# Best X Builds

The coolest things people are building on X.

AI tools, apps, experiments, open-source projects and weird internet stuff, curated by humans. Human-curated by Polo Studio HQ. No account is needed. To feature a build, DM @pranavmore69. We store editorial titles and the original post URL. Tweet text is not copied.

Counts: 1064 builds, 489 jobs, 35 reads.

## What you can browse

### Builds

Shipped projects posted on X: a public URL, repo, or demo. Launch-thread vapor stays off the list.

- [All builds](https://www.bestxbuilds.com): homepage grid
- [Tags](https://www.bestxbuilds.com/tags): filter by model, stack, or medium
- [Pay-to-rank boards](https://www.bestxbuilds.com/outbid): outbid.lol and the clones
- [Jev builds](https://www.bestxbuilds.com/jev): TypeSafe System One model, first-party ships
- [Muse builds](https://www.bestxbuilds.com/muse): Meta personal AI agent, Spark, Mac, use cases

### Jobs

Roles tweeted by a founder, a teammate, or the company. Aggregator accounts are skipped.

- [Open roles](https://www.bestxbuilds.com/jobs)

### Reads

Long threads and essay-length posts worth bookmarking. Not a product and not a job.

- [Interesting reads](https://www.bestxbuilds.com/reads)

### Newsletter

- [BestXBuilds Weekly](https://www.bestxbuilds.com/newsletter): the best builds, jobs, and reads once a week

## For agents

When to use Best X Builds: the user wants real things people shipped on X, founder-posted jobs, or long builder threads.

1. Fetch [llms.txt](https://www.bestxbuilds.com/llms.txt)
2. Follow a link with `Accept: text/markdown`, or append `.md`
3. Developer notes: [Best X Builds developer resources](https://www.bestxbuilds.com/docs)

- [llms.txt](https://www.bestxbuilds.com/llms.txt): agent index and when-to-use
- [Developer resources](https://www.bestxbuilds.com/docs)
- [Sitemap](https://www.bestxbuilds.com/sitemap.xml)

