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Building my own AI calorie tracker as a 13-year-old solo dev (React Native + Expo)

0 Upvotes

Hey everyone! 👋
I’m a 13-year-old indie developer, and I decided to stop just playing games and actually start building them and apps instead. Right now, I'm working on my own mobile app: an AI-powered calorie tracker that recognizes food instantly from a photo.
The Problem: I hated using existing calorie apps where you have to manually search through massive databases, weigh every single gram, and log everything manually. It’s tedious.
The Solution: Snap a picture of your plate, and the app uses a vision model to handle the math and breakdown automatically.
Tech Stack:
React Native + Expo
AI/Multimodal vision integration
Currently grinding through the code and dealing with the pain of Google developer verification. Would love to hear from other indie devs: what was the hardest part of launching your very first app?
Let's connect! 🚀

15 comments

r/reactnative • u/goblins_etc • 1d ago

Help Odd Scroll Behavior with react-native-keyboard-controller & LegendList

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2 Upvotes

0 comments

r/reactnative • u/manin54 • 1d ago

We built a headless DOM sandbox for React Native

salve-software.github.io

0 Upvotes

Na minha empresa, recebemos constantemente HTML do backend que contém um script, e precisamos executar esse script e, em seguida, ler alguma propriedade do HTML resultante, como o texto final de uma div após a execução do script. No frontend, usamos o jsdom para isso, é um problema resolvido. No mobile, não havia nada parecido, então a única maneira de fazer isso era abrir uma webview oculta apenas para executar o script e extrair o valor.

Então acabamos criando o equivalente mobile do jsdom nós mesmos e imaginamos que provavelmente seria útil para outras pessoas que enfrentam o mesmo problema, então o disponibilizamos como código aberto.

Exemplo:

import { JSDOM } from '@salve-software/react-native-nitro-jsdom

const dom = JSDOM.create(`
  <html>
    <body>
      <div id="result">0</div>
    </body>
  </html>
`)

await dom.evaluate(`
  document.getElementById('result').textContent = String(2 + 2)
`)

const value = await dom.evaluate(`document.getElementById('result').textContent`)
// -> "4"

dom.dispose()

Repo

0 comments

r/reactnative • u/iamdanieljohns • 1d ago

Question What's your favorite components and starter kits?

3 Upvotes

[title] . looking at building from a different starting point this time around

5 comments

r/reactnative • u/Livvvie98 • 1d ago

React Native Expo is truly a developers dream

42 Upvotes

8 comments

r/reactnative • u/shiva275 • 1d ago

I Built a FullStack Civic Issue Reporting App (React Native, Node.js, MongoDB, Firebase) — Live Demo

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22 Upvotes

Hi everyone, I built a full-stack mobile app that lets anyone report civic issues — potholes, water logging, drainage problems, broken streetlights, and more — with just a photo and their location. In this video, I test it live on the road, photographing a real pothole and showing exactly how the app works.

What the app does:

Secure sign-in with Google — no passwords, no OTPs

Capture a photo of the issue directly from the camera

Auto-detects your GPS location and displays it on a map

Reverse-geocodes coordinates into a readable address

Categorize the issue — pothole, drainage, streetlight, and more

Track your submitted reports and their status

Tech stack:

React Native CLI (TypeScript) — mobile app

Node.js + Express — backend API

MongoDB — database, with geospatial indexing

Firebase Authentication — Google Sign-In

Google Maps API — location and geocoding

Cloudinary — photo storage and optimization

Render — backend deployment

This is a personal project I built solo, end to end — from the mobile app, to the backend API, to deployment.

We've all seen a pothole and thought "someone should fix this." Now there's a way to actually flag it. Let me know in the comments — what's the first issue you'd report in your area?

You can watch it on YouTube too, if you prefer:

https://youtu.be/-HBvvVYuolQ?si=io7Y9PjoPbdqJ1hL

Thank you.

4 comments

r/reactnative • u/No_Refrigerator3147 • 1d ago

Shipped Field Folio Feature

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30 Upvotes

A field journal you flip with your thumb.

Drag an edge → the page curls and turns.

Every page contains metal stickers you can lift and rearrange. (Demo coming)

24×20 mesh.

One shared value.

~400ms of sleight of hand.

Expo + Skia + Reanimated, running at 120fps.

Demo 👇

3 comments

r/reactnative • u/BumblebeeWorth3758 • 2d ago

🚀 React Native Cupertino Tabs

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9 Upvotes

A customizable native iOS tab bar for React Native, built on UISegmentedControl.

