DontBuildThis

What it does

Don't build the wrong stuff. Paste an idea into dontbuildthis.com and let us roast it against live data, competitor signals + our own vault of wins/flops. You get a brutal score, verdict + tips so you can validate in mins, not months. No signup, free to use!

Get your startup idea roasted by AI. Fast, honest, and entertainingly brutal feedback to save you time and money before building.

Get a brutally honest roast AND a (surprisingly) logical score. Either walk away proud with a survivor badge, or... well, you get it. Pivot. Hard. Maybe consider AI for something less likely to cause existential dread, like optimizing cat meme delivery. Think: GitHub contributions x Fantasy Football x Sarcasm Memes. We don't roll dice. Ideas are judged on a legit rubric (market, moat, monetization, etc.). No mercy. Our AI doesn't care about your feelings or your VC connections. It only cares about facts, flaws, and flaming your fuzzy logic. Before you burn 6 months (and your life savings) on that "revolutionary" cat-themed dating app, let us save you. Only ~15% survive to get a badge. It…from dontbuildthis.com

• 
  SanityCheck Feb 2026 · sanitycheck.dev · ▲3

  Validate your startup idea in minutes — not months.

• 
  DontBuild.itMar 2026 · dontbuild.it · ▲13

  Signal-first startup validation

• 
  FoundersWall2025 · founderswall.com · ▲35

  I used to be just a blogger. Now I build internet products, still without code, using AI, design, and taste. I was building in public on X for last 2 months. And honestly, I got tired of how it became performative and started to feel fake. I shipped 2 products. Both failed to get any real traction. I kept sneaking into popular builders’ profiles, hoping to learn how they do it. One thing I kept seeing everywhere, product launch directories. I thought here is the scope. So I started building one. Same UI like the rest. Nothing special. Suddenly one day when it was half built, I realized…

• 
  Test Your IdeaFeb 2026 · preuve.ai · ▲23

  Test your business idea before you build. Market validation with real data on competitors, demand, and viability from 60+ live sources. Free 60-second scan.

• IA
  I accidentally built a startup idea validation tool2025 · validationly.com · ▲15

  I was working on validating some of my own project ideas. While trying to find how to validate my idea, I realized the process itself could be turned into a tool. A few late nights later, I had something that takes any startup idea, fetches discussions, summarizes sentiment, and gives a quick “validation score.” It’s very rough, but it works, and it’s already making me rethink a few of my own ideas. It's still a work in progress. I don't actually know what I'm doing, but I know it's worth it. Honest feedback welcomed! Live demo here: https://validationly.com/

• 
  ShouldBuildAug 2026 · shouldbuild.io · ▲9

  Find out what your market wants before you waste months

• 
  Spira Maxima▲578

  Video model that turns script into viral social media videos

  AI · 17d ago · spira.ai

• 
  Rill Browser▲540

  The browser where Claude Code and Codex work beside you

  AI · 17d ago · rill.love

• 
  Germany's new sovereign AI model Kolibri▲424

  Kolibri is Aleph Alpha

  AI · 18d ago · tej.as

• 
  Giving Opus 5.5 a simulated paint canvas▲392

  Paintings by AI models: programs run through a simulation of oil paint.

  AI · 20d ago · stillwet.art

• 
  Onepin▲384

  AI voiceover with every name, price and date said right

  AI · 30d ago · onepin.ai

• 
  PixVerse R2▲381

  A real-time world model you can explore and change

  AI · 28d ago · world.pixverse.video

• IM
  I'm an airline pilot – I built interactive graphs/globes of my flights▲1,539

  Hey HN! Pilots everywhere are required to keep a logbook of all their flying hours, aircraft, airports, and so on. Since I track everything digitally (some people still just use paper logbooks!), I put together some data visualizations and a few 3D globes to show my flying history. This globe is probably my favourite so far: https://jameshard.ing/pilot/globes/all If you’ve got ideas for other graphs or ways to show this kind of data, I’d love to hear them!

  Life & fun · 2025 · jameshard.ing

• 
  Chronicle: Cursor for Slides▲1,212

  Stunning presentations with AI. No design skills required.

  AI · 2025 · chroniclehq.com

• 
  Bubble for native mobile apps (beta)▲1,026

  Build native mobile apps for iOS and Android without code.

  Dev tools · 2025 · bble.io

• 
  Twenty▲989

  Build your Enterprise CRM with an AI-friendly SDK

  Dev tools · 2025 · twenty.com

• 
  Pally - AI Relationship Management▲949

  All your connections, across all your socials.

  AI · 2025 · pally.com

• 
  Workout.cool – Open-source fitness coaching platform▲827

  I was the main contributor to workout.lol, an open-source fitness app to easily build a workout routine. The project had traction (1.4k GitHub stars, 95 forks, ~20K visits/month), but was eventually sold due to video licensing hurdles. The new owner stopped maintaining it, and the repo went abandoned. Over the next 9 months, I sent 15 emails to try to save it : no replies. Feature requests & issues were ignored. The community was left with a "broken" tool let's say. I couldn't just let it die So I built the new version from scratch with the same open-source spirit, but a better…

  Dev tools · 2025 · github.com