Developer's API Documentation : Register & Stats
Toodledo's API is free to use, for any application, even commercial applications. However, you must use the API efficiently and not cause undue stress on our servers. Additionally, every application that uses the API must register, for free, with Toodledo so that we have some way to contact you if we notice a problem. Registration also gives you some useful information, such as the number of people using your application across your application's versions
You should register each different application that you create. You should not register each version of the same application. Updates to the same app can be tracked with the same Client ID by passing the version number into the API.
Client IDs created with API 1.0 are not compatible with API 2.0 and Client IDs created with API 2.0 are not compatible with API 3.0. You'll need to create a new Client ID if you upgrade your app from an older version of our API. IF you are upgrading to API 3.0 and want to continue to access the metadata that you have stored with API 2.0, please contact us.
You must sign into your Toodledo account to register a new application for development.