Temporal.PW is described as 'Temporary secure storage for transmitting passwords over insecure channels' and is an website in the security & privacy category. There are six alternatives to Temporal.PW, not only websites but also apps for a variety of platforms, including Self-Hosted solutions, SaaS, Heroku and Docker. The best alternative is Yopass, which is both free and Open Source. Other great sites and apps similar to Temporal.PW are One-Time Secret, Password Pusher, Burn After Reading and Password.link.
Yopass is a project for sharing secrets in a quick and secure manner*. The sole purpose of Yopass is to minimize the amount of passwords floating around in ticket management systems, Slack messages and emails.
Securely send and receive sensitive information using one-time links. Secrets are always encrypted and decrypted client-side and cannot be seen by the service. Also has features like notifications, webhooks, branding, API.