Top pick · highest health
Roundcube
Browser-based IMAP client with an application-like user interface.
★ 7.3k 103 commits / 90d ⟳ 5 days ago GPL-3.0
Category
Open source communication - email - webmail clients
Webmail clients. This page ranks 4 open-source webmail clients projects by a health score recomputed every night from repository data; nothing else affects the order. Roundcube leads at 85/100 with 103 commits in the last 90 days and 7.3k stars, followed by Cypht (83) and SnappyMail (83). 3 of the 4 score 70 or above, 0 publish a Docker image, and the median health is 83. GPL-3.0 is the most common licence, carried by 1 of them. The score weighs commits in the last 90 days, release recency, stars, archive status and Docker support; a low number means low measurable activity, not low quality, so a finished, stable tool can legitimately sit lower down.
updated Oct 2026 4 tools ★ 11k stars 0 with Docker median 83
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Ranked by health
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SnappyMail
Simple, modern, lightweight & fast web-based email client (fork of RainLoop).
★ 1.7k 87 commits / 90d ⟳ yesterday AGPL-3.0
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| # | ||||||
|---|---|---|---|---|---|---|
| 1 | Roundcube | 7.3k | 103 | GPL-3.0 | 5 days ago | |
| 2 | Cypht | 1.8k | 161 | LGPL-2.1 | 4 days ago | |
| 3 | SnappyMail | 1.7k | 87 | AGPL-3.0 | yesterday | |
| 4 | SquirrelMail | 0 | 0 | GPL-2.0 | unknown |
How the webmail client tools compare
Roundcube edges Cypht 85 to 83, and most of the difference is stars: 7.3k stars against 1.8k stars. Cypht is the busier codebase, though, with 161 commits in 90 days to 103.
The most recent release is SnappyMail v2.38.2.1, published 7 days ago. None of the measured options scores under 40. By stack, PHP (4) is the most common. Roundcube, Cypht, SnappyMail and 1 more are copyleft. SquirrelMail is not hosted on a forge Repoly can read, so it has no measured score yet.
Communication - Email - Webmail Clients: common questions
What is the best open source webmail client tool?
By Repoly's GitHub health score, Roundcube at 85/100 (103 commits in 90 days, 1.7.5 from 11 days ago). Cypht is next at 83; Roundcube's lead comes mostly from stars. The score measures maintenance, not features, so shortlist the top few and try them.
Which webmail client tools are the most actively developed?
Cypht (161 commits in 90 days), Roundcube (103 commits in 90 days) and SnappyMail (87 commits in 90 days). Commit activity is 35 of the 100 health points, the largest single term.
Which webmail client tools can I run in Docker?
None of the 4 advertise Docker support, so plan for a native install.
Which webmail client tools have a permissive licence?
None; 4 of 4 are copyleft, which requires publishing changes to a modified version you distribute.