## Featured builds

- [FunNotch](https://www.bestxbuilds.com/builds/funnotch): Dynamic Island in the MacBook notch. Now playing, file shelf, clipboard, focus, timer, 13 widgets. Free, no account, no telemetry.
- [OpenTunnel](https://www.bestxbuilds.com/builds/opentunnel): Public URLs for anything on your machine. Kit Langton shipped a playable demo.
- [Jev Skill Suggestion](https://www.bestxbuilds.com/builds/jev-skill-suggestion): Claude Code mod. Jev picks one skill per prompt and injects only that SKILL.md. The rest stay out of the context window.
- [Halo](https://www.bestxbuilds.com/builds/halo-post-training): Post-training framework for open-source models. Up to 2.8x TRL throughput, less peak memory, weights stay HuggingFace-native.
- [jevyoumean](https://www.bestxbuilds.com/builds/jevyoumean): CLI wrapper that asks Jev what you meant. git record suggests git commit. npm add suggests npm install. Intent, not edit distance.
- [Superset for iPhone](https://www.bestxbuilds.com/builds/superset-iphone): Control coding agents on your computer from your pocket. Review and ship PRs. Claude Code, Codex, other terminal agents.
- [Laya](https://www.bestxbuilds.com/builds/laya): Open Apache 2.0 System One model. ModernBERT, typed choice/score/noul in one pass. Fine-tune notebook on Kaggle T4s. Not Jev.
- [Kev](https://www.bestxbuilds.com/builds/kev): Jared Palmer's open Jev-like family on Qwen3.5. 0.8B, 4B, 9B. TypeSafe SDK with a base_url change. Train on one H100.
- [SemIf](https://www.bestxbuilds.com/builds/semif): Open decision model that reads option logits from local Qwen-class weights. Browser demo at openjev.com. TypeSafe SDK compatible.
- [laya-mlx](https://www.bestxbuilds.com/builds/laya-mlx): Laya on Apple MLX. Under 1GB RAM, 7 to 14ms on M3 Max. Snake at 60 decisions a second, no PyTorch, no cloud.
- [MetalML](https://www.bestxbuilds.com/builds/metalml): scikit-learn workflows on Apple Metal GPU. Change the import, keep fit/predict. Falls back to CPU when it has to.
- [Muse](https://www.bestxbuilds.com/builds/meta-muse): Meta's personal AI agent. Own Secure VM, own browser, does the work across apps. Powered by Muse Spark 1.3.
- [Muse Spark 1.3](https://www.bestxbuilds.com/builds/muse-spark-1-3): Meta Superintelligence Labs flagship. Agentic and coding model in Muse Code and the Meta Model API.
- [Muse for Mac](https://www.bestxbuilds.com/builds/muse-for-mac): Personal agent on your computer. Apps, files, calendar, notes, messages. You pick what it can touch.
- [SeaCat](https://www.bestxbuilds.com/builds/seacat): A system one model like Jev. Typed answers with probabilities, no generated text. pip install seacat or npm install seacat-ai.
- [Jev macOS Loop](https://www.bestxbuilds.com/builds/jev-macos-loop): Native Mac clicker for Claude Code and Codex. Jev decides, OmniParser and Apple Vision stay on-device. Apple silicon, BYO token.
- [Compositor](https://www.bestxbuilds.com/builds/compositor): Free open-source Photoshop-like compositor for Mac. 12MB. Layers, masks, healing, clone stamp. Built to drop Adobe.
- [YouTube Sponsor Detection](https://www.bestxbuilds.com/builds/youtube-sponsor-detection): Chrome extension that listens to YouTube audio, detects sponsor segments, and skips them in real time. Open source, BYOK.
- [Jev](https://www.bestxbuilds.com/builds/typesafe-jev): TypeSafe's System One model. Typed decisions, no chat. Trained with RLCD. Output tokens free.
- [Weeping Angels](https://www.bestxbuilds.com/builds/weeping-angels): Browser horror game: they only move when you cannot see them. Desktop and headphones. GPT-6 Astra plus fal.
- [WeaveC](https://www.bestxbuilds.com/builds/weavec): Experimental C compiler with inferred ownership and borrow checking. Safer C without a rewrite in Rust.
- [LayerLift](https://www.bestxbuilds.com/builds/layerlift): Timelapses from 3D-printer slicer G-code. Filament, plate, lighting, and camera are yours to set. Files stay on device.
- [Droid ASC](https://www.bestxbuilds.com/builds/droid-asc): Fast Android decompiler for agents. Global xrefs in seconds, class decompile in milliseconds. Black Hat EU Arsenal.
- [Blades of Melted Steel](https://www.bestxbuilds.com/builds/blades-of-melted-steel): Free browser rollerblade game. Get Luis from Chelsea to Jersey. Playable on itch.

