AssemblyAI vs OpenWhispr

AssemblyAI provides Voice AI models and APIs for speech-to-text, speech understanding, and voice applications. Its Speech Understanding API can identify and diarize speakers, summarize speech, extract action items and key phrases, detect sentiment, entities, and topics, and handle formatting, language detection, translation, PII redaction, and content moderation. The platform lists support for 99 languages and translation into 86. It offers streaming and voice-agent latency below 300ms and states that it processes more than 800 million API calls per month. Use its managed cloud or self-host models in your own environment; the service also lists API access and integrations including Twilio, Zoom RTMS, Zapier, and LangChain. Security options include TLS 1.2+ in transit, AES-256 at rest, zero data retention, and opting out of model training. A free tier is available. Pay-as-you-go billing is based on usage, with monthly invoices and no minimum commitments. Universal-2 is listed at $0.15 per hour of audio; Universal-3.6 Pro Realtime is $0.45 per hour.

OpenWhispr is an open-source voice-to-text assistant for dictation, transcription, and notes. Dictation works in apps that accept text, including ChatGPT, Claude, Cursor, Google Docs, Gmail, Slack, and Teams. It supports more than 100 languages with automatic language detection. For meetings, it can capture computer audio without joining a call as a bot, then create structured notes with decisions and action items. The note taker works with Zoom, Google Meet, Microsoft Teams, Slack, Discord, Webex, and other apps that play computer audio, without plugins or integrations. Audio can be processed on the device with local speech models or through OpenWhispr Cloud, which says it discards audio without retaining it. The company says user content is not used to train AI models. Free includes 2,000 transcription words per week and five meeting-recording hours per month. Pro costs $6.67/user/mo (annual). OpenWhispr runs on iOS, Linux, macOS, and Windows.