Cypht is a free, open-source webmail client that unifies multiple email accounts, RSS feeds and calendars into one inbox. See features and alternatives.
Category
Communication
Pricing
Free / Open Source, from Free
Verified
Not yet
Last updated
July 18, 2026
Founded
2014
Free PlanWeb AppOpen SourceSelf-Hosted
Overview
Cypht is a free, open-source webmail client created by Jason Munro, the developer behind the earlier Hastymail projects, with its first commit dating to February 2014. It is licensed under LGPL v2.1 and has been a community-driven project since June 2023.
Built in PHP and JavaScript, Cypht is designed to be lightweight and to unify multiple email accounts, protocols, and RSS feeds into a single inbox rather than serving as a full groupware suite.
Key Features
Cypht supports IMAP, SMTP, JMAP and EWS protocols simultaneously, letting one installation aggregate accounts from different backend mail systems, and can also display RSS and Atom feeds alongside email in unified views.
A plugin-based module-set architecture, fast cross-account search, Sieve server-side filtering, and LDAP directory lookups round out its feature set for self-hosted deployments.
Pricing
Cypht is completely free and open source with no commercial tier. It can be self-hosted on any standard PHP-capable server at no licensing cost.
There is no vendor-provided hosted version; users or organizations are responsible for their own hosting and maintenance.
Key Features
Unified Multi-Account Inbox — Combined inbox, unread, sent and flagged views across multiple email accounts.
RSS/Atom Feed Aggregation — Displays RSS and Atom feeds alongside email in the same unified views.
Cross-Account Search — Fast search that queries across all connected accounts and feeds at once.
IMAP, JMAP & EWS Protocol Support — Connects to traditional IMAP/SMTP servers, modern JMAP providers, and Exchange via EWS.
Sieve Server-Side Filtering — Mail filtering rules that apply even when the user is not logged in.
Plugin-Based Module Set Architecture — Independent plugins executed by a small core framework for extensibility.
LDAP Directory Lookups — Address book and contact lookups via LDAP integration.
Lightweight PHP/JS Footprint — Designed for fast performance on low-resource hosting.
Pros & Cons
Pros
Completely free and open source (LGPL v2.1)
Aggregates multiple email accounts, protocols and RSS feeds in one inbox
Lightweight, fast, and low resource usage on the hosting server
Supports modern (JMAP) and legacy (IMAP/EWS) mail protocols side by side
Cons
No commercial support or SLA; community-maintained only
Minimal interface with fewer built-in groupware features than Roundcube or SOGo
Requires self-hosting and technical setup; no hosted SaaS version offered by the project itself
Smaller contributor community than more established open-source webmail projects
Pricing
Community Free N/A
Frequently Asked Questions
Is Cypht free?
Yes, Cypht is completely free and open source under the LGPL v2.1 license.
What email protocols does Cypht support?
IMAP, SMTP, JMAP and EWS (Exchange Web Services), plus RSS/Atom feed aggregation.
Who created Cypht?
Cypht was created by developer Jason Munro, who previously built the Hastymail webmail projects.
Can Cypht read RSS feeds?
Yes, Cypht can aggregate RSS and Atom feeds alongside email accounts in unified views.
Is Cypht still maintained?
Yes; ownership shifted to a community-driven model in June 2023 and development continues on GitHub.
What are Cypht's alternatives?
Roundcube, SOGo, and Rainloop are commonly compared self-hosted open-source webmail alternatives.