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. InpharmD (YC W21) Is Hiring – Senior Ruby on Rails Engineer (Rails 8, Ruby 3) (inpharmd.com)
   1 points by tulasichintha 24 days ago | 1 comments
2. Launch HN: Kampala (YC W26) – Reverse-Engineer Apps into APIs (www.zatanna.ai)
   100 points by alexblackwell_ 4 days ago | 84 comments
3. The most interesting startups from YC W26 Demo Day (techcrunch.com)
   3 points by PaulHoule 21 days ago | discuss
4. New development in PRNG of wyhash: w1rand (github.com)
   2 points by jinyu2026 29 days ago | 1 comments
5. Aggregated interviews on how YC W26 founders build internal AI employees (www.humanbehavior.co)
   1 points by SkylerJi 5 days ago | 1 comments
6. We graded 200 YC W26 companies on email security – only 23% got an A (wraps.dev)
   1 points by stewartjarod 20 days ago | 1 comments
7. Show HN: Most products have no idea what their AI agents did yesterday (velt.dev)
   5 points by rakeshgoyal 18 days ago | discuss
8. Show HN: Open Access Qwen3.6-35B-A3B-UD-Q5_K_M with TurboQuant
   4 points by freakynit 3 days ago | 2 comments
9. Show HN: Sally CLI Because "You're right" is probably wrong
   3 points by thomasgeelens 19 days ago | 1 comments
10. Show HN: Built a personality that lives across CLI, browser, and web –> all solo
    2 points by thomasgeelens 7 days ago | discuss
11. Level 5 – Weekly live demos from advanced AI users
    2 points by bilaxten 11 days ago | discuss
12. Show HN: Team agents that manage your CMS from Slack, WhatsApp, and Telegram (www.cosmicjs.com)
    1 points by tonyspiro 20 days ago | discuss
13. Run virtualized iOS with Private Cloud Compute drivers (github.com)
    10 points by goranmoomin 21 days ago | discuss
14. A freeform clock, with no computer [video] (www.youtube.com)
    2 points by GeoAtreides 28 days ago | discuss
15. Behind the Screens (behind-the-screens.tv)
    1 points by jgrahamc 3 days ago | discuss
16. Virtual Tour of the CFS Commercial Fusion Campus (April 2026) [video] (www.youtube.com)
    1 points by mpweiher 9 days ago | discuss
17. Show HN: Excalidraw-edit – Open and edit .excalidraw files from the terminal (github.com)
    1 points by wh1le 9 days ago | discuss
18. Show HN: Cynical Sally – a personality that remembers you, now on OpenClaw (clawhub.ai)
    1 points by thomasgeelens 19 days ago | discuss
19. Interval-Aware Caching for Druid at Netflix Scale (netflixtechblog.com)
    4 points by wb14123 5 days ago | discuss
20. Intel Releases OpenVINO 2026.1 with Back End for Llama.cpp, New Hardware Support (www.phoronix.com)
    4 points by wb14123 7 days ago | discuss
21. Sciwrite-Lint: Verification Infrastructure for the Age of Science Vibe-Writing (arxiv.org)
    3 points by wb14123 6 days ago | discuss
22. WebGPU – One Graphics API to Rule Them All (www.kitware.com)
    2 points by wb14123 6 days ago | discuss
23. TCode: An AI Coding Agent Leverages Neovim and Tmux (www.binwang.me)
    1 points by wb14123 4 days ago | discuss
24. Helping data centers deliver higher performance with less hardware (news.mit.edu)
    1 points by wb14123 4 days ago | discuss
25. Programming the Univac-1219 [video] (www.youtube.com)
    2 points by caminanteblanco 1 day ago | 1 comments
26. Show HN: MacMind – A transformer neural network in HyperCard on a 1989 Macintosh (github.com)
    159 points by hammer32 4 days ago | 42 comments
27. Show HN: CodeBurn – Analyze Claude Code token usage by task (github.com)
    110 points by agentseal 7 days ago | 26 comments
28. Show HN: Sostactic – polynomial inequalities using sums-of-squares in Lean (github.com)
    12 points by mmaaz 2 days ago | 1 comments
29. Show HN: Open-source distributed quantum compute network (quip.network)
    11 points by cadillion 18 days ago | 10 comments
30. Tell HN: Security Incident at Porter (YC S20)
    8 points by leetrout 3 days ago | discuss