Comparison · Privacy and control

On-premise vs cloud legal AI, compared honestly.

Cloud tools are genuinely better at some things. Here is where the difference actually falls, including where it does not favour us.

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Where the two models diverge

Four differences that matter, stated without spin.

Disclosure

Cloud: the material reaches a third party, governed by contract. On-premise: it does not leave, so the question does not arise.

Cost shape

Cloud: recurring, often per-seat, increasingly usage-metered. On-premise: capital up front — software plus a workstation — then nothing.

Speed of change

Cloud is genuinely faster to improve; a hosted model can be upgraded overnight. Offline updates are deliberate, which is slower on purpose.

Scale

Cloud scales elastically. On-premise scales by buying another workstation, which is a real constraint and worth saying.

What stays true on every matter

These do not change by practice area, firm size, or the question asked.

Nothing leaves the firmNo cloud, no API call, no telemetry. The matter is read on hardware the firm owns.

Owned, not subscribedA one-time purchase. No per-seat monthly fee and no usage meter.

Citations verified on-machineAuthority is checked against a local corpus, not recalled from a model’s memory.

The entire matterFull workup across the whole file — not a chat window over one document.

Runs on your workstationA current RTX-class GPU. Designed to run with no internet connection at all.

Decide it on your own matters.

The comparison that counts is on your files, your constraints and your clients' instructions. We will help you run it.

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Questions firms ask

The answers below are specific to this page’s subject.

Is cloud legal AI insecure?

No. Major providers run serious security programmes. The distinction is not competence, it is whether a third party holds privileged material at all.

Where is cloud genuinely better?

Elastic scale, faster model improvements, and no hardware to buy or administer. If those matter more to a firm than the disclosure question, cloud is the right answer for them.

Can a firm run both?

Many will — a cloud tool for general research and an offline system for privileged material. The matter-level decision is the one that counts.

What does the total cost comparison look like?

Compare capital plus review time against three years of per-seat subscription plus review time. Review effort is the line most firms omit from both sides.

Other pages covering the same ground from a different angle.

Zero data leave / no cloud legal AI Best offline alternative to cloud legal AI Owned legal AI vs subscription legal tools On-premise legal AI platform Air-gapped AI for law firm data security Offline legal AI vs Lexis+ AI / Westlaw AI

See it run on a real matter.

A briefing walks the whole path — intake, workup, the Adjudicator's pass, and the work product that comes out the other side.