Conjoon review
A focused, open-source web client for self-hosted multi-account email.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Conjoon is an open-source JavaScript email client for individuals and developers who want browser-based access to multiple email accounts. Deployed through a web server, it provides a single interface for account management and uses a separate backend for IMAP and SMTP operations. Its focus is email access rather than a broader productivity suite, making it a fit for self-hosters and teams building messaging or groupware solutions around a web interface.
Account connectivity is a central strength. Conjoon supports IMAP and SMTP through REST API operations, with provider presets for Gmail, Outlook, AOL, Yahoo, Freenet, GMX, and web.de. The configurable JavaScript frontend can be served from a web server, while mailto protocol handling, new-message polling, desktop notifications, and lazy loading of email preview text add useful browser-oriented features. Official builds and npm-based setup provide two installation paths, though either approach still requires the product’s web-server deployment model and backend arrangement.
Conjoon is most suitable when browser access, self-hosting, and multi-account coverage matter more than offline work or adjacent planning tools. Its open-source model and REST API make it relevant for developers incorporating email into a wider messaging or groupware solution. Buyers looking for a focused web client should find its scope clear; those needing verified calendar, scheduling, or offline capabilities should choose a different email product. The result is a practical fit for self-managed deployments with core IMAP and SMTP requirements, rather than a complete personal information manager.
Conjoon pros and cons
- Where it wins
- Manages multiple email accounts in one browser interface
- Supports IMAP and SMTP through a REST API backend
- Includes provider presets and desktop notifications
- Where it doesn't
- Requires deployment through a web server and separate backend
- Does not provide verified offline email access
- Calendar and scheduling features are not part of its core offering
Conjoon fact sheet, pricing and score →
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