WordPress plugin comparison
IOO vs Kraken.io Image Optimizer
At a glance
- Kraken.io Image Optimizer has more active installs: 10K+, against fewer than 10 for IOO.
- On a typical day, Kraken.io Image Optimizer is downloaded about 97 times, IOO about 2.
- IOO has no reviews yet.
- IOO was updated more recently: Sep 6, 2026, against Jun 22, 2026 for Kraken.io Image Optimizer.
- IOO is tested with a newer WordPress: 7.1.4, against 7.0.8 for Kraken.io Image Optimizer.
- Kraken.io Image Optimizer has been around longer: since 2014, against 2026 for IOO.
Line by line
Kraken.io Image Optimizer leads on 4 of 6 comparable lines.
| Metric |  IOO |  Kraken.io Image Optimizer |
|---|---|---|
| Popular rank | #67,979 | #1,581 |
| Active installs | Fewer than 10 | 10K+ |
| Downloads, last 30 days | 61 | 4.3K |
| Rating | No ratings | 4.5(119) |
| Support threads resolved | – | – |
| Tested up to | 7.1.4 | 7.0.8 |
| Search multiplier | ×0.05 | ×0.83 |
| Last release | 2 months ago | 4 months ago |
| Requires PHP | 7.4 | 5.6 |
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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