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mailbox alternatives · Email

Free alternatives to mailbox

mailbox has no free plan. 30 of the 51 other email apps in this directory are free or have a free plan.

mailbox is a paid product with a free trial, starting at €1 per month, annual payment only (€12 a year, Light). 4 of them have no paid plan at all; the rest pair a free plan with paid ones.

30 tools · Listings checked up to Oct 9, 2026 · Where the facts come from

The 12 closest to mailbox

  1. Tuta Mail

    End-to-end encrypted email and calendar from Germany

    What is free: 1 GB of storage, one calendar and 3 labels, with end-to-end encryption. Free accounts are deleted after more than six months without a login.

    • Tuta Mail starts at €3 per month, paid yearly (lowest paid personal plan). mailbox starts at €1 per month, annual payment only (€12 a year, Light).
    • Tuta Mail has a free plan. mailbox does not, though it has a free trial.
    • Only Tuta Mail lists Windows, macOS, Linux, iOS and Android apps.
    • Tuta Mail is open source, according to its own site.
    Tuta Mail vs mailboxTuta Mail pricing and details

  2. Proton Mail

    End-to-end encrypted email service based in Switzerland

    What is free: Proton Free: 1 email address, up to 1 GB of mail storage (500 MB until the setup steps are completed), a limit of 150 sent messages a day and 3 personal calendars.

    • Proton Mail starts at $3.99 per month, billed every 12 months ($47.88); $4.99 billed monthly. mailbox starts at €1 per month, annual payment only (€12 a year, Light).
    • Proton Mail has a free plan. mailbox does not, though it has a free trial.
    • Only Proton Mail lists macOS, Windows, Linux, iOS and Android apps.
    • Proton Mail is open source, according to its own site.
    Proton Mail vs mailboxProton Mail pricing and details

  3. Mailfence

    Private email from Belgium with built-in OpenPGP encryption

    What is free: 1 GB in total (500 MB of email, 500 MB of documents) with encryption and the iOS and Android apps. Support is the knowledge base only, and inactive free accounts are suspended after 7 months.

    • Mailfence starts at €2.50 per month, billed yearly (Base). mailbox starts at €1 per month, annual payment only (€12 a year, Light).
    • Mailfence has a free plan. mailbox does not, though it has a free trial.
    • Only Mailfence lists iOS and Android apps.
    • mailbox also covers tasks, video calls and file sync.
    Mailfence vs mailboxMailfence pricing and details

  4. Zoho Mail

    Ad-free business email hosting with calendar, tasks and notes

    What is free: Forever Free Plan: email hosting for one domain and up to 5 users, with 5 GB of mail storage each. IMAP, POP and ActiveSync are not included, and it is available only in select data centers.

    • Zoho Mail starts at $1 per user / month, billed annually (Mail Lite, 5 GB). mailbox starts at €1 per month, annual payment only (€12 a year, Light).
    • Zoho Mail has a free plan. mailbox does not, though it has a free trial.
    • Only Zoho Mail lists macOS, Windows, Linux, iOS and Android apps.
    • mailbox is end-to-end encrypted, according to its own site.
    Zoho Mail vs mailboxZoho Mail pricing and details

  5. Spike

    Chat-style email app with team chat, notes, tasks and video calls

    What is free: Email App Free: 1 email address, 60 days of search history and 1 GB of notes storage. Teamspace Starter: free for up to 3 members with 15 GB each. Both get 10 queries per AI feature.

    • Spike starts at $4 per member / month, billed annually (Teamspace Team); Email App Pro is $6. mailbox starts at €1 per month, annual payment only (€12 a year, Light).
    • Spike has a free plan. mailbox does not, though it has a free trial.
    • Only Spike lists macOS, Windows, iOS and Android apps.
    • mailbox is end-to-end encrypted, according to its own site.
    Spike pricing and details

  6. Microsoft Outlook

    Microsoft's email and calendar app for desktop, mobile and web

    What is free: Free Outlook for 1 person: email and calendar on the web, desktop and mobile apps, 15 GB of mailbox storage, 5 GB of cloud storage and core spam filtering. The free inbox shows ads.

