How Sandstone grew 40x in 147 days on Vercel
By Steven Van ·
The legal-intake startup raised a $30M Series A after scaling on Vercel's preview deployments, AI SDK, and Secure Compute.
Vercel customer Sandstone, a legal intake and workflow platform, grew revenue 40x in under six months after launch and raised a $30M Series A led by Lightspeed. The company points to three parts of the platform behind that growth: preview deployments, the AI SDK, and Secure Compute.
- Preview branches with inline commenting through Vercel Toolbar let Sandstone's head of marketing leave a note on a live landing page that automatically creates a Linear issue for engineering, turning what used to take an afternoon into a single comment. Co-founder and CTO Liam Germain said a Sunday request for a scrollbar accessibility change was live in production five minutes later.
- Vercel Flags runs feature flags across Sandstone's seven-app turborepo monorepo, deployed to multiple Vercel projects, giving the team control over what is live, demoed, or still in progress without touching a deployment.
- The AI SDK powers Sandstone's multi-step agentic legal workflows, which search thousands of procurement agreements, surface at-risk ones, and alert owners over Slack. Within that same SDK, Chat SDK runs its Teams integration, Emulate SDK handles integration testing for Slack and Okta, Agent Browser SDK runs agentic testing locally, and Flags SDK drives the toolbar integration.
- Vercel Secure Compute keeps communication between Vercel and Sandstone's data layer private, so it never touches the public internet.
Sandstone now manages more than 1,000 legal requests a day across customer teams and plans to use the new funding to expand into more legal departments.
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