Terms of use
The website
This website is offered as it is, as a reference for practising handwriting. The check is a guide for thinking about how you write; it is not an assessment of calligraphy or handwriting and not a qualification.
The iPhone app
The Okeiko iPhone app is covered by Apple's Standard End User Licence Agreement (EULA): apple.com/legal/internet-services/itunes/dev/stdeula
Character data and typefaces
The licences of the character-shape data and the typefaces are on Licences and credits.