The best alternatives to Rosetta are Morning Reader, GetSocial, and Alethio. If these 3 options don't work for you, we've listed a few more alternatives below.
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AssemblyAI— The most accurate API for conversational speech-to-text
GetSocial is a software as a service solution for mobile apps empowering marketing and product teams with growth tools to maximize user acquisition, engagement, and retention.
Alethio is an advanced blockchain data, analytics, & visualization platform. Alethio's API and Analytics Suite (including ethstats.io) offer a flexible range of options to access and interact with the blockchain data you need, more directly and efficiently.
Chainkit is a new API from PencilDATA for adding Blockchain integrity to regulated and audit-prone data and apps in 5 minutes. Full blockchain abstraction to register() and verify() any data, files, process, messages, or other digital items to prove their integrity. Supports Ethereum and Hyperledger. No smart contracts to learn, no nodes to manage.