Based on our record, ZenHotels should be more popular than Sygic Travel Maps. It has been mentiond 2 times since March 2021. 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.
Not sure about the invitation though. I heard that now border controls are sticter than before - but for business visas. Anyway, for peace of mind, if you want to book a hotel from Europe, you can use zenhotels.com. Source: 5 months ago
I made a hotel reservation from zenhotels.com about 4 months ago. I decided to call the hotel to make sure my reservation was confirmed just to be safe, and they told me my reservation was cancelled, even though I did not cancel it and it says its still active on the zenhotel website. So lesson learned, nothing is guaranteed. Hopefully this will save someone some headache like I just went through. Source: about 2 years ago
I've been using Sygic Travel from the Czech Republic and really like it. It doesn't use Google Maps, but you just press the location on the map, click add, then it autosorts to give you an optimized itinerary (like yours does) and spits out the itinerary. I think your biggest issue is being cost competitive. I paid $7.99 once for Sygic Premium (I think it's $9.99 now), so $19.99/month is an entire tier higher in... Source: almost 2 years ago
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