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It's a split decision.
Choose Fastmail if you need hosted email, calendar and contacts: its plans start at €3 per user/month with annual billing (Basic business), and it offers a 30-day trial. Choose Proton.ai if you want to buy, rent or lease-to-own premium domains; it is a domain marketplace, not an AI sales tool, and its pricing page does not publish a starting price. These are different products, not direct substitutes.
01Side by side
| Fastmail | Proton.ai | |
|---|---|---|
| Starting price | €3/month per user, annual billing (Basic business) | No starting price published; custom quote |
| Free plan | No | No |
| Best for | Individuals, families, and businesses needing hosted email | Buyers seeking premium domains or digital real estate |
| Core strength | Email, calendar, contacts, and masked email | Premium-domain buying, renting, and leasing |
| Learning curve | Not published | Not published |
| Integrations/data | Data access without lock-in; integrations not listed | Domain marketplace; integrations not published |
| Team/seat costs | €3–9/user/month annual; €4–10 monthly | Custom quote; seat pricing not published |
| Support | Personal support emphasized; details not published | Support details not published |
Fastmail Choose Fastmail if
- You need hosted email, calendar, and contacts.
- You want published business plans priced per user.
- You value access to your data without lock-in.
Proton.ai Choose Proton.ai if
- You want to buy, rent, or lease-to-own premium domains.
- You need domain search and marketplace browsing.
- You’re considering a custom deal for select digital assets.
02Pricing compared
Fastmail’s lowest listed price is €3 per user/month for its Basic business plan with 12-month billing; monthly billing is €4. That plan includes 6 GB total storage per user, with 5 GB for mail, calendar and contacts. For individuals, the Individual plan is €5/month annually or €6 monthly, with 60 GB total storage. Fastmail offers a trial of up to 30 days. The pricing page also lists 24- and 36-month billing options.
Proton.ai does not publish a starting price or monthly or annual rates. Its pricing information describes custom quotes, with no plan inclusions listed. The pricing data has low confidence, so confirm terms directly before committing. These prices are not a like-for-like comparison: Fastmail charges for hosted email, while Proton.ai offers premium domains and digital real estate.
03Features and depth
Fastmail bundles email, calendar and contacts. Its listed tools include message search, pinned messages, offline access, scheduled sending, VIP-only notifications, Masked Email and aliases. Users can add private notes to messages, including reminders and payment dates. Calendar features include managing events and seeing changes when someone updates an event. Storage and business features vary by plan: Basic lists 6 GB total storage per user, while Professional lists 150 GB and an email retention archive.
Proton.ai’s described product is a marketplace for premium domains and digital real estate, not an AI sales tool. Buyers can browse and search domains, including a featured Crown Jewels collection, and sort results alphabetically or by shortest first. Select assets may be available to buy, rent, lease-to-own, license or discuss under other arrangements. Its calculators estimate lease-to-own payments or rental costs; purchase rights depend on the agreement. Fastmail manages communications and calendars. Proton.ai facilitates domain transactions. Neither product’s listed features make it a substitute for the other.
04Ease of use and learning curve
The published product information does not establish which service is easier to learn. Fastmail’s listed functions center on everyday email, calendar and contact tasks, with offline access for managing those items. Businesses should check storage and address requirements before choosing a plan; custom business addresses with a domain are listed on Standard, not Basic.
Proton.ai’s workflow is different: search for a domain, review an asset’s available transaction options, and use a calculator for rent or lease-to-own estimates. The pricing information does not list standard rates, and specific purchase terms may depend on the asset or agreement. If you need an inbox, choose based on email needs; if you want domain assets, evaluate the marketplace.
Questions people ask
Why should I use Proton Mail instead of Gmail?
This comparison is about Proton.ai, which the published product information describes as a premium-domain marketplace—not Proton Mail. It does not provide evidence to compare Proton Mail with Gmail. If you are choosing an email provider, compare those services’ current features, prices and privacy terms directly.
Is there a problem with Fastmail?
The published information does not report a specific problem with Fastmail. It is a paid email service, and plan limits matter: for example, its Basic business plan lists 6 GB total storage per user. Check the storage and domain features you need before switching.
What is the most hacked email service?
The published sources do not provide breach rates or a ranking of email services by hacking incidents, so we can’t identify the most hacked service. For a provider decision, compare documented security features and account protections in each service’s current documentation rather than relying on an unsupported ranking.
Does Proton use AI?
The Proton.ai homepage information published here describes a marketplace for premium domains and digital real estate, not an AI sales tool. It does not establish whether Proton.ai uses AI behind the scenes, or whether a separate product called Proton uses AI. Check the relevant product’s documentation for that.