About / Operator

Solo Built Tools is a comparison site for the tools that solo businesses and creators actually run on: email marketing, CRM, and work management.

Who operates this site

Solo Built Tools is operated personally by Fujino Kodai, based in Japan. It is an individually operated website — it is not operated by a corporation, and nothing on this site should be read as a company publication. The operator is the publisher and is responsible for the content.

Who it is for

Owners and tiny teams — roughly 1 to 10 people — choosing tools for email, customer management, and day-to-day work. The recurring problems we write about are predictable ones: "the features are more than I need", "I can't tell what it will cost as I grow", and "I won't use half of it".

How we compare

Every comparison follows the same format: the conclusion first, who each tool is and is not for, a pricing table on the same basis (same currency, billing period, and list size, with the counting method stated), a comparison by use case, and the caveats. Prices and features are taken from the vendors' official pages and carry a check date. Our full method is on the Editorial & Review Policy page.

How the site earns

Some links on this site are affiliate links; if you sign up through one, we may earn a commission at no extra cost to you. Commissions do not change our conclusions. Details: Affiliate Disclosure.

Contact

Corrections and questions are welcome — see the Contact page.

Last updated: 2026-11-14.