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Transcription API vs OpenAI Whisper API, AssemblyAI & Rev

OpenAI's Whisper API, AssemblyAI, Deepgram, and Rev are excellent paid speech-to-text services — they bill per minute and need an API key and billing on file. The Forge Transcription API runs OpenAI's Whisper model for you, server-side, for free: POST an audio or video file and get back plain text or ready-to-use SRT/VTT subtitles. No key, no per-minute meter, no signup.

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The Quick Comparison

Feature	Forge Transcription	Whisper API / AssemblyAI / Rev
Transcribe in the browser	✓	✓ (dashboards / consumer apps)
Free REST API for scripts & CI	✓ (`POST /transcribe`)	× (API key + billing required)
Direct SRT & VTT subtitle output	✓	partial (often JSON; subtitle formatting is extra)
Video files (audio auto-extracted)	✓ (MP4, WEBM, etc.)	varies by provider
Per-minute charge	× ($0)	✓ (metered or subscription)
Speaker diarization	×	✓ (AssemblyAI / Deepgram)
Real-time streaming	×	✓ (Deepgram / AssemblyAI)
Requires signup / API key	×	✓

Where Forge Transcription Wins

1. It is a free endpoint, not a metered API

The paid services charge per minute of audio and gate everything behind an API key. Forge Transcription is one curl away with no account:

curl -X POST -F "file=@audio.mp3" \
  https://forge-node.tail2b516d.ts.net/transcribe

The same call works from Python, Node, Bash, or a cron job. No login, no billing, no key.

2. Subtitles come out ready to use

Need a caption file rather than a transcript blob? Ask for SRT or VTT directly — no post-processing step to turn JSON timestamps into a subtitle file:

curl -X POST -F "file=@talk.mp3" \
  https://forge-node.tail2b516d.ts.net/transcribe -o subtitles.srt

Swap the output filename to subtitles.vtt for WebVTT. Drop the file straight into a video player or YouTube's subtitle uploader.

3. Video in, text out

Upload an MP4, WEBM, or other video file and the audio track is extracted and transcribed automatically. You do not need to run ffmpeg first to pull the audio.

4. Whisper under the hood, no meter

Forge Transcription runs OpenAI's open Whisper model (the base model) on the server. You get Whisper-quality output without standing up a GPU, installing the model, or paying the hosted Whisper API's per-minute rate.

When Whisper API, AssemblyAI & Rev Are Still Fine

You need speaker diarization — labeling who said what across a multi-speaker recording. AssemblyAI and Deepgram do this well; Forge does not.
You need real-time streaming transcription for live captions. The streaming providers are built for that; Forge is batch-only (upload then transcribe).
You need broadcast-grade accuracy at scale, tuned across 99 languages, with SLAs and compliance certifications. The Whisper base model trades some accuracy for speed; a larger model or a paid service is the right call there.
You have very long multi-hour files or human-reviewed transcripts as a deliverable — Rev's human transcription exists for exactly that.

Use Cases for Forge Transcription

Podcast subtitle drafts. Generate a first-pass SRT for each episode, then light-edit instead of typing from scratch.
CI test fixtures. Produce caption files for test media in your pipeline without a paid key in the build secrets.
Indie video subtitles. Caption a YouTube upload by dropping the SRT straight into the subtitle uploader.
Meeting and voice-note transcripts. Turn a recorded standup or a voice memo into searchable text.
Accessibility on a budget. Add captions to course videos or webinars when there is no transcription line item.

FAQ

Is the Forge Transcription API really free?

Yes. No signup, no API key. Rate-limited per IP to keep abuse low. Details in the Transcription API docs.

What formats can I upload, and what comes back?

Upload audio (MP3, WAV, M4A, etc.) or video (MP4, WEBM, etc.). Output is plain text, SRT, or WebVTT subtitles. Files up to 25 MB.

Which model does it use?

OpenAI's Whisper base model, running server-side. Good for clear audio; noisy or heavily accented multi-speaker audio may need a larger or paid model.

Where do I go next?

Try the Transcription tool, or browse the full free API catalog for 15 more developer APIs in the same no-signup style.