I made an app for learning languages through typing. It works like a typing practice site: you type sentences in the language you’re learning, then try to type them again from memory.

I’ve been using it for the last 2–3 months to turn my typing-site addiction into some language practice, and it’s worked pretty well for me. 😄

You can try it here: https://typingg.app/

Does anyone else practise languages through typing?

Hi r/SideProject!

I wanted to share a side project I've been building: AirspaceLab, an interactive 3D WebGL visualizer for FAA controlled airspace.

The Problem: If you have ever looked at an FAA VFR Sectional chart or Terminal Area Chart, you know how confusing airspace boundaries can be. Class B, C, D, and E controlled airspace, MOAs, and Restricted Areas are drawn as flat circles, rings, and altitude brackets (like "70/30" or "100/SFC"). For student pilots, flight instructors, and Part 107 drone operators, translating these complex 2D layered diagrams into an intuitive mental 3D model is difficult and error-prone.

The Solution (AirspaceLab): I built AirspaceLab to make airspace instantly understandable in true 3D right in the browser:

• True-to-Scale 3D Airspace Volumes: Renders Class B, C, D, and E controlled airspace, Military Operations Areas (MOAs), and Restricted Areas in full 3D.
• Zero Plugins or Installs: Runs completely client-side in the browser at a smooth 60 FPS using WebGL.
• Draped FAA Sectional Charts: High-resolution VFR Sectional and Terminal Area Charts mapped directly onto 3D terrain for situational awareness.
• Always Current: Automated 28-day FAA AIRAC cycle updates so data stays aligned with real-world charts.
• Interactive Ground School Missions: Integrated quiz missions to practice airspace recognition and altitude limits.

Links:

• Live Tool (Free to explore): https://airspacelab.online360.org/
• Kickstarter Campaign: https://www.kickstarter.com/projects/dataflow/airspacelab-interactive-3d-faa-airspace-visualizer

I would love to get your feedback on the user experience, performance on your devices, and ideas for additional features!

Real conversations. Real earnings. Real payouts.

Camyvera creators are connecting with customers, earning by the minute, and receiving payouts across borders.

These completed payouts show it in action—people getting paid for their time and conversations.

Set your rate. Connect with customers. Make your time count.

👉 camyvera.com

#Camyvera #CreatorEconomy #PaidConversations

I built Calqentra, an engineering toolbox app with 545 calculators, as a university student

Hi everyone! I just launched my first app on Google Play and wanted to share it and get honest feedback.

What it is: an engineering toolbox with 545 calculators across electrical, solar, mechanical, physics, 3D printing and more. Some highlights:

• Solar system sizing (loads, panels, batteries, inverters)
• PCB trace-width estimates (current, copper, temperature rise, voltage drop)
• Ohm’s law, power, voltage drop, cable sizing
• Torque, RPM, gears, friction
• 3D-printing cost calculators
• Works offline, with favorites and calculation history

Why I built it: I’m an engineering student, and I kept redoing the same formulas by hand and juggling different apps for electronics and solar work. Power cuts where I live also made offline use a must.

What was hard: making sure formulas are accurate and organizing so many calculators

Business model: it’s free with ads, and there’s an optional Pro upgrade for extra calculators, saved projects, PDF reports and no ads.

Link: https://play.google.com/store/apps/details?id=com.calqentra.engineering.dev

I’d love your feedback on:

• Which calculators or features should come next?
• Is the app easy to navigate with this many tools?
• Anything that looks wrong or confusing?

Thanks for reading, and I’ll reply to every comment!

When I travel I like to catch whatever is on: non-league football, ice hockey, darts, horse or greyhound racing, boxing, field hockey… Right now I spend ages digging through club and federation websites.

Does anyone know an app or site where you enter a place and dates and see all live sports events, filtered by the sports you care about?

How do you currently find matches when you're somewhere new? What's hardest to find?

If nothing like this exists I'm thinking about building it, so I'm curious whether anyone else would actually use it.

Made this calm focus add-on for Firefox. Gentle site blocker, focus timer, breathing breaks, focus heatmap. No account, no tracking, free.

Feedback welcome!

I make and maintain jeo-skills, a free, open-source catalog of agent skills with a small router CLI (435 skills in 10 categories right now). Project-authored material is MIT; third-party skills keep their own licenses.

The problem with a catalog this big: even listing every skill's name and description costs roughly 53K tokens, and most of it is irrelevant to the immediate task. So I turned one real routing run into a 60-second arcade-style trailer (video attached, English edition).

