Fastmail for Business vs addy.io
In short: addy.io wins on privacy, addy.io wins on price, and Fastmail for Business wins on features. The full comparison is below, last checked 25 October 2026.
Which should you choose?
- Fastmail for Business is the better pick if you want more space for your mail: 50 GB; the choice of any mail app over IMAP; and a calendar and contacts alongside your mail.
- addy.io suits you best if you want to pay less: About $1 a month, yearly; a free plan before you pay anything; and open-source apps.
| Feature | Fastmail for Business | addy.io |
|---|---|---|
| Overall | 3.0 | 4.0 |
| Privacy | 2.0 | 3.5 |
| Price | 3.5 | 5.0 |
| Features | 5.0 | Not rated |
| Cheapest plan | Standard $5 per user a month ($4.17 yearly) | Lite About $1 a month, yearly |
| Free plan | No | Yes |
| Storage | 50 GB | Forwards only |
| Your own domain | ✓ Up to 100 | ✓ Yes |
| End-to-end encryption | No | No |
| Company based in | Australia | United Kingdom |
| Your data is kept in | EU (Amsterdam) for UK customers, with a US replica and US backups | EU |
| Founded | 1999 | 2018 |
| Free trial | 30 days free | Free plan |
| Funded by advertising | No | No |
| Works in any mail app | ✓ IMAP and SMTP | No, its own apps only |
| Calendar and contacts | ✓ Yes | No |
| Aliases | Yes | Unlimited aliases |
| Open-source apps | No | ✓ Yes |
| Sign up without ID | No | ✓ Yes |
| White label | No | No |
| Reader offer | Offer 10% off your first year, plus a free trial of up to 30 days | None |
| Last checked | 22 October 2026 | 25 October 2026 |
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The key differences
- Fastmail for Business's cheapest plan is Standard ($5 per user a month ($4.17 yearly)); addy.io's is Lite (About $1 a month, yearly).
- For free, Fastmail for Business gives you no free plan, and addy.io a free plan ().
- Fastmail for Business comes with 50 GB of storage and addy.io with no storage, as it forwards mail on.
- Fastmail for Business keeps your mail in the EU (Amsterdam) for UK customers, with a US replica and US backups, while addy.io keeps it in the EU.
- Fastmail for Business is based in Australia and addy.io in the United Kingdom, so different privacy laws apply.
- Fastmail for Business works in any mail app over IMAP, and addy.io only works in its own apps.
- For extra addresses, Fastmail for Business has yes and addy.io has unlimited aliases.
Fastmail for Business and addy.io: your questions
Which is more private, Fastmail for Business or addy.io?
addy.io scores 3.5 out of 5 for privacy and Fastmail for Business 2. addy.io gives you open-source apps and an account that doesn't need your phone number or ID.
Which is cheaper, Fastmail for Business or addy.io?
addy.io is cheaper. Its Lite plan is About $1 a month, yearly, against $5 per user a month ($4.17 yearly) for Fastmail for Business's Standard. addy.io also has a free plan. Check the renewal price before you pay, as some first-year prices go up.
Do Fastmail for Business and addy.io work with my own domain?
Yes, both do. Fastmail for Business: Up to 100. addy.io: Yes.
Where do Fastmail for Business and addy.io keep my email?
Fastmail for Business keeps it in the EU (Amsterdam) for UK customers, with a US replica and US backups. addy.io keeps it in the EU.
Do Fastmail for Business and addy.io work in other mail apps?
Fastmail for Business works in any mail app over IMAP. addy.io only works in its own apps.
Recent price changes
Neither price has changed since my first check on 22 October 2026.
The latest headlines: Fastmail for Business news · addy.io news.
Alternatives to Fastmail for Business and addy.io
Fastmail for Business vs mailbox.org · addy.io vs mailbox.org · Fastmail for Business vs Posteo · addy.io vs Posteo · Fastmail for Business vs Proton Mail · addy.io vs Proton Mail
How to switch
Whichever you choose, the move follows the same steps. Pick your two providers for the steps.