Proton Mail for Business vs IONOS Mail
In short: Proton Mail for Business wins on privacy, IONOS Mail wins on price, and Proton Mail for Business wins on features. The full comparison is below, last checked 22 October 2026.
Which should you choose?
- Proton Mail for Business suits you best if you want mail that's encrypted end to end without any setup; more room (15 GB, against 2 GB); and calendar and contacts in the same account.
- Choose IONOS Mail if you want a cheaper plan, at About £1–£2 a month (not confirmed); freedom to use the mail app you already like; and a provider that's been going since 1988.
| Feature | Proton Mail for Business | IONOS Mail |
|---|---|---|
| Overall | 4.0 | 3.0 |
| Privacy | 4.5 | 2.5 |
| Price | 2.5 | 4.5 |
| Features | 4.5 | 3.0 |
| Cheapest plan | Mail Essentials $6.99 per user a month | Mail Basic About £1–£2 a month (not confirmed) |
| Free plan | No | No |
| Storage | 15 GB | 2 GB |
| Your own domain | ✓ 3 | ✓ Yes |
| End-to-end encryption | ✓ Built in | No |
| Company based in | Switzerland | Germany |
| Your data is kept in | Switzerland | UK data centre in Worcester; where email sits not confirmed |
| Founded | 2014 | 1988 |
| Free trial | 30-day refund | Unknown |
| Funded by advertising | No | No |
| Works in any mail app | With Proton Bridge on paid plans | ✓ IMAP and SMTP |
| Calendar and contacts | ✓ Yes | No |
| Aliases | Yes | Yes |
| Open-source apps | ✓ Yes | No |
| Sign up without ID | No | No |
| White label | No | Unknown |
| Reader offer | None | None |
| Last checked | 22 October 2026 | 22 October 2026 |
Want to add another? Open this in the compare tool.
The key differences
- Cheapest plans: Proton Mail for Business Mail Essentials, $6.99 per user a month. IONOS Mail Mail Basic, About £1–£2 a month (not confirmed).
- Space: Proton Mail for Business gives 15 GB of storage, IONOS Mail 2 GB of storage.
- Your mail is stored in Switzerland with Proton Mail for Business, and in the UK data centre in Worcester; where email sits not confirmed with IONOS Mail.
- The companies sit under different laws: Proton Mail for Business in Switzerland, IONOS Mail in Germany.
- On encryption, Proton Mail for Business encrypts mail end to end, whereas IONOS Mail doesn't encrypt mail end to end.
- Mail apps: Proton Mail for Business works in other mail apps through Proton Bridge on paid plans; IONOS Mail works in any mail app over IMAP.
Common questions
Is Proton Mail for Business more private than IONOS Mail?
Proton Mail for Business scores 4.5 out of 5 for privacy and IONOS Mail 2.5. Proton Mail for Business gives you mail that's encrypted end to end without any setup and open-source apps.
Is Proton Mail for Business cheaper than IONOS Mail?
IONOS Mail is cheaper. Its Mail Basic plan is About £1–£2 a month (not confirmed), against $6.99 per user a month for Proton Mail for Business's Mail Essentials. Check the renewal price before you pay, as some first-year prices go up.
Can I use my own domain with Proton Mail for Business or IONOS Mail?
Yes, both do. Proton Mail for Business: 3 domains on its cheapest plan that allows one. IONOS Mail: Yes.
Where is my email stored with Proton Mail for Business and IONOS Mail?
Proton Mail for Business keeps it in Switzerland. IONOS Mail keeps it in the UK data centre in Worcester; where email sits not confirmed.
Can I use Proton Mail for Business and IONOS Mail in Apple Mail or Outlook?
Proton Mail for Business works in other mail apps through Proton Bridge on paid plans. IONOS Mail works in any mail app over IMAP.
Recent price changes
No price changes for either since 22 October 2026. I check regularly and add any change here with its date.
The latest headlines: Proton Mail for Business news · IONOS Mail news.
Also worth a look
Proton Mail for Business vs mailbox.org · IONOS Mail vs mailbox.org · Proton Mail for Business vs Posteo · IONOS Mail vs Posteo · Proton Mail for Business vs Proton Mail · IONOS Mail vs Proton Mail
Moving your email
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