scrt.link vs IncaMail
IncaMail is Swiss Post's service for legally-valid, registered email delivery. scrt.link is zero-knowledge secret sharing — a different tool for a different job.
IncaMail is Swiss Post's secure email service. Its purpose is compliant, verifiable, registered email delivery — payslips, tax notices, insurance documents, and legally-valid correspondence for Swiss court, debt-collection and administrative proceedings. It is ISO/IEC 27001-certified and recognised by the Swiss Federal Department of Justice and Police as a secure delivery platform.
It is genuinely good at that job, and it is not really the same kind of tool as scrt.link. The two overlap only on "send something confidential to someone" — beyond that they diverge.
The core difference is the trust model. IncaMail is platform encryption operated by a trusted party: messages travel over TLS, are encrypted at rest, and Swiss Post runs the platform that decrypts and delivers them through a portal. scrt.link is zero-knowledge: the secret is encrypted in your browser and the key lives in the URL fragment, so our server never holds it. Neither is "more secure" in the abstract — they answer different questions. IncaMail answers "can I prove I legally delivered this?"; scrt.link answers "can I share this so that not even the provider can read it?"
Feature comparison
| Feature | scrt.link | IncaMail |
|---|---|---|
Zero-knowledge / end-to-end encrypted | ||
Provider can technically access content | No | Yes (trusted operator) |
Encryption model | Client-side (key in URL fragment) | Platform (TLS + encrypted at rest) |
Legally-valid registered delivery | Yes (Swiss FDJP / SR 272.11) | |
Signed proof-of-delivery receipt | Yes (digitally signed PDF) | |
Read receipts | Yes (paid plans) | Yes (legally signed) |
Self-destructing / one-time links | ||
Recipient needs no account | Opens via password or key link | |
File sharing | Up to 100 GB | Up to 1 GB, 7-day link |
Text secrets (passwords, keys, notes) | Email messages | |
Sends from Outlook / Office 365 / SAP | ||
Bulk sending from business software | Yes (payslips, tax notices) | |
ISO/IEC 27001 certified | ||
Open source | Yes (MIT) | |
Self-hostable | ||
Pricing | Free + paid plans | Free tier; Premium CHF 99/yr; Business on request |
Facts about IncaMail last verified on July 18, 2026. Products change — if something here is out of date, let us know and we'll fix it.
Key differences
Two different jobs, not two versions of one
IncaMail exists to deliver email that is compliant and provable — a signed receipt, an audit trail, recognition under Swiss law. scrt.link exists to share a secret that then disappears, with the least possible trace. If you need to send a payslip to 5,000 employees from your HR system, IncaMail is built for that and scrt.link is not. If you need to hand a contractor a database password that self-destructs after one view, scrt.link is built for that and IncaMail is not.
Trusted operator versus zero-knowledge
IncaMail's encryption is real and its ISO 27001 certification is real — but it is platform encryption: Swiss Post runs the service, holds the keys, and decrypts messages to deliver them through its portal. You are trusting Swiss Post, which for a Swiss institution is often exactly the right thing to do. scrt.link removes that trust requirement entirely: the key is generated in your browser and never sent to us, so there is nothing on our side to read, subpoena, or leak.
Proof of delivery versus no paper trail
IncaMail's flagship feature is the legally-signed delivery receipt — evidence that a message was sent, and accepted, refused or expired. scrt.link is the opposite by design: no account needed, the link burns after reading, and we keep as little as possible. One is built to create a record; the other is built to avoid one.
What the recipient has to do
To read an IncaMail message the recipient engages the platform — a "Read" button, then an IncaMail password or a key link (historically an app was required on iPhone). With scrt.link the recipient just opens a link and the secret decrypts in their browser. For internal, compliant correspondence the portal step is acceptable; for a quick one-off share it is friction.
Which one should you use?
Choose scrt.link if…
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You want the provider to be structurally unable to read the content, not a trusted operator that can.
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You are sharing ad-hoc secrets — a password, an API key, a file — not sending compliant business mail.
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Your recipient shouldn't need an account, app, or portal login — just a link.
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You want it free, open source, self-hostable, and able to send files up to 100 GB.
Choose IncaMail if…
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You need legally-valid registered email with a signed proof of delivery for Swiss court, debt-collection or administrative proceedings.
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You send confidential documents in bulk from business software — payslips, tax notices, insurance statements.
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Swiss Post as a named, ISO 27001-certified operator with Swiss data residency is a compliance requirement.
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You want encryption built into everyday email in Outlook, Office 365 or SAP, not a separate link.
Frequently asked questions
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