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DeepSpeech
C++2017–2026
mozilla / DeepSpeech · Archived

DeepSpeech

DeepSpeech is an open source embedded (offline, on-device) speech-to-text engine which can run in real time on devices ranging from a Raspberry Pi 4 to high power GPU servers.

69Distinct people
79Mentions
0Explicit recommenders
26.8KGitHub stars
REPOSITORY AT A GLANCE

What to know before exploring

What it is

DeepSpeech is an open source embedded (offline, on-device) speech-to-text engine which can run in real time on devices ranging from a Raspberry Pi 4 to high power GPU servers.

GitHub

Where it is used

The last source check was inconclusive. This does not establish whether a product uses it.

What people are saying

No recommendation phrase was found in the indexed comments.

No classified warning is attached to this page. Read the discussions before treating silence as approval.

Also in these discussions

Mentioned in the same Hacker News threads. That is not proof they are substitutes.

This week on Hacker News

Nov 7–Nov 14 UTC · Direct repository links and separately labeled related project stories. Indexed through 11/14/2026, 7:02:50 PM UTC.

No direct repository links were found in the indexed HN discussions over the past seven days. Older discussions are available below.

Mentions over time

HN mentions by year79 dated mentions

Observed mentions: 2017-03-11 19:44:59 UTC to 2026-10-02 16:14:38 UTC.

051015202017-01-01 00:00:00 UTC to 2018-01-01 00:00:00 UTC (exclusive): 19 mentions; 4 submissions, 15 comments20172018-01-01 00:00:00 UTC to 2019-01-01 00:00:00 UTC (exclusive): 11 mentions; 1 submissions, 10 comments2019-01-01 00:00:00 UTC to 2020-01-01 00:00:00 UTC (exclusive): 16 mentions; 0 submissions, 16 comments2020-01-01 00:00:00 UTC to 2021-01-01 00:00:00 UTC (exclusive): 14 mentions; 2 submissions, 12 comments2021-01-01 00:00:00 UTC to 2022-01-01 00:00:00 UTC (exclusive): 8 mentions; 0 submissions, 8 comments20212022-01-01 00:00:00 UTC to 2023-01-01 00:00:00 UTC (exclusive): 4 mentions; 0 submissions, 4 comments2023-01-01 00:00:00 UTC to 2024-01-01 00:00:00 UTC (exclusive): 4 mentions; 0 submissions, 4 comments2024-01-01 00:00:00 UTC to 2025-01-01 00:00:00 UTC (exclusive): 1 mentions; 0 submissions, 1 comments2025-01-01 00:00:00 UTC to 2026-01-01 00:00:00 UTC (exclusive): 1 mentions; 1 submissions, 0 comments2026-01-01 00:00:00 UTC to 2027-01-01 00:00:00 UTC (exclusive): 1 mentions; 0 submissions, 1 comments. Incomplete calendar period.2026*

* An incomplete calendar period is marked with an outlined bar. Its count is not directly comparable with a full period.

Counts come from the repository’s dated source evidence. Index cutoff: 2026-11-02 08:16:59 UTC.

View mention counts and date ranges
UTC ranges include their start and exclude their end. Select a period to filter the source evidence.
PeriodStart (UTC)End (exclusive, UTC)MentionsSubmissionsComments
20172017-01-01 00:00:00 UTC2018-01-01 00:00:00 UTC19415
20182018-01-01 00:00:00 UTC2019-01-01 00:00:00 UTC11110
20192019-01-01 00:00:00 UTC2020-01-01 00:00:00 UTC16016
20202020-01-01 00:00:00 UTC2021-01-01 00:00:00 UTC14212
20212021-01-01 00:00:00 UTC2022-01-01 00:00:00 UTC808
20222022-01-01 00:00:00 UTC2023-01-01 00:00:00 UTC404
20232023-01-01 00:00:00 UTC2024-01-01 00:00:00 UTC404
20242024-01-01 00:00:00 UTC2025-01-01 00:00:00 UTC101
20252025-01-01 00:00:00 UTC2026-01-01 00:00:00 UTC110
2026 (partial)2026-01-01 00:00:00 UTC2027-01-01 00:00:00 UTC101

