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OpenSourceAlternatives

Gmail alternatives

3 projects to consider for your Gmail workflows.

1 custom license · 2 open source

Explore Inbox Zero, Tuta and Twake Mail. Each takes a different approach to your Gmail workflows. Read its capabilities and limitations to find the right fit.

Catalogue facts checked August 31, 2026

Inbox Zero

Open-source AI email assistant that triages Gmail and Outlook

Custom licenseAGPL-3.0 with Inbox Zero Inc. commercial-use termsSelf-hostedManaged hosting

Teams drowning in repetitive Gmail or Outlook mail benefit most from Inbox Zero. Its AI agent categorises messages, drafts answers, and clears bulk mail inside the mailbox people already use. The hosted plans start at $20 per user per month with metered AI credits, so purely cost-driven individuals should look elsewhere. If you want AI triage without leaving Gmail, choose Inbox Zero; if you want a different mail service entirely, choose an alternative like HEY instead.[1][2][3]

Good fit. If the inbox fills faster than you can triage, the AI categorisation and bulk cleanup directly attack the backlog.[1][2]

Keep in mind. Hosted use starts at $20 per user per month with metered AI credits, so free-mail users pay for the convenience.[1]

Repository review signals: unknown status, stale · Observed October 11, 2026.

Sources and editorial review

Source research. Reviewed on October 11, 2026. Written by Sanjib Sah. AI assisted; reviewed by a human editor.

We have not run or tested this product.

  1. Inbox Zero: AI personal assistant for email

    official · Observed October 11, 2026

    Positioning, mailbox connections, feature list, plan lineup, trial terms; vendor quotes not used as testimonials.

  2. Inbox Zero pricing

    official · Observed October 11, 2026

    Plan prices, billing periods, trial, AI credits, Enterprise/SSO/support terms.

  3. elie222/inbox-zero repository

    official · Observed October 11, 2026

    Feature catalogue, self-host/API/OAuth docs, tech stack, repo health signals as observed.

Tuta

Encrypted email, calendar and contacts with open-source apps

Open sourceGPL-3.0Managed hosting

Encrypted hosted mail with open-source apps and a usable free tier. Tuta suits readers who want end-to-end encrypted email, calendar and contacts without tracking, delivered through open-source GPLv3 clients with German hosting. Its free tier covers basic private mail, while custom domains and larger storage need a paid plan. It is not suitable for anyone who needs to self-host the server.[1][2][3]

Good fit. The free tier and the explicit positioning against Gmail suit individuals who want encrypted mail without tracking. This is an editorial inference from the plans and comparison page, not a vendor-stated recommendation.[1][2]

Keep in mind. Only the clients are published as open source; the service runs on Tuta's own infrastructure and no self-hosted server deployment is documented. Teams that require running their own mail server should look elsewhere.[1][2]

Repository review signals: unknown status, stale · Observed October 13, 2026.

Sources and editorial review

Source research. Reviewed on October 13, 2026. Written by Sanjib Sah. AI assisted; reviewed by a human editor.

We have not run or tested this product.

  1. Tuta homepage

    official · Observed October 13, 2026

    Official homepage observed for product name, positioning and scope of service.

  2. Tuta pricing

    official · Observed October 13, 2026

    Pricing tiers, storage, domains, support and server location observed from the plan tables.

  3. Tuta open source

    official · Observed October 13, 2026

    GPLv3 client licensing, platform list and audit statement observed from the open-source page.

  4. Tuta email comparison

    official · Observed October 13, 2026

    Replacement positioning against Gmail and other providers observed from the official comparison.

Twake Mail

Open-source JMAP email client for web, Android, and iOS

Open sourceAGPL-3.0Self-hosted

Open-source JMAP mail with self-hosting trade-offs Twake Mail is a credible open-source alternative to Gmail-style hosted mail for teams that can run a JMAP backend: AGPL-3.0 code, web and mobile clients, PGP encryption, and Docker self-hosting. The trade-off is operator effort, since setup needs JWT keys, a JMAP server, and provisioning, and several enterprise facts remain undocumented.[1][2][3]

Good fit. Inference: teams that want a self-hosted, AGPL-licensed mailbox with PGP encryption fit Twake Mail's documented security and Docker self-hosting design.[1][2]

Keep in mind. Inference: JWT key generation, a JMAP backend, and account provisioning put self-hosting above one-click installs for operators.[1]

Repository review signals: unknown status, stale · Observed October 13, 2026.

Sources and editorial review

Source research. Reviewed on October 13, 2026. Written by Sanjib Sah. AI assisted; reviewed by a human editor.

We have not run or tested this product.

  1. Twake Mail official site

    official · Observed October 13, 2026

    Official Twake Mail product site: secure professional open-source email by Linagora; JMAP efficiency claims; PGP encryption, spam shield, custom filters, enhanced search; web, Android, iOS availability; on-premise positioning.

  2. linagora/tmail-flutter README

    official · Observed October 13, 2026

    Repository README: Twake Mail Client by Linagora; multi-platform Flutter JMAP email app; Android, iOS, Docker web images; works with any JMAP server; docker run and compose setup with demo accounts.

  3. linagora/tmail-flutter LICENSE

    official · Observed October 13, 2026

    Repository LICENSE file text: GNU Affero General Public License version 3.

Compare Gmail alternatives

Known catalogue facts at a glance. Columns with no reviewed values are omitted. “Not reviewed” means unknown, not that a capability is absent.

Known facts for Gmail alternatives
ProjectLicense policyHostingDeploymentEnterprise supportBest fit
Inbox ZeroAGPL-3.0 with Inbox Zero Inc. commercial-use terms · customSelf-hosted + ManagedmoderateYesGmail and Outlook users clearing a crowded inbox with AI triage; People automating repetitive replies, follow-ups, and scheduling
TutaGPL-3.0 · OSI-approvedManagedNot reviewedYesIndividuals replacing Gmail with encrypted email; Small teams wanting GDPR-friendly hosted email
Twake MailAGPL-3.0 · OSI-approvedSelf-hostedmoderateNot reviewedPeople who want a self-hosted open-source email client; Teams adopting JMAP-based mail on web and mobile

Before you switch

  • Check that the project covers the workflows and data you need to move.
  • Confirm that the license terms fit how you plan to run, modify, and distribute it.
  • Choose between self-hosting responsibility and a reviewed managed option.
  • Open the project page for repository freshness, review dates, and any unresolved requirements.
About Gmail

Gmail's search is still the reason to use it. Conversation threading, effectively unlimited retention on paid plans, and spam filtering that most self-hosted setups cannot match make it the default even for people uncomfortable with the arrangement.

The arrangement is that Google processes the contents of your correspondence to run the service. Business plans remove advertising from the equation, but not the processing.

Google · Free for personal use, Workspace from $7/user/month · Checked August 31, 2026

Official website
How this list is ordered

Recommended · Organic catalogue order.

A deterministic editorial score using relationship confidence, category fit, logarithmic popularity, as-of maintenance and freshness, with bounded anomaly quarantine and known-data penalties. Payment is fixed at zero.

Payment does not affect organic ranking. Order is a starting point, not a universal recommendation.

OpenAlternative organic alternatives v4 · version 4

Alternatives to Gmail: Open Source and More | OpenSourceAlternatives