Criptext is a native Mac email client that applies the Signal Protocol — the same cryptographic standard that powers Signal Messenger — to your inbox, storing every message locally on your device rather than on any remote server.
What is Criptext?
Criptext is an encrypted email app for macOS that takes a fundamentally different architectural stance from the services most people use. Where ProtonMail or iCloud Mail keep ciphertext (or worse, plaintext) in a data centre, Criptext treats the server as a relay, not a vault. Encrypted payloads pass through and nothing lingers. The company literally cannot read your mail — not because of a policy, but because the keys never leave your machine. That is a structural guarantee, not a promise on a marketing page.
Accounts live at @criptext.com rather than plugging into an existing Gmail or iCloud address, which is worth knowing upfront. Think of it as a dedicated private channel rather than a drop-in replacement for your existing client.
What does Criptext do best?
The standout combination is local-first storage and message recall. Because your inbox sits on your Mac rather than a centralised server, there is no honeypot of messages waiting to be breached in a provider-side incident. Recall goes one step further: you can revoke a sent message even after the recipient has downloaded it by invalidating the decryption key. I have used this when a draft accidentally went out five seconds early — watching the revoked message disappear on the other end is oddly satisfying.
Read receipts are handled with equal care. Delivery and open confirmations flow directly between sender and recipient rather than being vacuumed up into a provider's analytics pipeline. That is a small thing, but it reflects the consistent philosophy the app applies everywhere: metadata is data too.
Is Criptext free?
Criptext is free to download and free to use for personal accounts, with no advertising and no data-monetisation trade-off funding the free tier. A premium offering exists for teams and organisations who need shared inboxes or administrative controls, but an individual user can get full end-to-end encryption, unlimited messaging, and message recall without paying anything. For a security-first product that represents a genuine alternative to big-tech email, that pricing stance is unusually generous.
Who should use Criptext?
Journalists protecting sources, lawyers sharing case material, freelancers sending sensitive contracts, and anyone who simply objects to their inbox being mined for behavioural signals will find the zero-knowledge model immediately compelling. The full Signal Protocol guarantee applies to Criptext-to-Criptext exchanges — when you email someone on a standard provider, the message still travels over TLS but without device-to-device encryption. That is a meaningful caveat, not a dealbreaker: the most sensitive threads in most people's lives involve a handful of contacts, and nudging those contacts to create a free Criptext account is a reasonable ask.
Power users comfortable managing their own backups will feel at home. Users who expect cloud sync across five devices with no local setup will find the model unfamiliar and should probably start with ProtonMail instead.
How does Criptext compare to ProtonMail and Tutanota?
ProtonMail is the benchmark for mainstream privacy email: Swiss jurisdiction, polished web app, and a mature ecosystem spanning VPN, Drive, and Calendar. Its encryption keeps the provider from reading your content, but ciphertext does live on Proton's servers — a distinction that matters if your threat model includes state-level compelled disclosure. Tutanota is the strong European alternative, with a cleaner interface and a generous free tier, though like Proton it retains encrypted data server-side.
Criptext's architectural edge is the local-first model: nothing stored remotely means nothing to hand over. The trade-off is that Proton and Tutanota both offer excellent browser clients and built-in cloud backup; Criptext's offline-first approach puts the backup burden on you. For most users who want a capable, trustworthy private email app, ProtonMail is the more polished daily driver. For users who want the strongest possible structural privacy guarantee and are willing to manage their own backups, Criptext makes a genuinely compelling case that the others cannot match.
