Your privacy tool is owned by the Swiss government's postal service. Good privacy laws, but government-owned privacy company is worth knowing. You can't check Tresorit's code -- trust their auditors. Proton publishes all code. Both zero-knowledge, but Proton is more transparent.
What they claim: Tresorit is an independent privacy company.
What we found: Owned by Swiss Post (Swiss government entity) since 2021. Government ownership of privacy tool creates structural tension.
What they claim: Tresorit's encryption is verifiable and trustworthy.
What we found: Not open source. Relies on Ernst & Young audits. Point-in-time snapshots. Proton Drive code is fully public. Users must trust auditors, not verify themselves.
What they claim: Tresorit is accessible private cloud storage.
What we found: No free tier ($10.42/month). Enterprise pricing. Proton Drive: free zero-knowledge storage. Web access limited.