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Theory-test preparation with learner, instructor and library access routes.

Computational algebra and number-theory software

Symbolic, numerical and number-theory calculators

DVSA-partner learning resources, practice tests and theory preparation for drivers and riders.

Free music theory exercises for learners and teachers

Music theory exercises and analytical articles

Symbolic tensor calculations for field-theory problems

Computational discrete algebra with a specialist language

An interactive introduction to musical relationships

Visual chord writing informed by analysed songs

Japanese household spending with category budgets and daily reminders

Interval, scale, singing and rhythm exercises

Free lessons on notation, rhythm, scales and harmony.

Category budgets, subscription reminders and optional bank imports

Apple-device budgets with shared accounts and purchase automation

Household category trees and shared finance files across devices

Personal expense records with receipts and adjustable category budgets

Self-hosted category budgets with rules and configurable spending charts

Generate distinct colours for categories in a data visualization.

An interconnected reference for advanced mathematical ideas

Japanese household reports with yearly views and category averages

Connected UK spending, category budgets and bill-change alerts

Review spending, rollovers and upcoming charges across US accounts

Personal account records with separate budget periods and rollover controls