Most image compressors charge per image. That is a pricing model which punishes the customer for using the product. The more useful the tool becomes to a team, the more it costs them, and the sensible response is to use it less. A tool nobody wants to run is not worth paying for.
This one charges a flat monthly price. Pro is $12 a month and includes 10,000 images. Ten thousand images or one, the bill is the same. There is no per-image fee on any plan, at any volume, and no surcharge for the API. Costs that are predictable at the start of the month are the only kind worth budgeting for.
The free tier is the same idea taken seriously. It allows images up to 25 MB and batches of 30, which is well above what the metered incumbents permit before asking for a card. It is not a demo with the useful parts removed.
Flat
No per-image fee
Every plan is one monthly price. Volume changes nothing about the invoice.
25 MB
Free per-image limit
With 100 images a month on a free account, and 30 in a single batch.
One config
Free and paid, same code
The free limits are read from the same configuration the paid tiers use, so the page cannot advertise a cap the server does not enforce.