Hackernews posts about W21

W21 is a year class in Y Combinator's (YC) accelerator program, indicating that these are startups that were part of the Winter 2021 batch.

1. RocketSDR – Are they faking being backed with YC?
   4 points by blendertom 10 days ago | 3 comments
2. Show HN: TalkToSales makes websites voice-controlled (talktosales.com)
   2 points by kolchinski 30 days ago | discuss
3. Launch HN: Magic Patterns (YC W23) – AI Design and Prototyping for Product Teams
   184 points by alexdanilowicz 6 days ago | 114 comments
4. Arroyo (YC W23) has been acquired by Cloudflare (www.arroyo.dev)
   113 points by necubi 17 days ago | 38 comments
5. Launch HN: Augento (YC W25) – Fine-tune your agents with reinforcement learning
   101 points by lmeierhoefer 27 days ago | 60 comments
6. Launch HN: Infra.new (YC W23) – DevOps copilot with guardrails built in
   55 points by TankeJosh 5 days ago | 35 comments
7. Rescale (YC W12) raises $115M for 1,000x faster physics – Bezos, Altman, Nvidia (venturebeat.com)
   5 points by gpoort 18 days ago | discuss
8. Release (YC W20) – Accelerating DevOps with AI-Powered E2E Testing (release.com)
   2 points by tommy_mcclung 20 days ago | discuss
9. Prometheus Fuels (YC W19) first product: carbon neutral methanol fuel (prometheusfuels.com)
   1 points by seltzered_ 9 days ago | discuss
10. Show HN: Colanode, open-source and local-first Slack and Notion alternative (github.com)
    139 points by hakanshehu 3 days ago | 48 comments
11. Show HN: Three Kind Words – Spread kindness one mysterious postcard at a time (threekindwords.com)
    9 points by objcts 19 days ago | 6 comments
12. Show HN: rtrvr.ai one shotted doing taxes using Gemini 2.5 Pro (www.youtube.com)
    4 points by arjunchint 24 days ago | 1 comments
13. Show HN:[Opensource] AIgr.id–Polycentric Infrastructure for Open and Plural AI (www.aigr.id)
    4 points by nvrstl 5 days ago | discuss
14. Show HN: Browser-Use MCP for Claude that works without an API key (twitter.com)
    4 points by vortex_ape 19 days ago | discuss
15. Show HN: Sayso – We Fixed AI Phone Calls (www.saysoapp.com)
    4 points by lschneider 21 days ago | discuss
16. Show HN: Twitter profile search that works (www.thepeoplenet.com)
    2 points by Jsuh 4 days ago | 1 comments
17. How the Wealth Was Won: Factor Shares as Market Fundamentals [pdf] (www.nber.org)
    2 points by luu 30 days ago | discuss
18. Topologically Aware Job Scheduling for Slurm [pdf] (2014) (prace-ri.eu)
    1 points by dhorthy 4 days ago | discuss
19. Tiny JavaScript Mistake Can Leak Credit Cards [video] (www.youtube.com)
    1 points by rashahacks 7 days ago | discuss
20. The resolution of the Bitcoin experiment (2016) (blog.plan99.net)
    1 points by Tomte 30 days ago | discuss
21. The Problem of the Problem (2013) [pdf] (cpb-us-w2.wpmucdn.com)
    1 points by Tomte 30 days ago | discuss
22. Types Don't Know (www.open-std.org)
    1 points by ibobev 30 days ago | discuss
23. Boarding passes and check-ins could be scrapped in travel shake-up (www.theguardian.com)
    26 points by wr1472 16 days ago | 23 comments
24. Even Realities Smart Glasses (www.evenrealities.com)
    2 points by wr1472 16 days ago | discuss
25. One quantum transition makes light at 21 cm (bigthink.com)
    255 points by Brajeshwar 3 days ago | 158 comments
26. Launch HN: ASim (YC S21) – Mobile app that generates mobile apps
    90 points by dli123 26 days ago | 61 comments
27. Top employee monitoring app leaks 21M screenshots on users (www.techradar.com)
    42 points by mooreds about 19 hours ago | 4 comments
28. US sets tariffs of up to 3,521% on South East Asia solar panels (www.bbc.com)
    21 points by pingou 5 days ago | 4 comments
29. IRS to overhaul its tech after finding $21.1B in fraud in just two years (fortune.com)
    13 points by bentobean 28 days ago | discuss
30. Ask HN: Biggest non-tech scientific innovations of the 21st century?
    12 points by coffeeaddict1 17 days ago | 1 comments