The best of Hacker News - April 30, 2025

1.
LibreLingo – FOSS Alternative to Duolingo

711 points

2.
Try Switching to Kagi

620 points

3.
Only Teslas exempt from new auto tariffs thanks to 85% domestic content rule

417 points

4.
Sycophancy in GPT-4o

146 points

5.
Show HN: AgenticSeek – Self-hosted alternative to cloud-based AI tools

87 points

6.
AirBorne: Wormable zero-click remote code execution (RCE) in AirPlay protocol

80 points

7.
Show HN: An MCP server for understanding AWS costs

59 points

8.
An illustrated guide to automatic sparse differentiation

57 points

9.
The last masters of Afro-Colombian machete fencing

52 points

10.
WorldGen: Open-source 3D scene generator for Game/VR/XR

43 points

11.
My sourdough starter has twins

42 points

12.
You Wouldn't Download a Hacker News

33 points

13.
What It Takes to Defend a Cybersecurity Company from Today's Adversaries

32 points

14.
Show HN: I build a Fantasy NHL app in 3 days with Claude AI

30 points

15.
Linux in Excel

26 points

16.
Princeton Engineering Anomalies Research (2010)

22 points

17.
Why 'Margin Call' remains Wall Street's favorite movie

16 points

18.
Millions of Apple Airplay-Enabled Devices Can Be Hacked via Wi-Fi

10 points

19.
Firefly's rocket suffers one of the strangest launch failures we've ever seen

9 points

20.
Mission Impossible: Managing AI Agents in the Real World

4 points

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