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.

Related: Athens Research Shopify AWS Android Lambda Instagram

Show HN: Cost.dev (YC W21) – making agents cost-aware and cheaper to call (cost.dev)

48 points by akh 15 days ago | 29 comments
Launch HN: Adam (YC W25) – Open-Source AI CAD (github.com)

210 points by zachdive 2 days ago | 97 comments
How to get into Y Combinator: notes from a W23 alum (github.com)

3 points by iCarossio 18 days ago | discuss
Open (YC W24): we'll refund every dollar, up to $2M, if our AI agent disappoints (www.open.cx)

2 points by gharbat 4 days ago | 1 comments
The State of Ship Quality: We Audited Every YC W26 Website (overlayqa.com)

2 points by emvied 9 days ago | 1 comments
Show HN: Talos – Open-source WASM interpreter for Lean (github.com)

90 points by mfornet 1 day ago | 22 comments
Show HN: Integuru – Integrate with platforms via the source code (www.integuru.com)

7 points by alanloo 21 days ago | discuss
Show HN: Open-Sourced Approxima, Our Agentic QA Tool to Catch Breakages Faster (github.com)

2 points by Intragalactic 6 days ago | discuss
Colossal Squid Are Everywhere. We've Been Looking Wrong [video] (www.youtube.com)

4 points by mpweiher 4 days ago | discuss
The Fix for AI's Spending Problem Is Not Good for OpenAI and Anthropic [video] (www.youtube.com)

3 points by mgh2 14 days ago | discuss
Louis Rossmann: Here's Why You Won't See My Videos in Recommended in the Future (www.youtube.com)

3 points by Cider9986 22 days ago | discuss
Interest Rate May Explain Consumer Sentiment Anomaly (www.nber.org)

3 points by efavdb 25 days ago | discuss
A framework for systematically addressing undefined behavior in the C++ Standard [pdf] (www.open-std.org)

1 points by linkdd about 3 hours ago | discuss
OS Written in Embedded Swift (github.com)

1 points by w10-1 about 3 hours ago | 1 comments
21 years and counting of 'eight fallacies of distributed computing' (2025) (blog.apnic.net)

144 points by teleforce 5 days ago | 56 comments
Simplicity always wins:SOTA on swe-pro,tb2,-verif on 21 models with simple-agent (github.com)

2 points by gaurav71531 about 4 hours ago | 1 comments
Launch HN: Runtime (YC P26) – Sandboxed coding agents for everyone on a team (www.runtm.com)

103 points by gustrigos 29 days ago | 30 comments
Yon – a topos-oriented language with a content-addressed lattice heap (yon-lang.org)

48 points by amenn 15 days ago | 80 comments
Twenty One Zero-Days in FFmpeg (depthfirst.com)

288 points by redbell 7 days ago | 198 comments
Taxonomy of the Occlupanida (parasitoids on bread bag tags) (www.horg.com)

197 points by beatthatflight 2 days ago | 47 comments
What every coder should know about gamma (2016) (blog.johnnovak.net)

126 points by sph 6 days ago | 46 comments
JD Vance Confirms Iran Will Get Jaw-Dropping Sum Under Trump Deal (newrepublic.com)

33 points by nothrowaways 4 days ago | 17 comments
Tons of Loctite adhesive used in Sagrada Familia's central towers (www.henkel.com)

21 points by melenaboija 1 day ago | 2 comments
Correlated LLM Name Priors and Their Haunting of the Web and Academic Publishing (arxiv.org)

4 points by sebg about 23 hours ago | discuss
Good Software Takes Ten Years. Get Used to It (2001) (www.joelonsoftware.com)

3 points by kalcode about 7 hours ago | 2 comments
How does a gas pump know to shut itself off? (1981) (www.straightdope.com)

3 points by downbad_ about 8 hours ago | discuss
The ancient book of wisdom at the heart of every computer (2014) (www.theguardian.com)

3 points by mot2ba about 24 hours ago | discuss
Toy Story 5 Is a Surprisingly Thoughtful Critique of Technology (www.engadget.com)

2 points by ilreb about 8 hours ago | discuss
Crypto industry braces for quantum computing threat (www.ft.com)

2 points by JumpCrisscross 28 days ago | discuss
Breakdown of Will (2018) (aaronzlewis.com)

1 points by rzk about 9 hours ago | 1 comments