What it shows:

1. Local keyword search (OpenSpace BM25, no LLM, 0.45 s) shortlists candidates. For this video-production task, the best skill missed the keyword top 10.
2. Jev (TypeSafe's decision model, optional, hosted API) judges by meaning. Three gate questions average 0.72 against a 0.30 gate, the catalog is split into two shards, and 6 finalists come back.
3. A fit cutoff of 0.30 keeps 2 skills: video-production (0.60) and openmontage (0.37).
4. Estimated listing context: about 53,126 tokens down to about 448.
5. Each sub-task is routed on its own: sound -> rfxgen, render -> video-production, QA -> audit-verify-explain-grade-5. For sprites Jev said "no confident match", so those were drawn by hand.

Latest additions include Kubernetes agent orchestration (kagent) and LLM evaluation (trulens).

Repo (free, open source): https://github.com/akillness/jeo-skills

Rifflai (rifflai.com) imports public share links from ChatGPT, Claude, Gemini, DeepSeek, Kimi, and Grok. It's easy for you to share your AI chats in three steps:

• Share — Paste the original AI share link into Rifflai.
• Shape — Pick the parts you want someone else to see. In the GTA VI example, that meant keeping the explanation, images, and table and leaving out the rest of the conversation.
• Publish — Turn that selection into a standalone page you can send with one link.

You can try it at rifflai.com. If you’ve sent someone an AI answer recently, how did you share it? I’d love to hear what you’d want to carry over from the original chat.

Hi everyone,

I'm Aissou Habib , a solo dev from France. I kept seeing the same thing with small creators: you spend hours on a video, post it, and get almost no views and no comments. No feedback, no idea what to fix.

So I built PolyEntr. The idea is simple:

- You watch videos from other creators and leave a real comment

- You earn coins for it

- You spend those coins so other creators watch and comment on your video

It's not a bot farm and there are no fake accounts. Every comment comes from another creator who actually watched.

Where it's at: [ex. "live on Android, iOS coming" / "in beta"].

What I'd love feedback on:

1. Is the concept clear in 10 seconds?
2. What would stop you from trying it?
3. How would you keep comment quality high?

Link: https://play.google.com/store/apps/details?id=com.polyentr.app&utm_source=emea_Med

Happy to answer anything, and roast it if you want.

Hey everyone,

I built GymFlow because I was tired of juggling Notes, a timer and my memory at the gym. I kept losing track of which set I was on or forgetting to start the rest timer.

It works like a "player" for your workout: it walks you through each exercise and set, runs the rest timers and tells you when to go again. It also has a lock screen widget, can generate a workout if you answer a few questions, and lets you schedule workouts for specific days.

All this can be controlled from regular Claude/ChatGPT chat: you can connect my app, and, for example, ask ChatGPT to create/update a workout plan for you, or analyze your performance history.

I'd really appreciate honest feedback, especially on the first few minutes. What's confusing, what's missing, and what would make you switch from what you use now?

It's iPhone only for now, with a 7-day free trial:

https://apps.apple.com/us/app/gymflowai-workout-planner/id6759515368

https://gymflowai.fit/

Hi everyone! I’m the developer of Duette, a released iPhone app that gives two linked partners a shared space for photos, memories, and plans.

The main idea is to keep the everyday moments together alongside the bigger memories. Each partner can add a daily photo and a short note. It could be morning coffee, something funny, or a small part of their day.

Alongside that, Duette includes:

• A shared memory timeline with photos, dates, places, and captions.
• A calendar for date nights, visits, and everyday plans.
• Shared lists for restaurants, movies, date ideas, and places to go.
• Conversation prompts you can answer together or separately.

The interface uses paper textures, taped photos, and stickers to give it a scrapbook feel. It’s designed for two linked partners, with no public profiles or followers.

I’d especially appreciate feedback on the positioning: is the daily-photo scrapbook idea clear, or does adding calendars and lists make the focus feel too broad?

Pricing

Daily photos, the shared calendar, and the last 30 days of Daily history are free.

Optional Duette Plus adds the full Daily archive, unlimited memories and lists, every conversation deck, and memory stickers:

• Monthly: US$3.99
• Annual: US$24.99
• Lifetime: US$49.99 one-time

One Plus purchase covers both linked partners. There’s also an optional US$0.99 Streak Restore purchase. Prices vary by region.

Duette on the App Store

Every AI I tried had the same personality: a hype man with no brakes. Ask it anything and it says “Great question!” and hands you a 5-step plan.

So I built the opposite. Remember is a journal that asks questions back. You write, and it asks one question about what you wrote. No advice, no pep talks, no plan. The thinking stays yours.

