Leon vs Cursor.
Checked 2026-10-07. Sources below.
Cursor site: cursor.com
Cursor 3 is a full editor rebuilt around an Agents Window: parallel agents across local, cloud, worktree and SSH, diffs view, /best-of-n and Design Mode. Leon is not an IDE. It is the workspace beside your editor that runs any agent CLI in parallel, with a built-in file editor for reading and quick edits. Choose Cursor if you want agents inside your editor with cloud VMs. Choose Leon if you want one fast surface for every agent, whatever editor you keep.
The table.
Leon: Rust, GPU-rendered UI, 23 to 27 MB download, macOS, Linux, Windows, Apache-2.0, open source.
| LEON | CURSOR | |
|---|---|---|
| What it is | Native workspace for running coding agents in parallel. Rust, GPU-rendered, a 23 to 27 MB download. | AI-native code editor. Cursor 3 replaces Composer with an Agents Window for parallel agents across repos and environments. |
| Agent support | 43 built-in terminal agents plus custom agents. History search for Claude Code, Codex and opencode. | Cursor agent with curated models, plus worktree and CLI flows. Multi-model comparison via /best-of-n. Editor-centric, not agent-neutral. |
| Isolation | One tree for every session: projects, worktrees and machines side by side. Resume, no dupes, history, lights. | Worktrees via /worktree and --worktree, plus cloud agents on dedicated VMs with their own clone and branch. |
| Terminals | Real terminals, split your way, with buffer and live output. | Full editor terminals and panes. Heavier than a workspace-only tool by design. |
| Review flow | Review loop is planned, not shipped. Today you review in the terminal and with git, as usual. | Diffs view with review, commit and pull-request management without leaving Cursor. Design Mode overlay for visual context. |
| Remote | Add a server over SSH, or share a machine with a ten-symbol code. Relay at relay.getleon.dev is online. End-to-end encrypted. | Cloud agents that run while the laptop is closed, plus phone, web, Slack, GitHub and Linear surfaces. Move agents between cloud and local. |
| Speed and footprint | 1-2 ms history search over about 14,700 messages; about 5 ms re-import with nothing new; about 6 s test suite. Measured on one M1 Pro. Your machine will differ. The download is 23 to 27 MB as of 0.9.0. | Not listed as a footprint number (as of Oct 2026). It is a full IDE with indexing, so expect IDE-scale install and memory. |
| Platforms | macOS, Linux and Windows. | macOS, Windows and Linux editor, plus web and iOS surfaces for agents. |
| Licence and price | Apache-2.0, open source. Free. Bring your own agent subscriptions. | Hobby free with limited requests. Pro around $20/mo with a credit pool, Pro+ and Ultra above. Parallel and cloud agents draw from that pool plus VM time (as of Oct 2026). Leon is free plus your agent spend. |
Beyond the table.
Where Leon is stronger
- Agent-neutral: Claude Code, Codex, OpenCode and 40 others side by side, not one vendor.
- Small and fast: a 23 to 27 MB download, millisecond history search, no indexing step.
- Works beside whatever editor you already use.
Where Cursor is stronger
- Agents inside the editor with diffs, PRs and /best-of-n model comparison.
- Cloud VMs with environments, secrets and snapshots for long tasks.
- Phone, web, Slack, GitHub and Linear surfaces for the same agents.
Honest limits of Leon here
- Not an IDE. The built-in file editor has syntax highlighting, search and Markdown preview, but no code completion, no language server and no inline AI edits. No /best-of-n.
- No cloud VMs. Long tasks run on machines you own.
- No Design Mode or visual agent verification built in.
Choose honestly.
[ CHOOSE LEON ]
- You already have an editor and want agents supervised in one neutral place.
- You compare Claude against Codex against OpenCode on the same task.
- You want a small install with no credit pool to manage.
[ CHOOSE CURSOR ]
- You want agents where you edit, with diffs and PRs in the same window.
- You hand long tasks to cloud VMs and check them from your phone.
- You compare models with /best-of-n instead of by hand.
Switching takes minutes.
Both tools run the same repos and the same agent CLIs.
- Keep Cursor for editing. Add Leon for supervision across repos and machines.
- Same worktrees and branches. Leon reads the repos you already open in Cursor.
- Agent history for Claude Code, Codex and opencode becomes searchable in Leon.
Questions.
Does Leon replace Cursor?
No. Cursor is an editor with agents. Leon is a workspace for agents. Its built-in file editor is for reading and quick edits, with no code completion. Many developers edit in Cursor and supervise fleets in Leon.
What about /best-of-n?
Cursor fans one prompt across models in isolated worktrees. In Leon you do the same by hand: one session per agent, compare, merge the winner.
Which costs more?
Cursor Pro is around $20/mo with a credit pool, plus cloud VM time. Leon is free. Either way you still pay the underlying model spend (as of Oct 2026).
Leon facts: the app README, CHANGELOG and brand book, via COPY.md. Leon is independent and unaffiliated with Cursor. Third-party names and marks identify compatibility and remain their owners' trademarks.
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