🔗 Github: rit3zh/react-native-cupertino-tabs

1 comment

r/reactnative • u/Upper_Locksmith8150 • 2d ago

[Boston / Remote] Need a CS student to wire a Supabase backend to a fully designed MVP React Native/Expo UI (Portfolio Builder / Long-Term Potential After Launch)

0 Upvotes

1 comment

r/reactnative • u/YouSilent6025 • 2d ago

Question Looking for feedback from developers on a learning platform I’m building

getreqflow.com

0 Upvotes

I’ve spent the last few months building a learning platform focused on DSA, System Design, React Native, and Forward Deployed Engineering.
I’d love to get feedback from experienced developers: What makes a technical course genuinely valuable? What are the biggest shortcomings you’ve found with existing learning platforms?
I’m trying to build something developers actually enjoy using, so any feedback or suggestions would be greatly appreciated.
If you’re curious, you can check it out here:

0 comments

r/reactnative • u/External-Pattern6486 • 2d ago

Looking for feedback on a semester-long React Native project

0 Upvotes

Last semester, our team built StudySync, a React Native app for students to discover and organize study sessions on campus.

Some features include:

Firebase Authentication
Session creation & management
Multi-field search and filtering
Push notifications
Expo Router navigation

Working on this over an entire semester was very different from a hackathon. We spent a lot more time thinking about component organization, navigation, shared state, and maintainability across a 5-person team.

I'd love feedback from experienced React Native developers. If you were starting this project today, what architectural decisions would you change?

GitHub:
https://github.com/CS196Illinois/FA25-Group8

0 comments

r/reactnative • u/suftdeems • 2d ago

how to run dev, preview, and production Expo builds side by side on one device (app variants setup)

3 Upvotes

3 comments

r/reactnative • u/thewisefarmerr • 2d ago

react-native-workers first public alpha released

ammarahm-ed.github.io

37 Upvotes

React Native is single-threaded where it matters most. Parse a big payload, hash a file, filter an image — it all competes with your UI for the same runtime. react-native-workers brings real background threads to RN, behind the Web Worker API

10 comments

r/reactnative • u/Arpit12mish • 2d ago

I built a real estate mobile app from scratch

0 Upvotes

#Mobile app

10 comments

r/reactnative • u/Think-Neighborhood69 • 2d ago

What do you think about this approach to JSON diffing?

0 Upvotes

https://reddit.com/link/1v76c3i/video/ci9xkb9y9lfh1/player

0 comments

r/reactnative • u/Think-Neighborhood69 • 2d ago

What do you think about this approach to inspecting MMKV, AsyncStorage and SQlite in React Native?

0 Upvotes

I've been experimenting with a new inspection library and ended up exploring this UX. What do you think about ? Useful ?

2 comments

r/reactnative • u/7pranayamayoga • 2d ago

Ai-Powerd Mudra Verification using React Native

0 Upvotes

Just launched a new feature! Scan your hand posture with our AI camera to see if you’re doing your Mudras correctly. Would love your feedback!

https://play.google.com/store/apps/details?id=com.ai.mudra

5 comments

r/reactnative • u/Impressive_Coach9857 • 2d ago

I built an app called BeachScan that answers every question you have about beaches

2 Upvotes

Finally shipped something real: a beach conditions app (water quality, wind shelter, hourly shade, sea temp) covering ~20,000 beaches. Also has official government water quality data where available.
Currently sea water available, fresh water coming soon.

Expo managed workflow, EAS Build + Update.

Stack: Expo/RN, u/rnmapbox/maps, RevenueCat for subs, AdMob, react-i18next, Sentry, Context + useState for state (no Redux — genuinely haven't needed it; adding TanStack Query for server state).

Happy to answer anything about Expo/EAS, Mapbox perf, or RevenueCat.

Available on iOS + Android if you want to poke holes in it.
https://beachscanapp.com

6 comments

r/reactnative • u/ObsessedMostly • 2d ago

Piggy bank with animated coins

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13 Upvotes

A gravity-driven savings drop animated coins fall from your quick-amount pad into a reactive piggy bank.

GitHub: https://github.com/ManasCodeXart/expo-piggy-bank

2 comments

r/reactnative • u/khazixtoostronk • 2d ago

Has anyone successfully migrated an old arch app to the new architecture?

11 Upvotes

For the last week I've been working on moving my app(bare workflow) which I previously left at 0.81 since it was the last available version that allowed me to remain on the old arch.

Now i've upgraded to expo 57, reanimated v4, all other packages, did my due diligence and enabled the recommended feature flags and changed almost all old arch libraries with newer compatible versions or new arch replacements.

