Fire Emblem Heroes is a free-to-play game that lets players spend real money inside the app once they download it. Most of Nintendo's apps have followed this structure, except Super Mario Run, which requires players to pay $9.99 to see the full game. In total, Fire Emblem Heroes has brought in "more than seven times the revenue" of Super Mario Run, and grossed more than twice the combined earnings of all of Nintendo's other mobile games, according to Sensor Tower.
To date these include Miitomo (now defunct), Super Mario Run, Animal Crossing: Pocket Camp, and Dragalia Lost. Released just last September, Dragalia Lost has already become Nintendo's second most lucrative mobile game, surpassing Animal Crossing: Pocket Camp and Super Mario Run.
In terms of platforms for Fire Emblem Heroes, players on Google Play/Android accounted for the majority of spending at 54 percent, while the iOS App Store made up 46 percent of player spending. Most players are located in Japan, which accounted for 56 percent of the game's $500 million total, while the United States is the game's second largest market at 31 percent of player spending.
Despite Super Mario Run performing poorly in comparison to the free-to-play games, Shigeru Miyamoto has stated that Nintendo will "continue pushing" for pay-once mobile games over freemium experiences. One senior official at Nintendo called the F2P structure of Fire Emblem Heroes as "an outlier" in the grand scheme of Nintendo's mobile strategy, claiming that Nintendo "prefers" Super Mario Run's payment model.
Despite this, Nintendo's next two mobile game releases will be free-to-play: Mario Kart Tour will launch this summer and Dr. Mario World is set to release later in 2019.