WordPress plugin comparison
Robin Image Optimizer vs UltraCache
At a glance
- Robin Image Optimizer has more active installs: 100K+, against 20+ for UltraCache.
- On a typical day, Robin Image Optimizer is downloaded about 736 times, UltraCache about 3.
- UltraCache is rated higher: 5.0 out of 5 from 3 reviews, against 4.4 from 132 reviews.
- Robin Image Optimizer was updated more recently: Nov 3, 2026, against Aug 21, 2026 for UltraCache.
- Both are tested up to WordPress 7.1.4.
- Robin Image Optimizer has been around longer: since 2018, against 2026 for UltraCache.
Line by line
Robin Image Optimizer leads on 5 of 6 comparable lines.
| Metric |  Robin Image Optimizer |  UltraCache |
|---|---|---|
| Popular rank | #454 | #38,319 |
| Active installs | 100K+ | 20+ |
| Downloads, last 30 days | 42.6K | 69 |
| Rating | 4.4(132) | 5.0(3) |
| Support threads resolved | 100% | – |
| Tested up to | 7.1.4 | 7.1.4 |
| Search multiplier | ×1.27 | ×0.24 |
| Last release | 6 days ago | 2 months ago |
| Requires PHP | 7.4 | 8.1 |
From WordPress.org's public data, refreshed every night. Downloads are WordPress.org's official daily figures for the last 30 days.
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