I’ve been building AutoSize, a free website that lets you compare the dimensions of different cars side by side.

I started it because I wanted to choose a car based on the ISOFIX point, literally, and then the idea expanded rapidly.

\* Is the comparison easy to understand?

\* What feels confusing or incomplete?

\* What feature would make you come back and use it again?

Here’s the site: https://www.autosize.org/

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Pour mon project

Selkie is a web app for reading interactive novels that an AI writes as you play. There's nothing to install: it runs in the browser on a phone or a laptop.

How a turn works:

• You read a passage and pick a choice, or type your own move. Words in quotes are said; words in *stars* are done.

• Risky choices show the odds first. The engine rolls the dice. The AI has to write the result it's given.

• Characters remember what you did. The story keeps a clock too, so an afternoon spent on one thing isn't spent on another.

Built with SvelteKit, Node on Fly.io, Supabase and Stripe. The stories are written live by Claude. 23 books so far, from a villainess romance to three duels before noon in 1625 Paris. 18+.

Free for about seven turns, then one-off packs from $4.99. No subscription.

https://playselkie.com/?from=reddit-webapps

I'd most like to hear how the first five minutes feel on a phone.

hola como les va me serviria si alguien podria probar mi nueva app para hacer necuestas, examenes y test, como los de personalidad o personajes, es algo nuevo, es para no escribir todas las preguntas y respuestas a mano, gratis y sin publicidad, muchas gracias
oppros.web.app

A price chart tells you how the price moved, but it doesn’t explain what the business does. I’m building eStockes for researching US stocks and ETFs, and I want moving between those two kinds of information to feel straightforward.

Could you pick a familiar US company, open its chart, and find where you would read about the company itself within the app? Tell me which label you followed and the first point where you weren’t sure what to click next. Desktop or mobile feedback is welcome.

This is a web app, with paid Pro plans. No purchase is requested for the check. If a sign-in prompt stops you, that is useful feedback too; you don’t need to create an account just to report that obstacle.

https://estockes.com/dashboard?utm_source=reddit&utm_medium=community&utm_campaign=chart_to_company_20261115&utm_content=webapps

I run a bunch of college committees and got tired of sending out When2Meet links that look like they’re from 1998 and barely work on a phone.

So I built a cleaner, mobile-friendly version with the same zero-signup and obviously completely free: https://get.together.workers.dev/

Feel free to give it a try

I used Spendee for years until it started getting in the way, so I built my own replacement. It’s been my daily money tracker for a while now, and I’ve opened it up for anyone to use.

What it does

• Monthly view: your balance, what you’ve spent and earned, what’s still to pay this month, and where the money went by category.

• Transfers aren’t spending: moving money into savings, investments or a loan is a transfer, so your spending number doesn’t spike on payday.

• Loans with a payment plan: each payment counts as spending and lowers what you owe. You see every payment made and planned, and the month it’s paid off.

• Every month, automatically: rent, salary and subscriptions post themselves on their day, and a schedule can stop after the last loan payment.

• 31 currencies, bitcoin and gold: paying abroad? Type 50, pick USD, and the day’s rate is filled in (you can change it to what your bank actually charged).

• Net worth: savings, investments, property and debts in one number.

• Split a receipt: one supermarket trip can be part groceries, part household, part gifts.

• Card statement import (CSV): every purchase becomes an item in its own category.

What it doesn’t do

• No bank connection. You add entries yourself; it’s quick, and nobody gets your bank credentials. Statement files are read in your browser.

• No ads, no tracking inside the app, no paid plan. It runs on Cloudflare’s free tier, so it costs me almost nothing to keep it free.

Works on desktop and as a home-screen app on your phone, in 6 languages (EN, DE, FR, ES, TR, RU).

https://kasafinance.online/?ref=reddit-webapps

Hide messages, files and folders inside ordinary images and secretly share data.

