Your archive. Your assistant. Verifiable by anyone.
Meridian is a unified AI workspace for people who need to trust their own archive. Chat with every document you've ever kept, run deep research across your whole corpus, and ship answers that anyone can verify without trusting us.
How Meridian works.
What's inside Meridian.
One workspace. Six capabilities. Every one of them emits and consumes Canon attestations, so no matter how you use Meridian, the result is checkable evidence — not opaque output.
How Meridian compares.
Feature-by-feature against the tools you already know. We mark 'no' where we don't have a feature — honest accounting is the mandate.
| Feature | Meridian | ChatGPT Plus | Notion AI | Glean | Westlaw |
|---|---|---|---|---|---|
Per-user database isolation Each user gets a dedicated Postgres instance | Yes | No | No | No | Partial |
Canon attestation on every answer Ed25519-signed, falsifiable artifact | Yes | No | No | No | No |
Append-only custody chain Merkle-linked audit trail for every operation | Yes | No | No | No | No |
Inline citations to source documents Click-through to the specific paragraph | Yes | Partial | No | Yes | Yes |
Deep research mode Multi-step investigation with cross-checking | Yes | Yes | No | No | Partial |
Sensitivity-tiered model routing Local / sensitive / public routing per document | Yes | No | No | No | No |
Personal data archive Ingest email, PDFs, recordings, exports | Yes | No | Partial | Yes | No |
Knowledge base / workspace Structured knowledge management | Partial | No | Yes | Yes | Yes |
Real-time collaboration Multi-user editing and commenting | No | No | Yes | Partial | No |
Code generation Write and execute code inline | No | Yes | No | No | No |
Open verification standard Anyone can verify without vendor cooperation | Yes | No | No | No | No |
Legal-hold gating Document-level preservation controls | Yes | No | No | No | Yes |
Evidence-grade output, for everyone.
Most AI tools ship you a plausible paragraph. Meridian ships you a verifiable artifact. Every answer is a signed JSON attestation — a record of what was seen, what was concluded, what was challenged, and what was deliberately not examined.
What ships with every answer
- ▸A witness list — the retrieved documents, with content hashes
- ▸Typed claims — each with an inference type and supports
- ▸Applied challenges — what was cross-checked, what failed, what was declined
- ▸A cryptographic seal — Ed25519 signature over the canonical serialization
What anyone can do with it
- ▸Verify the signature — independently of Meridian or NORA
- ▸Re-hash every witness and confirm the retrieval was honest
- ▸Walk every claim back to its supports — no circular references, no orphan assertions
- ▸Review exactly what was not examined, and decide whether the scope is acceptable
This is the Canon standard. It's an open specification published by NORA Foundation under CC0 — Meridian is the reference implementation, but anyone can write a verifier, and anyone can build a conforming issuer. Read the Canon specification.
Technical specifications.
One pipeline. Four tiers.
Witness is free forever. The paid tiers unlock personal archives, forensic features, and institutional isolation. Pricing reinforces posture — every tier enforces the mandate.
Anyone curious about verifiable AI
- Sample archive · read-only
- Fast-tier model only
- 50 sealed attestations / mo
- Public /verify playground
- Community support
Individual knowledge work
- 50 GB personal archive
- All model tiers · $15 inf cap
- All router profiles (incl. local)
- Unlimited observation seals
- Email support · 2 business days
- Full data export
Lawyers · journalists · researchers
- 200 GB · $60 inf cap (tunable)
- Deep-research · BriefAttestation
- Legal-hold gating · priority ingest
- Per-archive signing key
- Cross-encoder rerank
- Priority support · 1 business day
Firms · newsrooms · compliance teams
- Per-user Postgres isolation
- SSO / SAML · BAA / DPA
- Audit-export as deposition exhibit
- On-prem option · dedicated bridge
- Custom domain packs
- Dedicated support · SLA
Nonprofit & academic pricing · 50% off · Pro-bono attorneys free for 12 months on verification
Common questions.
A workspace built for the work that matters.
If your conclusions have to hold up under scrutiny, you need a tool that holds up under scrutiny. Meridian is that tool.