Hackernews posts about YC S21

YC S21 is the 2021 class of Y Combinator, a well-known startup accelerator and investor that provides funding and support to early-stage companies.

1. Launch HN: Twill.ai (YC S25) – Delegate to cloud agents, get back PRs (twill.ai)
   77 points by danoandco 22 days ago | 95 comments
2. Tell HN: Security Incident at Porter (YC S20)
   9 points by leetrout 15 days ago | discuss
3. Show HN: doola (YC S20) MCP: we built a way to start an LLC in Claude and Replit (www.doola.com)
   1 points by arjawn 2 days ago | discuss
4. Bombardier, Colab (YC S19) sign multimillion-dollar deal to design jets using AI (www.theglobeandmail.com)
   1 points by nickspacek 9 days ago | discuss
5. Show HN: I made a free alternative to SimpleCitizen (YC S16) (fillvisa.com)
   1 points by junaid_97 26 days ago | discuss
6. Ask HN: Hiring in the age of AI-assisted coding: what works?
   29 points by nitramm 22 days ago | 19 comments
7. Ask HN: Is GitHub's #1 repo fake? build-your-own-x 491K stars
   11 points by throwawaysoso 12 days ago | 3 comments
8. Ask HN: Teaching life skills through games, am I crazy?
   2 points by shivaniShimpi_ 15 days ago | 6 comments
9. Launch HN: Exa (YC S21) – The web as a database
   412 points by willbryk 12 months ago | 133 comments
10. Launch HN: GPT Driver (YC S21) – End-to-end app testing in natural language
    129 points by cschiller over 1 year ago | 82 comments
11. Launch HN: ASim (YC S21) – Mobile app that generates mobile apps
    90 points by dli123 about 1 year ago | 61 comments
12. Launch HN: Indy (YC S21) – A support app designed for ADHD brains (www.shimmer.care)
    85 points by christalwang 4 months ago | 93 comments
13. Show HN: Exa (YC S21) – embeddings search agent with >20x recall than Google (websets.exa.ai)
    28 points by willbryk about 1 year ago | 4 comments
14. Ask HN: Why is Meticulous (YC S21) still hiring to eliminate E2E tests?
    4 points by resiros almost 2 years ago | 2 comments
15. Show HN: Hedgehog (YC S21) On-Chain MPC Self-Custody Automations (hedgehog.app)
    2 points by cadillion almost 2 years ago | 2 comments
16. Show HN: Numscript, a declarative language to model financial transactions (playground.numscript.org)
    202 points by superzamp over 1 year ago | 47 comments
17. Show HN: Open-source distributed quantum compute network (quip.network)
    11 points by cadillion about 1 month ago | 10 comments
18. Show HN: A mobile app that generates mobile apps in 30 secs
    10 points by dli123 over 1 year ago | 4 comments
19. Show HN: ASim – generate functional mobile apps instantly on your phone (asim.sh)
    10 points by dli123 over 1 year ago | discuss
20. Show HN: ASim – generate usable mobile apps instantly (asim.sh)
    5 points by dli123 over 1 year ago | discuss
21. Show HN: Syntro.io (syntro.io)
    4 points by maomorales 8 months ago | discuss
22. Sharing Economy Thrived with Consumers but Lags in Corporate World. Until Now
    2 points by Stephen_Roamr about 1 year ago | 1 comments
23. Show HN: YC Network Search – Use natural language to find YC people (sena.so)
    3 points by recmend 7 months ago | 1 comments
24. Launch HN: Cactus (YC S25) – AI inference on smartphones (github.com)
    123 points by HenryNdubuaku 8 months ago | 63 comments
25. Launch HN: Airhart Aeronautics (YC S22) – A modern personal airplane
    738 points by n_ermosh over 1 year ago | 615 comments
26. Launch HN: Sorcerer (YC S24) – Weather balloons that collect more data
    365 points by tndl over 1 year ago | 172 comments
27. Launch HN: Silurian (YC S24) – Simulate the Earth
    338 points by rejuvyesh over 1 year ago | 141 comments
28. Launch HN: Haystack (YC S24) – Visualize and edit code on an infinite canvas (github.com)
    328 points by akshaysg over 1 year ago | 173 comments
29. Launch HN: Skyvern (YC S23) – open-source AI agent for browser automations (github.com)
    327 points by suchintan over 1 year ago | 74 comments
30. Launch HN: Undermind (YC S24) – AI agent for discovering scientific papers
    292 points by jramette almost 2 years ago | 126 comments
31. Launch HN: Stack Auth (YC S24) – An Open-Source Auth0/Clerk Alternative (github.com)
    280 points by n2d4 over 1 year ago | 141 comments
32. Launch HN: Hyprnote (YC S25) – An open-source AI meeting notetaker
    270 points by yujonglee 9 months ago | 180 comments
33. Launch HN: Muddy (YC S19) – Multiplayer browser for getting work done
    252 points by lele0108 almost 2 years ago | 111 comments
34. Launch HN: Morph (YC S23) – Apply AI code edits at 4,500 tokens/sec
    217 points by bhaktatejas922 10 months ago | 185 comments
35. Launch HN: Roame (YC S23) – Flight search engine for your credit card points
    192 points by zman0225 almost 2 years ago | 130 comments
36. Launch HN: CodeViz (YC S24) – Visual maps of your codebase in VS Code
    189 points by LiamPrevelige over 1 year ago | 89 comments
37. Launch HN: Deepsilicon (YC S24) – Software and hardware for ternary transformers
    189 points by areddyyt over 1 year ago | 79 comments
38. Launch HN: Bitrig (YC S25) – Build Swift apps on your iPhone
    188 points by kylemacomber 8 months ago | 122 comments