DeepSpeech

Mozilla's DeepSpeech is an open-source speech-to-text engine based on the architecture described in Baidu's Deep Speech research paper and implemented in TensorFlow. It converts audio to text entirely on-device with no cloud dependency, supports real-time streaming transcription, and runs on hardware ranging from a Raspberry Pi 4 to GPU servers, which made it a popular choice for privacy-preserving and embedded voice applications. Pretrained English models were distributed alongside tooling for training custom models on new languages and acoustic conditions. Development has ended: Mozilla archived the repository in June 2025, making it read-only, so no further updates or fixes should be expected, though the code remains usable under the MPL 2.0 license. It is still referenced by developers studying end-to-end speech recognition or maintaining legacy offline transcription systems.