Robin Image Optimizer – Unlimited Image… vs Kraken.io Image Optimizer (2026)
Detailed side-by-side comparison of two WordPress plugins, based on real-time data from WordPress.org.
Robin Image Optimizer – Unlimited Image…
100K+ active installs
Free
Kraken.io Image Optimizer
10K+ active installs
Free
Quick Verdict
As of April 2026, Kraken.io Image Optimizer has a higher user rating (4.5/5 from 119 reviews) while Robin Image Optimizer – Unlimited Image… leads in active installations (100K+ vs 10K+). Both are free WordPress plugins. Robin Image Optimizer – Unlimited Image… has accumulated 2.1M+ total downloads while Kraken.io Image Optimizer has 399K+.
Detailed Comparison
| Metric | Robin Image Optimizer – Unlimited Image… | Kraken.io Image Optimizer | |
|---|---|---|---|
| Rating | 4.4/5 | ► | 4.5/5 |
| Total Reviews | 125 | ◄ | 119 |
| Active Installs | 100K+ | ◄ | 10K+ |
| Total Downloads | 2.1M+ | ◄ | 399K+ |
| Support Resolution | 100% | N/A | |
| Last Updated | 3 weeks ago | ◄ | 1 month ago |
| First Released | 2018 | 2014 | |
| Age | 8 years | 12 years | |
| WP Requires | 5.6+ | 4.9+ | |
| PHP Requires | 7.4+ | 5.6+ | |
| Business Model | Free | Free | |
| Latest Version | 2.0.4 | 2.7.0 |
Rating Breakdown
Robin Image Optimizer – Unlimited Image…
Kraken.io Image Optimizer
Download Trends
Over the past 30 days, Robin Image Optimizer – Unlimited Image… averaged approximately 1,567 daily downloads while Kraken.io Image Optimizer averaged 208.
Recent Reviews
Robin Image Optimizer – Unlimited Image… Reviews
Well done
It would be nice to add disabling scheduled launch. Manual only
Best Plugin
The best plugin for image optimization. But after the latest update, there’s a delay when converting Image Features to webp. Although it might just be my feeling. BTW, thanks.
Utter Waste Of Time
Your “fix” lasted for about three minutes. I have since then waited to give you time to migrate your servers. I have uninstalled and reinstalled the plugin several times. I have tried to get it to opt
Kraken.io Image Optimizer Reviews
Poor Quality
Not worth the time.
Terrible Customer Service
As others are noting here, their customer service is terrible. In fact I’d use the word “non-existent”. After signing up with an account I decided that the service was no longer what I needed and cont
Worst service I’ve encountered
Whatever you do, do not use this service. They will happily charge your credit cars, but when you try to reach them for support, they never respond. Their service is a disgrace.
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Frequently Asked Questions
Is Robin Image Optimizer – Unlimited Image… or Kraken.io Image Optimizer more popular?
Which has better ratings — Robin Image Optimizer – Unlimited Image… or Kraken.io Image Optimizer?
Are Robin Image Optimizer – Unlimited Image… and Kraken.io Image Optimizer free?
Which plugin has better support — Robin Image Optimizer – Unlimited Image… or Kraken.io Image Optimizer?
Which plugin is updated more frequently?
Plugin data sourced from WordPress.org. Comparison and analysis by PluginSift.