The best Hacker News stories from Show from the past day
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Show HN: Formally verified polygon intersection – Opus 4.8 oneshots, prev failed
To my knowledge, this is the first formally verified implementation of an intersection algorithm for polygons.<p>The experience of working with AI agents on this project changed a lot with recent model releases, as I describe in the readme. Opus 4.8 is able to provide algorithm implementation with formal proof in one shot, whereas previous models required me to provide proof strategies in multiple steps.<p>Trust in the correctness comes entirely from the Lean checker and human review of a small specification, not from the LLM.<p>Also check out the web demo built around the verified core linked in the readme: <a href="https://schildep.github.io/verified-polygon-intersection/" rel="nofollow">https://schildep.github.io/verified-polygon-intersection/</a>. It supports multipolygons including holes, self intersections, and overlapping edges.
Show HN: Prela – Purely Algebraic Relation Combinators
Prela is an embedded query language based on Tarski's Algebra of Relations. Its queries are concise, clear, and fast. It is implemented by shallow embedding in a host programming language: Prela operators are regular functions in the host. The implementation follows continuation-passing style which compiles to efficient columnar execution.
Show HN: FFmpeg WebCLI – Full FFmpeg in Browser, Offline PWA, No Uploads(WASM)
Built a browser-based FFmpeg editor that runs entirely client-side via WebAssembly. Your files never leave your device -- all processing happens in a Web Worker. Works offline as an installable PWA after first load.
Show HN: Boxes.dev: ditch localhost; run Claude Code and Codex in the cloud
Hi HN, we’re Nick and Drew, and we’re building boxes.dev – the first cloud-only agentic dev environment (ADE) that gives every Codex and Claude Code agent its own cloud computer.<p>We’re two engineers who previously built Gem (co-founder/CTO and first hire), and we spent the last year coding almost exclusively using Codex and Claude Code. It’s been a huge change to how we code, and it’s been exhilarating seeing the models keep getting better – but we eventually realized that developing on localhost was holding us back:<p>- Git worktrees are clunky to set up and use for parallelizing work
- It’s 2026, but somehow everyone is still walking around with laptops cracked open or SSHing into mac minis in their garage so their agents don’t stop working.
- Mobile is treated like an afterthought even though coding is just texting now
We started hitting resource constraints when multiple parallel agents test their own work by running the full app locally.
- We tried different products, but couldn’t find any that solved all of our pain points – so we pivoted and decided to just build the ADE we wanted for ourselves.<p>Boxes.dev is a desktop and mobile app that lets you run Claude Code, Codex (using your subscription!), and the full dev environment for whatever you’re building, all on remote compute. It’s similar to Conductor or the Codex desktop app, except everything is in the cloud.<p>We use coding agents to scan your local dev setup and port it to the cloud. Then every Claude Code/Codex thread starts from a snapshot of the full setup, with its own filesystem and compute.
No more git worktrees, no more cracked-open laptops, and your coding agents can actually test their work end-to-end because they can run your full app in isolation.<p>We’ve mirrored the Claude Code and Codex UX to feel natural to power users, and also have a fully-featured mobile app (no handoffs or remote control), plus scheduled automations and a Slack integration.<p>We’re obviously biased, but we’ve been building boxes.dev with boxes.dev for months and it’s honestly been a gamechanger. It’s hard to go back once you realize how much localhost has been limiting you; based on early feedback from beta testers, we’re increasingly sure that cloud is the future of agentic coding.<p>We’d love for you to experience it yourselves! Would appreciate any feedback – and happy to answer any questions on this thread.
