The iPhone's built-in Mail app is solid but far from the best choice for everyone. This comparison covers apps that add end-to-end encryption, smart sorting or real productivity features, and the differences are fundamental.
The iPhone's built-in Mail app is solid but far from the best choice for everyone. This comparison covers apps that add end-to-end encryption, smart sorting or real productivity features, and the differences are fundamental. Proton Mail and Tuta stand for secure email: end-to-end encrypted, hosted in Europe and GDPR-compliant. Spark is a productivity tool with AI-assisted writing and team features. HEY Email rethinks email entirely, replacing the classic inbox with Imbox, Feed and Paper Trail. As of March 2026, HEY remains a niche product and Tuta is confirmed as the strongest German-language encryption alternative. Decisions turn on end-to-end encryption for sent messages, support for multiple email providers, intelligent inbox sorting and snooze, whether message content is used for advertising or model training, and whether a subscription is required. The publisher says it used the relevant apps for weeks as its primary mail clients rather than setting them up briefly.
Our verdict
Proton Mail is the clear recommendation for anyone serious about secure email: end-to-end encryption, Swiss privacy and an integrated calendar make a coherent package. Anyone already using Gmail or Outlook who wants to work more productively should choose Spark, whose AI features and smart inbox save real time day to day.
Tuta is the German alternative to Proton: open source, encrypted and cheaper. HEY Email is not for everyone, but anyone who likes its approach reportedly never wants to go back to a classic inbox.
The practical advice is to start private, secure communication with the free Proton plan, and to try Spark for more productive work with an existing email account; the free version is enough to decide.
Proton Mail is the leading encrypted email provider, based in Switzerland: end-to-end encryption, no tracking and open-source clients, with a free plan offering 1 GB of storage. It belongs to the Proton ecosystem alongside VPN, Drive and Calendar, so mail, files and scheduling sit under the same privacy model.
The base app is free and open source; a Plus subscription at around €4 per month adds a custom domain and additional mailboxes, with source code on GitHub. The source calls it the best choice when privacy is the priority; outside the paid Bridge it works only with a Proton address.
Spark is a smart email client aimed at heavy inboxes and teams: automatic prioritization, shared inboxes, AI-assisted writing and snooze organize the day for people who receive a lot of mail. It works with Gmail and Outlook rather than replacing the provider, and the base is free.
Premium costs around €8 per month for AI replies, shared inboxes and snooze. The source calls it the best productivity option for Gmail and Outlook users; it is less suited to anyone who refuses external servers, dislikes AI features or will not pay a subscription.
Tuta is the German encrypted provider in the comparison and, as of March 2026, the publisher's confirmed best German-language alternative for encrypted email: end-to-end encryption, open-source clients and GDPR compliance, with a free base tier. The source calls it cheaper than Proton.
Premium costs around €4 per month for a custom domain and more mailboxes, and the source code is published on GitHub. It works only with its own service rather than IMAP, and the free tier matches Proton's 1 GB.
HEY is 37signals' radical redesign of email, replacing the single inbox with three areas: Imbox for important mail, The Feed for newsletters and updates, and Paper Trail for receipts and confirmations. New senders must be approved, which removes spam at the source; the cost is a complete change of habits and a new address.
There is no ad-funded free version — the service runs on a subscription at around €12 per month with its own email account. The source treats it as a niche product for converts, not a mainstream recommendation.
Edison is a fast client that gathers all your mail accounts in one clear app, free of charge, with quick blocking of unwanted senders and subscription mail. Its commercial model is unusual: the company monetizes aggregated, anonymized analysis of commercial emails such as receipts, package notices and travel bookings, while personal mail is reportedly not processed.
The source flags exactly that trade-off for anyone who wants full data privacy, and notes smart features are limited outside the USA and UK. Its strength is speed and multi-account consolidation rather than encryption.
Airmail 5 is a powerful email client with deep Shortcuts integration, aimed at professionals who automate workflows with rules and actions and manage several accounts in one place, wrapped in an award-nominated interface.
It runs on a subscription of around €3 per month or €20 per year with no restricted free tier. The source points to its 3.9 rating as a sign that price and value do not line up for everyone, and it is a poor fit for occasional users who want stability without update problems.
Microsoft Outlook combines email and calendar in one app and integrates natively with Microsoft 365, which makes it the obvious install for Office users who want mail, scheduling and files together on the iPhone. It is free and financed through Microsoft 365, with no separate payment required.
Outside an existing Microsoft setup the source considers it overkill for private use, and the full feature set assumes a subscription; the clean, uncluttered interface remains a draw on its own.
Gmail is Google's app for Gmail users: reliable spam filtering, 15 GB of free storage shared with the Google account, and seamless Google Workspace management on the iPhone. It is free and has no premium tier, funded through Google's advertising network.
The source notes the parent company's data practices as the trade-off, since Google services analyze email for advertising; anyone wanting a privacy-first alternative should look at Proton or Tuta rather than here.
Apple Mail is the preinstalled, free option and integrates fully with iOS, with no subscription or in-app purchases. Privacy Protection blocks invisible tracking pixels, and it gathers all your accounts in one place without extra cost.
The source considers it sufficient for simple use but lacking the deeper workflows of Spark or Airmail: scheduled sending, undo send, snooze and advanced automation are not part of the package. If you need no extras, there is little reason to switch.
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Questions & answers
Which mail app for the iPhone is the most secure?
Proton Mail offers the strongest encryption: end-to-end between Proton users and zero-access encryption for all other mail. Its servers are based in Switzerland, outside EU and US jurisdiction. Tuta, from Germany, offers comparable security and is fully verifiable as an open-source project.
Can I use Gmail inside another mail app?
Yes. Spark, Edison and Airmail support Gmail, Outlook, Yahoo and other IMAP accounts. Proton Mail and Tuta work only with their own mail services, so you either create a new account or use the paid Bridge feature with existing clients.
Is Proton Mail really free?
Yes. The free plan includes 1 GB of storage and one Proton address, enough for normal private use. Anyone wanting custom domains, more storage, or the integrated calendar and VPN needs one of the paid plans, which start at €3.99 per month.
What makes HEY Email different from other mail apps?
HEY replaces the classic inbox with three areas: Imbox for important mail only, The Feed for newsletters and updates, and Paper Trail for receipts and confirmations. New senders have to be approved first, which removes spam but demands a change of habits. There is no free plan.
Is switching from Apple Mail worth it?
If you are happy with Apple Mail and do not need encryption, stay where you are. Switching pays off if you want smart sorting with Spark, maximum security through Proton or Tuta, or a radically different approach with HEY. Apple's standard app has closed the gap considerably in recent years.
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