Fastmail vs Proton Mail Plus

Price, free plan and alternatives, side by side

The comparison in short

Cheapest per year

Proton Mail Plus

$47.88/yr

20% less than Fastmail

Who has a free plan
  • Fastmailno free plan
  • Proton Mail Plushas a free plan
Easiest to rebuild

Fastmail, Proton Mail Plus

Worth subscribing

On price, Proton Mail Plus wins. To start without paying, Proton Mail Plus has a free plan.

Side-by-side comparison

APPLICATIONFastmailEmailProton Mail PlusEmail
Monthly billing$6/moIndividual$4.99/moMail Plus
Per year$60/yrannual plan · −17%$47.88/yrannual plan · −20%
Billing modelFlat subscriptionFlat subscription
Free tierno free tier; up to 30-day free trial1 user; 1 email address; 500 MB Mail storage expandable to 1 GB; 150 messages/day; 25 MB attachment limit
Additional costsTaxes are extra; paid storage upgrades are available up to 300 GB per user but public add-on prices were not shown; registering a custom domain costs extra if you do not already own one.Paid 'unlimited' sending excludes bulk, promotional and programmatic mail, and each recipient counts separately. Downgrading while above the free storage cap restricts account functions until usage is reduced; custom domains must be bought separately.
Can you rebuild it?Worth subscribingclosest consolation build: one sittingWorth subscribingnot a true replacement; consolation build in one to two days
Free alternatives+3—
Checked on10/20/202610/20/2026
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Prices from each app’s latest check; confirm on the official site before buying.