| Price from | $49/mo | $3.25/mo |
| Free plan | — | Yes |
| Free trial | Yes | — |
| Open source | — | — |
| Web | Yes | Yes |
| macOS | Yes | — |
| iOS | Yes | — |
| API | Yes | — |
| Plans published | 4 | 7 |
| Spec score · Image Compression Software | 8.9 (#6) | 8.3 (#27) |
| Batch processing | Users can add hundreds of files or entire folders for parallel processing with progress tracking. | Yes |
| Compression | The site says Compresto can reduce file sizes by up to 90% while preserving visual quality. | It targets lossless compression for PNG images and slight lossy compression for JPEG images while maintaining their visible appearance. |
| Formats | It supports MP4, MOV and other major video codecs; PNG, JPEG, HEIC, WebP, TIFF and GIF images; and standard PDFs. | Optimus can generate progressive JPEGs, and the paid HQ plans include WebP conversion. |
| Free plan | No | Yes |
| Maker | The site footer credits Dinh Quang Hieu; the pages opened did not state a headquarters or founding year. | The site’s imprint identifies proinity GmbH and lists Switzerland as its country. |
| Privacy | The maker says selected files are processed locally and are not uploaded, stored or accessed after compression. | Images are sent to Optimus servers for processing, and the service says it immediately deletes each file after compression. |
