GitHub's Spec Kit is a free, open-source toolkit for spec-driven development: you run specify init, then drive a feature from constitution to spec to plan to tasks to implementation with slash commands, in any of 30+ AI coding agents. It is good at what it does, and it is not what Brainfile does. Spec Kit's unit of work is a FEATURE. Brainfile's unit of work is the OPERATOR — the standing context, run protocol and memory your AI carries into every session, on every project, including the sessions that are not building a feature at all.
Spec Kit: a free, open-source toolkit from GitHub for Spec-Driven Development. You run `specify init`, and your coding agent gains a set of `/speckit.*` slash commands that walk a change through constitution, specification, planning, tasks and implementation. It works with 30+ AI coding agents and is extensible with presets and extensions.
Brainfile: a maintained operating layer for Claude Code — CLAUDE.md plus a brain/ directory, an Autopilot run protocol, a never-empty backlog, a directive ledger that tracks every ask until it is proven done, memory, and an end-of-run brief. It is read automatically, every session, whether or not you are building a feature.
These answer different questions. Spec Kit answers 'how does THIS change get built correctly?' Brainfile answers 'how should my AI behave, remember and report, across everything I do?' Neither replaces the other, and running both is the common case.
| Feature | Spec Kit | Brainfile |
|---|---|---|
| Unit of work | One feature or change, spec → plan → tasks → implement | The operator: standing context, protocol and memory across all work |
| When it applies | When you are building something specifiable | Every session, including research, ops, review and admin work |
| Loads automatically | Invoked — you call the slash commands | Automatic — CLAUDE.md is read at session start with no ritual |
| Memory between sessions | Per-change artifacts in the repo (spec, plan, tasks) | Directive ledger, conversation history and memory that persist |
| Tracks an ask until it is done | Tasks exist for the change in flight | Directive ledger tracks every ask until it is PROVEN done |
| Agent coverage | 30+ AI coding agents, CLI and IDE | Claude Code first; the context files are plain markdown any tool can read |
| Team standards | Constitution governs the project's change process | Role packs and rules govern how the operator behaves |
| Reporting | Artifacts you read yourself | End-of-run brief: accomplished / needs-you / next priorities |
| Extensibility | Presets and extensions, community-driven | 10 pattern files, 15 role packs, weekly freshness feed |
| Price | Free — open source, no paid tier to unlock the workflow | Paid subscription — Brainfile Pro, with a 30-day free trial and no card |
You want a disciplined, repeatable way to take a feature from idea to implementation, you work across several different AI coding agents, and you want that process to live in the repo where your team can review it. It is free, open source, and mature — there is no reason not to use it for that job.
Your problem is not 'how do I build this feature' but 'my AI forgets who I am, what we ruled out, and what I asked for last week.' You want context, a run protocol, a backlog and a directive ledger that load automatically every session — including the sessions that are not feature work.
This is the normal answer. Spec Kit governs the change in flight; Brainfile governs the operator running it. A CLAUDE.md that states your conventions, constraints and prior decisions makes every /speckit.specify better, because the agent is not starting from a blank slate. They sit in the same repo without conflicting.
Spec Kit is a workflow: a sequence of commands that turns an intent into a spec, a plan, a task list and code, with a constitution setting the rules of the road. Its artifacts are scoped to the change being made, which is exactly right for governing a build.
Brainfile is a standing layer, not a sequence. It is what your AI reads before you have said anything — your role, your conventions, what has already been decided and ruled out, the protocol it runs work under, and the ledger of everything you have asked for. It applies whether the next thing you type is a feature request or a question.
Brainfile Pro is the maintained context layer, run protocol and directive ledger your AI reads every session. 30-day free trial, no card.
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