Show HN: Uruky (EU-based Kagi alternative) now has Image Search and URL Rewrites
You can get a 2h free trial by solving a proof-of-work captcha when topping up your account for the first time.<p>If you'd like to learn more, an independent interview was posted a couple of weeks ago [1], and the FAQ [2] has a lot of information as well.<p>For the source code sharing, we've talked with lawyers and are inclined to no longer require the NDA/NCC for privacy reasons shared with us before (signing requires identification), but instead use a source-available permissive license that doesn't allow competition, like PolyForm Shield [3] (we do still have about 6 months before finalising a decision, here).<p>This does come with a lot more risks for us (it's harder to track down if someone publishes the code or uses it against the license), but given we've already passed 100 monthly active accounts, we're feeling more confident it's an acceptable risk.<p>The plan is to give logged in accounts (who are 12 months old or more) a way to download a ZIP of the current code base that's in the server.<p>Obviously there's no easy way to prove that's the case, but we're open to ideas/suggestions if someone here has them.<p>[1]: <a href="https://theprivacydad.com/interview-with-the-engineer-of-uruky-a-private-search-engine/" rel="nofollow">https://theprivacydad.com/interview-with-the-engineer-of-uru...</a><p>[2]: <a href="https://uruky.com/faq" rel="nofollow">https://uruky.com/faq</a><p>[3]: <a href="https://polyformproject.org/licenses/shield/1.0.0" rel="nofollow">https://polyformproject.org/licenses/shield/1.0.0</a>
Show HN: Rscrypto, pure-Rust crypto with industry leading public benches
Show HN: Tired of duct-taping access control into agent prompts. Here's the fix
Show HN: Mnemo – local-first AI memory layer for any LLM (Rust, SQLite,petgraph)
Show HN: Ideogram 4.0 – open-weight 9.3B text-to-image model
It's our new text-to-image model: a 9.3B single-stream diffusion transformer trained entirely from scratch.<p>We focused heavily on controllability through structured JSON prompts, with strong text rendering, spatial awareness through bounding box guidance, and color palette control.<p>It has the best text rendering of any open-weight model we've tested so far, and the NF4 quantized checkpoint runs on a single 24GB GPU.<p>For more technical details and examples see our blog post: <a href="https://ideogram.ai/blog/ideogram-4.0/" rel="nofollow">https://ideogram.ai/blog/ideogram-4.0/</a><p>We will be happy to answer any questions :)
Show HN: Ideogram 4.0 – open-weight 9.3B text-to-image model
It's our new text-to-image model: a 9.3B single-stream diffusion transformer trained entirely from scratch.<p>We focused heavily on controllability through structured JSON prompts, with strong text rendering, spatial awareness through bounding box guidance, and color palette control.<p>It has the best text rendering of any open-weight model we've tested so far, and the NF4 quantized checkpoint runs on a single 24GB GPU.<p>For more technical details and examples see our blog post: <a href="https://ideogram.ai/blog/ideogram-4.0/" rel="nofollow">https://ideogram.ai/blog/ideogram-4.0/</a><p>We will be happy to answer any questions :)
Show HN: Paseo – Beautiful open-source coding agent interface
Repo: <a href="https://github.com/getpaseo/paseo" rel="nofollow">https://github.com/getpaseo/paseo</a><p>Homepage: <a href="https://paseo.sh/" rel="nofollow">https://paseo.sh/</a><p>Discord: <a href="https://discord.gg/jz8T2uahpH" rel="nofollow">https://discord.gg/jz8T2uahpH</a>
Show HN: Nutrepedia – Nutrition info in 29 locales built with Clojure and Htmx
Show HN: Nutrepedia – Nutrition info in 29 locales built with Clojure and Htmx
Show HN: I reverse-engineered the world maps of Test Drive III (1990 DOS game)
Show HN: I reverse-engineered the world maps of Test Drive III (1990 DOS game)
Show HN: Edsger – A handwritten Clojure REPL for the reMarkable 2
Show HN: Edsger – A handwritten Clojure REPL for the reMarkable 2
Show HN: Synapse – 2.9MB Mac app with screenshot, clipboard, Keep Awake and more
Show HN: A free Linux adaptation of NETworkManager by BornToBeRoot
Show HN: Live breath detection and biofeedback from a phone microphone
Hi everyone, I am Felix, a famliy doctor from ZH, Switzerland.
A couple of month ago I started this little project called
shii • haa, a breathing app that uses the phone`s microphone
for live biofeedback<p>My prior work in emergency medicine and intensive care was
closesly linked to breathing, mostly in critical situations...
and let me to reevaluate my own way of breathing. over time
one question popped into my mind: can medical knowledge and
biofeedback make an app actually promote self-awareness instead
of attaching your goals to the award system of the app.<p>it combines signal processing, a breathing state machine and ML.
The state machine follows inhale, exhale and transitions in the
mic signal. A quality layer rejects noisy or ambiguous windows
before signals are used for feedback. All processing is done
on-device, no speech or raw audio is uploaded.<p>What I'm trying to avoid is turning breathing into another score
or game. The app gives feedback on rhythm, depth and regularity,
but the point is more "notice what you are doing" than "perform
well".<p>I'd be interested in feedback, especially from people who have
worked on signal processing, health UX, or Android/iOS audio
issues.