PromptOS
PromptOS offers a free tier for getting started and paid Solo, Team, and Business plans for organizations that govern AI work. Every plan includes the prompt builder, saved prompts with version history, and model comparison.
Paid plans add team workspaces, shared standards, approval flows, evals, run history, and higher usage quotas. Subscriptions are billed monthly or yearly through Paddle, and you can cancel or request a refund under the refund policy.