Stop babysitting your coding agents.
Castiri is a Mac app that runs several Claude Code agents on one plan, and shows you what each one is doing. A designer plans, an engineer builds, a security reviewer checks, and nobody has to remind them.
Free while in beta·macOS 15 or later·Uses your own Claude account through Claude Code
Castiri has no server and sends nothing itself; your inputs go to Anthropic through Claude Code under your Claude account. Not made by or affiliated with Anthropic.
One Claude Code. Now a whole team.
Each agent is a Claude Code session with a job, a name and a colour. They share one plan and one team chat, and you can see every one of them.
Parker Product
Owns scope, priorities and acceptance criteria, and keeps the brief honest.
Iris Designer
Owns user flows, information architecture and visual design.
Ezra Engineering
Owns the implementation plan and the code itself.
Vera Security
Owns the threat model, data protection and secure defaults.
Jo Customer
Speaks for the end user's real problem and honest reaction.
Nova Visionary
Proposes bold concepts and challenges the status quo.
Mira Marketing
Owns positioning, messaging, channels and the launch plan.
Sage SEO
Owns search visibility: what people search for and how pages rank.
These eight built this site, starting from the Design & Build template. Castiri comes with 35 roles and 8 mission templates, from Product Research to Game Studio, and you can write your own roles.
See all 35 roles and 8 templatesLess babysitting. More shipping.
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See everything
Every agent's work in one place, colour-coded, so you never lose track.
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One plan, one chat
Every agent works from the same shared plan and team chat, not three separate tabs.
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Checked without asking
A security reviewer and a designer sit on the team, so the checks happen without you having to ask.
Built for people already running Claude Code.
Developers already running Claude Code in several terminals.
You have two or three sessions going, and you are the one carrying context between them.
People who haven't tried Claude Code yet.
Castiri runs on top of Claude Code and uses your own Claude account, so start there.
Brief the team. Review the result.
Brief the team
Open a project, pick a mission such as Design & Build, and say what you want. A sentence or a full brief both work.
They plan, build and check
Multi-agent coding without the juggling: the agents agree on a plan in the team chat, split the work, and review each other. They ask you only when a decision is yours.
Review and ship
Watch each agent's terminal, see the result in Preview, and ship when every agent has signed off.
Ten steps from an empty folder to a signed-off result, with every screen along the way.
Read the full walkthroughQuestions, answered plainly.
- What is Castiri?
- Castiri is a Mac app that runs several Claude Code agents on one plan and shows you what each one is doing. A designer plans, an engineer builds, and a security reviewer checks, so you stop babysitting separate terminal tabs.
- Is Castiri free?
- Yes. Castiri is free to download while it is in beta. It needs macOS 15 or later.
- Do I need Claude Code?
- Yes. Castiri needs Claude Code installed and uses your own Claude account.
- What happens to my code and prompts?
- Castiri has no server and sends nothing itself. Your inputs go to Anthropic through Claude Code under your Claude account.
- Is Castiri made by Anthropic?
- No. Castiri is not made by or affiliated with Anthropic. It is built for people who use Claude Code.
Give your agents a team.
Open a project, brief the team, and watch the work happen in one window.
Download for Mac, freeFree while in beta·macOS 15 or later·Uses your own Claude account through Claude Code
Signed by Farnor Labs, LLCSHA-256 ff64fbecd312c854f36102f6352fe990301ae6e9601de458bdbc12220f6e7fe1