The Digital SAT is adaptive — your performance on the first module of each section determines the difficulty of the second. TutorMate's SAT practice mirrors this, adjusting difficulty in real time so your score-band prediction reflects how the real exam will behave.
The ACT is not adaptive and includes a dedicated Science section, which rewards data-interpretation speed more than deep content knowledge. TutorMate's ACT practice emphasizes timed, full-section drills to build that speed.
If you're strong in math relative to verbal, the SAT's heavier math weighting may favor you. If you read data and graphs quickly, the ACT's Science section can be a relative strength.
Many students benefit from taking one full diagnostic of each before committing — TutorMate can generate both from the exam prep dashboard.