SoCaptionsvsAssemblyAI
AssemblyAI is an ASR API, not a product. Developers build their own captioning UIs on top. AssemblyAI's accuracy is best-in-class, but you'll spend weeks shipping the editor, styling, and MP4 export that SoCaptions ships out of the box.
Side by side
- Best-in-class English WER (~5–6% on clean audio)
- Powerful API with diarization, sentiment, summarization, content moderation
- Pay-per-minute pricing scales for high-volume products
- No editor — you build the entire UX yourself
- No video output — you handle MP4 rendering yourself
- Wrong fit for a single creator captioning their own clips
- Editor, styling, and MP4 export shipped
- Cheaper for caption-only use
- Zero engineering required
You're building a product that needs ASR as a component — meeting bots, voice agents, custom captioning SaaS.
You're a creator who wants captions on your video, not an SDK to integrate.
AssemblyAI is the right tool for engineers shipping speech AI products. SoCaptions is the right tool for creators captioning videos. Don't use AssemblyAI to caption your own TikToks.
Frequently asked
How is AssemblyAI's accuracy compared to Whisper?+
AssemblyAI Universal-1 edges Whisper on diarization and slightly on English WER. Whisper edges Universal-1 on accent diversity and language coverage. For most creator workflows the difference is invisible.
Could I rebuild SoCaptions on AssemblyAI?+
Yes — you'd need to build the editor, the timeline, the style presets, the MP4 renderer, and the platform safe-zone overlays. Months of work to match what SoCaptions ships today.