When comparing Alto's Adventure vs Duet, the Slant community recommends Alto's Adventure for most people. In the question“What are the best offline Android games?” Alto's Adventure is ranked 5th while Duet is ranked 16th. The most important reason people chose Alto's Adventure is:
A purchase of the iOS version of Alto's Adventure also entitles the buyer to a free modified Apple TV-version, optimized for the Apple TV controller and large screens.
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Pros
Pro Also playable on Apple TV
A purchase of the iOS version of Alto's Adventure also entitles the buyer to a free modified Apple TV-version, optimized for the Apple TV controller and large screens.
Pro Relaxing gameplay that lends itself well to repeat plays
Between the pleasant graphics, soothing music and fun gameplay, the game allows itself to be relaxing yet still remain challenging. You never get a sense that the game is too tough, which is why the player can easily jump back into play no matter how many times they fall off the board.
Pro Can be played offline
Duet does not require an internet connection for the game to be played, making it an ideal game to play when there is no internet connection available.
Pro Simple yet interesting graphics
At a first glance, the graphics of Duet appear rather simplistic, but on closer inspection one notices how much detail there is, from the moving background to the high resolution support.
Pro Can be played in the player's preferred orientation
Whether the player prefers playing in portrait view or landscape Duet supports it.
Pro Supports immersive mode
Duet supports immersive mode on Android devices that are on 4.4+ (KitKat or above). Immersive Mode allows you to 'hide' the on-screen navigation buttons and the top status bar in order to get a full screen experience.
Pro Excellent soundtrack
The soundtrack for Duet was created by composer Tim Shiel and matches the game graphics perfectly.
Cons
Con Standard endless runner mechanics
While Alto's Adventure isn't particularly difficult or challenging to play, the game doesn't offer unique gameplay mechanics but instead uses traditional endless runner mechanics that are present in dozens of other apps. As a result, gameplay in Alto's Adventure might come off as a bit dull.
Con Paid app on iOS, free to play on Android
The monetization of Alto's Adventure is treated quite differently on both ecosystems. On iOS, Alto's Adventure is a premium application with a price tag of $2.99 upfront and no in-app purchases or advertisements. On Android however, the developers have opted to go for a free-to-play route with video ads and a microtransaction for doubling the amount of coins you receive. Depending on your platform and preferences, you might prefer a premium or a free-to-pay app over the other.
Con Extremely difficult
Even though the levels are only 20 seconds long, the difficulty of each level is so high that it takes several attempts before a stage is completed.