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Head-to-head · Secure Email Providers

Proton Mail vs Mailo

  • Updated Oct 2026
  • Both researched from official sources
  • 6 checks side by side
Higher score Proton Mail #1 in Secure Email Providers 9.4/10 Free plan Free plan✓ 3 of 3 features Visit Proton Mail
Mailo #8 in Secure Email Providers 7.9/10 Free plan Free plan✓ 2 of 3 features Visit Mailo

Proton Mail leads on 0 checks, Mailo on 2, and 4 are even. Who comes out ahead on the 6 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreProton Mail · 9.4/10
  • Free planboth
  • Most featuresProton Mail · 3 of 3

Proton Mail scores higher on our rubric for secure email providers: 9.4 against 7.9 out of 10; our editors rank them #1 and #8.

Mailo leads on mailbox storage: 20 GB versus 15 GB. Mailo leads on email aliases: 100 aliases versus 10 aliases. On mail protocol support, Mailo gives you Imap_smtp where Proton Mail offers Bridge.

Proton Mail is the better fit for most users seeking a complete secure email suite. Mailo is the better fit for high-storage freemium email users.

  • Proton Mail fits best

    Most users seeking a complete secure email suite

  • Mailo fits best

    High-storage freemium email users

Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.

Side by side

Feature Proton Mail 9.4/10 Visit ↗ Mailo 7.9/10 Visit ↗
At a glance
Editor score 9.4 7.9
Ranking #1 in Secure Email Providers #8 in Secure Email Providers
Best for Most users seeking a complete secure email suite High-storage freemium email users
Pricing model Free plan + paid Free plan + paid
Starting price — €1.50/user/mo
Free plan ✓ ✓
Free trial — —
Deployment Cloud, Desktop, Mobile Cloud, Mobile
Platforms Web, Windows, macOS, Linux, iOS, Android Web, iOS, Android
Features Proton Mail 3/3 · Mailo 2/3
End-to-end encryption ✓ ✓
Custom domain ✓ ✓
Encrypted calendar ✓ (best) Not checked yet
Specs
Mailbox storage 15 GB 20 GB (best)
Email aliases 10 aliases 100 aliases (best)
Mail protocol support Bridge Imap_smtp
Our review
Pros
  • End-to-end encryption and zero-access storage protect messages and attachments
  • Free plan includes 1 GB storage and 1 encrypted email address
  • Bridge connects desktop clients including Outlook, Thunderbird, and Apple Mail
  • 20 GB mailbox storage on the Premium plan
  • Up to 100 aliases and custom domain email addresses
  • PGP, two-factor authentication and mail-client access
Cons
  • Custom domains and expanded storage require a paid plan
  • Some desktop-client features depend on Proton Mail Bridge
  • Advanced plans may offer more capacity than light email users need
  • The free plan includes advertising banners
  • Mailo Free provides only 1 GB of mailbox storage
  • The positioning emphasizes limited platform coverage and no integrations
Our verdict

Proton Mail is an encrypted email service for individuals, organizations, journalists, activists, and businesses. It combines end-to-end encryption for messages between Proton Mail users with zero-access encryption for stored messages and…

Read the review →

Mailo is a French email and cloud service for individuals, families, organizations and professionals. It combines webmail with calendars, address books, document and photo storage, sharing tools, mobile access and synchronization through…

Read the review →
  1. Proton MailSecure Email Providers 9.4Free plan
  2. MailoSecure Email Providers 7.9Free plan

Strengths and trade-offs

  • Proton Mail — where it wins

    • End-to-end encryption and zero-access storage protect messages and attachments
    • Free plan includes 1 GB storage and 1 encrypted email address
    • Bridge connects desktop clients including Outlook, Thunderbird, and Apple Mail

    Where it doesn't

    • Custom domains and expanded storage require a paid plan
    • Some desktop-client features depend on Proton Mail Bridge
    • Advanced plans may offer more capacity than light email users need

  • Mailo — where it wins

    • 20 GB mailbox storage on the Premium plan
    • Up to 100 aliases and custom domain email addresses
    • PGP, two-factor authentication and mail-client access

    Where it doesn't

    • The free plan includes advertising banners
    • Mailo Free provides only 1 GB of mailbox storage
    • The positioning emphasizes limited platform coverage and no integrations

More comparisons

All secure email providers comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update