BrainGrid

BrainGrid is an AI app builder that writes a specification with acceptance criteria first, gets user approval, then builds, verifies each criterion with attached evidence, and runs the app live with hosting, sign-in, and email handled. Developers can also pull the spec into Claude Code, Cursor, or Codex over MCP or CLI.

BrainGrid is an AI app builder built around a single premise: the plan should exist before the code does. Most AI coding tools accept a prompt and start generating files immediately, which tends to produce a prototype that breaks at the third feature. BrainGrid inserts a planning stage in front of the build, so the output is a running product with documented requirements rather than a pile of code that needs rescue. The workflow has four stages. A Planning Agent asks clarifying questions and drafts a specification that includes acceptance criteria (the checks that prove a feature works), a data model, and a readiness score. Nothing is built until that plan is approved. A Builder Agent then works against the spec, with Claude Code running in a cloud sandbox that shows a live preview and produces finished changes that can be shipped. Verification is the distinctive step: every acceptance criterion is checked and evidence is attached, such as test runs, screenshots, or a recorded flow, so completion is demonstrated rather than asserted. Finally the product goes live on BrainGrid Cloud with hosting, sign-in, data, and email handled, on its own URL. Developers who prefer their own environment are not locked out. The spec can travel over MCP or CLI into Claude Code, Cursor, or Codex, so planning and verification happen in BrainGrid while the build runs in the user's repository. The company pitches this as zero lock-in. The intended audience is broad: non-technical domain experts turning industry knowledge into a paid SaaS product, teams replacing a spreadsheet or rented internal tool, and developers who want a feature added to an existing codebase. BrainGrid explicitly positions itself against vibe coding and against AI builders that skip requirements, appealing to people whose prototype has become difficult to maintain. Plans start at $29 per month with cancellation at any time. Where it fits: it overlaps with AI app builders on the output side and with spec and requirements tooling on the front end, but the combination of an approval gate, evidence-backed verification, and optional handoff to third-party coding agents is unusual. Teams that want maximum speed and no process will find the planning stage adds friction. Those who have been burned by confident agents delivering broken software will see that friction as the point.