Fletch is a native macOS IDE designed for agentic engineering, providing an orchestration layer to run multiple AI coding agents like Claude Code, Cursor, and Codex in parallel.
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It emphasizes security and reliability by isolating each agent in its own sandbox and chaining them into deterministic, gate-based workflows that require human approval before merging code.
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Deterministic multi-agent workflows with plan, build, review, and test stages
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OS-level sandboxing (macOS Seatbelt or Docker) for full workspace isolation
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Codebase indexing via MCP to provide agents with symbol and call-graph awareness
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Centralized control room for managing multiple agent CLIs and live diffs
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Approval-based merge gates that prevent unverified code from reaching the main branch
Free
Fletch is free and open-source under the AGPL-3.0 license. It does not charge subscription fees or mark up API usage, as it acts as an orchestration layer for the agent CLIs and LLM subscriptions the user already pays for.
Best for
Engineers building complex software who require high auditability, parallel agent execution, and disciplined, repeatable workflows that prioritize code quality over raw generation.
Not ideal for
Developers seeking a lightweight, ephemeral chat-only AI tool, or those who require cross-platform support outside of macOS, as Fletch's current orchestration and sandboxing architecture is macOS-specific.
Fletch is a powerful, local-first workbench that shifts the focus from merely generating AI code to engineering trustworthy software through rigorous isolation and verified workflows.
Version 0.8.18 (October 2026) introduced codegraph support for boxed agents, support for running various agents (Codex, Cursor, OpenCode, Pi) inside isolated boxes, and improved UI stability for workspace terminals.
As of
Is Fletch free?+
Yes - Fletch is Free. Fletch is free and open-source under the AGPL-3.0 license. It does not charge subscription fees or mark up API usage, as it acts as an orchestration layer for the agent CLIs and LLM subscriptions the user already pays for.
Is Fletch open source?+
Fletch is not listed as open source on ai.dosa.dev - it is Free.
Who is Fletch best for?+
Engineers building complex software who require high auditability, parallel agent execution, and disciplined, repeatable workflows that prioritize code quality over raw generation.
Who is Fletch not ideal for?+
Developers seeking a lightweight, ephemeral chat-only AI tool, or those who require cross-platform support outside of macOS, as Fletch's current orchestration and sandboxing architecture is macOS-specific.
What are the best Fletch alternatives?+
The closest Fletch alternatives on ai.dosa.dev are Cursor, Devin, Trae - all listed under AI-Native IDEs & Editors.
Who makes Fletch?+
Fletch is developed by FWDAI. It is listed in the AI-Native IDEs & Editors category on ai.dosa.dev.
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