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Harmonic
What it is
Harmonic is a native Mac IDE for building software with multiple AI agents. Each tab can run Claude Code, Codex, or DeepSeek, allowing several agent sessions side by side. Every tab receives its own Git worktree on disk. Finished tabs can be queued for merging into a base branch, with inline conflict review and pull-request creation in one pass. Users can connect multiple GitHub accounts and choose one for each repository. Each tab supports agent and model selection, while Pro adds switching agents during a conversation. A keyboard command palette handles actions such as changing tabs, opening repositories, and shipping work. Harmonic requires macOS 11 or later and is a universal binary for Apple Silicon and Intel Macs. It runs agent command-line tools with users’ own plans and API keys; AI usage is not included. The Free plan costs nothing forever, with paid plans at $9 a month, $49 a year, or $79, paid once. Harmonic says code never leaves the Mac.
For and against
For
- Runs Claude Code, Codex, and DeepSeek tabs
- Isolates each tab in a Git worktree
- Supports merge queues and inline conflict review
- Connects multiple GitHub accounts
- Free plan requires no card or account
Against
- Requires macOS 11 or later
- Agent access and AI usage are not included
- Free plan limits repositories and tabs
- Switching agents mid-chat requires Pro
The verdict
Harmonic organizes parallel AI coding sessions with per-tab worktrees and merge workflows. Its plans cover the app itself, while model access remains the user’s responsibility.
Who it suits
It suits Mac developers who want multiple coding agents organized across isolated Git worktrees. Users must bring their own agent plans and API keys.
Plans and prices
Free
Up to 2 repos · 5 tabs · One agent per chat
Read 8 Oct 2026 · harmonic.build
Monthly
Unlimited repos & tabs · Switch agents mid-chat · Merge train
Read 8 Oct 2026 · harmonic.build
Yearly
Everything in Pro · Use on all your Macs · Two months free vs monthly
Read 8 Oct 2026 · harmonic.build
Lifetime
Everything in Pro · No renewals · All future updates included
Read 8 Oct 2026 · harmonic.build
On the record
- Agent access
- Harmonic runs agent CLIs with users’ own plans and API keys; its license covers the app and does not include agent access.harmonic.build · read 8 Oct 2026
- Free access
- The Free plan requires no card or account, and can be used for as long as desired.harmonic.build · read 8 Oct 2026
- GitHub
- Harmonic supports connecting multiple GitHub accounts and choosing an account for each repository.harmonic.build · read 8 Oct 2026
- Keyboard controls
- A command palette supports keyboard-first actions such as switching tabs, opening repositories, and shipping work.harmonic.build · read 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.harmonic.build · read 8 Oct 2026
- Models
- Users can select an agent and model per tab and switch agents mid-conversation on Pro.harmonic.build · read 8 Oct 2026
- Parallel agents
- Each tab can run Claude Code, Codex, or DeepSeek, with multiple agent sessions running side by side.harmonic.build · read 8 Oct 2026
- Payments
- Checkout and billing are handled by Dodo Payments, and Harmonic says it does not see or store card details.harmonic.build · read 8 Oct 2026
- Privacy
- The pricing page states that users’ code never leaves their Mac.harmonic.build · read 8 Oct 2026
- Product
- Harmonic describes itself as a native Mac IDE for building with multiple AI agents.harmonic.build · read 8 Oct 2026
- Requirements
- The app requires macOS 11 or later and is a universal binary for Apple Silicon and Intel Macs.harmonic.build · read 8 Oct 2026
- Worktree isolation
- Harmonic gives each tab its own Git worktree on disk.harmonic.build · read 8 Oct 2026
