Enterprise-grade contract review, legal research, and compliance analysis — with zero data retention, zero knowledge architecture, and cryptographic proof of deletion.
ABA Model Rule 1.6(c) demands attorneys prevent unauthorized disclosure of client data. ABA Formal Opinion 512 requires vetting AI vendor safeguards. Yet every major legal AI tool demands you upload privileged documents to their cloud.
“The difference between a hotel safe and a bank vault. Competitors offer a DPA. We offer cryptographic attestation certificates proving data destruction — auditable, non-repudiable evidence for ethics compliance.”
Every feature runs on ephemeral zero-knowledge compute. Your data exists only in-memory, only during processing, and is cryptographically destroyed upon completion.
Our servers are a blind relay. They route encrypted payloads between your browser and Claude's API but never hold decryption keys. Even a complete server compromise yields zero usable client data.
Document enters your browser. Encrypted immediately via AES-256-GCM using client-generated keys.
Encrypted payload sent to an ephemeral container. Per-session isolation — no persistent storage.
Decrypted in-memory only. Claude API processes with Zero Data Retention mode active. Response re-encrypted.
Container destroyed. SHA-256 session hash generated. Destruction Attestation Certificate issued to you.
This is what happens behind the scenes every time you analyze a contract. From client-side encryption to destruction attestation — completed in under 4 seconds.
$ barzero analyze --file nda_acme_corp.pdf --position receiving-party
[10:04:15.001] Initializing AES-256-GCM client-side encryption...
[10:04:15.042] Encrypting payload (1.2MB)... Done.
[10:04:15.089] Generating ephemeral session key pair...
[10:04:16.102] Sending encrypted payload to vm-fly-x89d...
[10:04:16.340] ✓ Request signed via WebAuthn FIDO2
[10:04:16.512] ✓ Ephemeral container [vm-fly-x89d] active
[10:04:17.001] ✓ Claude Sonnet 4.6 initialized (ZDR mode)
[10:04:17.890] ✓ CUAD 41-category risk scan executing...
[10:04:18.204] ✓ Position-aware analysis (receiving party)
[10:04:18.501] ✓ Response encrypted, returning to client
[10:04:18.720] Wiping memory space for [vm-fly-x89d]...
[10:04:18.901] DESTRUCTION ATTESTATION CERTIFICATE ISSUED
[10:04:18.902] SHA-256: a3f8c2...9e1b04
✓ Complete · Risk: Medium · 2 red flags · 3 critical clauses · 1 missing provision
Every layer assumes breach. Seven isolated layers between your document and the outside world.
Everyone claims “secure AI.” We prove it architecturally.
| Platform | Price/Seat/Mo | Min Seats | Zero Trust | Zero Knowledge | Zero Retention |
|---|---|---|---|---|---|
| BarZero | $79 — $299 | 1 | ✓ Full | ✓ E2E Encrypted | ✓ Attested |
| Harvey AI | $1,000 — $1,200+ | 25-50 | ⚠ Enterprise SSO | ✕ Server-side | ⚠ Contractual |
| CoCounsel | $225 — $428 | 1 | ⚠ Basic | ✕ TR Infrastructure | ⚠ Policy-based |
| Spellbook | $49 — $300 | 1 | ⚠ Basic | ✕ Cloud-processed | ✓ Contractual |
| Lexis+ AI | Custom | 1 | ⚠ SSO | ✕ LN servers | ⚠ Policy-based |
| GC AI | $416 — $583 | 1 | ⚠ Basic | ✕ Cloud-processed | ⚠ Contractual |
Harvey charges $288K+/year minimum. A solo practitioner on BarZero pays $948/year for comparable intelligence. That's a 300× cost reduction.
Usage-based sessions, not confusing token limits. Every plan includes zero-knowledge architecture and destruction attestation.
All plans include zero retention architecture and destruction attestation certificates. Overage: $2/session. 14-day free trial, no credit card required.
Join the firms that refuse to compromise between AI power and client privilege. Start reviewing contracts in under 2 minutes.
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