When comparing uTandem vs Speaky, the Slant community recommends Speaky for most people. In the question“What are the best language exchange apps for Android?” Speaky is ranked 7th while uTandem is ranked 8th.
Ranked in these QuestionsQuestion Ranking
Pros
Pro Meet people in your area
Connects you with people in your area who are fluent in the language you're learning, so you can practice in person. The app also tells you about language exchange events in your area.
Cons
Con Small community
It can be difficult to find chat partners due to the small size of the community.
Con App crashes everytime you correct a message
Con Many scammers
Be careful as there are many false profiles trying to get romance. It may even take 1 year, they'll wait to get your trust in them ask money and got photos of you. So beware of scammers and do not share photos or video or send money with somebody that you don't know in real life