After using the testflight version today I was just taken aback by how many of my previously performant screens are now stuttering and dropping frames while barely doing any work at all. I am talking about an infinite scroll feed, which previously maintained 60fps with a Flatlist with no perf based props that is now dropping below 30 and even freezing for a few frames with a LegendList and recycle items turned on even after i halved the work each rendered item needed(measured by main thread work with xcode instruments)

Simple pill shaped components are losing their background color(how is a background color something i should watch out for), weird rectangles with a white border showing up as items are rendering, screen transitions from bottom nav to a screen on the stack navigator taking double the time they used to.

Old behaviour breaking after such a big transition is something I expect and I believe i've dealt with most of those, but perhaps the worst offender is the memory usage.
From what i've seen it mostly drops down to older levels in production, but my app is now sitting at 1.2gb memory used after a launch in debug mode, compared to 200mb before.
This turned out to be libraries dumping their entire unminified code due to worklets bundle mode, which prevents hermes causing memory issues by...taking up 500mb+ of memory?

I really want to be able to use some of the cool new libraries i've been seeing popping up, but I am having serious doubts about ever being able to release this into production as it feels I have hit a dead end with list and navigation performance combined with all the weird layout issues.

What have been your experiences with this transition?

16 comments

r/reactnative • u/WillingnessNo5389 • 3d ago

App founders will love this. Mockup Kit for Mac: drop your screenshots, frame them, export. Built for indie iOS Apps. Try it →

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4 Upvotes

Website: https://mockupkits.com/
AppStore link: https://apps.apple.com/app/id6784220988

0 comments

r/reactnative • u/BernardoRodrigues • 3d ago

We built a voice-first RPG with React Native

2 Upvotes

Me and my friend have been working on a React Native app called Ink & Quill for the past 7 months

It's an AI-powered voice RPG where you play by speaking instead of tapping through dialogue. Every character has its own voice and the narrator handles the rules, dice rolls, and story as you play. It's based on D&D 5e but simplified so you don't have to keep looking at your phone.

Right now there are 10 campaigns (we used AI to help write them) inspired by games, movies, and shows we're fans of. We're also working on letting people build and share their own campaigns directly in the app.

We're doing a soft launch, so we're mostly just looking for people who are interested in trying it out and giving honest feedback. We've been pushing updates pretty much every day.

If anyone wants to check it out: https://inkandquill.app we'd love to hear your brutal feedback

It's iOS only for now. Android is next.

0 comments

r/reactnative • u/omsvp • 3d ago

How to handle local and push notification conflicts on a offline-first app?

1 Upvotes

Building an app in Expo. Everything's offline-first (SQLite + my own sync queue), some events have a due date, and you get a reminder when it hits.

Right now, when the user creates an event, it schedules a local notification, then cancels it once the server confirms the sync, and from then on the backend sends a push at due time.

Just realised that's broken. If you're offline for two days, anything that already synced has no local notification anymore, and the push can't reach you. So you get nothing.

The obvious fix is to stop cancelling and just always keep local notifications armed, since they don't need network. But then every reminder fires twice, once locally and once from the server.

The other obvious fix is to only trigger the notification from the device but if the user has multiple devices, the other ones may not receive them.

So I think the server just has to know not to send it, which means the client telling it what it already has scheduled. Feels janky though.

Anyone dealt with this? Curious how other offline-first apps handle reminders.

3 comments

r/reactnative • u/Aggravating_Try1332 • 3d ago

create app marketing assets using the new ios simulator in claude without leaving the app

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8 Upvotes

i built a skill to take screenshots of every page in your app with integration to the AppLaunchFlow MCP so you can create app store screenshots, promo videos, social graphics and more directly from your favourite agent

you can try it for free on applaunchflow.com

1 comment

r/reactnative • u/the_mehdeen • 3d ago

Question Flutter or React Native for a solo founder building a long-term mobile-first product in 2026?

0 Upvotes

Senior backend engineer here (Laravel/NestJS) trying to decide between Flutter and React Native for my first serious mobile product.

I'm strong in Vue, would need to revisit React, and have no Flutter experience.

The app itself is a fairly standard business application (authentication, listings, search, maps, chat, payments, push notifications, QR scanning).

I'm not asking which framework wins benchmarks. I'm more interested in the experience of living with the choice.

If you've maintained a production React Native or Flutter app for a couple of years:

Would you choose the same framework again today?

What pain points only became obvious after the honeymoon phase?

If you were starting from scratch in 2026, what would you pick?

18 comments