Profit Operating System for law firms

Price every matter like a finance team would.

Teryn AI helps law firms price fixed-fee matters properly. Build quotes against real lawyer overheads, scope each milestone before you commit, and watch live profitability the moment work begins.

No credit card required · 3 active matters · 60-second setup

Built for desktop. A larger screen gives you the full workspace.

The case against the billable hour

Kill the billable hour. Keep the margin.

The billable hour rewards slow lawyers and punishes efficient ones. It teaches clients to dread every email, every call, every minute on the clock. It hides cost overruns until the invoice lands. There is a better way to run a modern practice.

It punishes the client for your speed

The faster and more experienced you get, the less you earn per matter. Clients pay more for juniors learning on their case than for the partner who could have closed it in an afternoon. That is a broken incentive, not a pricing model.

It hides scope creep until it's too late

Hours pile up quietly until billing day. By then the matter is unprofitable and the write-off conversation has already started. Fixed fees with live telemetry surface the bleed on day three, not day ninety.

Clients want predictability, not surprise

In-house counsel and individual clients budget in fixed numbers. A quoted fee with clear inclusions, exclusions, and a deterministic amendment process is the difference between a referral and a complaint.

Fixed fees only work with real cost data

Moving away from hourly billing fails when firms guess the price. Teryn AI models internal cost per role, applies your margin and risk buffer, and tracks actual effort against the quote in real time.

Try the Cost Engine freeSign up takes under a minute.
Plans & pricing

Choose the plan that fits your practice.

Start on Early Access for free. Upgrade when you need more matters, seats, and archive depth. You'll sign in before any payment.

Early Access
Freewhile in beta

The full product on a small footprint — run real matters end to end.

  • 3 active matters, 1 seat
  • Full fixed-fee Cost Engine with weighted complexity scoring
  • Live Scope-Creep Monitor with profit meter
  • Velocity slippage tracking and overdue alerts
  • Tasks & deliverables checklist with completion timestamps
  • Milestone tracker per matter (lawyer-defined deliverables)
  • Client-facing Engagement Proposal (firm default template)
  • 1 Custom Proposal Template, save and reuse on any matter
  • Rate Configuration with active/inactive role toggles
  • Staff Allocation with experience-level mix
  • Disbursements catalog plus free-text custom lines
  • 1 fee amendment per matter
  • Full Tax Engine with unlimited VAT/sales-tax rules, inclusive/exclusive display, and reverse-charge support (included on every plan)
  • Settled / Closed archive (14-day window)
  • CSV export of every logged hour and disbursement
  • Email and direct-message support
Sign up for free
Most popular
Pro
£79per month

The working plan for practices billing on fixed-fee structures.

  • 25 active matters, up to 5 seats
  • Unlimited time, disbursement, and meeting logs
  • Everything in Early Access
  • 3 fee amendments per matter
  • Margin trajectory graph with remediation guidance
  • Senior-on-junior-work margin-drift alerts
  • Named staff performance tracking (allocated vs logged)
  • Practice presets to save your rate cards and reuse on every matter
  • Custom Proposal Templates, save, name, and link to any matter (up to 5)
  • Task suggestions library across all case types
  • Active / Closed / Settled matter sections
  • 5 GB secure document storage
  • 30-day matter archive
  • Priority email support, same business day
Sign in to upgrade
Best for firms
Max
£899per month

For firms standardising matter economics across every fee earner.

  • 25 seats included (50-seat upgrade available)
  • Everything in Pro, with no caps on logs, milestones, or alerts
  • Unlimited matters and fee amendments
  • Custom role library to build roles beyond the default set
  • Multi-currency rate cards for cross-border matters
  • Unlimited saved Proposal Templates with one-click matter linking
  • 50 GB secure document storage
  • Deep matter archive, 1 year of read-only history with full search
  • Cross-matter scope-creep dashboards
  • Bulk CSV export across the whole practice for reporting
  • Priority email support, within hours, not days
  • Early access to new Cost Engine and Monitor features
Seats
Sign in to upgrade · 25 seats

Prices shown in GBP based on your location. VAT added at checkout where applicable. Change currency anytime in Profile Settings.

Voices from the profession

Don't take our word for it — hear what the profession says about the billable hour.

Real quotes from the lawyers, authors and firm leaders who've spent decades arguing that fixed-fee pricing is the future. Scroll →

The legal industry is being reshaped by clients who buy legal services the same way they buy every other business input — on scope, price and outcome. Firms still selling time are competing on the axis buyers value least.

Mark A. Cohen
CEO, Legal Mosaic · Forbes senior contributor on legal innovation
Forbes — Legal Innovation column
Cost Engine

Price by outcome, not by hour.

Model every fixed fee against your firm's true cost-to-deliver across salary, on-cost, utilisation and target margin, so you win the work that is profitable, not just the work that fills the diary.

Kill the billable hour. I'm a trial lawyer. I bill by the hour. So do the associates who work for me. It is frankly nuts. The billable hour rewards slow lawyers and punishes efficient ones.

