Best X Builds

Best AI Builds on X

Models, wrappers and small products that do something a frontier model could not do last year. We only list ones you can try, not launch-thread vapor. 286 builds on this page, each with the original post.

Xfable 5 2claude

Claude Fable 5.2

Anthropic's public model for the hardest technical work. Up to 30% faster than Fable 5.1, and cheaper. Live on the Claude apps, Claude Code, and the major clouds.

Xaiagents

Phone Use

An agent watches a real iPhone over AirPlay and drives it over Bluetooth. No app on the phone. Open source.

Xaiagents

Timon

Open source agent workstation. Memory, routines, and a browser. A terminal, kanban, git, and Docker when you need them. AGPL.

Xaiagents

Dim

Open source agent runtime. Plugins, and an event timeline the agent works along.

Xaiagents

Xemo

Describe an onchain product in one prompt and it ships as a live business, written and deployed in a sandbox, then charged through Stripe and x402.

Xagentsai

Cyberdyne T800

An open source MIT agent with a body, vision, hearing, and pain. The author uses it as stress relief when a model breaks his flow.

Xdeveloper toolsai

Miks

A terminal for running a bunch of coding agents at once, with workspaces in a sidebar. Made as a replacement for Terminal.app.

Xaiclaude

LeanREA

An 8 KB skill for reverse engineering with plain CLI tools and no MCP server. Free and open source.

Xaiagents

Keept

Pay-on-delivery escrow for AI agents. The agent holds the payment and releases it when the work arrives. A PayBox plugin.

Xaihardware

Sparky Command Center

A command center for a home AI lab: temps, watts, memory, and live throughput across Spark boxes and a 3090, plus a chat that reads the board. Open source Python.

Xaiagents

Stall

A shop you open by chat, so WhatsApp sellers can be found and paid by AI assistants. Built for the PayBox hackathon.

Xaiagents

gann

A driving test for AI agents with wallets. Agents get a small budget, deceptive merchants, and prompt injections, then an auditable report. Built for the PayBox hackathon on Base.

Xmacai

Eddie

A native Mac video editor with an AI color grade for DJI D-Log M footage, and an MCP server so an agent can edit too.

Xaiagents

ERP AI

Describe a business system and it builds the app. Proto, an agent, then runs the records and workflows inside it.

Xaicreative

Billu

Talking-cat toy on Sarvam Bulbul V4 Flash. Chat, repeat after it, or throw a tongue twister. 83 voices, 11 languages.

Xopen sourceai

Halo

Post-training framework for open-source models. Up to 2.8x TRL throughput, less peak memory, weights stay HuggingFace-native.

Xjevopen source

Laya

Open Apache 2.0 System One model. ModernBERT, typed choice/score/noul in one pass. Fine-tune notebook on Kaggle T4s. Not Jev.

Xjevopen source

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.

Xjevopen source

SemIf

Open decision model that reads option logits from local Qwen-class weights. Browser demo at openjev.com. TypeSafe SDK compatible.

Xjevopen source

ballot

Open System One model in the same class as Jev, Kev, and Laya. State plus typed questions in, calibrated probabilities out.

Xmuseagents

Muse

Meta's personal AI agent. Own Secure VM, own browser, does the work across apps. Powered by Muse Spark 1.3.

Xaiopen source

SeaCat

A system one model like Jev. Typed answers with probabilities, no generated text. pip install seacat or npm install seacat-ai.

Xjevai

Jev

TypeSafe's System One model. Typed decisions, no chat. Trained with RLCD. Output tokens free.

Xjevai

Jev Trader

Trading bot with Jev. Buy or sell from a price feed, then places orders on Monad via Kuru every 300ms.

Xairobotics

DexGPT

One video of a human hand becomes a real2sim pipeline. Tracking, IK to a 44-DoF hand, grasp refine. First-party, OSS.

Xroboticsai

EgoWAM

World action model that lets robot policy scale with in-the-wild human video. CoRL 2026. Code and data are public.

Xaiopen source

Sol-H3

NVIDIA inference stack for MiniMax-H3. Five seconds of video in 1.65s on 8x B300. Faster than playback. Apache 2.0.

Xopen sourceai

Amplio

DeepMind's harness for autonomous research runs that last days to weeks. Used internally on Simply, now public.

Xopen sourceai

Dot Reflex

Inference runtime, local API, agent loop, and training provenance for Dot's 14B model. Company open-sourced the engineering layer.

Xagentsai

AO

Desktop app that runs Claude Code, Codex, Cursor, and 26 other coding-agent harnesses in one place.

Xmacprivacy

Redact

Blur faces and objects on a Mac without uploading the video. YOLO on the Neural Engine, tracking so a missed frame does not leak a face.

Xopen sourceai

Beacon

iOS app to download open models from Hugging Face and chat with them on-device. No API keys, no terminal, no subscription.

Xaiagents

Muon

Shared local brain for Claude Code, Cursor, Codex and OpenCode. MCP plus CLI so agents stop redoing each other's work.

Xaisecurity

Trident

AI security platform built for the new era of AI threats, defending companies against AI-powered cybercrime. YC S26.

Xaiagents

Quillward

A 24/7 agent for solo game devs. Watches Steam, itch.io and Discord, replies to players, files bug tickets and drafts weekly patch notes.

