Hybrid publisher Spines raises $64 million to automate book production

Securing the capital for growth

Spines, a startup with offices in Israel and New York, announced it raised $64 million in new funding to accelerate its publishing platform. The funding package consists of a $29 million Series A-1 equity round led by Zeev Ventures and a $35 million growth financing facility from Twelve. The company did not disclose its specific valuation following the investment.

The capital injection comes as the company reports significant financial momentum. Spines recently hit a $50 million annual revenue run rate, which represents a 400% increase compared to the previous year. This growth is attributed to the company's new suite of AI-powered services designed to assist writers.

The company plans to use this new capital to expand its product offerings and enter new markets. While the company currently focuses on the U.S., it intends to move into other English-speaking regions like the U.K., Canada, and Australia. Management aims for annual growth targets between 200% and 300%.

The hybrid publishing model

Spines operates as a hybrid publisher, a middle ground between traditional publishing houses and independent self-publishing. In this model, authors pay an upfront fee to have their work published but retain more control and a larger share of the royalties than they would with a major commercial house. Spines provides a higher level of service than self-publishing platforms by offering dedicated support and production tools.

The company describes its platform as an operating system for authors who may not have secured a traditional deal. Writers upload a finished manuscript, and the platform takes over the technical and logistical requirements of the industry. This includes formatting for ebook and print-on-demand, managing metadata, and distributing the work to over 100 channels, including Amazon and Barnes & Noble.

Authors can also use the platform to create audiobooks using synthetic narrators or voice clones of themselves. Spines currently supports seven target languages and plans to expand to 20 within the next six months. The company recently adjusted its royalty split, allowing authors to keep 80% of net royalties, an increase from the previous 70% share.

How AI agents handle production

The core of Spines' technology involves specialized AI agents that perform tasks traditionally handled by human freelancers. These agents can edit manuscripts, proofread text, and manage social media campaigns. Founder Yehuda Niv noted that many authors struggle because human cover designers often lack the time to read the full book before creating art.

The Spines cover agent works differently by reading the manuscript and researching retail categories to determine which designs perform best. It then generates covers that match those specific metrics. This process significantly reduces the time it takes to move from a finished manuscript to a retail store, a journey that often takes a year in traditional publishing but only weeks with Spines.

Despite the heavy use of automation, the company maintains a strict policy of only publishing books that are 100% written by humans. They use software to filter out manuscripts generated by AI. Niv stated, "We are not here to replace [authors] with AI," emphasizing that the goal is to empower human writers rather than replace them.

Human oversight and next steps

While AI handles much of the production, Spines employs roughly 350 people to manage customer success and support. About 50 of these employees work in research and development, while the rest help authors make subjective decisions that software cannot handle. For example, while an AI might design three different covers, a human expert helps the author choose the one that feels right emotionally.

The company is also navigating the legal complexities of AI-generated content. Because U.S. courts have ruled that images made entirely by AI cannot be copyrighted, Spines licenses its image-generation tools and passes those licenses to the authors. Niv argues this provides a broader license than what many authors receive from human illustrators, who often retain the copyright themselves.

Looking forward, Spines is in early discussions with one of the 'Big Five' U.S. publishers regarding a potential partnership. This deal could see Spines' AI agents being used to run the services of a major traditional publishing house. The company aims to become a leader in the next generation of the publishing industry by combining high-tech automation with human-centric support.