You can try Letter without signing up! The demo version is available with a walkthrough guide that shows you how to use the content import feature. By making a demo version available without having to sign up, I hope to save time for everyone. I only want people to create an account if they find the app useful.
It would be easy to gather signups by forcing people to register before trying Letter, but in the long run, it creates another vanity metric. It can result in 100s of users who don’t actually use the app – they only signed up to test it out.