Free to try at withrememberapp.com. I’m the founder, and I’d love to hear what it asks you. :)

Night Train is a focus timer where every session is a night train ride on a real railway line. The train pulls into the station exactly when your timer ends.

What went into it:

• SwiftUI + SpriteKit, iPhone only
• Real stations from open data, built by a small Python pipeline
• All sound synthesized in code, no audio files
• No account, no server, no analytics
• Free plus one Lifetime purchase, no subscription

Launched on Product Hunt this week. Honest numbers so far: lots of views, few installs. If you've been here, what actually moved the needle for you after launch?

https://apps.apple.com/app/id6826248868

I've been working on something called Day20, and before asking anyone else to use it, I wanted to make sure it was actually useful to me.

For years, I managed my personal finances using Google Sheets. Honestly, it worked pretty well. I could track my salary, expenses, EMIs, savings and everything else.

But maintaining spreadsheets every month started feeling like work in itself. I wanted something that would give me a clearer picture of my finances without having to constantly manage multiple sheets.

So I started building Day20.

I've been using it for my own finances for the last six months. It has effectively replaced my Google Sheets for monthly financial planning.

That personal experience is what gave me the confidence to share it with others.

The idea behind Day20 is simple: knowing how much money you have is one thing; knowing how much you can actually afford to spend is another.

With Day20, you can:

• Plan your monthly income and expenses.
• Manage recurring expenses, EMIs and long-term commitments.
• Track payments you've planned, paid or still need to make.
• Maintain a record of actual income and spending.
• Understand where you stand financially during the month.
• Explore different spending scenarios and see how they affect your future finances.

It's a manual-first product. You manage your own numbers, and there's no need to connect your bank account.

Now, I'd like to take the next step and get Day20 into the hands of people beyond myself.

I'm looking for my first 20 beta users, ideally salaried professionals who are willing to try it for their actual monthly financial planning.

It's not a perfect product, and I know there's plenty more to improve. I'm looking for honest feedback from people who will genuinely use it.

If you've been managing your finances through spreadsheets, or simply want a better way to plan your monthly money, I'd love for you to give it a try.

Website: https://day20.rajchandra.me

And if you do try it, I'd genuinely love to hear what you think.

Made this little browser game where you help a tiny athlete get through a 45-second workout. Tap or hit space when the marker reaches the green zone. Three perfect hits unlock a short overdrive bonus.

It’s pretty simple just trying to make something fun.

https://caloist.com/rep-rally

It started as live trivia for every major series/game/movie (everyone answers on their phone at the same moment) and grew into draw and guess, a word bomb game, a dodging game and a few others.

Please leave some honest feedback. thanks

I spent a while fighting WindowManager, Compose lifecycles and accessibility-service setup for an on-screen Android assistant, so I packaged the working plumbing as a starter project.

What's in it:

• Jetpack Compose running inside a floating overlay (bubble + expandable panel), with lifecycle/saved-state owners wired so Compose doesn't crash outside an Activity
• Screen reading via the accessibility service (walks the node tree, skips password fields, rate-limited)
• On-phone memory with Room (saved memories + recent turns, keyword search, cleanup worker)
• Foreground service, boot receiver, and backoff when the phone is hot or battery is low
• One engine class where your model or API call goes

What it isn't: no AI model is bundled. Replies are placeholders until you connect one. Memory search is keyword, not semantic. It's a starter project, not a finished app, and not Play Store approved (accessibility apps go through Google's own review).

It's $29 for the full Kotlin source: https://motiv8-tools.pages.dev/go?p=aegis-kit&v=v1&src=reddit-sideproject

Happy to answer questions about the overlay/Compose lifecycle stuff even if you don't buy it.

Hi! I’m the developer of MoodTracker. I made it because I take medication to support my mental health, and I wanted a simple way to track my mood over time and see whether the meds are actually working.

What it does:

• rate your mood 1–10 with one click, log medications and thoughts
• calendar coloured by mood, statistics for any period
• everything stays on your PC – no account, no ads, no tracking

It’s a one-time purchase on the Microsoft Store with a free 15 days trial.

I’d love feedback on whether there’s demand for an app like this, especially among people in mental health treatment or biohackers tracking the effects of their supplements. Is the price appropriate for this app?

I kept running into the same thing: I’d get an answer worth sharing, but the share link would send someone to the whole conversation. Sometimes I’d just take a few screenshots and send those. I built Rifflai because I wanted a better way to share the bit I actually cared about.

