Side by side

CompressO vs ImageOptimizer

Both stand on image compression software. Which one you can start free with, which one lets you read the code, and what each costs once you pay.

CompressO

Free plan LinuxMacWindows

CompressO offers broad media editing and conversion tools while keeping processing on the device. Its free MIT-licensed model and privacy claims suit users who prefer local workflows.

Visit CompressO

Choose ImageOptimizer for browser or API workflows that combine compression, resizing, conversion, metadata controls, and local processing. Its cloud-export options and background removal add practical workflow coverage. Consider another service if your local volume exceeds 100 images per day or you need more than the free API allowance without moving to a paid plan.

Visit ImageOptimizer

The facts

	CompressO	ImageOptimizer
Free plan	Yes	Yes
Open source	Not published	Not published
Runs on	Linux, Mac, Windows	API, Web
Lowest paid plan	Free or on request	Starter: $4.99 a month
Plans published	1	4
Maker	Not published	Not published
Website	compresso.codeforreal.com	imageoptimizer.org
On image compression software	#26 of 85	#22 of 85

CompressO: what it does well

Local processing; files are never uploaded
No account, tracking, or data collection
Batch processing and metadata controls
Supports JPEG, PNG, WebP, GIF, MP4, MOV, AVI
Free and open source under MIT License

What to know first

macOS app is not notarized by Apple
Debian 13 and Ubuntu 24 issue has no solution
Linux, macOS, and Windows are desktop platforms

ImageOptimizer: what it does well

Handles six listed image formats
Batch processing and API access
Local browser processing without server storage
On-device background removal
Exports to Google Drive, Dropbox, and OneDrive

What to know first

Local processing capped at 100 images daily
Free API access limited to five calls daily
SEO naming has monthly plan allowances
Paid plans are billed monthly

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