Computer-based IELTS (CB-IELTS) is an alternative version of the International English Language Testing System (IELTS) that is delivered on a computer instead of on paper. The test content and format are the same for both versions, but the way you take the test and receive your results is different.

One key difference is that in the CB-IELTS, all three sections of the test - Listening, Reading, Writing, are completed on a computer, whereas Speaking test will remain the same and will be a face to face conversation with the examiner. In contrast, the paper-based IELTS (PB-IELTS) requires test-takers to complete the Listening, Reading, and Writing sections on paper and the Speaking section is conducted face-to-face with an examiner.

Another difference is the way answers are entered. In the CB-IELTS, test-takers type their answers directly into a computer, while in the PB-IELTS, they write their answers on paper.

One advantage of CB-IELTS is that it offers more test dates and availability compared to PB-IELTS. Additionally, the results for CB-IELTS are generally available faster, within 3 to 5 days compared to PB-IELTS which takes 13 days. Overall, the content and difficulty level of the test is the same for both versions, and it is up to the individual test-taker to decide which version is better suited for their needs and preferences.