Hackernews posts about S21

S21 is a class of companies that received funding from Y Combinator's Summer 2021 batch of startups.

1. SpaceX Reports Second Quarter 2026 Results [pdf] (s21.q4cdn.com)
   29 points by simonpure 17 days ago | 3 comments
2. Nutritional benefits of sourdoughs: A systematic review (2022) (www.sciencedirect.com)
   8 points by BiraIgnacio 2 days ago | 1 comments
3. Launch HN: ProvenMetal (YC S26) delivers circuit boards in days instead of weeks (provenmetal.com)
   237 points by willcarkner 15 days ago | 156 comments
4. Launch HN: Bullet (YC S26) – A Faster Coding Agent (www.codewithbullet.com)
   121 points by adi1 8 days ago | 89 comments
5. Launch HN: Speko (YC S26) – OpenRouter for Voice AI (speko.ai)
   118 points by abdik 4 days ago | 68 comments
6. Launch HN: Screenpipe (YC S26) – Record how you work and turn that into agents
   88 points by louis030195 29 days ago | 67 comments
7. Launch HN: OneCLI (YC S26) – OSS sandboxed agent harness for teams (github.com)
   86 points by guyb3 2 days ago | 27 comments
8. Launch HN: Rise Reforming (YC S26) – Turning Waste Gases into Valuable Chemicals (www.rise-reforming.com)
   85 points by george_rose25 25 days ago | 38 comments
9. Launch HN: Hoplite (YC S26) – Effortlessly deploy cloud coding agents (hoplite.sh)
   81 points by BenceRed 18 days ago | 72 comments
10. Launch HN: machine0 (YC S26) – Persistent CPU and GPU VMs from the CLI (machine0.io)
    81 points by bwm 3 days ago | 44 comments
11. Launch HN: Prized (YC S26) – Let non-engineer staff build secure internal tools (prized.dev)
    79 points by marinoseliades 22 days ago | 59 comments
12. Launch HN: Stoa Markets (YC S26) – A Marketplace for GPUs and AI Servers (www.stoaexchange.com)
    77 points by erenberke 11 days ago | 51 comments
13. Launch HN: Tokenless (YC S26) – Automatic model switching to save money (usetokenless.com)
    71 points by rohaga 23 days ago | 63 comments
14. Automatic1111 for Apple metal, 40% speed up sd1.5 (therad.ninja)
    71 points by dmikey831 9 days ago | 24 comments
15. Launch HN: HyperProbe (YC S26) – Agents that do read-only debugging in prod (www.hyperprobe.co)
    69 points by shailendraht 16 days ago | 51 comments
16. Launch HN: Keet (YC S24) – An app to create video courses on anything (www.trykeet.com)
    48 points by zackashen 10 days ago | 48 comments
17. Launch HN: Vendo (YC S26) – Let users build features on top of your product (github.com)
    41 points by yousefh409 about 20 hours ago | 20 comments
18. Launch HN: EdotEnv (YC S26) – Quant Trading RL Envs to Teach LLMs Research (edotenv.com)
    39 points by Mzzzzz 17 days ago | 34 comments
19. S1-mini, Superwhisper's first open-weights language model (huggingface.co)
    10 points by Softmaximalist 2 days ago | 1 comments
20. Applied Electrodynamics (YC S26) A new kind of camera that can see through walls (twitter.com)
    5 points by max_zorin_phd 20 days ago | 1 comments
21. S2C – Shared Storage Consensus (github.com)
    3 points by theanonymousone about 16 hours ago | discuss
22. LineageOS support comes to the Galaxy S22 series (9to5google.com)
    3 points by thunderbong 3 days ago | discuss
23. A fake Galaxy S22 Ultra, taken apart layer by layer (chardonnet.github.io)
    3 points by techburger 16 days ago | discuss
24. ESP32-S31 now in mass production and available for purchase (blog.adafruit.com)
    3 points by snvzz 24 days ago | discuss
25. St13 Python package for trend analysis of financial markets (github.com)
    2 points by kensoh 12 days ago | 1 comments
26. Optimizing an NVFP4 Blockscaled GEMM on RTX Pro 6000 Blackwell GPU (SM120) (research.colfax-intl.com)
    2 points by matt_d 11 days ago | discuss
27. Pair Team (YC S19) Hit with Class Action Alleging Unpaid Wages (runtimewire.com)
    2 points by ryanmerket 14 days ago | discuss
28. Agentic AI at Two Different Scales: Nanbeige4.2-3B and Laguna S2.1 (kaitchup.substack.com)
    2 points by gmays 21 days ago | discuss
29. Fish Audio S2.1 Pro (twitter.com)
    2 points by smusamashah 23 days ago | discuss
30. Show HN: S2Q – Stripe payouts posted into QuickBooks itemized, no subscription (s2q.now)
    2 points by artproof 24 days ago | discuss