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OpenSubs vs Alt Text Generator

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

OpenSubs compared with Alt Text Generator
DetailOpenSubs logo OpenSubsAlt Text Generator logo Alt Text Generator
What it doesFree AI subtitle generator that runs entirely in your browser AI-powered alternative text generation for images that meets WCAG and SEO requirements
StageNot given Not given
FoundedNot given Not given
Based inNot given PL
Pricing modelNot given Freemium
PricingFree: transcription, translation on-device, all 12 subtitle styles, word-by-word highlighting, trimming, burning into video, and all export formats. Credits: $5 for 1,000 credits for cloud translation (approximately 1 credit per 30 subtitle lines). Free plan: up to 10 images per day on one site. Premium plans available for unlimited automation and API access.
Key features
  • Speech recognition in the browser using Whisper
  • Translation to 20 languages including Chinese, Japanese, Korean, Spanish, Portuguese, French, German, Italian, Russian, Arabic, Hindi, Indonesian, Thai, Vietnamese, Turkish, Polish, Dutch and Ukrainia
  • Burn subtitles into MP4 without watermark
  • Export to SRT, VTT, ASS and TXT formats
  • Live subtitles over video playing in browser tabs via extension
  • Support for multiple video formats including MP4, MOV, WebM and MKV
  • No server processing—all work runs locally on user's machine
  • Upload and process images in browser (up to 5 files, 10MB each)
  • Add optional context for AI to tailor descriptions
  • API for custom integration
  • Automatic context-aware generation using page content and headings
  • Handles existing images and automatically finds those without descriptions
  • Edit and manage generated descriptions from account
  • Scales for large websites with hundreds or thousands of images
  • No impact on website performance or page load speed
  • Improves search engine indexing of images
What makes it different
  • 100% browser-based with no uploads—the video never leaves your machine
  • Completely open source under AGPL-3.0-or-later so you can verify the code
  • Free forever for transcription, styling and burning—pay only for optional cloud translation
  • No watermark, no file-size limit, no queue, and no account needed to try
  • No CMS changes required - works with automatic script installation
  • Context-aware AI generation that considers surrounding content for accuracy
  • Free version with no time limit, only usage caps
  • Meets both WCAG accessibility and SEO requirements simultaneously
  • Multiple deployment options: browser tool, plugins, API or automatic script
Free planNot given Not given
Open sourceNot given Not given
PlatformsNot given Not given
Public APINot given Not given
Community votes00
DR (Domain Rating by Ahrefs)34 −1 (down) since last check47 +1 (up) since last check
Trust Flow (Majestic)1014
Citation Flow (Majestic)3015
Referring domains (Majestic)9640

4 details filled in for both companies.

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