Apple OS X Mountain Lion
Reviews
Star rating
Rank in Operating System
Pros and cons
Pros
- Ease of Use
- Speed/Performance
- New Features
- User-Friendly
- Easy Installation
- Regular Updates
Cons
- Compatibility Issues
- Performance Issues
- Installation Difficulties
- Limited Apps/Store
- OS Incompatibility
- Limited Software
Traffic & LLM citations
Source: G2 review data
Winning from
Losing to
Key stats
Adoption by company size
| Segment | Share of reviews |
|---|---|
| Small Business | 46.4% |
| Mid-Market | 32.1% |
| Enterprise | 21.5% |
Quarterly history
| Quarter | Reviews | Star rating |
|---|---|---|
| 2025 Q1 | 2 | 4.8 |
| 2025 Q2 | 1 | 5.0 |
| 2025 Q3 | 5 | 3.8 |
| 2025 Q4 | 4 | 3.6 |
| 2026 Q1 | 9 | 4.4 |
| 2026 Q2 | 7 | 3.7 |
Satisfaction ratings
What reviewers say
Mountain Lion Transformed Mac Messaging with Messages
“Mountain Lion completely changed how Mac users communicated by replacing iChat with Messages.”
It was great but is no longer supported
“I WAS easy to use and stable, but it ended support in 2015. I still run it on some older 17" macbook pro that are from 2011/2012 since they were the last version with nvidia gpus which i sometime use for local ML development. But with no security updates in nearly a decade I c”
Mountain Lion Delivers a More Integrated, Secure, User-Friendly Experience
“Overall, Mountain Lion stands out for strengthening ecosystem integration, improving user experience, and taking meaningful steps toward a more secure operating environment.”