# Timebutler > Timebutler is an HR SaaS for absence management, vacation tracking, and time > tracking (UI in German and English). app.timebutler.com is the login-protected > web application — in-app pages require a user account. The machine-usable > surface of this host is the REST API v2 below. Product and pricing information: > https://www.timebutler.com (AI dataset: https://www.timebutler.com/llms.txt). ## API v2 REST API for absence requests and approvals, cancellation requests, substitute requests, real-time time clock, time entries and time-tracking summaries, reference data (absence types, categories, projects), and user profile. Auth: OAuth 2.0 with JWT bearer tokens (grant types: password, refresh_token, mfa_totp, sso_id_token, sso_code) or tb_-prefixed personal access tokens. - [API reference, German](https://app.timebutler.com/api/v2/docs) - [API reference, English](https://app.timebutler.com/api/v2/docs?lang=en) - [OpenAPI 3.0 specification, JSON](https://app.timebutler.com/api/v2/openapi.json) - [OpenAPI 3.0 specification, YAML](https://app.timebutler.com/api/v2/openapi.yaml) ## Public pages - [Log in](https://app.timebutler.com/login/) - [Sign up, English](https://app.timebutler.com/create-user/) - [Sign up, German](https://app.timebutler.com/nutzerkonto-erstellen/) ## Optional - [Support](mailto:support@timebutler.com)