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. Launch HN: Trigger.dev (YC W23) – Open-source platform to build reliable AI apps
   151 points by eallam 1 day ago | 63 comments
2. Launch HN: Recall.ai (YC W20) – API for meeting recordings and transcripts
   97 points by davidgu 6 days ago | 51 comments
3. Launch HN: Reality Defender (YC W22) – API for Deepfake and GenAI Detection (www.realitydefender.com)
   92 points by bpcrd 29 days ago | 64 comments
4. OpenMeter (YC W23) Acquired by Kong (konghq.com)
   19 points by ycjohnharris85 13 days ago | discuss
5. United Airlines Invests in Astro Mechanica (YC W24) (www.reuters.com)
   10 points by sofiaa 27 days ago | discuss
6. RSA Signhash exception since last W11 update (github.com)
   1 points by osivertsson 8 days ago | discuss
7. Show HN: Fractional jobs – part-time roles for engineers (www.fractionaljobs.io)
   281 points by tbird24 29 days ago | 130 comments
8. Show HN: Paylooop – Cost visibility for AI agents
   12 points by yahyam 7 days ago | 6 comments
9. Ask HN: Why does Seattle feel so risk-averse compared to the Bay Area?
   6 points by annyma 15 days ago | 5 comments
10. Show HN: Cosmic AI Platform – Build and deploy CMS sites using natural language (www.cosmicjs.com)
    2 points by tonyspiro 21 days ago | discuss
11. Determinants and causal effects of admission to selective private colleges [pdf] (2023) (www.nber.org)
    33 points by EvgeniyZh 25 days ago | 52 comments
12. Determinants and causal effects of admission to selective private colleges [pdf] (www.nber.org)
    5 points by sternmere 25 days ago | 1 comments
13. Determinants and Causal Effects: Admission to Highly Selective Private Colleges (www.nber.org)
    3 points by walterbell 25 days ago | discuss
14. The Minecraft bank that lost $200,000 in 3 minutes [video] (www.youtube.com)
    2 points by lawrenceyan 25 days ago | discuss
15. Using Recounts to Measure the Accuracy of Vote Tabulations [pdf] (dspace.mit.edu)
    1 points by bediger4000 28 days ago | 1 comments
16. VNB: The Minecraft bank that lost $200k in 3 minutes [video] (www.youtube.com)
    1 points by chii 21 days ago | discuss
17. Why haven't quantum computers factored 21 yet? (algassert.com)
    340 points by ingve 16 days ago | 197 comments
18. Cloudflare incident on August 21, 2025 (blog.cloudflare.com)
    209 points by achalshah 26 days ago | 43 comments
19. Trucker built a scale model of NYC over 21 years (gothamist.com)
    107 points by speckx about 10 hours ago | 15 comments
20. AI fabricates 21 out of 23 citations lawyer sanctioned reported to state bar [pdf] (www4.courts.ca.gov)
    25 points by 1vuio0pswjnm7 3 days ago | 11 comments
21. Setting Up and Configuring LibreSDR B210/B220 AD9361 on Windows and Linux (gainsec.com)
    2 points by transpute about 4 hours ago | 2 comments
22. Show HN: Archil's one-click infinite, S3-backed local disks now available
    16 points by huntaub about 6 hours ago | 2 comments
23. Show HN: Syntro.io (syntro.io)
    4 points by maomorales 12 days ago | discuss
24. AWS CEO says using AI to replace junior staff is 'Dumbest thing I've ever heard' (www.theregister.com)
    1697 points by JustExAWS 26 days ago | 744 comments
25. Mark Zuckerberg freezes AI hiring amid bubble fears (www.telegraph.co.uk)
    817 points by pera 27 days ago | 903 comments
26. Seoul says US must fix its visa system if it wants Korea's investments (english.hani.co.kr)
    290 points by garbawarb 6 days ago | 226 comments
27. AI crawlers, fetchers are blowing up websites; Meta, OpenAI are worst offenders (www.theregister.com)
    231 points by rntn 26 days ago | 144 comments
28. Building my childhood dream PC (fabiensanglard.net)
    212 points by joexbayer 9 days ago | 84 comments
29. Meta bypassed Apple privacy protections, claims former employee (9to5mac.com)
    157 points by latexr 1 day ago | 75 comments
30. Why do we keep gravitating toward complexity? (kyrylo.org)
    149 points by PaulHoule 1 day ago | 169 comments