SEO Audit + Image Compression
SEO Audit, Check Store Site Health Issues & Image compression
Seamless workflow: use directly in Shopify admin
Up-to-date tech: works with the latest themes
Speed tested: low impact to your online store
Giving this a 3 because it did what it said, but...
At the beginning it asks you to decide between lossless (less compression) and lossy (more compression), and warns you that choosing lossy may result in more distortion. Then, after they warn you that it might cause this distortion you don't get to see what changes were made to your images, you're just supposed to trust they didn't ruin anything and publish them sight unseen.
There is no option to restore all of the images at once if you aren't happy with the results, you have to go through your site and handle them one at a time. Other apps offer a restore option.
Also, there doesn't appear to be a good way to contact the company.