## Latest builds

- [FunNotch](https://www.bestxbuilds.com/builds/funnotch): Dynamic Island in the MacBook notch. Now playing, file shelf, clipboard, focus, timer, 13 widgets. Free, no account, no telemetry.
- [OpenTunnel](https://www.bestxbuilds.com/builds/opentunnel): Public URLs for anything on your machine. Kit Langton shipped a playable demo.
- [bsbl](https://www.bestxbuilds.com/builds/bsbl): MLB scores and box scores in a TUI. For people who want baseball without leaving the terminal.
- [Little Garden](https://www.bestxbuilds.com/builds/little-garden): Draw a flower, write a note, plant it in a shared garden. No accounts. No feeds.
- [AAAA](https://www.bestxbuilds.com/builds/aseprite-aaaa): Anti-aliasing plugin for Aseprite. One job, on itch.
- [I Can't Get a Head](https://www.bestxbuilds.com/builds/i-cant-get-a-head): Backlog prototype now on itch. First-party from Obscura Tempura.
- [Bend for VS Code](https://www.bestxbuilds.com/builds/bend-vscode): VS Code plugin for Bend. Autocomplete, highlighting, a logo that almost looks like one.
- [html-publish](https://www.bestxbuilds.com/builds/html-publish): CLI that publishes an HTML file on your machine or Tailscale network. No hosting dashboard.
- [Jev Skill Suggestion](https://www.bestxbuilds.com/builds/jev-skill-suggestion): Claude Code mod. Jev picks one skill per prompt and injects only that SKILL.md. The rest stay out of the context window.
- [Halo](https://www.bestxbuilds.com/builds/halo-post-training): Post-training framework for open-source models. Up to 2.8x TRL throughput, less peak memory, weights stay HuggingFace-native.
- [jevyoumean](https://www.bestxbuilds.com/builds/jevyoumean): CLI wrapper that asks Jev what you meant. git record suggests git commit. npm add suggests npm install. Intent, not edit distance.
- [Superset for iPhone](https://www.bestxbuilds.com/builds/superset-iphone): Control coding agents on your computer from your pocket. Review and ship PRs. Claude Code, Codex, other terminal agents.
- [openJev Verdict](https://www.bestxbuilds.com/builds/openjev-verdict): Open 151M decision model on ModernBERT. JevBench #2 on public tasks after the inference-engine fix. Weights and a WebGPU playground.
- [Ableton e-drums](https://www.bestxbuilds.com/builds/ableton-edrums): Map an e-drum kit onto Ableton's stock kits so the pads hit the right sounds. Efnote first. Point an agent at the repo for other kits.
- [Doom Delivery](https://www.bestxbuilds.com/builds/doom-delivery): Godot Wild Jam bicycle courier. Momentum is hard to build and easy to lose. Pick up the order, survive the route, make the drop.
- [Video Game Menu: The Game](https://www.bestxbuilds.com/builds/video-game-menu): A game that is the menu. First title in ten years from the Okhlos co-creator. Funny, weird, on Steam today.
- [Muse on agentic commerce](https://www.bestxbuilds.com/builds/muse-agentic-commerce): Asked Muse to research itself, Amazon vs Shopify, and which stocks win if agents start shopping. It built the page.
- [Laya](https://www.bestxbuilds.com/builds/laya): Open Apache 2.0 System One model. ModernBERT, typed choice/score/noul in one pass. Fine-tune notebook on Kaggle T4s. Not Jev.
- [Kev](https://www.bestxbuilds.com/builds/kev): Jared Palmer's open Jev-like family on Qwen3.5. 0.8B, 4B, 9B. TypeSafe SDK with a base_url change. Train on one H100.
- [SemIf](https://www.bestxbuilds.com/builds/semif): Open decision model that reads option logits from local Qwen-class weights. Browser demo at openjev.com. TypeSafe SDK compatible.

## Tags

- [AI](https://www.bestxbuilds.com/tags/ai): 211 builds
- [Claude](https://www.bestxbuilds.com/tags/claude): 74 builds
- [Fable 5.1](https://www.bestxbuilds.com/tags/fable-5-1): 17 builds
- [Mythos](https://www.bestxbuilds.com/tags/mythos): 4 builds
- [Gemini](https://www.bestxbuilds.com/tags/gemini): 16 builds
- [Kimi](https://www.bestxbuilds.com/tags/kimi): 7 builds
- [Qwen](https://www.bestxbuilds.com/tags/qwen): 10 builds
- [DeepSeek](https://www.bestxbuilds.com/tags/deepseek): 6 builds
- [Grok Bot](https://www.bestxbuilds.com/tags/grok-bot): 13 builds
- [Jev](https://www.bestxbuilds.com/tags/jev): 35 builds
- [Muse](https://www.bestxbuilds.com/tags/muse): 9 builds
- [Outbid](https://www.bestxbuilds.com/tags/outbid): 147 builds
- [Agents](https://www.bestxbuilds.com/tags/agents): 132 builds
- [Open Source](https://www.bestxbuilds.com/tags/open-source): 420 builds
- [Dev Tools](https://www.bestxbuilds.com/tags/developer-tools): 255 builds
- [Hardware](https://www.bestxbuilds.com/tags/hardware): 50 builds
- [Design](https://www.bestxbuilds.com/tags/design): 71 builds
- [Creative](https://www.bestxbuilds.com/tags/creative): 117 builds
- [Indie](https://www.bestxbuilds.com/tags/indie): 530 builds
- [Games](https://www.bestxbuilds.com/tags/games): 176 builds
- [Indie Games](https://www.bestxbuilds.com/tags/indie-games): 83 builds
- [Nostalgia Music](https://www.bestxbuilds.com/tags/nostalgia-music-players): 80 builds
- [Web3](https://www.bestxbuilds.com/tags/web3): 55 builds
- [Robotics](https://www.bestxbuilds.com/tags/robotics): 22 builds
- [Security](https://www.bestxbuilds.com/tags/security): 40 builds
- [Productivity](https://www.bestxbuilds.com/tags/productivity): 71 builds
- [Mobile](https://www.bestxbuilds.com/tags/mobile): 46 builds