Firefox Relay vs Krystal
On privacy it's Krystal. On price it's Firefox Relay. On features it's Krystal. Here's everything side by side, last checked 25 October 2026.
Which should you choose?
- Firefox Relay is the better pick if you want a free plan before you pay anything and apps whose code is public.
- Krystal suits you best if you want your mail kept in the United Kingdom; an address on your own domain; and the choice of any mail app over IMAP.
| Feature | Firefox Relay | Krystal |
|---|---|---|
| Overall | 2.5 | Not rated |
| Privacy | 1.0 | 2.5 |
| Price | 5.0 | Not rated |
| Features | Not rated | 4.5 |
| Cheapest plan | Premium $0.99 a month | Email hosting Not confirmed |
| Free plan | Yes, 5 aliases | No |
| Storage | Forwards only | Not confirmed |
| Your own domain | Own subdomain only | ✓ Yes |
| End-to-end encryption | No | No |
| Company based in | United States (Mozilla) | United Kingdom |
| Your data is kept in | United States | United Kingdom |
| Founded | 2020 | 2002 |
| Free trial | Free plan | 60-day money-back guarantee |
| Funded by advertising | No | No |
| Works in any mail app | No, its own apps only | ✓ IMAP and SMTP |
| Calendar and contacts | No | ✓ Yes |
| Aliases | Unlimited aliases | Yes |
| Open-source apps | ✓ Yes | No |
| Sign up without ID | No | No |
| White label | No | Unknown |
| Reader offer | None | None |
| Last checked | 25 October 2026 | 25 October 2026 |
Want to add another? Open this in the compare tool.
The key differences
- Firefox Relay's cheapest plan is Premium ($0.99 a month); Krystal's is Email hosting (Not confirmed).
- For free, Firefox Relay gives you a free plan (5 aliases), and Krystal no free plan.
- Firefox Relay comes with no storage, as it forwards mail on and Krystal with storage not confirmed.
- Firefox Relay keeps your mail in the United States, while Krystal keeps it in the United Kingdom.
- Firefox Relay is based in the United States (Mozilla) and Krystal in the United Kingdom, so different privacy laws apply.
- Krystal lets you bring your own domain name; Firefox Relay doesn't.
- Firefox Relay only works in its own apps, and Krystal works in any mail app over IMAP.
- For extra addresses, Firefox Relay has unlimited aliases and Krystal has yes.
Questions people ask
Which is more private, Firefox Relay or Krystal?
Krystal scores 2.5 out of 5 for privacy and Firefox Relay 1. Krystal gives you your mail kept in the United Kingdom.
Do Firefox Relay and Krystal work with my own domain?
Only Krystal does (Yes). With Firefox Relay your address stays on its own domain.
Where do Firefox Relay and Krystal keep my email?
Firefox Relay keeps it in the United States. Krystal keeps it in the United Kingdom.
Do Firefox Relay and Krystal work in other mail apps?
Firefox Relay only works in its own apps. Krystal works in any mail app over IMAP.
Prices and the latest news
No price changes for either since 25 October 2026. I check regularly and add any change here with its date.
The latest headlines: Firefox Relay news · Krystal news.
Not sold on either? Try these
Firefox Relay vs mailbox.org · Krystal vs mailbox.org · Firefox Relay vs Posteo · Krystal vs Posteo · Firefox Relay vs Proton Mail · Krystal vs Proton Mail
Moving your email
Whichever you choose, the move follows the same steps. Pick your two providers for the steps.