How Grw AI closed a $4.4M seed round with Lumin Sign

Alex McNaughten is co-founder and co-CEO of Grw AI, a San Francisco-based startup that builds AI sales teammates for high-performing B2B sales teams. When Alex isn’t busy scaling the business, he’s managing the high-stakes documentation that makes or breaks a funding round.

The ability to have documents signed quickly and reliably isn’t a nice-to-have at a growth-stage startup; It’s the difference between closing an angel investor and losing momentum.

The solution: clean, fast, and priced for founders

Before Lumin Sign, Grw AI used DocuSign for investor documentation. It worked, but Alex found it bloated and expensive for what it actually delivered.

“DocuSign is pretty expensive for what it is, candidly. When I tried Lumin Sign, I was like, oh, this does all the same stuff, and it’s really clean and easy to use. It was kind of just like tick, tick, tick.”

The switch came through an unlikely channel: Lumin had been a Grw AI customer for a long time. During a routine check-in, a member of the Lumin team asked Alex if he was using Lumin Sign. He wasn’t. He signed up the next day and hasn't looked back since.

For Alex, the buying criteria were simple: ease and speed. As a busy founder, he doesn’t want to spend time wrestling with document setup. Lumin Sign allows him to get agreements out the door in seconds: SAFE agreements, NDAs, partner contracts, referral agreements, all without the administrative friction slowing him down.

“User experience is probably my biggest buying criterion. If it’s easy and does what I need it to, which is make sure things are signed appropriately, then that’s the win.”

Why Alex recommends Lumin Sign

The strongest measure of Lumin Sign’s value for Grw AI came during their most recent funding round. Alex used it to secure the first crucial angel investor checks and SAFE agreements, the documents that helped unlock the rest of the round.

Grw AI raised $4.4 million USD in their seed round. Lumin Sign was there for every signature that made it happen.

“Lumin was instrumental in getting those first angel checks signed that then helped to unlock the rest of that. It’s very, very, very important.”

Beyond fundraising, Lumin Sign handles the ongoing documentation required for scaling a team: NDAs, partner contracts, and referral agreements. And because it sits alongside Lumin's PDF tools in one ecosystem, Grw AI gets more for less… a leaner tech stack at a price point that makes sense for a startup.

A good product that does what you need it to do. Excellent value and competitively priced, which for a fast-moving founder, is exactly the point.