Kutt vs Rebrandly

Kutt is a free, open-source, self-hostable URL shortener supporting custom domains, link expiration, password protection, and per-link statistics. The public instance and REST API live at kutt.to (authenticated with an X-API-Key header), and the AGPL-licensed codebase can be self-hosted for full control. Note that the old kutt.it domain is no longer operated by the project — its maintainers warn it may now be a phishing site — so integrations should target kutt.to.

Rebrandly specializes in branded short links on your own custom domain, aimed at marketing and brand-consistent link sharing. Its REST API uses an apikey header and covers link creation, custom slashtags, tags, domains, and click analytics, returning JSON. A free tier allows a capped number of branded links per month, with paid Starter, Pro, and Enterprise plans scaling link volume, domains, and team features.