What Hacker News says

19 sources
Added an enhancement request, issue 1064[1], to github, asking for the clients to support longer audio clips. I can't promise when we'll get to it, as from now until new year is a bit of a wash. I don't know of any detailed comparisons of commercial solutions. However, with respect to pure word error rate, the article[2] does a comparison of several engines as of circa 2015. [1] https://github.com/mozilla/DeepSpeech/issues/1064 [2] https://arxiv.org/abs/1412.5567
In A TensorFlow implementation of Baidu's DeepSpeech architecture
Some more information in the official blog post: https://blog.mozilla.org/blog/2017/08/01/new-test-pilot-expe... I was especially interested in the Voice Fill (speech recognition) technology. Landing page: https://testpilot.firefox.com/experiments/voice-fill It seems the project is here: https://github.com/mozilla/speaktome/ This seems as if it actually is a webservice. From the code (https://github.com/mozilla/speaktome/blob/master/extension/c...), I see: const STT_SERVER_URL = "https://speaktome.services.mozilla.com"; Actually, I think this can be very easily done fully client-side, with good accuracy. Even on Android, the voice recognition can run client-side / offline. I wonder if the project is in any way related to their DeepSpeech project (https://github.com/mozilla/DeepSpeech). Maybe they use DeepSpeech on the server-side? At some
Read the rest
other place they call it Pipsqueak, not sure if this is yet something else. And maybe also related is their common voice project (https://voice.mozilla.org/). Recent discussion here on HN (https://news.ycombinator.com/item?id=14794654). Some more information also here: https://research.mozilla.org/machine-learning/
In Mozilla launches voice search, file-sharing and note-taking tools for Firefox
Common Voice is only about collecting a large public database of voices. We do have a separate project around speech-to-text [1]. We haven't done much work around speaker recognition (AFAIK) or voice synthesis, but they are both very interesting both from a technical and privacy related standpoint. That said, both are out of the scope of Common Voice (which is only about the data). 1.) https://github.com/mozilla/DeepSpeech
In Project Common Voice
I can tell from your comment (and it's responses) that the language on our homepage is a bit confusing, so thank you for the feedback. To answer you question: Common Voice is about building a collection of labelled voice data (ie. sentence clips w/ transcripts) that can be used to, for instance, train speech-to-text algorithms. Part of the goals of this project though is to figure out how this data can best help people build voice technology. So it's pretty open ended at this point. Mozilla does have an open source speech-to-text engine [1] we are developing, and we hope one day to use the Common Voice data to train this engine. DeepSpeech and Common Voice are related, but separate projects, if that makes sense. As for LibriSpeech, the DeepSpeech team at Mozilla does use this data for training. However, the language is pretty antiquated,
Read the rest
and we only get about 1K hours of data, whereas you need about 10K hours to get to a decent accuracy (WER of 10% and below). Common Voice is about adding to public corpora like LibraSpeech, not replacing them. 1.) https://github.com/mozilla/DeepSpeech
In Project Common Voice
1. If you can pay for around 24.6 hours of VA speech data, you can get enough data to run this process with the same quality that Google presented. (that's from the "Experiments section") Not cheap (definitely not free, especially considering the amount of quality control you have to apply), but not expensive either. 2. You can rent out a 96GB GDDR5 GPU instance from Google's cloud for pretty cheap. (https://cloud.google.com/compute/docs/gpus/) I don't think you need anything more powerful than that (but feel free to prove me wrong). I think your last paragraph is totally misguided/uninformed. You can download models for cheap/free (for non-commercial/edu use) from UPenn (https://www.ldc.upenn.edu/language-resources/data/obtaining). People don't give away models for free with 0 strings attached because they're a pain to make. And if you w
Read the rest
ant something you can run on a home computer for cheap/free, you can try DeepSpeech: https://github.com/mozilla/DeepSpeech. All you need is an Nvidia GPU.
In Tacotron: A Fully End-to-End Text-To-Speech Synthesis Model

Showing the 15 most recent of 19 sources. Enable JavaScript to search and browse every indexed mention.

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