asub
asub: An open-source desktop tool for batch transcription and subtitle translation. Ranked #47 of 99 in AI Video Caption Generators by our editors (3.0/10); pricing: Free plan; best for technical users wanting free batch subtitle generation.
At a glance
- Editor score3.0 / 10
- PricingFree plan
- Best forTechnical users wanting free batch subtitle generation
- Free planYes
- Paid fromFree
- Facts checked22 Sep 2026
Where it wins
- Batch-process folders and export SRT or WebVTT subtitles.
- Translate subtitles to 100+ languages and optionally label speakers.
- Run locally on CPU or GPU across Windows, macOS and Linux.
Where it doesn't
- Command-line workflows require comfort with Python or terminal tools.
- The project is marked Beta.
- Visual caption styling and burned-in video output are not documented.
Our verdict on asub
For technical users who want to generate subtitles locally, asub is an open-source command-line tool for transcribing audio and video. It uses faster-whisper, detects the source language automatically or lets users select it manually, and processes individual files or folders. Its desktop and self-hosted approach suits solo users and small workflows comfortable with Python or command-line tools; it is less suited to buyers seeking a visual editor for caption styling.
Batch processing and translation are central strengths. asub can translate subtitles to 100+ languages through Google Translate, and optional WhisperX-based diarization adds anonymous speaker labels. Voice Activity Detection filtering is also available. Output formats are SRT and WebVTT, so the workflow produces subtitle files rather than documented rendered captions. CPU and GPU execution, quantization options, and Windows executable packaging provide different ways to run the tool; it is available for Windows, macOS, and Linux. Hugging Face is also listed among its integrations.
There are no paid tiers described: asub is open source and has a free plan. The project is marked Beta, and its documentation does not describe maximum video duration, visual caption styling, burn-in rendering, or brand caption presets. That makes it a reasonable fit for technically capable users who need local batch transcription, translation, and subtitle exports, but a weaker choice for teams that want polished on-video captions or a guided interface. Buyers who need those editing capabilities should look for a tool that explicitly provides them.
Your product? Our editors can test asub in depth and publish a review, labelled as paid · from $149/mo →
asub pricing
asub fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Max video length | Not verified |
| Caption languages | Not verified |
| Caption styling | Not verified |
| Subtitle export | Srt and vtt |
| Burn-in captions | Not verified |
| Speaker identification | Yes |
| Brand caption presets | Not verified |
| Deployment | Self-hosted, Desktop |
| Platforms | Windows, macOS, Linux |
| Support | Docs |
| Built for | Solo, Small business (editorial estimate) |
| Integrations | 2 integrations: Google Translate, Hugging Face |
| Pricing | Free plan |
| Website | github.com |
| Facts checked | 22 Sep 2026 |
asub integrations
asub lists 2 integrations on its own site.
- Google Translate
- Hugging Face
Alternatives to asub
- WhisperA flexible local transcription engine, but not a complete caption-editing product.9.2
- CaptionHubA workflow-rich caption and localization platform for enterprise video teams.8.8
- SubmagicAn all-in-one caption editor with styling, text editing, B-roll, and publishing tools.8.7
Used asub? Be the first to review it
The editor score above is our own research. What this page doesn't have yet is a reader's view — what you used asub for, what worked and what didn't. No stars are seeded and no review is paid for; an editor reads every one before it appears.
Write a reviewTwo minutes · verified accounts only · read by an editor before it appears
Featured on iTechGuides
asub is listed in our AI Video Caption Generators directory. Add the badge to your site — it links back to this page.
<a href="https://www.itechguides.com/products/asub/"><img src="https://www.itechguides.com/best/badge/asub.svg" alt="Featured on iTechGuides" width="230" height="46"></a>
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.
Last updated · How we research and update