The coding agent you own.

Open source and runs on your machine with any model. It double-checks every bug before showing you.

It finds the cause, makes the change, writes a test, and runs it.

Real sessions, replayed in Aster's own interface. Click around, it's the real thing.

lines of Rust
100K
releases shipped
15
places to use it
6
downloads
680+

Runs in the terminal, the desktop app, VS Code, Zed, the browser, and Telegram.

One agent for every coding job. Ask, edit, review, and fix, all on your own machine.

Reviews that only report real bugs

A cheap model lists every possible bug. A stronger model then tries to prove each one wrong. Only the bugs that survive reach your pull request.

Talk to your code

Ask how something works, then let Aster make the change. It can write a plan first and wait for your approval.

  • where does the retry logic live?answered
  • add a test for the empty input caseedited
  • why is that finding critical?explained

You decide how far it goes

Simple rules for what it may read, edit, and run. Every command runs in a sandbox, so your secrets stay hidden.

It remembers how you work

Aster keeps notes about your project and loads them only when they help. Eighteen skills come built in, and tools made for other agents through the open Agent Skills, Agent Plugins, and MCP standards install as they are.

Project memory 18 built-in skills Agent Plugins MCP servers
Aster Cloud

The same agent, run for your whole team. Using Aster on your own stays free forever.

  1. Q4 2026

    One key, every model

    Every major model through one account and one bill, at cost or as a flat monthly bundle.

    In progress
  2. Q1 2027

    Hand it an issue, get a pull request

    Start Aster from a GitHub issue, Slack, or a schedule. It works in a safe cloud machine and opens a checked pull request.

    Planned
  3. Q2 2027

    Shared for the whole team

    One place for your team's skills, rules, and memory, with single sign-on, audit logs, and spending limits.

    Planned
  4. Q2 2027

    Pick up anywhere

    Sessions follow you from terminal to desktop, editor, and phone, with the full history and what each task cost.

    Planned

Free for you. Paid for teams, when Aster Cloud opens.

Open source

For anyone, on their own machine

$0forever

Available now

  • The full agent, everywhere it runs
  • Your own key or a local model
  • Apache-2.0, sends nothing home
Install free

Pro

For people who want it to just work

$20/mo

Everything in Open source, plus

  • Model credits included
  • Sessions synced across devices
  • A few background agents
Join early access

Team

For teams that review together

$25/person/mo

Everything in Pro, plus

  • Shared skills, rules, and memory
  • One bill with spending limits
  • Background agents for the team
Join early access

Enterprise

For companies with policy needs

Custom

Everything in Team, plus

  • Single sign-on and audit logs
  • Private cloud or self-hosted
  • Policy control and support
Join early access

Paid plans are not open yet. Model usage and background agents are billed on top of a plan.

Try Aster today. Free, open source, and your model.

View on GitHub

Then run aster in any project. It asks how to connect the first time.