Tynker might be a bit more popular than Spoj. We know about 1 link to it since March 2021 and only 1 link to Spoj. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Have you looked at spoj.com? It has a fair amount of different problems, some of them are pretty creative, you can take an inspiration from that. Source: about 3 years ago
Scratch is coding for kids. tynker.com is scratch but with an actual curriculum and it's paid. I'm looking to make an open source project that will be tynker but completely free, to encourage coding among kids. Any type of developer will do, front-end, back-end, app developers, designers, they are all welcome. If you are interested dm ! Apple (~~$~~)#1899 on discord or contact me at cuberlouis@gmail.com. Source: almost 3 years ago
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