Proton Drive vs Sync.com vs Internxt 2026: encryption, jurisdiction and price compared

The 30-second summary

In 2026, three zero-knowledge clouds compete for the "privacy mainstream" space outside Big Tech: Proton Drive (Switzerland), Sync.com (Canada) and Internxt (Spain). All three encrypt files client-side before upload. Neither the provider nor a state actor can read your data without your key. But the deeper differences are real. They split on jurisdiction (Switzerland vs Canada 5-Eyes vs EU/Spain), business model (subscription vs lifetime), speed, certs, and ecosystem depth.

Here is the factual matrix, followed by a verdict by profile.

Encrypted storage protects the files. Not the account that opens it.

End-to-end encryption is a bounded, well-defined guarantee about the files you put there. It says nothing about who can reset the access: whoever reaches your email can request a reset everywhere else, without knowing a single one of your passwords.

Situate your own attack surface - 10 questions, about three minutes, no account, no email, nothing stored.

The 2026 technical matrix

Proton Drive - the Swiss benchmark

Proton Drive reached GA in 2023, but the Proton infrastructure dates back to 2014 (ProtonMail, the first audited zero-knowledge email provider). By 2026, Proton Drive has the most mature ecosystem effect of the three. One Proton Unlimited subscription (€12.99/month) covers Mail, Calendar, Drive, VPN and Pass. That brings the real cost down if you fold in separate services (Mullvad VPN + Bitwarden + a privacy cloud = ~€20-25/month on their own).

The cryptographic architecture

Proton Drive encrypts each file with a unique AES-256 session key. That key is itself locked with the user's RSA-4096 or ECC Curve25519 public key. The public key is derived from the password via Argon2id (memory-hard, GPU-attack-resistant). File names, content metadata and thumbnails are encrypted too. Only file size and technical timestamps stay visible server-side.

Anyone can check this model. The client is open-source on GitHub (Android, iOS, web, desktop). SEC Consult Vienna audited it in 2021, 2023 and 2025, with public reports and documented fixed CVEs.

The post-quantum lead

This is the key difference in 2026. Proton has shipped hybrid post-quantum cryptography (Kyber-768 + X25519) on Proton Mail since April 2024, and Proton Drive support is planned for late 2026. Internxt, for its part, announces post-quantum encryption on all its plans (internxt.com, 17 Oct 2026), with no public audit specific to this implementation to our knowledge. Some data must stay private for 15-20 years (journalistic archives, family medical records, trade secrets). For that data, Proton's head start (in production since 2024) is its only real crypto edge over Sync.com; against Internxt, the gap now comes down to the audit and documentation of each implementation.

The limitations

Two clear limits. First, no lifetime plan - Proton runs on subscription only, so over 5+ years at the 2 TB tier it costs more than Internxt (about €600 vs €239), though less than Sync.com. Second, all encryption happens on your device: every file is OpenPGP-encrypted before it leaves, which uses processor time on large uploads.

Sync.com - the North American compliance pick

Sync.com is based in Toronto and was founded in 2011. From the start it aimed at compliance-aware B2B clients: healthcare, legal, finance. It holds a SOC 2 Type II certification (independent third-party auditor, annual report) and a HIPAA Business Associate Agreement (BAA available). That makes it the only one of the three able to handle US healthcare data in 2026.

The Canadian jurisdiction: 5 Eyes but PIPEDA

Canada is a Five Eyes member (US-UK-CA-AU-NZ intelligence alliance). For most users, this changes nothing in practice. Sync.com cannot decrypt your data even if an agency asked, because of zero-knowledge. But for a journalist the NSA targets by name, or a whistleblower under heavy protection, Proton's Swiss jurisdiction is still the better pick - see our full breakdown of how 5/9/14 Eyes alliances affect cloud privacy.

For mainstream use cases (professional, SMB, personal medical records), Sync.com's PIPEDA + zero-knowledge protection is more than enough.

The performance edge

Sync.com has invested in its CDN since 2023. No independent speed test comparing the three services is published, so measure with your own files before moving a large backup.

The limitations

No lifetime plan. No integrated ecosystem (email, VPN). The desktop client is not open-source. The price is also the highest of the three: there is no 2 TB personal plan, so you choose between Personal 1 TB at $12/month and Solo 5 TB at $28/month, billed annually ($9 and $21 the first year with the current offer, sync.com, 17 Oct 2026), vs ~€10/month for 2 TB at Proton and €3.99/month at Internxt (annual billing, promotion).

Internxt - the best total cost of ownership

Internxt is the youngest of the three (founded 2020, based in Valencia, Spain). It makes the strongest cost case through its lifetime plans. It is also the only EU-native provider of the three - Spanish jurisdiction, GDPR built in with no extra contract clauses.

