A local-first workspace for transactional lawyers

Legal AI you can cross‑examine.

NyayVaani reads your documents where they live — on your machine — and answers with citations that click through to the exact clause. If a sentence can’t show its source, it doesn’t pass.

  • Documents never leave your machine
  • Bring your own model key
  • Windows · macOS · Linux
Matter — Project Meridian · SPA review 12 documents · indexed locally
Q.

Can Meridian assign the SPA to its new parent without our consent?

No — assignment requires prior written consent. Clause 14.2 of the SPA prohibits either party from assigning rights or obligations without the other party’s prior written consent1. The Disclosure Letter carves out one exception — assignment to a wholly-owned subsidiary — which does not extend to a parent entity2. Consent would therefore be required before any assignment upward in the group.

Share Purchase Agreement.pdf cl. 14.2
“Neither party may assign, transfer or otherwise deal with any of its rights or obligations under this Agreement without the prior written consent of the other party.”
Disclosure Letter.pdf ¶ 8
“Clause 14.2 shall not restrict an assignment by the Purchaser to a wholly-owned subsidiary of the Purchaser.”
Every sentence is answerable — a citation opens the source span Unanchored claims are flagged, not dressed up
¶ 1 Privacy by architecture

Nothing leaves the building.

Your matter files are read, indexed, and searched on your own machine. There is no document store to breach, because the store is your disk. The only thing that crosses the wire is the request you approve — sent directly to the model provider you chose, under your own key.

Your documents
stay on your disk. NyayVaani builds its index locally and keeps it there. Nothing is uploaded, mirrored, or retained by us — we couldn’t hand your data room to anyone, because we never have it.
Your key
connects the app straight to Gemini, Claude, or OpenAI — no intermediary reading your prompts. Prefer one bill? An included plan is available, and the connection stays direct either way.
Your machine
runs a native desktop app, not a browser tab in a costume. It opens fast, searches without a spinner, and works offline until the moment you ask a model something.
¶ 2 Verifiability

Cited to the paragraph, not to the vibe.

Every sentence NyayVaani drafts carries a pin to its source — document, clause, paragraph. Click it and the span is in front of you, highlighted, ready to be judged. Anchors point at paragraphs and clauses rather than page numbers, so they survive reformatting and hold up inside a marked-up draft. And when an answer can’t be anchored, it says so — flagged as unsourced, never dressed up as fact.

¶ 3 Review at scale

Five hundred documents. One table. Every cell shows its work.

Define the columns once — parties, term, change of control, governing law — and run them across the whole data room in parallel. Each cell is extracted, not summarised, and each cell cites the span it came from. Save the run as a workflow and a junior repeats it on the next matter in one click.

Data-room review — change-of-control sweep
Document Change of control Governing law Term
SPA — Meridian Consent required ¶ cl. 14.2 England & Wales ¶ cl. 21.1 Completion + 24 mo ¶ cl. 3.4
Shareholders’ Agmt Tag-along triggered ¶ cl. 9.1 England & Wales ¶ cl. 18.2 Perpetual ¶ cl. 2.1
Escrow Agreement Silent flagged · not found New York ¶ § 12(a) 18 months ¶ § 4
Supply Agmt (2019) Termination right ¶ cl. 15.3(b) Singapore ¶ cl. 22 Auto-renews yearly ¶ cl. 4.2
¶ 4 Engineering

Built like an instrument, not a wrapper.

Most legal AI is a very long prompt asking a model, politely, to behave. NyayVaani is engineered so that misbehaviour has nowhere to go.

Contracts

Typed tool contracts

Every action the model takes passes through a typed interface. Invalid output isn’t discouraged by prompt prose — it’s unrepresentable. The compiler holds the line so the model doesn’t have to.

Numbering

Deterministic numbering

Clause and paragraph numbering is computed by an engine in code, never generated by the model. Cross-references stay consistent through every edit, because arithmetic doesn’t hallucinate.

Prompts

Scope-gated instructions

Citation rules load only when documents are attached; drafting rules only when drafting. Smaller prompts mean fewer places to fail — and cheaper, faster runs on routine work.

Retrieval

Full reads, not lossy search

For a bounded matter, NyayVaani reads the documents — all of them — instead of guessing which fragments a vector index thinks are relevant. Retrieval is where accuracy leaks; so for matter-sized corpora, we don’t retrieve. We read.

Put it on the record.

NyayVaani is in early access with a small group of transactional lawyers. If your practice reviews data rooms, negotiates agreements, or drafts against precedent, we’d like your verdict.