AI publishing platform Spines secures $64 million and reports a $50 million revenue run rate

Spines, a publishing platform that sells book production services to authors, announced $64 million in growth capital on November 9. The money is split into two parts: a $29 million Series A-1 equity round led by Zeev Ventures, and a $35 million non dilutive growth financing facility from Twelve. Aleph, NordStar, M-Fund, LionTree and angel investor Dan Senor also took part.

The company reports a $50 million revenue run rate and 400 percent year over year growth. A revenue run rate extrapolates recent revenue rather than reporting sales already earned over a full year. These are company figures, not independently verified results.

Spines says authors bring their own manuscripts. Its AI agents handle publishing tasks including editing, proofreading, cover design, formatting, translation, audiobooks and royalty management. Authors can also work with its human publishing professionals. The company says it distributes through more than 100 channels and positions the service as support for authors, rather than a replacement for their writing.

According to the release, more than 8000 American authors have published with Spines, and around 400 new authors join every month.

For makers, the interesting product choice is software around an author's existing work, with human help still available. The financing structure also matters: the headline $64 million combines equity with a facility, not a single equity round. The announcement does not say how much of that facility has already been drawn.