Comparison
Subtitles King vs Rev.ai
Rev.ai targets media companies. Subtitles King targets devs and agents.
TL;DR
At a glance.
| Feature | Subtitles King | Rev.ai |
|---|---|---|
| Free tier | ✓ 100 MB videos | Trial credit only |
| Cost (paid) | Pro waitlist | ~$1.25/min (human) / $0.02/min (AI) |
| MCP server | ✓ | ✗ |
| Self-host | ✓ | ✗ |
| Human transcription option | ✗ | ✓ |
| Burned-in subtitles | ✓ | ✗ (transcript only) |
| Open source | ✓ | ✗ |
| Lines to integrate | ~3 | ~30 |
When Rev.ai wins
- Optional human transcription for higher accuracy on hard audio.
- Long history with media production workflows.
- Caption editor UI built in.
When Subtitles King wins
- No human-loop overhead — pure machine pipeline.
- Free tier with no trial-credit gymnastics.
- MCP-native for AI agents.
- Returns burned-in video, not a transcript file you have to render yourself.
Code
Integration, side by side.
Subtitles King
# Subtitles King: 3 lines
curl -X POST https://brains.subtitlesking.com/presign \
-H "X-API-KEY: $KEY" -d '{"filename":"clip.mp4"}'
curl -X POST "$URL" -F "file=@clip.mp4"
curl -X POST https://brains.subtitlesking.com/queue -d '{"authToken":"$T"}'Rev.ai
# Rev.ai: submit a job, poll, fetch transcript, then burn yourself
from rev_ai import apiclient
client = apiclient.RevAiAPIClient("your_key")
job = client.submit_job_local_file("clip.mp4")
import time
while True:
j = client.get_job_details(job.id)
if j.status.name == "TRANSCRIBED":
break
time.sleep(10)
captions = client.get_captions(job.id, content_type="application/x-subrip")
with open("out.srt", "w") as f:
f.write(captions)
# Then burn with ffmpeg yourself...FAQ
Common questions.
Why not use Rev.ai's human transcription for max accuracy?+
For most video workloads, machine transcription is good enough and 50–100x cheaper. Rev human transcription is great for legal/medical accuracy needs, which we don't target.
Does Subtitles King have a captions editor?+
Not yet. We return the SRT file alongside the burned video, so you can use any external editor (Aegisub, Subtitle Edit, etc.) if you want to tweak.
How fast is Subtitles King vs Rev?+
A 5-minute video typically finishes in 3–6 minutes end-to-end on our pipeline (compress + Whisper + burn). Rev AI is similar; Rev human transcription takes hours.