Harmonic
Harmonic is a native Mac IDE for building with multiple AI agents.
What Harmonic is
Harmonic is a native Mac IDE for building with multiple AI agents. Each tab can run Claude Code, Codex, or DeepSeek, and separate tabs can keep agent sessions side by side in their own Git worktrees. Users can queue finished tabs to merge into a base branch, review conflicts inline, and open pull requests in one pass. The app connects multiple GitHub accounts and lets users choose an account for each repository. Users can select an agent and model per tab; switching agents mid-conversation is available on Pro. A keyboard command palette supports actions such as switching tabs, opening repositories, and shipping work. Harmonic requires macOS 11 or later and supports Apple Silicon and Intel Macs. The Free plan costs nothing, requires no card or account, and has no time limit. Paid options are $9 a month, $49 a year, or 79.00 USD once. Agent access and AI usage are not included; users provide their own plans and API keys. Harmonic says code never leaves the user’s Mac.
Good
- Free plan requires no card or account
- Separate tabs receive their own Git worktrees
- Connect multiple GitHub accounts
- Supports Apple Silicon and Intel Macs
Watch out
- Requires macOS 11 or later
- Agent access and AI usage are not included
- Switching agents mid-conversation is available on Pro
Who it suits
Harmonic suits Mac developers who want to run multiple coding agents in separate tabs and manage their worktrees and merges in one IDE. Users need their own agent plans and API keys.
Verdict
Harmonic combines parallel agent sessions with per-tab worktrees and a merge workflow. Its free plan has limits on repositories, tabs, and agents per chat, and using agents requires users’ own plans and API keys.
Plans and prices
From Harmonic's own pricing page, checked 8 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| Free | Free | Up to 2 repos · 5 tabs · One agent per chat · Forever |
| Monthly | $9 a month | Unlimited repos & tabs · Switch agents mid-chat · Merge train · Billed monthly. Cancel anytime. |
| Yearly | $49 a year | Everything in Pro · Use on all your Macs · Two months free vs monthly · Billed once a year |
| Lifetime | $79, paid once | Everything in Pro · No renewals · All future updates included · One payment. Yours forever. |
The facts
Each one read from Harmonic's own pages, with the date it was checked.
What it does
- Agent access
- Harmonic runs agent CLIs with users’ own plans and API keys; its license covers the app and does not include agent access.checked 8 Oct 2026
- GitHub
- Harmonic supports connecting multiple GitHub accounts and choosing an account for each repository.checked 8 Oct 2026
- Keyboard controls
- A command palette supports keyboard-first actions such as switching tabs, opening repositories, and shipping work.checked 8 Oct 2026
- Merge train
- Users can queue finished tabs for merging into a base branch, review conflicts inline, and open PRs in one pass.checked 8 Oct 2026
- Models
- Users can select an agent and model per tab and switch agents mid-conversation on Pro.checked 8 Oct 2026
- Parallel agents
- Each tab can run Claude Code, Codex, or DeepSeek, with multiple agent sessions running side by side.checked 8 Oct 2026
- Payments
- Checkout and billing are handled by Dodo Payments, and Harmonic says it does not see or store card details.checked 8 Oct 2026
- Privacy
- The pricing page states that users’ code never leaves their Mac.checked 8 Oct 2026
- Product
- Harmonic describes itself as a native Mac IDE for building with multiple AI agents.checked 8 Oct 2026
- Requirements
- The app requires macOS 11 or later and is a universal binary for Apple Silicon and Intel Macs.checked 8 Oct 2026
- Worktree isolation
- Harmonic gives each tab its own Git worktree on disk.checked 8 Oct 2026
Money
- Free access
- The Free plan requires no card or account, and can be used for as long as desired.checked 8 Oct 2026
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