One of the most powerful is AssemblyAI. The service offers full speech-to-text abilities, including speaker identification, sentiment analysis and support for more than 99 languages. It's got flexible integration tools and different pricing levels, too, so it's good for developers who need to process voice data in many different ways.
Another good option is Gladia, which uses Whisper ASR technology for high-accuracy transcription and speaker diarization. Gladia supports multilingual speech-to-text and has features like code-switching and word-level timestamps, so it's good for virtual meetings and collaboration in the workplace.
If you need transcripts that are fast, accurate and contextualized, WavoAI offers a sophisticated audio transcription system. It includes speaker identification and interactive AI insights like summaries and To-Do lists, and is designed to fit in with tools and workflows you already use, so it can help you work more efficiently in a variety of fields.