TrainAway might be a bit more popular than Piio. We know about 1 link to it since March 2021 and only 1 link to Piio. 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.
Piio.co — Responsive image optimization and delivery for every website. Free plan for developers and personal websites. Includes free CDN, WebP and Lazy Loading out of the box. - Source: dev.to / almost 3 years ago
Trainaway.fit is probably the closest thing to what you mentioned, as they cover many countries. However, they only sell day passes. I used them a few years ago. Source: almost 2 years ago
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