Evan R. Chesler
Presiding Partner, Cravath, Swaine & Moore LLP
Forbes — 'Kill The Billable Hour' (Jan 2009)
Margin at Risk

Scope creep never waits for the invoice.

Margin at Risk tracks the agreed fee, live cost-to-deliver and milestone progress in real time, so overruns surface on day three, not in a write-off conversation at month-end.

Tomorrow's lawyers will need to be very different from most of today's lawyers. Clients will no longer tolerate being charged for effort rather than value delivered.

Prof. Richard Susskind OBE
Author · President, Society for Computers and Law
Tomorrow's Lawyers, 3rd ed. (Oxford University Press, 2023)
Milestones

Priced by outcome, tracked by deliverable.

Break each matter into milestones with owners, effort and cost. Clients see progress against outcomes; you see the true cost-to-deliver as each stage completes.

Corporate legal departments are under sustained pressure to control outside-counsel spend, and alternative fee arrangements have moved from experiment to expectation on a growing share of matters.

Thomson Reuters Institute
2025 State of the Legal Market Report
Thomson Reuters Institute & Georgetown Law CSSL (Jan 2025)
Fee Amendments

Change the price the professional way.

When scope shifts, issue a formal Fee Amendment with a calculated uplift backed by milestone data and cost telemetry, so there is no awkward invoice-day surprise and no write-off.

Clients continue to expect greater price transparency and predictability from their law firms, and firms that cannot deliver both are steadily losing share of wallet.

Wolters Kluwer
2024 Future Ready Lawyer Survey
Wolters Kluwer Legal & Regulatory (2024)
Practice Presets

Confidence, built from your own precedent.

Practice Presets and complexity weightings let any fee-earner produce a defensible fixed quote in minutes, using the same assumptions your finance team already trusts.

More than 50% of general counsel surveyed reported that legal culture and resistance to change is the greatest obstacle to modernization.

EY
EY Law Survey 2022
EY Law Survey (2022), cited by Forbes Legal Innovation column
Teryn AI

Built for the transition.

From the first quote to the final invoice, Teryn AI replaces guesswork with a live profit operating system designed for fixed-fee law firms.

The legal industry is being reshaped by clients who buy legal services the same way they buy every other business input — on scope, price and outcome. Firms still selling time are competing on the axis buyers value least.

Mark A. Cohen
CEO, Legal Mosaic · Forbes senior contributor on legal innovation
Forbes — Legal Innovation column
Cost Engine

Price by outcome, not by hour.

Model every fixed fee against your firm's true cost-to-deliver across salary, on-cost, utilisation and target margin, so you win the work that is profitable, not just the work that fills the diary.

Kill the billable hour. I'm a trial lawyer. I bill by the hour. So do the associates who work for me. It is frankly nuts. The billable hour rewards slow lawyers and punishes efficient ones.

Evan R. Chesler
Presiding Partner, Cravath, Swaine & Moore LLP
Forbes — 'Kill The Billable Hour' (Jan 2009)
Margin at Risk

Scope creep never waits for the invoice.

Margin at Risk tracks the agreed fee, live cost-to-deliver and milestone progress in real time, so overruns surface on day three, not in a write-off conversation at month-end.

Tomorrow's lawyers will need to be very different from most of today's lawyers. Clients will no longer tolerate being charged for effort rather than value delivered.

Prof. Richard Susskind OBE
Author · President, Society for Computers and Law
Tomorrow's Lawyers, 3rd ed. (Oxford University Press, 2023)
Milestones

Priced by outcome, tracked by deliverable.

Break each matter into milestones with owners, effort and cost. Clients see progress against outcomes; you see the true cost-to-deliver as each stage completes.

Corporate legal departments are under sustained pressure to control outside-counsel spend, and alternative fee arrangements have moved from experiment to expectation on a growing share of matters.

Thomson Reuters Institute
2025 State of the Legal Market Report
Thomson Reuters Institute & Georgetown Law CSSL (Jan 2025)
Fee Amendments

Change the price the professional way.

When scope shifts, issue a formal Fee Amendment with a calculated uplift backed by milestone data and cost telemetry, so there is no awkward invoice-day surprise and no write-off.

Clients continue to expect greater price transparency and predictability from their law firms, and firms that cannot deliver both are steadily losing share of wallet.

Wolters Kluwer
2024 Future Ready Lawyer Survey
Wolters Kluwer Legal & Regulatory (2024)
Practice Presets

Confidence, built from your own precedent.

Practice Presets and complexity weightings let any fee-earner produce a defensible fixed quote in minutes, using the same assumptions your finance team already trusts.

More than 50% of general counsel surveyed reported that legal culture and resistance to change is the greatest obstacle to modernization.

EY
EY Law Survey 2022
EY Law Survey (2022), cited by Forbes Legal Innovation column
Teryn AI

Built for the transition.

From the first quote to the final invoice, Teryn AI replaces guesswork with a live profit operating system designed for fixed-fee law firms.

Frequently asked

The questions firms ask first.

Six questions we hear on almost every first call. The full FAQ goes deeper on payments, the Tax Engine, security, scale, and regulatory compliance.