I've been posting updates here, where you can see a demo: https://bookletupdates.substack.com

I'm working on "public" groups, so that I can link directly to a meta group about the project from the homepage. It should be live early next week!

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I'm using phone number as primary login for these reasons:

1. I want passwordless login

2. Passwordless login with email is confusing because most people have multiple emails. But, most people have only one phone number.

3. I want to support per-group email preferences easily (i.e., multi-email)

4. iOS auto-fill makes it trivial to sign in

5. Phone number verification hopefully provides enough spam control that I can avoid deploying tools like Recaptcha - which I think are more invasive to privacy. (I'm aiming to be 100% Google-free and Facebook-free)