What are some alternatives?
When comparing Mailbrew Inbox and Unreadit, you can also consider the following products
News.calm.sh - Turn your favorite websites into a daily digest.
Upvoted - A news publication by reddit
Mailbrew - Automated email digests from Twitter, Reddit, YouTube & more
Tiny Text - A weekly article sent via sms, on topics of your choice
HelloDigest - Receive all of your digests & newsletters in a single email
Blogtrottr - Track RSS feeds and send updates to your email inbox.