BrainGrid

BrainGrid is an AI app builder that writes a spec, gets approval, then builds, verifies, and runs apps live.

Plan-first AI app builder

BrainGrid is an AI app builder that plans before it builds. Instead of jumping straight to code, it starts by writing a spec, asking clarifying questions, and getting your sign-off before implementation begins.

The product then builds the app, verifies every acceptance criterion with attached evidence, and can run the result live with hosting, sign-in, data, and email handled. BrainGrid supports both a cloud workflow and a handoff to your own tools through MCP or CLI, so it can fit solo builders, teams, and developers working in their own repo.

Core capabilities

Spec-first planning

BrainGrid starts by asking clarifying questions, then writes a spec that includes acceptance criteria, a data model, and a readiness score before any build work begins.

Cloud-based build workflow

After sign-off, the Builder Agent uses Claude Code in a cloud sandbox to implement the spec, with a live preview available during the process.

Verification with evidence

The platform checks each acceptance criterion and attaches proof such as test runs, screenshots, or flow recordings so the result can be inspected.

Bring-your-own-agent support

For developers who want to keep their existing setup, the spec can move into Claude Code, Cursor, or Codex over MCP or CLI and continue in their own repo.

Live product hosting

BrainGrid can run the product live with hosting, sign-in, data, and email handled, and it assigns the app its own URL on BrainGrid Cloud.

Broad app-building targets

The homepage shows multiple project types, including SaaS products, internal tools, repo features, AI-powered apps, marketing sites, and rescued prototypes.

Where it fits

Build a new SaaS product
Map out a SaaS idea, approve the spec, and let BrainGrid take it from planning through verified delivery and live hosting.
Create an internal tool
Replace a spreadsheet or a rented tool with a scoped internal app that lives on BrainGrid Cloud for your team.
Ship work in an existing repo
Plan a feature in BrainGrid, then continue implementation in your own repository with Claude Code, Cursor, or Codex over MCP or CLI.
Rescue a fragile prototype
Bring a prototype or “vibe-coded” app back through the planning loop so missing requirements can be verified before more changes are made.
Publish a marketing site
Use BrainGrid to launch a marketing site that is on-brand, lives on your domain, and is hosted as a working product rather than a static mockup.

Pros and Cons

Pros

Starts with a spec and clarifying questions instead of immediate code generation.
Includes acceptance criteria and evidence so the result is checked, not just described.
Can run live with hosting, sign-in, data, and email handled.
Supports both BrainGrid Cloud and bring-your-own-agent workflows over MCP or CLI.
Offers plan tiers for solo builders, larger projects, and teams.

Cons

The public sources do not provide full documentation for integrations, runtime limits, or platform specifics beyond the high-level workflow.
Pricing is paid-only; the pricing page says there is no free trial.
The homepage and pricing page leave some plan details and limits unclear beyond the stated seat, credit, and project tiers.

FAQ

What does BrainGrid do?

BrainGrid is an AI app builder that starts with a written spec. It asks clarifying questions, defines acceptance criteria and a data model, then builds the app and checks each criterion with attached evidence before it runs live.

Who is BrainGrid for?

The homepage says BrainGrid is for people building SaaS products, internal tools, repo features, AI-powered apps, marketing sites, and rescued prototypes. The pricing page also positions it for solo builders, builders working faster, and teams collaborating on plans and specs.

Is there a free trial?

No. The pricing page says there is no free trial and that you choose a paid plan before anything is provisioned.

Can I change or cancel my plan anytime?

Yes. The pricing page says you can change or cancel your plan anytime.

Can I use BrainGrid with my own coding tools?

BrainGrid can be used in its own cloud workflow or with your own agent and repo. The homepage says the spec can travel over MCP or CLI to Claude Code, Cursor, or Codex, and the pricing page says plans support bringing your own agent.