The two most common Scrum Master certifications are Certified ScrumMaster (CSM) from Scrum Alliance and Professional Scrum Master (PSM) from Scrum.org.
Both validate knowledge of the Scrum framework, but the path to certification is very different.
Training Requirements
The biggest difference between the two credentials is the training requirement.
CSM requires a 16‑hour live course with a Certified Scrum Trainer (CST).
Candidates cannot access the exam without completing this training.
PSM has no training requirement. Anyone can purchase the exam and attempt it.
Exam Structure
CSM exam:
- 50 questions
- 60 minutes
- 74% passing score (37 correct)
PSM I exam:
- 80 questions
- 60 minutes
- 85% passing score
This means the PSM exam typically requires a higher score to pass.
Cost Differences
CSM cost:
- Training course: $350–$2,495
- Exam attempts included with course
PSM cost:
- Exam fee about $200
- Training optional
The lower cost of PSM is a major reason many candidates compare the two.
Renewal Requirements
CSM certification expires every two years.
Renewal requires:
- 20 Scrum Education Units (SEUs)
- $100 renewal fee
PSM certification does not expire.
Industry Recognition
Scrum Alliance launched in 2001 and was one of the earliest organizations promoting Scrum training.
Because of that history, the CSM credential appears in many job postings for Scrum Master roles.
PSM is also widely respected, particularly among organizations that prioritize deeper Scrum knowledge over formal training.
Which One Is Better?
Choose CSM if you want:
- Guided instruction from a Certified Scrum Trainer
- Structured learning with exercises
- Networking opportunities during training
Choose PSM if you want:
- A lower cost certification path
- A more challenging exam
- No mandatory training requirement