Learn the deterministic power of accounting.
Books is a learning system as much as a platform. Follow a track, read a playbook, or build on the API — and help grow a community that expects financial truth to be calculated, not guessed.
Structured paths, from first principles to proof.
Foundations of Deterministic Accounting
What it means to calculate financial truth from governed rules — and why AI should explain, never invent.
The Continuous Close
Close throughout the month: accruals, prepayments, reversals and flux — instead of discovering problems at month-end.
Revenue Recognition, Deterministically
Contracts, obligations and deferred revenue recognised by rule, not by spreadsheet.
Multi-Entity & Consolidation
Entities, intercompany, FX and eliminations — group financial control that reconciles.
Forecasting with Horizon
Model tomorrow before you decide: digital twin, counterfactuals and variance learning.
Proof with Frontier
Turn a transaction into evidence, authority, a hash, a credential and verification.
Practical, opinionated, deterministic.
Month-end close in a week, not a fortnight
Read →MTD VAT without the panic
Read →Setting up multi-entity consolidation
Read →Four-eyes approval & materiality controls
Read →Reading a deterministic P&L
Read →From spreadsheet forecast to Digital Twin
Read →Docs & how-to
Step-by-step help for every part of Books — setup, banking, VAT, payroll, close and reporting.
Open help centre →What shipped
A running log of new capabilities, engines and integrations across Books, Horizon, Frontier and Nexus.
See updates →Build on Books
Scoped API keys, webhook signing and a deterministic data model you can build on with confidence.
Read the API docs →Help develop the deterministic power of accounting.
Every business that adopts deterministic accounting makes financial truth the default. Start free, learn the tracks, and build.