UX Invariants

Simple, One-Time Pricing

Pay once. Use indefinitely. No subscriptions. No usage tracking.

Individual

$49 One-time

For solo builders and independent work.

Includes

  • Full UX invariant set
  • Unlimited personal projects
  • Unlimited client work
  • Framework- and tool-agnostic
  • Delivered as Markdown

Designed for use in

  • System prompts
  • AGENTS.md
  • CI / human review checklists

Best for

  • Indie hackers
  • Freelancers
  • Solo founders
  • Senior engineers working independently

Team

$249 One-time

For teams sharing invariants across products, repos, or agents.

Includes

  • Everything in Individual
  • Internal team sharing permitted
  • Use across multiple projects and codebases
  • Suitable for shared internal standards

Common use cases

  • Shared prompt libraries
  • Internal AI development guidelines
  • Faster onboarding of new contributors
  • Reduced UX regressions from LLM output

Best for

  • Startups
  • Small teams
  • Agencies
  • Growing products

Company

$499 One-time

For companies where AI-assisted development is institutionalized.

Includes

  • Everything in Team
  • Explicit rights for broad internal distribution
  • Designed for many contributors and long-lived products

Best for

  • Established companies
  • Multiple teams using LLMs
  • Large internal codebases and agents

Pricing & Trust

This product is sold on an honor system.

  • no license enforcement
  • no DRM
  • no usage tracking

Choose the tier that reflects the value it provides to your organization, not how hard it would be to bypass.

If these invariants save review time, prevent UX regressions, align multiple contributors, or reduce rework from AI-generated code, then you’re exactly who this is for.

Why One-Time Pricing?

These invariants are not a service.

They are codified experience.

They don’t expire. They don’t require ongoing support. Their value compounds as your product and team grow.

Pay once. Reuse everywhere.

Still Unsure Which Tier to Choose?

A simple rule of thumb:

  • Only you will use it → Individual
  • It will be shared internally → Team
  • Many contributors or teams → Large Team

If you’re on the fence, choose the higher tier.

Built for Durable Constraints

  • No subscriptions
  • No lock-in
  • No tracking
  • Built for engineers who value durable constraints over clever prompts