AssemblyAI vs Openwhispr

OpenWhispr focuses on dictation with local AI models (Whisper Tiny to Turbo, NVIDIA Parakeet/Nemotron) and cloud transcription via BYOK for providers like OpenAI, Claude, and Gemini. It includes an AI Notepad for meeting notes with speaker labels, an AI Chat that knows your meetings, and snippets for text expansion. Recent v1.7.6 adds translation, audio import from URLs, GPU support for AMD/Intel, and live streaming. AssemblyAI is an API-first platform with pre-recorded and real-time speech-to-text (Universal-3.5 Pro at 18 languages, Universal-2 at 99), plus a Voice Agent API with built-in turn detection and interruption handling. Its Speech Understanding API extracts speaker ID, sentiment, chapters, and summaries from a single call. The new Sync API returns transcripts in one call (~134 ms latency). AssemblyAI's latest Universal-3.5 Pro Realtime achieves human parity on the Coval benchmark. OpenWhispr offers an interactive AI Chat that references meeting context; AssemblyAI does not have a built-in chat, but provides an LLM Gateway for routing to GPT, Claude, or Gemini. OpenWhispr supports a custom dictionary synced across devices; AssemblyAI offers Keyterms Prompting for term accuracy. For integrations, OpenWhispr connects to local and cloud AI providers, while AssemblyAI integrates with Pipecat, ElevenLabs, Zoom, Siro, and LiveKit. Both support speaker detection, but AssemblyAI's diarization is API-based with sentiment and chapters.

OpenWhispr is freemium: the free tier allows 2,000 words per week of cloud transcription. Paid plans (Pro and Business) remove limits and add features like AI Chat and AI Notepad. You can also use your own API keys (BYOK) to avoid per-word costs. AssemblyAI offers 100 minutes free for pre-recorded or real-time. Beyond that, Universal-3.5 Pro costs $0.21 per hour, and Universal-2 costs $0.15 per hour. The Voice Agent API and Speech Understanding features are priced per additional usage. AssemblyAI's pricing is usage-based and scales with volume, while OpenWhispr's paid plans are fixed monthly or annual subscriptions. For heavy dictation, OpenWhispr's subscription may be more predictable; for occasional API calls, AssemblyAI's free tier and per-second billing might be cheaper. OpenWhispr does not charge for local transcription (runs on your GPU/CPU). AssemblyAI has no local option, so internet and cloud costs always apply.