveledger/id6760322757

Website: https://www.weavehub.app/weaveledger

Hey everyone,

Meet Fog, a fun little side project I’ve been working on.

I struggle with organizing my notes, creating folders, figuring out what goes where, selecting things manually… the list goes on. So I built a simple app that aims to solve this with 4 core features:

- Auto-naming notes

- Auto grouping into clouds

- Auto cloud grouping

- Ask anything about your notes

Built with SwiftUI + SwiftData, and powered by Apple’s on-device Foundations Model **(requires a device with Apple Intelligence)**. The AI runs entirely on your device — no third-party servers, no data harvesting. Your notes sync across your devices via iCloud, so they stay in your Apple ecosystem and nowhere else (works offline too).

Available for free on the App Store! Let me know the good, bad, and ugly. I’m all ears.

https://apps.apple.com/us/app/fog/id6760272134

I built an iOS app where you can record short voice memories and attach them to exact locations.

When you come back to that place, the app reminds you and you can listen to what you recorded there.

It also analyzes the emotion in your voice to build a personal emotional map, and with the Pro version you get stats and insights over time.

https://apps.apple.com/it/app/sonorae/id6760564492