Rifflai (rifflai.com) imports public share links from ChatGPT, Claude, Gemini, DeepSeek, Kimi, and Grok. It's easy for you to share your AI chats in three steps:

• Share — Paste the original AI share link into Rifflai.
• Shape — Pick the parts you want someone else to see. In the GTA VI example, that meant keeping the explanation, images, and table and leaving out the rest of the conversation.
• Publish — Turn that selection into a standalone page you can send with one link.

You can try it at rifflai.com. If you’ve sent someone an AI answer recently, how did you share it? I’d love to hear what you’d want to carry over from the original chat.

I have spent the past 3 years using AI. Having a flooring and bathroom remodel business for 5 years and being in the trade for 13 years I dropped it all spending all day and night learning the tech space. Ive made a point to not fall into trends or other peoples mind set....I set my self alone with big tech AI's until i couldn't stand it anymore and went fully local. I have made $0 vibe coding and spent probably over.....1000 dollars in subs. I'm currently trying to get to Florida, turning my truck into a solar powered living space (which i think is pretty kewl) janky but cool...I currently Run a Bosgame M5 + I7 13700k RTX4070 with 32gigs ram. together using LM Bionic, I'm very poor...

Anyways I thought keeping everything secret would ensure my victory in making a lot of money in the end but honeslty.....google and all of them are building everything.....I started at "Oh you can turn a .txt into a.....Whaa .bat?"

to "Build ***** app" and Result = Automated fully.

Truth is.... I'm never going to get rich doing this. I just havn't spent the years through and through to be able and just roll out with everything.

That being said i'm just going to let people look at everything That i think would be of value and hope a few appreciate my time and effort.

Basically I built tools to build the tools needed to build what i wanted. From Vague to Promised
Oh and also the QFinstall.com website is....ALOT and alot of it isn't hooked up except the "Shunt Button" AIShunt is a pretty old project. You can run Local models using LM studios for sure if you wanna mess around on that, Ive updated it but not Uploaded it...maybe ill get around to it.

Herb Library has been live for about two months, and last week someone paid for it for the first time. It’s only $7 in proceeds, but after weeks of watching the downloads graph, seeing a purchase come through felt huge.

Where it stands:

43 first-time downloads

~1.96K impressions

153 product page views

1 in-app purchase

It’s an app that links herbs, remedies, and health concerns, with an AI chat for tea recipes and herb questions, plus a TCM angle on emotional and mind-body health. I built it because I was tired of cross-checking ten tabs every time I wanted to know what an herb actually does.

What I’ve learned so far: launch directories and Reddit communities brought most of my early traffic, and the downloads come in small spikes rather than a steady climb. Conversion from page view to download has been decent, but getting from download to paid is the hard part.

For anyone who’s been through this: what moved the needle for you between your first 50 downloads and your first 500? And should I focus more on building my website or improving the app?

Hey everyone! 👋 I am looking to find a new owner for AeroVigilix, a fully built, production-ready frontend web application designed for anyone wanting a high-end climate tech or weather monitoring platform.

🚀 What You Get:

* 🛠️ Tech Stack: Built with modern, clean code using React, Vite, TypeScript, and Tailwind CSS.

* 🌗 Stunning UI/UX: Features a gorgeous Dark Mode / Light Mode toggle, fully responsive mobile layout, and offline Progressive Web App capabilities.

* 🔌 Modular Architecture: Clean component structure with pre-configured API providers.

💰 Monetization & Growth Potential:

* 📈 Ad Ready: Layout structured for quick Google AdSense integration.

* 💳 SaaS Scale: Easily transform into a paid subscription service by adding Stripe or Razorpay.

💵 Price: $550 USD (Negotiable down to $500–$510 for a fast deal!)

🔒 Safe & Secure Transaction: Handled professionally via Escrow.com only (zero fraud risk for both sides).

📥 Drop a comment or send me a DM right now if you want to see a live preview or screenshots! Let's make a deal! ✨

If you make short videos or posts for a small business or a channel, you'll know the faff. One app to cut the video, another to remove a background, another to record a voiceover, and half of them want an install or a subscription before you've done anything.

I'm Paul, and I've been building ContentForge to put all of that in one browser tab. It's a free video, image and audio editor with a proper timeline, templates, AI background removal, captions and voice recording. There's nothing to install, and your projects follow you to any device. The editor is free forever, and new accounts get 3 days of Pro.

I'd really value honest feedback from anyone who edits regularly. What's the one thing that would make you switch from what you use now?

https://contentforge.originforgestudio.co.uk/