# Zero Drift

> Zero Drift Ltd is a UK software studio that builds complete, deterministic, cheap-to-run software for regulated markets. This is zerodrift.co.uk, not the US company ZeroDrift, Inc.

Key facts:

- Zero Drift Ltd, UK software studio, company 17202217 — not the US company ZeroDrift, Inc.
- The studio publishes its methods, prices and delivery evidence in the linked primary pages.

## Build

- [Build a complete product](https://zerodrift.co.uk/build/): Zero Drift builds complete production software from a compiled specification, with the evidence and operating handover included.

## Refactor

- [Recover a drifting system](https://zerodrift.co.uk/refactor/): Zero Drift builds an executable equivalence boundary first, lands the replacement behind it and keeps a rollback net until the evidence says the old path can retire.

## Public sector

- [Build for public services](https://zerodrift.co.uk/public-sector/): Zero Drift combines live education software with senior delivery experience across regulated national platforms and public services.

## Review

- [Get the technical truth](https://zerodrift.co.uk/review/): Zero Drift tests a system and its delivery process against explicit, falsifiable properties, then reports the evidence and remediation path.

## Build with us

- [Build with us](https://zerodrift.co.uk/build-with-us/): Zero Drift can design, build, host and run qualifying products for a share of revenue while the domain founder keeps the business and product IP.

## Fractional CTO

- [Fractional technology leadership](https://zerodrift.co.uk/fractional-cto/): Zero Drift's founders bring product, CTO and architecture leadership from regulated platforms and turn decisions into an evidence-backed operating cadence.

## Rates

- [Rates and how we quote](https://zerodrift.co.uk/rates/): 10 published service lines, quoted from written scope.

## Method

- [How we build](https://zerodrift.co.uk/method/): Spec-first delivery, explicit gates and evidence-backed handover.
- [Utility, not SaaS](https://zerodrift.co.uk/method/anti-saas/): The utility economics behind complete, cheap-to-run software.
- [The deterministic gap](https://zerodrift.co.uk/method/determinism/): Where inference ends and the deterministic system begins.

## Products

- [Phoenix Ember](https://zerodrift.co.uk/products/ember/): Inclusion-first assessment, intervention and evidence software for schools.
- [Phoenix Nest](https://zerodrift.co.uk/products/nest/): A management information system designed around the work a school actually does.
- [Phoenix Eyrie](https://zerodrift.co.uk/products/eyrie/): An authority view across education data without replacing school-owned systems.
- [Phoenix Flight](https://zerodrift.co.uk/products/flight/): Post-16 software built around learner progress and support.
- [Quorate](https://zerodrift.co.uk/products/quorate/): Governance software for clubs, councils and membership organisations.
- [ClarityCrowd](https://zerodrift.co.uk/products/claritycrowd/): A complete, flat-priced people system for UK employers.
- [SelfFiled](https://zerodrift.co.uk/products/selffiled/): Making Tax Digital software designed as a calm annual utility.
- [Certifitrades](https://zerodrift.co.uk/products/certifitrades/): Compliance evidence and certificate management for trades.
- [TenantTidy](https://zerodrift.co.uk/products/tenanttidy/): Compliance software for UK landlords and their tenants.

## Papers

- [Papers](https://zerodrift.co.uk/papers/): Dated, attributable papers on verification, delivery and software economics.

## Writing

- [Writing](https://zerodrift.co.uk/writing/): Notes, essays and a dated delivery changelog.

## About

- [About Zero Drift](https://zerodrift.co.uk/about/): The UK studio, its founders and how the Kent–Manchester rotation works.

## Trust

- [Trust and procurement](https://zerodrift.co.uk/trust/): Company details, security posture, insurance and legal information.