Open source alternatives to Gmail

3 projects on starwire do the same job. Ranked by how much of what Gmail does each one covers, read from its README and website. Ties go to the most active.

What Gmail does

  1. Emailcore
  2. Spam filteringcore
  3. Search
  4. Labels and filters
  5. Mobile apps
  6. Calendar and contacts integration
  7. Large storage

Each dot in the table is one job, in this order. Square dots are core jobs and count double. Full means yes, half means partly. "See the evidence" under a project shows the line behind each one. Coverage is what a project documents, not how well it works or how hard it is to move to. How we score this

ProjectCoversStarsCommits, 12 weeksLast releaseClosed vs openedSetupLicense
mailinaboxScripted one-click install of a full mail server with SMTP and webmail Replaces it78%15k+12
10
 49 days ago63% Needs a server CC0-1.0
Covers all 2 core jobs. Not shown: Search; Large storage.See the evidence
  • EmailcoreYesinto a working mail server
  • Spam filteringcoreYesSpam filtering (spamassassin) and greylisting (postgrey)
  • SearchNot shownNeither the README nor the website mentions it.
  • Labels and filtersYesmail filter rules (thanks to Roundcube and Dovecot)
  • Mobile appsYesfor use with mobile devices and desktop mail software
  • Calendar and contacts integrationYesCardDAV/CalDAV (Nextcloud)
  • Large storageNot shownNeither the README nor the website mentions it.
tutanotaEnd-to-end encrypted email, contacts and calendar across all devices Replaces it49%8.2k+23
639
 4 days ago100% Install like an app GPL-3.0
Covers 1 of 2 core jobs. Partly: Large storage. Not shown: Spam filtering; Search; Labels and filters.See the evidence
  • EmailcoreYessecure email service with built-in end-to-end encryption
  • Spam filteringcoreNot shownNeither the README nor the website mentions it.
  • SearchNot shownNeither the README nor the website mentions it.
  • Labels and filtersNot shownNeither the README nor the website mentions it.
  • Mobile appsYesTuta Mail apps for Android or iPhone
  • Calendar and contacts integrationYesencrypt emails, contacts and calendar entries
  • Large storagePartlyI didn't need 20GB of space
ZeroOpen source email client focused on privacy and safety Same job, different way22%11k+8
11
 16 months agoToo few Needs a server MIT
Covers 1 of 2 core jobs. Not shown: Spam filtering; Search; Labels and filters; Mobile apps; Calendar and contacts integration; Large storage.See the evidence
  • EmailcoreYesAn Open-Source Gmail Alternative for the Future of Email
  • Spam filteringcoreNot shownNeither the README nor the website mentions it.
  • SearchNot shownNeither the README nor the website mentions it.
  • Labels and filtersNot shownNeither the README nor the website mentions it.
  • Mobile appsNot shownNeither the README nor the website mentions it.
  • Calendar and contacts integrationNot shownNeither the README nor the website mentions it.
  • Large storageNot shownNeither the README nor the website mentions it.

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