At first glance
Definition 1 of 1
Pro Tip 1/3Initial Perception
Used to describe a quick opinion formed without deep understanding or analysis. 
At first glance, she seemed unfriendly, but she was actually very kind.
Pro Tip 2/3Possible Change
Implies that your opinion might change after a closer or more extended examination. 
At first glance, the house looked perfect, but upon closer inspection, we noticed many issues.
Pro Tip 3/3Expresses Uncertainty
Indicates that what you are seeing or considering may not be entirely accurate or complete. 
The solution looks simple at first glance, but let's test it to be sure.