Find the quietest time to visit before you leave
The gym at six is a queue. The same gym ninety minutes later is empty, and nothing on your phone volunteers that.
Feature comparison
Key Insights
Popular times data exists inside the mapping apps, buried under directions. FullHouse makes that the whole question and answers it first.
The short version
All of these can tell you how busy a place is, and only one is designed around the question. FullHouse asks when to go and answers with the quiet window. Google Maps holds the same popular times data behind a search result, a scroll and a tap, which is fine once and tedious as a habit. BestTime.app sells foot traffic forecasting to businesses through an API. It is aimed at analysts rather than someone deciding when to leave the house. Foursquare is a venue database with crowd signals attached, and its consumer app has faded.
What actually separates them
The difference is what the tool is arranged around. FullHouse treats the quiet window as the answer, so the interface leads with timing rather than with directions or reviews. The mapping apps treat busyness as one attribute of a place among dozens, which means the information is present but never volunteered. For a business forecasting staffing, an API like BestTime is the right shape. For a person deciding whether to go now or after lunch, an app that opens on the answer wins.
What you get free
FullHouse is free to use for the question it answers. Google Maps is free and always has been, with the popular times data included. BestTime.app is a paid API with a small trial allowance, since its customers are businesses. Foursquare's developer tier is free up to a request limit, which is a developer allowance rather than a consumer plan.
Strengths and weaknesses
Verdict

Timing is Everything

FullHouse wins for anyone planning a trip around avoiding crowds rather than around opening hours.
Who should pick what
Someone deciding when to visit a gym, a cafe or a shop should use FullHouse and go at the quiet hour. A person who needs directions and reviews in the same place should stay in Google Maps. A business planning staffing around foot traffic should buy BestTime.app. A developer building venue features into an app should look at Foursquare's API.
Absolute beast