Help and product information for Tristimulus.
Tristimulus is a rigorous color-science bench for people who work with color for a living — colorists, print and brand designers, photographers, and vision researchers. It replaces a pile of scattered web tools with one precise, on-device instrument. Everything is computed locally from bundled reference data; nothing is uploaded and no account is required.
Does the app need an account or subscription?
No. It is a one-time-download app with no account, advertising, analytics, or in-app purchase.
Does it work offline?
Core features and bundled reference data work on-device without a developer-operated service.
Where is my information stored?
Your color values, saved conversions, palettes, LUT settings, and preferences remain in the app's local storage.
How do I remove local data?
Use available delete or reset controls. Removing the app removes its local container, subject to backups you control through Apple.
What are the limits?
Color results depend on source profiles, displays, instruments, and workflows; verify critical production output with calibrated equipment.
Email support@shadowfetch.com with the app name, device model, iOS version, and a concise description of the issue.