I made Impossible Print, a free, open-source web app that turns an image or text into a perspective illusion for a wall and a tabletop. It generates distorted pieces for a chosen viewpoint, previews them in 3D, and exports PNGs and an A4 assembly plan with a calibration ruler. Image processing happens locally in the browser.

Try the included artwork, switch between Camera view and Orbit overview, then change the viewpoint or surface dimensions. The preview is virtual: a physical print needs accurate measurements, actual-size printing and careful alignment. It models two flat surfaces meeting at 90 degrees; it doesn't scan your room or calibrate from a camera.

App: https://impossible-print.vercel.app/

Source and print guide: https://github.com/ufodia/impossible-print

I built it with AI assistance. I'd appreciate feedback on the browser workflow: is it clear how to choose and mark the viewing point before printing?

Hi r/WebApps, we're the small team behind uOS (UltimaOS).

It's a full workspace as a web app: a desktop with windows, chat, mail, video calls, files, documents, spreadsheets, presentations, boards, calendar, notes and tasks. More than 20 apps on one account, nothing to install, works on desktop and mobile browsers.

The part we're most proud of technically: all content is encrypted in the browser before it reaches our servers. Keys are generated and kept on the device, and the crypto is post-quantum (ML-KEM and ML-DSA) paired with X25519 and Ed25519. Real-time collaboration on documents still works on top of that.

It's in alpha, so expect rough edges. You can try it for 3 days without an invitation, and personal use is free.

We'd really like feedback from people who build web apps themselves: performance, UX, anything that feels off.

The source code of the secure part is open at https://uos.sh/code

Try it: ultimaos.com

Over the last year I have been building bidjig.com, which is a browser extension currently only for Chrome & Firefox- that searches over 420 partner stores for the same product from your product page- cheaper; alternatives to that product; coupons; and 90 days of price history

I am constantly working on and upgrading BidJig, and started this project doing CS in uni

Feedback appreciated- especially if product pages where BidJig shows the wrong match

BidJig is free, and no account needed

Hey Brotha! I want to introduce something I've been building called IdeaClash.

Building something is exciting until you get stuck. Your friends think your idea is great. Your team likes your MVP. But nobody really questions your decisions. Maybe you're struggling with distribution, growth, or figuring out what to do next. Sometimes, you don't need another tool or motivational quote. You just need another builder who sees things differently.

That's what got me thinking about Idea Clash. What if builders could challenge each other's thinking the way two dancers challenge each other in a dance battle?

Idea Clash is a live video arena where two builders meet for a 33-minute session to challenge each other's ideas, products, problems, strategies, and decisions. Think of it as a dance battle for ideas. Instead of competing with moves, you clash with perspectives.

Here's how it works: In Round 1, you bring something you're building or struggling with. The other builder questions your assumptions, challenges your decisions, and shares a different perspective. In Round 2, you switch sides and do the same for them.

33 minutes. Live video. Both builders get their turn.

You could bring a startup idea you're unsure about, an MVP that needs a different perspective, a product struggling with growth, a marketing strategy, or a decision you're stuck on. The goal isn't to prove who's right or who's smarter. It's to uncover what you might be missing, explore different possibilities, and figure out what you could do next.

Attack ideas. Never builders.

I'm building this to create a space where builders don't just network or exchange compliments. They actually engage with each other's thinking.

If you're building something, I'd love to see you in the arena.

Here's Idea Clash: Idea Clash

https://fonlow.github.io/cbt/

Ishihara Color Blind Test is a free app designed for initial color vision screening and awareness. It provides multiple collections of Ishihara plates for both exploration and self-testing.

FEATURES
* 38/24/14 high-quality plates (SVG+) created by Martin Krzywinski / Canada's Michael Smith Genome Sciences Centre

So i built a website for performing operations on all kind of files, audio, video, docs, pfd, code, anything you can think of.

All files stay in the browser; no server file uploads of any kind.

But since i built it alone, i need actual feedback, what you think, how i can improve this.

site: utils.sbs