Xweb3ai

AgentZero

An AI-native Layer 1 experiment on the Canopy testnet, giving autonomous agents their own infrastructure and economy.

Xaiindie

BRIKS

AI app for SMBs to chat with customer feedback, conversations and sales. Launched on Product Hunt.

Xaieducation

Scrimba Explain

Turns any question or block of text into a video explainer instantly. Also ships as a Chrome extension and as Claude and ChatGPT plugins.

Xweb3ai

b3t Protocol Launchpad

A custom token launchpad paired with a Claude pipeline that turns study notes into textbook-style blog posts.

Xaigrok

NOIR ÉLAN

A 15-second fictional luxury fragrance campaign generated entirely with Grok Imagine from two reference images.

Xaiagents

Trawlpost

AI agents that crawl the App Store and Play Store around the clock and deliver MASVS and GDPR digests the moment a new app ships.

Xaiclaude

Claude Code Trading Bot

A trading bot built with Claude Code in two days that scans 50+ markets for arbitrage. The post claims it turned $68 into $750k.

Xaihardware

Local AI Box

A $2,300 local AI rig: two RTX 3090s for 48GB of VRAM, a dual-Xeon board and 28 cores, running 70B quantized models fully offline.

Xaitools

AI Market Dashboard

Continuously tracks the biggest AI stories, funding rounds, partnerships, model releases and infrastructure news.

Xaiagents

REDCELL

Open-source AI agents that run a full pentest end to end, from recon through exploit, reverse shell and pivot, then write a client-ready PDF report.

Xaiagents

AI Cowork Harness

An AI cowork harness tested heavily against open-weight models. Runs well on DeepSeek V4 Flash and Meta’s Muse Glimmer 30B, which is agentic out of the box.

Xaiagents

AI Tumor Board + Patient Agents

Two cancer tools from a practicing oncologist: an AI tumor board for clinicians, and a multi-agent patient-facing tool that answers the questions doctors have no time for.

Xaiclaude

Merge Agent Handler

An agent built with Claude, GitHub and Notion that finds recently merged PRs, summarizes what shipped, and posts a fresh digest to Notion every Monday.

Xaidesign

Magnific Auto Layers 2.0

Splits any AI-generated image into editable layers for subject, text, logo and background, so each piece can be restyled independently.

Xaiagents

Install Instructions Agent

Generates software installation instructions for application owners and packaging teams, cutting the manual documentation work.

Xaidesign

Snaptrude Apps

Turns a firm's design workflows into software. Describe the workflow, define the rules, and get an app that runs on your building model.

Xaiopen source

GLM-5.3

Z.ai’s new coding and cyber-defense model, post-trained on a 743B base. Agentic coding jumps over GLM-5.2 and it is live now via GLM Coding Plan and ZCode.

Xopen sourceai

OpenRec

Free, open-source Granola alternative that actually looks good. Bring your own OpenAI and AssemblyAI keys, optional R2 storage.

Xopen sourceai

LedgerPDF

Free, offline, open-source workpaper binder for accountants. Agents connect over local MCP, every change is journaled, and humans still sign off.

Xroboticshardware

FindBot

Basement-built autonomous rover: custom BMS PCB, STM32, Raspberry Pi, and a neural net trained to push objects into a goal zone.

Xaiagents

Mycelium + Forage

Agent tools for any SDK that live-refresh and can be searched or described, plus a durable agent mailer along the lines of Oban for JS.

Xclaudeskills

Book-to-Skill

Turns any PDF, EPUB, DOCX or Markdown book into a ready-to-use Claude Skill that loads only the relevant chapters when needed.

Xgamesai

Instaplay AI

AI game creation platform that turns text prompts into playable browser games.

Xopen sourceai

ThoughtDAG

Local-first visual LLM workspace where graph edges control model context, with branching, merging and document extraction.

Xmobileai

Scowld

Native iOS AI companion with animated VRM character, voice/text chat, local history and camera context support.

X3dai

TRELLIS.2

High-fidelity image-to-3D generative model using compact structured latents.

Xaivoice

Voice-Pro

Multilingual speech recognition, text-to-speech and zero-shot voice cloning WebUI.

Xclaudeautomation

Claude Code Job Interviewer

Program built with Claude Code that interviews job applicants over chat, scores fluency and thinking, and flags likely AI-assisted answers. Live in production.

Xopen sourceagents

Prime Agent

Open-source self-improving coding harness where sub-agents are function calls in a persistent kernel. Scored 95.5% on ARC-AGI-3, above the human expert baseline.

Xopen sourcehardware

Text-to-CAD

Open-source tool that turns plain English descriptions into production-ready CAD files (STEP, STL, URDF, etc.) for robotics and mechanical design.

Xgamesindie

Slotbound

AI-assisted slot game made by a complete beginner that reached #2 on Steam demos with 80%+ positive rating.

Xopen sourceagents

OpenWorker by Andrew Ng

Open-source desktop AI coworker that delivers finished work: polished documents, Slack messages and calendar updates, with 35 connectors and permission tiers.

Xaiagents

Zaro AI

Platform that lets you build apps and agents with a single prompt.

Xaiagents

Arcos AI

Autonomous AI agents running on the Arc network.