Synthetic

Synthetic, based in San Francisco, is an autonomous AI bookkeeping service for software startups that aims to produce clean, accrual basis books with no human bookkeepers or accountants in the loop. Founded in 2025 by chief executive Ian Crosby, who co-founded Bench Accounting and built it into one of the largest small business bookkeeping services in North America before later founding Teal, it raised a ten million dollar seed round in May 2026 led by Khosla Ventures, with Basis Set Ventures and operator investors including Shopify's Tobi Lütke. Its thesis is that the human staffed bookkeeping model has a structural ceiling on price, speed, and availability, and that only full automation can break it.

Synthetic connects directly to a customer's banks, payroll systems, billing platforms, and inboxes, then reconciles everything into accrual basis books ready to hand to a tax preparer, coming back with sharp clarifying questions when it needs context about the business. It is built compliance first, with tax rules and audit trails intended to keep startups audit ready, and it combines accounting tuned language models with proprietary optical character recognition and transaction matching. The product is deliberately narrow, serving only software, SaaS, and AI startups whose financials are relatively simple, a scope Crosby compares to a self driving car that has only learned a few streets, chosen to push accuracy higher before broadening. Notably, the company takes full responsibility for accuracy rather than positioning itself as an assistant, and it says it will not release broadly until the system is more reliable than a human bookkeeper. The longer ambition is a Stripe for bookkeeping, an embeddable service and eventually fully automated company formation across incorporation, banking, and payments.

Synthetic is early and focused rather than a broad platform, which its scoring reflects: it is strong on the core loop of connecting to financial systems, reconciling, and producing auditable accrual books, but it does not yet offer deployment options, customer model choice, a prebuilt agent library, or public developer extensibility. It runs as a cloud service and does not drive a browser. For an early stage software startup that wants clean, low cost, accrual basis books without hiring a bookkeeper or operating accounting software, Synthetic is a well aligned and affordable bet, with the caveat that it is a young product staking everything on full autonomy; a larger company with complex financials, or a team wanting a configurable finance automation platform today, should look to more established options.