The IELTS ACER practice app is free to download and runs on macOS and Windows. It auto-updates, so you always have the current test library without reinstalling.
Free to download — three practice tests included when you sign up
macOS and Windows, with automatic updates
Full Listening and Reading mocks, or a single section when you are short on time
AI Writing Check on Task 1 and Task 2 (band estimate plus written feedback)
AI Speaking practice across all three parts, by voice