BrainGrid is the AI Product Planner that also builds. It interrogates your idea with clarifying questions, writes an engineering-grade requirement with acceptance criteria, scores its readiness, breaks it into tasks, and then either loads them into your coding agent over MCP or builds the requirement itself in an isolated sandbox and opens a pull request.

What is the core difference between BrainGrid and Spec Kit?

Who does the work. Spec Kit gives your agent a process to follow: you drive the slash commands, review the markdown it scaffolds, and manage the files in your repo. BrainGrid does the planning work itself: it asks the questions, writes the spec, scores it against readiness criteria, and persists everything outside any single session, then optionally builds and verifies too.

Yes, Spec Kit is free and open source. You bring your own coding agent and its costs. BrainGrid is a paid product, plans from $29/mo per seat, with no free trial. The honest trade: Spec Kit costs time and engineering judgment, BrainGrid costs money and saves both.

Can I use BrainGrid and Spec Kit together?

There is no integration, and you mostly would not want both running the same project: two sources of truth for specs creates drift. Some teams use Spec Kit conventions in the repo and BrainGrid for product-level planning. If you are starting fresh, pick one spec source of truth.

Who should pick Spec Kit?

Engineers who live in the terminal, want full control of every artifact, prefer open source, and are happy maintaining spec templates and reviewing every markdown file the agent drafts. If that is you, Spec Kit is genuinely good.

Who should pick BrainGrid?

Builders who want the spec written for them, not scaffolded for them to finish. Founders, product people, and engineers who want clarifying questions, readiness scoring, persistent requirements across sessions, an MCP handoff to any agent, and the option to let BrainGrid build and verify the work itself.

What is the best GitHub Spec Kit alternative?

It depends on what you found limiting about Spec Kit. If you want the same open-source, in-repo approach, OpenSpec and similar toolkits are close cousins. If what you actually want is the spec written and scored for you rather than scaffolded, BrainGrid is the alternative: it asks the clarifying questions, writes the requirement with acceptance criteria, persists it across sessions, and can build and verify the work, all without leaving the coding agent you already use.

Honest comparison

BrainGrid vs Spec Kit

Both bring spec-driven development to AI coding, and both are good. The difference is who does the work: Spec Kit scaffolds a process for you to run, BrainGrid runs it for you.

Templates you fill in, or a spec written for you.

The short answer

Same belief, different layer

Spec Kit is an open-source process kit: slash commands and markdown templates that guide your agent through writing specs in your repo. BrainGrid is an AI Product Planner that writes the spec itself, scores it, persists it, and can build and verify the work. If you want control of every artifact, pick Spec Kit. If you want the outcome without the overhead, pick BrainGrid.
Both are implementations of spec-driven development. We think the method matters more than the tool, including ours.

Side by side

Stage by stage

GitHub Spec KitBrainGrid

Writing the spec

Spec Kit: Your agent drafts markdown from templates via /specify. You review and finish it.

BrainGrid: BrainGrid interrogates the idea with clarifying questions, then writes the full requirement for you.

Quality check

Spec Kit: You judge whether the spec is complete.

BrainGrid: Readiness scoring against explicit criteria: structure, coherence, acceptance criteria coverage, UX flows, technical completeness.

Task breakdown

Spec Kit: /tasks generates a task list as markdown in the repo.

BrainGrid: Sequenced, agent-sized tasks with context, steps, and success criteria, tracked with status.

Where it lives

Spec Kit: Markdown files in your repository, per project.

BrainGrid: Persistent workspace outside any session, shared with your team, synced to your repo and branches.

Building

Spec Kit: Your agent, driven by you, in your environment.

BrainGrid: Load any agent over MCP or the CLI, or let the Builder Agent build in an isolated sandbox and open a PR.

Verification

Spec Kit: You review against the spec by hand.

BrainGrid: AI code review checks the pull request against your acceptance criteria, item by item.

Cost

Spec Kit: Free and open source. You bring agent costs and your own time.

BrainGrid: Paid product, plans from $29/mo per seat. No free trial.

The honest pick

Pick by who you are

Pick Spec Kit if

You live in the terminal and want open source
You want to own and edit every artifact
You are happy maintaining templates per repo
Reviewing agent-drafted markdown is a feature, not a chore

Pick BrainGrid if

You want the spec written for you, with the questions asked first
You want readiness scoring before anything gets built
You want specs that persist across sessions, agents, and teammates
You want the option to have BrainGrid build and verify it too

Either way you end up spec-driven, which is the part that matters. See how BrainGrid runs the whole cycle in The BrainGrid Loop.

You ask, we answer

BrainGrid vs Spec Kit, answered

What builders ask when they compare the two.

Spec Kit is GitHub's open-source toolkit for spec-driven development. It scaffolds a spec workflow into your repository: slash commands like /specify, /plan, and /tasks that guide your coding agent through writing a constitution, a specification, a plan, and tasks as markdown files. It is free, open source, and works with Claude Code, Copilot, and other agents.

Try the other take

Specs written for you, not by you

Describe the idea, answer a few questions, approve the spec, and build. Plans from $29/mo. Cancel anytime.