I'd recommend avoiding "services" and going for books, starting with graded readers. There's a wealth of options for Spanish learners.

If you absolutely hate books and want an online resource, then I'd suggest https://www.lingq.com. It has a lot of free content and lets you import your own. Their tech/design chops are meh, but it's run by true language learning enthusiasts and the founder dogfooded it for at least half a dozen languages.