Sygic Travel Maps might be a bit more popular than CheapOair. We know about 1 link to it since March 2021 and only 1 link to CheapOair. 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.
The difference is in the airline itself - you booked with KLM you said, through cheapoair.com - did you go to the KLM website and see what that same ticket would cost? The United flight on 'cheapoair' or whatever is going to be comparable to what it is on the website (within a few bucks as someone else stated). 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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