Monomail

Free plan Android

What Monomail is

Monomail is a monochrome Android email client for up to 10 Gmail, Outlook, or IMAP accounts, with an optional unified inbox. It supports threaded conversations, sender grouping, snooze, scheduled and undo sending, templates, and attachments. Search combines local filtering by subject, sender, and snippet with paginated server-side API search. Local caching through Room and SQLCipher enables offline use. Connections include Gmail, Microsoft Graph for Outlook, and IMAP/SMTP, with presets for Gmail, Outlook, Yahoo, Zoho, and custom providers. PGP tools handle key generation, import and export, decryption, signature verification, and outgoing encryption and signing. The maker says email is processed locally without Monomail servers and sensitive data is encrypted at rest. Monomail is GPL-3.0 licensed with public Kotlin source, and requires Android 8.0 or later. The GitHub/F-Droid build is free.

Who it suits

Monomail suits Android users managing several Gmail, Outlook, or IMAP accounts who want offline access, local processing, and optional encryption. It is intended for personal, non-commercial use rather than enterprise-critical communications.

What it does well

Supports up to 10 accounts
Unified inbox option
Offline caching and search
PGP encryption and signatures
Open-source GPL-3.0 Kotlin project

What to know first

Android 8.0 or later required
GitHub build lacks push notifications
GitHub build restricts Gmail OAuth
Personal, non-commercial use only

Plans

Plan	Billed and limits	Price
GitHub / F-Droid APK	No push notifications · Gmail Google OAuth sign-in restricted; Outlook and IMAP/SMTP work	Free
Google Play Store	Paid open testing · full features	On request

As monomail.millosaurs.me lists them, read 11 Oct 2026. The maker's own page has the final word.

Verdict

Monomail offers a broad Android email toolkit with offline caching, multiple providers, and PGP features. Users choosing the GitHub or F-Droid build should note its push-notification and Gmail sign-in restrictions.

Facts from Monomail's own pages

Accounts: It supports up to 10 Gmail, Outlook, or IMAP accounts with a unified inbox option. · github.com, 11 Oct 2026
App coverage: mobile · monomail.millosaurs.me, 20 Sept 2026
Account limit: 10 · monomail.millosaurs.me, 20 Sept 2026
Email features: Features include threaded conversations, sender grouping, snooze, scheduled send, undo send, templates, and attachments. · github.com, 11 Oct 2026
Encryption: The app supports PGP key generation, import/export, automatic decryption and signature verification, and outgoing encryption and signing. · github.com, 11 Oct 2026
Free plan: Yes · monomail.millosaurs.me, 20 Sept 2026
GitHub build limitation: The maker says the GitHub build restricts Gmail sign-in through Google OAuth, while Outlook and IMAP/SMTP work. · monomail.millosaurs.me, 11 Oct 2026
Integrations: Account connections include Gmail, Microsoft Graph for Outlook, and IMAP/SMTP, with presets for Gmail, Outlook, Yahoo, Zoho, and custom providers. · github.com, 11 Oct 2026
Intended use: The terms say the app is for personal, non-commercial use and is not intended for enterprise or highly critical communications. · monomail.millosaurs.me, 11 Oct 2026
Local security: The maker says sensitive data is encrypted at rest using Android Keystore and encrypted storage, and email data is processed locally without Monomail servers. · monomail.millosaurs.me, 11 Oct 2026
Offline access: Yes · monomail.millosaurs.me, 20 Sept 2026
Offline use: The app uses Room and SQLCipher for local caching and says it works offline. · github.com, 11 Oct 2026
Open source: Monomail is licensed under GPL-3.0 and its Kotlin source is publicly available. · monomail.millosaurs.me, 11 Oct 2026
Platform requirement: The app requires Android 8.0 (API 26) or later. · monomail.millosaurs.me, 11 Oct 2026
Product: Monomail is a monochrome email client for Android. · github.com, 11 Oct 2026
Push notifications: Push support uses Gmail Pub/Sub, Outlook webhooks, and IMAP IDLE; the GitHub build lacks push notifications. · github.com, 11 Oct 2026
Search: Search includes local filtering by subject, sender, and snippet plus paginated server-side API search. · github.com, 11 Oct 2026
Scheduled sending: Yes · monomail.millosaurs.me, 20 Sept 2026
Support: The maker directs users to Discord for updates, bug reports, and developer chat. · monomail.millosaurs.me, 11 Oct 2026
Unified inbox: Yes · monomail.millosaurs.me, 20 Sept 2026

Where Monomail stands on Freedom251

Email clients#49 of 142