Factorial vs Openbook

Factorial has no write-up on Specifiction yet; its figures are above.

Openbook is a team workspace organized into organizations, spaces, and rooms, with 21 room types for planning, writing, discussion, and tracking. Its build agent can connect to GitHub and GitLab repositories, make changes, run builds, and open pull requests. Organizations can use platform-run AI models or configure provider keys for OpenAI, Anthropic, DeepSeek, xAI, Google, and Azure OpenAI. Built-in connectors include WordPress, Slack, Figma, Shopify, Stripe, Google Calendar, Cal.com, Calendly, five helpdesks, HubSpot, and Salesforce. Connector writes are disabled by default and require explicit enablement; irreversible third-party actions run only in auto mode. Files can be stored on Openbook, S3-compatible storage, Dropbox, or Microsoft SharePoint/Teams; default server storage is limited to 30MB. A read-only Board API exposes Kanban boards as JSON and supports change webhooks. Free costs nothing and allows up to 10 editing members and 3 spaces; viewers and guests are free. New organizations start with a 14-day Pro trial without a card. Business costs $15 a month. The intended audience includes product managers, founders, small teams, and agencies.