On the surface
Definition 1 of 2
Pro Tip 1/3Misleading Appearances
The phrase suggests that the initial impression might hide the truth or deeper realities. 
He seemed happy on the surface, but was actually struggling.
Pro Tip 2/3Quick Judgement
Indicates a superficial assessment not based on detailed analysis. 
On the surface, the problem looked simple.
Pro Tip 3/3Deceptive Simplicity
Something might look straightforward at first glance but could be complex underneath. 
The plan looks good on the surface.