The single structural difference behind most of these comparisons is where the file goes. Aihangsoft's 28 local tools read the file from your disk and write the result back to your disk, using WebAssembly modules such as ffmpeg, qpdf, pdf-lib and tesseract.js. There is no upload step, which is why there are no daily task counters and no file size ceilings tied to bandwidth.
The server-based tools compared here are not doing anything wrong. Uploading is a reasonable design, and it is the only way to offer features such as Office document rendering or a conversion API. The trade is that the service has to ration CPU and bandwidth, which is where free-tier limits come from.
Where a competitor's price or limit is quoted on these pages, it comes from that company's own pricing or help pages as of the date shown. Prices change, and several of these services render different prices by region, so treat the numbers as a starting point and check the current page before you decide.
Four of our tools are the exception to the local model: background removal, object erasing, image enhancement and vocal separation run on a server and consume credits. They are not part of these comparisons, and each of those pages says so before you start a job.