Good map poor guide (Hanoi)
Honestly I would pay for the offline map alone. Which is good. Because if you're expecting a decent guide you'd be wrong. Material is gleaned off social media and Wikipedia. Images are wrong and recommendations are often tourist traps. If you can't write a decent guide, integrate with trip advisor. And if the map is your big selling point please update t to include at least the minimum attractions. Hope the other cities are better because Hanoi was deeply disappointing.