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Legal · head to head

Luminance vs Tabs3

Luminance logo

Luminance

Legal

Machine learning contract analysis for review, negotiation and compliance

From
On request
Rated
-
Full reviewWebsite
Tabs3 logo

Tabs3

Legal

Billing, trust and general ledger accounting for small and mid-sized US law firms

From
$69/month
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Luminance no independent evaluation of its accuracy has been published, and it did not take part in the Vals Legal AI Report, so buyers have only vendor-produced evidence to work from.; Tabs3 the interface follows Windows desktop conventions from an earlier era, so new fee earners and staff take longer to train than they would on a browser-based competitor.
  • They diverge on capability: Luminance covers Anomaly detection, Tabs3 covers Tabs3 Billing.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Luminance and Tabs3 actually diverge.

Attributes where Luminance and Tabs3 differ
AttributeLuminanceTabs3
Starting priceOn request$69/month
Pricing modelquotePer user per month
PlatformsWeb, WindowsWindows, Web, iOS, Android

Identical on both: free tier (No), user rating (Not yet rated), category (Legal).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Luminance

  • Anomaly detection
  • Contract negotiation
  • Due diligence review
  • Multi-language analysis
  • Document comparison

Only in Tabs3

  • Tabs3 Billing
  • Trust accounting
  • General ledger and accounts payable
  • PracticeMaster
  • On-premises or cloud subscription

What people use each for

The jobs each tool is most often brought in to do.

Luminance

  • In-house teams auditing a contract estate for a specific exposure such as change of controlnot Tabs3
  • Procurement and compliance functions reviewing supplier agreements at scalenot Tabs3
  • Transaction teams reviewing large contract populations against a deal deadlinenot Tabs3
  • Negotiation teams applying a standard playbook consistently across many counterpartiesnot Tabs3

Tabs3

  • Small firms billing hourly that want billing and the firm general ledger in one system rather than reconciling twonot Luminance
  • Practices that must run three-way trust reconciliation without a separate bookkeeping packagenot Luminance
  • Firms that need an on-premises deployment because of client or insurer restrictions on cloud-hosted matter datanot Luminance
  • Long-established practices replacing a decades-old billing system while keeping accounting in housenot Luminance

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Luminance

  • No independent evaluation of its accuracy has been published, and it did not take part in the Vals Legal AI Report, so buyers have only vendor-produced evidence to work from.
  • The one named accuracy benchmark, ContractIQ Bench, was built, run and scored by Luminance on a dataset it has not released, against comparison models it does not name.
  • Value scales with document volume, so an organisation reviewing tens rather than thousands of contracts will not recover the licence cost.
  • Output still requires qualified review, so it reduces reading time rather than removing the lawyer, and staffing plans that assume otherwise fail.
  • Pricing is not published, so cost per matter cannot be modelled until after a sales process and a proof of concept.

Tabs3

  • The interface follows Windows desktop conventions from an earlier era, so new fee earners and staff take longer to train than they would on a browser-based competitor.
  • On-premises deployment puts backup, disaster recovery, server upgrades and patching on the firm, which small practices without IT support routinely underestimate.
  • It is built around hourly and flat fee billing, so a contingency practice tracking case costs and settlement disbursements will find the case financial model a poor fit.
  • PracticeMaster case management is priced separately from billing, so the advertised per-user rate is not what a firm wanting matter management actually pays.
  • Choosing the on-premises option no longer avoids a subscription, because it is billed per user per month like the hosted version.

Pricing, plan by plan

Luminance

On request
  • Luminance$undefined/year
    • Enterprise licensing quoted per organisation
    • Scoped by user count and document volume
    • Proof of concept normally run before contracting

Tabs3

$69/month
  • OnSite Subscription$69/month
    • Deployed on the firm server
    • Billing, trust accounting and general ledger
    • PracticeMaster add-on at 32 USD per user per month
  • Tabs3 Cloud$89/month
    • Hosted by the vendor
    • Billing, trust accounting and general ledger
    • PracticeMaster add-on at 35 USD per user per month

Which should you pick?

Choose Luminance if

  • You need anomaly detection.
  • You work on Web, Windows.
  • You also want contract negotiation.
Luminance review

Choose Tabs3 if

  • You need tabs3 billing.
  • You work on Windows, Web, iOS, Android.
  • You also want trust accounting.
Tabs3 review

Questions people ask

Is Luminance or Tabs3 better?
Neither clearly leads. Luminance starts at On request and Tabs3 at $69/month, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Luminance or Tabs3?
Luminance starts at On request and Tabs3 at $69/month.
Does Luminance or Tabs3 run on more platforms?
Luminance runs on Web, Windows. Tabs3 runs on Windows, Web, iOS, Android.
What is Luminance best used for?
Luminance is most often used for in-house teams auditing a contract estate for a specific exposure such as change of control, procurement and compliance functions reviewing supplier agreements at scale, transaction teams reviewing large contract populations against a deal deadline, negotiation teams applying a standard playbook consistently across many counterparties. Of those, in-house teams auditing a contract estate for a specific exposure such as change of control and procurement and compliance functions reviewing supplier agreements at scale are not what Tabs3 is typically brought in for.
What can Luminance do that Tabs3 cannot?
Luminance covers Anomaly detection, Contract negotiation, Due diligence review, Multi-language analysis. Tabs3 covers Tabs3 Billing, Trust accounting, General ledger and accounts payable, PracticeMaster.

Answered from the vendors’ own pages

Luminance: Is Luminance's accuracy independently verified?

No independent verification has been published. It did not participate in the Vals Legal AI Report, the main lawyer-baselined benchmark, and the only named benchmark in its materials is one it built and ran itself. Treat the published figures as vendor claims and run a proof of concept on your own documents.

Tabs3: Is Tabs3 right for a personal injury firm working on contingency?

No. It is built for hourly and flat fee billing with a firm general ledger. A contingency practice needs case cost tracking and settlement disbursement handling, which is what CASEpeer and Filevine are built around.

Luminance: What do the ninety per cent time-saving claims mean?

They are unattributed marketing figures about time and cost rather than accuracy, published without methodology, dataset or baseline. They are not a measure of how often the software is right.

Tabs3: Can I still buy Tabs3 as a perpetual licence?

No published perpetual price exists. The on-premises option, called OnSite Subscription, starts at 69 USD per user per month, with the hosted Tabs3 Cloud starting at 89 USD per user per month.

Luminance: Who backs Luminance?

It launched in 2016 with backing from Invoke Capital, the fund founded by Mike Lynch, and has since raised further rounds led by March Capital and Point72 Private Investments.

Tabs3: Does it replace QuickBooks?

For most firms yes. It includes a double-entry general ledger and accounts payable, which is the usual reason firms choose it over billing-only products.

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