For life with your cat
PurrTools is a small collection of free tools for everyday cat care. We believe useful tools should be easy to understand, clear about their assumptions, and respectful of your privacy.
Our approach
Calculators show their methodology and relevant references. Health-related results are estimates, not veterinary guidance tailored to your cat. This site does not claim veterinary review or professional accreditation.
Private by design
No account is required. Calculations run in your browser. Only the weight diary is saved locally; you control its export and deletion.
Two languages, one toolkit
Every tool has an English and Chinese page. The language link takes you to the same tool, and the weight diary is shared between languages on the same browser and site.