Adopt Me works because it stacks three loops on top of each other: you collect pets, you trade them with other players, and you decorate a home and roleplay a life around it. Most people who search for something like it are really chasing one of those loops in particular. Here are the games that do each one well.
For collecting pets
If the pets are the point, the simulator side of Roblox is built for you. Pet Simulator 99 and Pet Simulator X turn pet collecting into the whole game, with huge rosters, rarities to hunt, and a hatching loop that keeps giving you a reason to come back. Bee Swarm Simulator is a gentler cousin: you raise a swarm instead of a menagerie, but the collect-and-upgrade rhythm feels familiar.
For trading and chasing value
Half the fun of Adopt Me is watching what your pets are worth and dealing with other players. Grow a Garden has a strong trading and value culture around rare produce and mutations, and it moves fast enough that the market always feels alive. If you like the social side of haggling more than the pets themselves, this is the closest match. A fair warning that applies everywhere: keep trades inside the game, and ignore anyone offering off-platform deals or free currency, since those are scams.
For roleplay and family life
Take away the pets and Adopt Me is a life-sim town, and Roblox has plenty of those. Brookhaven RP is the default hangout where you can play a family, drive around, and make the world your own. Livetopia and Berry Avenue lean harder into detailed roleplay with homes, vehicles, and jobs, and MeepCity is the long-running classic that started this whole lane.
For decorating and dressing up
If your favorite part was styling your character and home, Royale High turns collecting outfits and accessories into the main grind, and Dress to Impress is a quick, social styling game you can jump into with friends.
How to pick
Decide which Adopt Me loop you actually miss. If it is the pets, start with the two Pet Simulators. If it is the trading, try Grow a Garden. If it is the roleplay, Brookhaven and Berry Avenue are the fastest way in. Every game above opens to a page with similar titles, so you can keep pulling the thread. To browse the wider field, the roleplay and simulator genre pages are good next stops, and Find games like your favorites covers the same idea for other games.