Caesium Image Compressor vs Fastly Image Optimizer
Caesium Image Compressor
saerasoft.comFastly Image Optimizer
fastly.comSide by side
| Figure | Caesium Image Compressor | Fastly Image Optimizer |
|---|---|---|
| Price from | Free | $0.01/mo |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | — | — |
| Web | Yes | Yes |
| Windows | Yes | — |
| macOS | Yes | — |
| Linux | Yes | Yes |
| API | — | Yes |
| Plans published | 1 | 8 |
| Spec score · Image Compression Software | 8.5 (#13) | 8.5 (#12) |
| Purpose | Caesium compresses digital pictures for storing, sending and sharing, and is aimed at photographers, bloggers, webmasters, businesses and casual users. | Fastly Image Optimizer automates image optimization for image-heavy sites and apps. |
Plans
Fastly Image Optimizer
- Image Optimizer — 0–100,000 image requestsFree
- Image Optimizer — Beyond 5 Billion image requests$0.01 a month
- Image Optimizer — 1 Billion–5 Billion image requests$0.02 a month
- Image Optimizer — 500 Million–1 Billion image requests$0.02 a month
- Image Optimizer — 150 Million–500 Million image requests$0.03 a month
- Image Optimizer — 50 Million–150 Million image requests$0.07 a month
- Image Optimizer — 10 Million–50 Million image requests$0.15 a month
- Image Optimizer — 100,000–10 Million image requests$0.50 a month
In their own words
Caesium Image Compressor
Caesium Image Compressor reduces digital pictures for storage, sending, and sharing, with desktop and online options. The maker says compression can reach 90% without visible quality loss. Desktop tools include a real-time preview, batch processing, resizing, metadata storage options, and folder structure support. Supported formats are JPG, PNG, WebP, and TIFF; both compression modes are available. The online compressor works without a dedicated download, states images never leave your device, and offers a lossless mode that preserves image quality completely. It accepts up to 10 files at once, with a 20 MB limit per file. Caesium also provides command-line tools for image compression. The free software is listed for Linux, macOS, web, and Windows. The current Windows desktop version is v2.8.5 for Windows 10 build 1809 or later, with installer and portable downloads. The macOS version supports macOS 12 or later. Linux users can compile the source or obtain a third-party build; the project README reports testing on Ubuntu 22.04 and Manjaro.
Fastly Image Optimizer
Fastly Image Optimizer automates image processing and delivery for image-heavy sites and apps. It resizes, adjusts quality, crops or trims, changes orientation, converts formats, and serves images on demand at the edge. Transformations are made in real time from request parameters, avoiding the need to pre-generate and store multiple variants. Processed images are cached for reuse. Supported formats are WebP, AVIF, JPEG, and PNG; developers control resizing, quality, format, and cropping through query parameters and configuration. The service integrates with existing asset pipelines and CMS platforms while teams keep their current image sources. It can be enabled through the Fastly control panel or API, while Compute SDK access is available through a beta program. Pricing includes 100,000 image requests per month at free. Paid rates are billed per 10,000 image requests and vary by monthly volume, from $0.50 a month for 100,000–10 million requests to $0.01 a month beyond 5 billion. Every request sent to Image Optimizer, including through the SDK, counts as billable.