    • Microsoft Outlook starts at $1.99 per month, or $19.99 per year (Microsoft 365 Basic). mailbox starts at €1 per month, annual payment only (€12 a year, Light).
    • Microsoft Outlook has a free plan. mailbox does not, though it has a free trial.
    • Only Microsoft Outlook lists Windows, macOS, iOS and Android apps.
    • mailbox is end-to-end encrypted, according to its own site.
    Microsoft Outlook pricing and details

  7. Thunderbird

    Free, open-source email app for Windows, macOS, Linux and Android

    What is free: Everything. There is no paid plan.

    • Thunderbird is free. mailbox starts at €1 per month, annual payment only (€12 a year, Light).
    • Thunderbird has a free plan. mailbox does not, though it has a free trial.
    • Only Thunderbird lists Windows, macOS, Linux and Android apps.
    • Only mailbox lists a web app.
    Thunderbird pricing and details

  8. Canary Mail

    AI email client with PGP encryption for Mac, iOS, Windows, Android

    What is free: Free forever on up to 2 devices: unified inbox, unlimited mail accounts, snooze and pin, email templates, Inbox Zero tools and lite read receipts.

    • Canary Mail starts at $36 per year (Growth), shown as $3 per month billed yearly. mailbox starts at €1 per month, annual payment only (€12 a year, Light).
    • Canary Mail has a free plan. mailbox does not, though it has a free trial.
    • Only Canary Mail lists macOS, iOS, Windows and Android apps.
    • Only mailbox lists a web app.
    Canary Mail pricing and details

  9. eM Client

    Desktop email client for Windows and Mac with calendar and chat

    What is free: Free license for personal, non-commercial use: 2 email accounts on one device, with email, calendar, contacts and tasks. The Android and iOS apps are free and need no license.

    • eM Client starts at $39.95 per year (Personal subscription, up to 3 devices). mailbox starts at €1 per month, annual payment only (€12 a year, Light).
    • eM Client has a free plan. mailbox does not, though it has a free trial.
    • Only eM Client lists Windows, macOS, iOS and Android apps.
    • Only mailbox lists a web app.
    eM Client pricing and details

  10. BlueMail

    Cross-platform email client with a unified inbox and built-in AI

    What is free: Personal plan, free for individual use: unlimited email accounts, unified inbox, Clusters, MagicSync and PGP encryption on every platform. GemAI and desktop email backup are not included.

    • BlueMail starts at $35.99 per year (Plus, shown as $3 per month billed annually). mailbox starts at €1 per month, annual payment only (€12 a year, Light).
    • BlueMail has a free plan. mailbox does not, though it has a free trial.
    • Only BlueMail lists iOS, Android, macOS, Windows and Linux apps.
    • Only mailbox lists a web app.
    BlueMail pricing and details

  11. Wino Mail

    Free, open source mail and calendar app for Windows

    What is free: Wino Mail is always free with no Wino Account needed: Mail, Calendar, Contacts and To Do, all core customization options and up to 3 email accounts.

    • Wino Mail has a free plan. mailbox does not, though it has a free trial.
    • Only Wino Mail lists a Windows app.
    • Only mailbox lists a web app.
    • Wino Mail is open source, according to its own site.
    Wino Mail pricing and details

  12. Spark Mail

    Email client with a unified smart inbox, AI tools and team features

    What is free: Unlimited email accounts in a unified Smart Inbox with snooze, send later, reminders and calendar, plus 5 AI meeting notes in total and an AI Assistant preview limited to 1 month of email history.

    • Spark Mail starts at $8.25 per user / month, billed annually ($99 / year). mailbox starts at €1 per month, annual payment only (€12 a year, Light).
    • Spark Mail has a free plan. mailbox does not, though it has a free trial.
    • Only Spark Mail lists macOS, Windows, iOS and Android apps.
    • Only mailbox lists a web app.
    Spark Mail pricing and details

18 more that are free or have a free plan

All 30 in one table

Common questions

Is there a free alternative to mailbox?

Yes. Tuta Mail, Proton Mail, Mailfence, Zoho Mail, Spike, Microsoft Outlook, Thunderbird, Canary Mail and 22 more are free or have a free plan.

Does mailbox have a free plan?

mailbox has no free plan. mailbox is a paid product with a free trial, starting at €1 per month, annual payment only (€12 a year, Light).

When was this checked?

Each listing shows its own date. On this page they run from Oct 4, 2026 to Oct 9, 2026. Vendors change prices and plans without notice, so confirm on their site before you buy.

This page is built from the listings. A tool is here because its listing says so, and the order is how close each is to mailbox: the alternatives its listing names first, then the tools that share the most features with it.