Best auto captions apps, compared on what they actually state

How we compared caption apps

We compared what each vendor states on its own pages on 11 October 2026: how many caption styles, which languages, whether free exports carry a watermark, how long a video the plan accepts, and the entry price. We did not rank by accuracy, because we found no accuracy figure with a test method behind it. Submagic and Kapwing say 99 percent, VEED says up to 99.9 percent, Reap says 98 percent or more. None of them shows how it measured that.

That matters because W3C's accessibility guidance says automatically generated captions do not meet user needs unless someone confirms they are fully accurate, and that they usually need significant editing. Treat any app's accuracy claim as a marketing line and run your own test (the section after the table shows how).

The apps side by side

Test accuracy yourself in ten minutes

1. Pick one clip of about two minutes with two speakers, a few names and a few numbers. Avoid clean studio audio only. Include one noisy stretch.
2. Run the same clip through two or three apps on their free or lowest plan.
3. Read each result against the audio. Count wrong words per 100 words so the apps compare evenly.
4. Check the three costly errors: names, numbers, and any missing word like not that flips the meaning.
5. Time how long fixing each one takes. A tool with fewer errors but a clumsy editor can lose to one with more errors and a fast editor.
6. Export on the plan you would pay for and look for a watermark, using the steps in our guide to AI captions without a watermark.

YouTube gives the same advice about its own automatic captions: quality varies, so review and edit them before you rely on them.

Match the app to the job

• You caption short finished videos from a phone: Captions runs on iOS, Android and web. Its AI features need a paid plan to export, so test on the plan you will use.
• You need caption files: Kapwing and VEED list SRT, VTT and TXT downloads, and Reap lists SRT and VTT. Captions can download an SRT separately from its export options.
• You want one editor on phone, desktop and web: CapCut says Pro gives full benefits across all three, though its price varies by region.
• You caption talking-head clips and want heavy animation: Submagic, but mind the 2-minute cap on Starter.
• You start from a long podcast or interview and want clips and captions in one pass: a clip tool such as KeyMo or OpusClip saves a step. See our list of AI clip generators.

Where KeyMo fits, and where it does not

KeyMo is not a caption-only app. It will not caption a finished 45-second video, because it takes source videos of 5 minutes to 3 hours. What it does is cut up to 15 vertical clips from a long video, 1080x1920 at 30 fps, and caption each one word by word in one of 12 styles: Pro Glow, Bold Pop, Clean, Punch, Classic, Spotlight, Pulse, Karaoke, Reader, Duo, Slide or Headline. You can also choose no captions.

If a caption looks wrong, open the clip in the chat editor and tell KeyMo what to change. There is no watermark on any plan and no free plan: Starter is $12 a month for 300 source minutes, Pro is $29 for 900. We do not claim caption languages or an accuracy percentage for KeyMo, so test it on your own audio. For ideas on styles, see word-by-word captions.