You searched a paid product
Otter.ai does 3 jobs: meeting transcription, speaker identification, meeting summaries. Most projects replace one or two of them, so pick the job you actually need.
Open-source alternatives to Otter.ai that run locally, allow commercial use and need no paid API include whisper.cpp (meeting transcription; MIT; runs on CPU). FluidVoice and Scriberr cover all 3 Otter.ai jobs.
Reimplementation of OpenAI Whisper on CTranslate2, up to 4x faster with less memory, with int8 on CPU or GPU.
On-device voice dictation app for macOS that also records meetings (FluidMeet) with live captions, speaker labels and transcripts.
Local AI meeting assistant that records mic and system audio, transcribes live with Whisper or Parakeet and summarises with an LLM.
Self-hosted web app for offline transcription with Whisper, Parakeet or Canary, speaker diarization and LLM summaries.
Dependency-free C/C++ port of OpenAI's Whisper speech recognition, running on CPU or GPU across desktop, mobile and the browser.
OpenAI's general-purpose speech recognition model for multilingual transcription, translation to English and language ID.
Fast batched Whisper transcription with word-level timestamps via wav2vec2 alignment and pyannote speaker diarization.
No project meets all of your requirements. The list below shows what you'd need to relax.
We hid them because something is missing, unknown or conflicting. Here's what.
Yes. FluidVoice, Scriberr, WhisperX, Meetily and whisper.cpp are free to download and run on your own computer without paid API keys. FluidVoice and Scriberr cover every job we list for Otter.ai; the others cover only part of it, so check which job you need.
Yes, with whisper.cpp (MIT), faster-whisper (MIT) and WhisperX (BSD-2-Clause). Check the hardware notes and licence conditions on each page before you start.
Yes, with FluidVoice (GPL-3.0), WhisperX (BSD-2-Clause) and Scriberr (MIT). Check the hardware notes and licence conditions on each page before you start.
Confirmed: faster-whisper, Meetily, Scriberr, whisper.cpp and Whisper. With conditions: FluidVoice and WhisperX. This is not legal advice; read each licence.
FluidVoice and Scriberr cover every job we list for Otter.ai.