An invited pilot for individual builders.
We're starting with a small group of individual builders. Bring a project, connect your design requirements to code checks, and help us improve the experience. The first 100 invited recipients receive $5 of managed AI credit; paid subscriptions are not available yet.
Where things stand
Updated September 24, 2026: FlowRail is currently available through an invited pilot for individual builders. Contact hello@flowrail.ai to ask about access.
The first 100 distinct pilot invitation recipients receive $5 of managed AI credit. An invitation reserves a place; accepting it with a verified email and signing in activates the credit for 30 days. Joining the waitlist or asking about access does not reserve a credit place. The pricing page explains the pilot charge ceilings and the future paid offering.
What FlowRail does
FlowRail connects your design requirements to the code your coding agent proposes. It reviews your specification, turns supported security requirements into scoped rules, and checks supported file writes before the code reaches disk.
When proposed code violates an applicable rule, FlowRail can deny the write. The agent receives the finding, corrects the code and retries. The dashboard keeps the requirement, findings and subsequent evidence together.
Who it's for
Individual builders using coding agents to make real things. If you're shipping a side project or an early product and you couldn't say offhand what a CSV formula injection or an SSRF sink looks like, that's exactly the gap this covers. You shouldn't have to become a security engineer to let an agent write your code.
What you can try in the pilot
Follow a requirement from design review to a proposed code change, a finding and a correction. The How it works page follows a recorded invoice-access example.
Dependency checks cover supported npm and pip paths and supported lockfile changes. Local secret detection checks for hardcoded credentials. The documentation describes the scope of each check.
Review evidence makes unresolved requirements visible. A passing write does not automatically close the review or establish that the whole application is secure.
How to install
Once you have pilot access, follow the installation guide at /docs/install. It walks through account setup, API-key handling, installation and verifying the connection and hooks. Claude Code is the supported hook integration today.
What to know before you start
FlowRail checks supported operations and the context available to each check. An incomplete design-bound check pauses the write for a retry under the default settings. Writes without a bound design review can still proceed when an operational failure prevents a check.
Your specification and candidate code are sent to FlowRail and its configured model provider for analysis. Read the privacy page before supplying sensitive code.
Help shape the experience
The pilot is a chance to try FlowRail on a real project and tell us what it caught, what it missed and where it got in your way. We're starting with a small group so that feedback can directly improve the product.