Short answer
CELPIP is not automatically harder than IELTS. Difficulty depends on your strengths. If you prefer computer-only testing and structured prompts, CELPIP often feels easier. If you perform best in live speaking interviews, IELTS may feel more natural.
Why people find CELPIP easier
Candidates in Canada often find CELPIP contexts familiar (workplace, community, daily life). Score reporting is directly aligned to CLB language targets used in many immigration pathways.
Why people find IELTS easier
Some candidates gain confidence from face-to-face speaking and prefer IELTS writing style. If your speaking confidence increases with human interaction, IELTS can produce more stable results.