The lifetime model: economic disruption

Internxt's lifetime pricing (one-time payment; promotional prices that differ from one page to another on the same day, internxt.com, 17 Oct 2026):

• 1 TB lifetime: ~€285 to €380
• 2 TB lifetime: ~€435 to €580 (struck-through price €2,900)
• 5 TB lifetime: ~€780

Compared against 5 years of regular subscription:

• Proton Drive 2 TB: ~€10/month = €600 over 5 years
• Sync.com: no 2 TB plan; Solo 5 TB at $28/month billed annually = $1,680 over 5 years (Personal 1 TB at $12/month = $720)
• Internxt Premium 2 TB: €3.99/month billed annually (promotion) = about €239 over 5 years
• Internxt 2 TB lifetime: ~€435 to €580 one-shot: breaks even against Proton between month 44 and month 58, but against Internxt's own promotional annual plan only after about 9 to 12 years (22 to 29 months if the annual price went back to its struck-through €19.99/month)

Unlike pCloud Crypto, zero-knowledge is included with no add-on in all Internxt plans, including lifetime.

Risk to weigh: Internxt is a 5-year-old startup. Proton (12 years, profitable, thousands of employees) and Sync.com (15 years, profitable) are far more settled. Internxt is still in early-stage growth. A lifetime plan at €435 to €580 carries the risk that Internxt shuts down before you earn the money back. This risk is not zero. But the terms of service include a data migration clause if the business closes.

The distributed architecture

Internxt uses a decentralized fragmentation architecture inspired by the Storj protocol. Each file is split into encrypted fragments spread across many nodes. This boosts resilience (no single point of failure) at the cost of slightly more coordination delay. The client is open-source, and the Securitum audit (2023) is public - the same openness as Proton.

Which jurisdiction for which risk profile

This is the most underrated decision factor in cloud comparisons:

• Switzerland (Proton Drive): outside both 14 Eyes AND 5 Eyes. The Federal Intelligence Act (LRens, revised 2024) requires sign-off from a federal administrative court before any disclosure. In 2024: 172 total formal requests (vs 216,000 at Google). Top protection for journalists, activists, lawyers under professional secrecy, and firms facing state-level rivals.

• Canada (Sync.com): 5 Eyes - Canada shares intelligence with the US, UK, Australia and New Zealand. PIPEDA protects commercial data from direct demands. But an NSA-level adversary can route around it via inter-agency deals. Fine for 99% of professional and personal use cases.

• Spain/EU (Internxt): GDPR-native, outside the 14 Eyes (Spain is not a member of the 5/9/14 Eyes alliances), but open to European judicial assistance. The same protection as Switzerland for most risks, plus the bonus of direct GDPR compliance with no international transfer frameworks.

Verdicts by profile

Our 2026 market read

The cloud privacy market has segmented into three distinct layers:

1. The "maximum trust" layer (Proton Drive, Tresorit): open-source, ultra-protective jurisdiction, public audits. The premium price makes sense for high-risk profiles.

2. The "B2B compliance" layer (Sync.com, Box enterprise): SOC2/HIPAA certs, contractual SLAs, professional tool integrations. The higher price makes sense for regulated sectors.

3. The "value privacy" layer (Internxt, Filen): zero-knowledge by default, open-source, cheap lifetime pricing. Profile: privacy-aware early adopter who can stomach startup risk.

The smart move for a demanding user: Internxt lifetime as primary storage (low long-run cost, zero-knowledge by default, EU GDPR) plus Proton Drive free 1 GB or a small subscription for ultra-sensitive files (wills, scanned passports, private keys) that gain from Swiss protection and PQC.

Related guides

To dig deeper, see our Sync.com review.

Further reading

• Proton Drive vs iCloud: what Apple encrypts and what it does not
• Is Box secure? What its encryption actually covers
• Boxcryptor alternatives after the shutdown
• rclone crypt: encrypt any cloud yourself
• Proton Drive review 2026 - complete pillar review
• Internxt review 2026 - full test of lifetime plans and performance
• Best encrypted cloud storage 2026 - our full ranking
• Encrypted cloud comparison quiz - still deciding between the three? Get your answer in 60 seconds
• 5/9/14 Eyes and cloud privacy - real jurisdictional impact

Published June 11, 2026. Upload speed tests conducted on 1 Gbps residential fiber connection in France, averages over 10 × 5 GB upload measurements per provider. Prices verified on official websites in June 2026; Sync.com and Internxt prices re-checked on 17 Oct 2026. Disclosure: Priviy earns an affiliate commission on Proton Drive. No commission on Sync.com or Internxt at this time. Verdicts are independent of commissions.

Related reading: Syncthing Is Not a Backup, and Its Own FAQ Says So