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OpenSubs vs Sonix

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 Sonix
DetailOpenSubs logo OpenSubsSonix logo Sonix
What it doesFree AI subtitle generator that runs entirely in your browser AI transcription and translation platform that converts audio and video to text with 99% accuracy in 54+ languages
StageNot given Established
FoundedNot given 2017
Based inNot given US
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). Pay as You Go: $10/hour; Core: $25/month or $275/year (5 hours/month transcription, 5 hours/month AI analysis, 25 GB storage); Advanced: $50/month or $550/year (20 hours/month transcription, 25 hours/month AI analysis, 50 GB storage); Pro: $80/month or $880/year (40 hours/month transcription, 100 ho
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
  • 99% transcription accuracy in 54+ languages
  • Speaker diarization with automatic speaker identification
  • AI-powered summaries, chapters, and sentiment analysis
  • Automated subtitles and captions with multiple export formats
  • In-browser audio and text editor with word-level timestamps
  • Full-text search across entire transcript libraries
  • Multi-user collaboration with permission controls
  • Integration with Zoom, Teams, Google Meet, and Adobe Premiere
  • SOC 2 Type II certified with AES-256 encryption
  • HIPAA compliance for healthcare organizations
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
  • 90% cost reduction versus manual transcription at $10/hour versus $100+/hour
  • Transcription 10x faster than manual at 10 minutes versus 2-3 days
  • Structured conversation objects convert transcripts into searchable, audit-ready intelligence
  • Enterprise-grade security with SOC 2, HIPAA, and zero training policy on customer data
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 check74 no change since last check
Trust Flow (Majestic)1017
Citation Flow (Majestic)3064
Referring domains (Majestic)963280

4 details filled in for both companies.

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