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I built an open-source, local-first alternative to LangSmith
Hey HN. Built this because LangSmith needs a cloud account just to see my own traces. pip install opensmith — everything shows up at localhost:7823. SQLite. No accounts. No config. Fully offline. 800+ downloads in 2 days. Surprised me. Would love honest feedback from this community.
Crit
Crit is a single-binary CLI that opens your file or code diffs in a browser with GitHub-inspired interface. Your favourite agent acts on the feedback and responds back - continue until you're happy. I've been building this for a few months now and it's been helping me a lot juggling parallel conversations with agents, making it easier to actually review the plans they generate and the resulting code - all before it hits GitHub. It also allows you to export the plans to a hosted service (which you can self-host for privacy), to solicit feedback from your team. No account needed, and reviews are automatically deleted after 30 days of inactivity.
Veris
Show HN: Veris – Agent sandboxes with simulated external services
BattleClaws
Show HN: BattleClaws – A battle arena where AI agents fight autonomously
NFC tags are good material for pranks on Android
Show HN: NFC tags are good material for pranks on Android
I built an open-source email builder, alternative to Beefree/Unlayer
Show HN: I built an open-source email builder, alternative to Beefree/Unlayer
Tilde.run
Show HN: Tilde.run – Agent Sandbox with a Transactional, Versioned Filesystem
Red Squares
Show HN: Red Squares – GitHub outages as contributions
Explore color palettes inspired by 3000 master painter artworks
I built PaletteInspiration.com, a browsable archive of color palettes pulled from artworks by 3,000+ master painters (Monet, Vermeer, Raphael, Van Gogh). Why I built it: every color palette generator I tried converged on the same five muted pastels. Painters spent centuries figuring out color and we mostly ignore that body of work when picking colors for digital design. Please share your feedback on the Color Harmony Explorer - drag the wheel to any color and it shows which hues master painters historically paired with it (not only standard complementary, analogous, triadic, etc.) It is solely based on co-occurrence across thousands of real paintings. Not algorithmic color theory rules - actual empirical pairings. No signup, no paywall, no email capture. Just curious what people think.
New Benchmark from SWE-bench team is 0% solved
Show HN: New Benchmark from SWE-bench team is 0% solved
Octopus Code Review is now free for OSI-licensed repos
Show HN: Octopus Code Review is now free for OSI-licensed repos
Furwall
Furwall is a tiny macOS menu bar app. While you're at the keyboard or mouse, the FaceTime camera looks for a human face or upper body. When it doesn't find one, the keyboard stops accepting input. Cat walks across your laptop, nothing happens to your code. Some notes: Apple's Vision framework runs locally. Video is processed in memory and never uploaded. On a block, Furwall saves one local JPEG to ~/.furwall/catpures/. A second Vision pass throws out anything that isn't a cat, so the daily count in the menu only reflects confirmed cats. There is now a folder on my disk that is slowly filling up with photos of Pepper and Beets walking across my keyboard. The camera turns on only while you're at the computer (typing, mouse motion, app switch, screen wake) and powers down 30 seconds after the last activity. The green camera dot tracks that. The keystroke drop uses a CGEventTap at .defaultTap. Furwall ships unsandboxed because of this. A .listenOnly tap with Input Monitoring is enough to see keys, but dropping them needs .defaultTap, which needs Accessibility, which the App Sandbox blocks. Watching keystrokes is sandbox-compatible; stopping them is not. Mouse events are observed (to wake the camera) but never intercepted or dropped, so the menu bar always works. Three escape hatches: click the icon and quit, mash Escape five times in 1.5 seconds for a 5-minute pause, or revoke Accessibility in System Settings (macOS invalidates the tap). If Vision stalls for any reason the keyboard fails open after 10 seconds, which is better than soft-bricking the machine. Furwall never uploads camera frames or keystrokes. Its own network traffic is Sparkle update checks plus the donate sheet's anonymous totals/click counter. One short charity slug per click, no user identifier. The donate item in the menu opens the donate page of a vetted animal-welfare charity for your system Region. Ten orgs across nine regions: Alley Cat Allies and PetSmart Charities in the US, Cats Protection in the UK, Cat Protection Society NSW in Australia, Toronto Cat Rescue in Canada, NSPCA in Ireland, SPCA in New Zealand, Deutscher Tierschutzbund in Germany, La SPA and Fondation 30 Millions d'Amis in France, Japan SPCA in Japan. Each org is registered or recognized under its local charity or nonprofit regime, and the list gets re-vetted every release. No money flows through the app. macOS 15+, signed and notarized, MIT. https://olliewagner.com/furwall