Comparison

Caption AI vs SubAI

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Caption AI

Features
Read full description

Add automatic subtitles to your videos so viewers can follow what you say, even with the sound off. Translate your subtitles and customize their look with Caption AI. Made for vlogs, tutorials, and everyday stories, Caption AI brings subtitle creation and useful video tools into one app. AUTOMATIC VIDEO SUBTITLES Turn speech in your video into on-screen text and reduce manual typing. Generate subtitles for your footage, then review the result before sharing. TRANSLATION AND BILINGUAL SUBTITLES Translate subtitles into supported languages and display the original alongside the translation. Customize the style of each language separately to help viewers tell them apart. Available recognition and translation languages are shown in the app. YOUR SUBTITLES, YOUR STYLE Choose fonts, adjust text size and color, and customize layout and alignment. Match the subtitles to your video and keep the words easy to read. BASIC VIDEO EDITING Trim and cut footage, change playback speed, and adjust brightness, contrast, and saturation as part of your subtitle workflow. A TELEPROMPTER FOR YOUR SCRIPT Read scrolling text with adjustable speed, font size, and colors. Use it to support presentations, vlogs, and other scripted content. MORE TOOLS FOR VIDEO CREATION - Split-screen video: combine two clips side by side or vertically, with adjustable positioning and proportions. - Video compression: choose high, medium, or low quality to balance file size and image quality. - Chat videos: create fictional one-to-one or group conversations for storytelling and content demonstrations. - Video assets: browse, filter, and download clips to use in your projects. START WITH A VIDEO Choose your footage, generate and translate subtitles, adjust their appearance, and export your captioned video. PREMIUM FEATURES Automatic speech recognition, subtitle translation, captioned-video export, and ad removal are premium features. Check the in-app purchase screen for available plans, prices, feature access, and any usage limits. Auto-renewable subscriptions renew unless canceled. You can manage subscriptions in your App Store account settings. Check the purchase screen for the terms of each option. Contact: nicekeep@126.com Privacy Policy https://www.freeprivacypolicy.com/live/39e5616d-405f-4dd4-a783-77fa720f49b2 EULA https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Terms & Conditions https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ ---------------------------------------------------------------------- 1. VIP Membership VIP membership includes Weekly, Monthly, Yearly, and Lifetime plans. With a Premium Membership, you can enjoy the following features: • Remove all ads • Automatically recognize speech in videos • Translate subtitles into multiple languages • Export videos with subtitles 2. Subscription Plans The subscription plans provide access to ad-free experience, automatic speech recognition, subtitle translation, and exporting subtitle videos. This app offers the following subscription options: • $2.49 per week • $3.99 per month • $13.99 per year • $55.99 Lifetime purchase 3. Subscription Payment and Auto-Renewal Payment will be charged to your App Store account when you confirm the purchase. Subscriptions will automatically renew unless auto-renewal is turned off at least 24 hours before the end of the current subscription period. You can manage or turn off auto-renewal at any time in your App Store account settings after purchase.

About

SubAI

Easily generate bilingual subtitles for local videos in seconds. This tool makes foreign language content, online courses, and tutorials more accessible by transcribing speech and embedding subtitles directly into your videos. All processing is done on-device for enhanced privacy.

Highlights
  • AI subtitle generation
  • Bilingual subtitle support
  • Burned-in subtitle recognition
  • Fast subtitle embedding
  • SRT, VTT, TXT export
  • 100% local processing
Features
Read full description

Can't understand foreign videos? SubAI helps you generate bilingual subtitles for local videos in seconds, making movies, online courses, interviews, tutorials, and foreign-language content easier to understand. All processing happens locally on your device — your videos are never uploaded. KEY FEATURES • AI Subtitle Generation Automatically transcribe speech into accurate subtitles. • Multi-Language Subtitles Support for bilingual subtitles in Chinese, English, Japanese, Korean, French, German, and more. • Burned-In Subtitle Recognition Extract subtitles directly from videos with embedded text. • Fast Subtitle Burn-In Embed subtitles directly into videos and export MP4 instantly. • Subtitle File Export Export subtitles in SRT, VTT, and TXT formats. • 100% Local Processing All processing happens on-device. Your videos never leave your phone. USE CASES • Watch foreign videos with bilingual subtitles • Understand online courses and tutorials more easily • Generate subtitles automatically for short videos • Export professional subtitle files for editing SUBSCRIPTION SubAI offers auto-renewable subscriptions. Payment will be charged to your Apple ID account at confirmation of purchase. Subscriptions automatically renew unless canceled at least 24 hours before the end of the current billing period. You can manage or cancel your subscription anytime in your App Store account settings after purchase. Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription. Subscription pricing may vary by region and plan. Current pricing is displayed inside the app before purchase. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Caption AI4 screens
SubAI4 screens

Verdict

The call

The clearest difference is update cadence: SubAI at every 5 days against Caption AI's monthly. Caption AI's advantage is iOS requirement (16.0 vs 18.0). On price, ads, in-app purchases and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Caption AI sells 4 in-app purchases, starting at $2.99 per 7 days and SubAI sells 3 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Caption AI ships an update monthly, SubAI every 5 days. Both last shipped on October 31, 2026.

Scorecard2 real differences · 7 level
Caption AI versus SubAI: the parameters behind the verdict, then further details
ParameterCaption AISubAI
PriceFreeFree
Rating—5.0 (1 ratings) — better
Number of ratings—1 — better
Update frequencyMonthlyEvery 5 days — better
AdsNoNo
In-app purchasesYesYes
Monetization—Freemium
DevicesiPhoneiPhone, iPad — better
Requires iOS16.0 — better18.0
Further details — not scored
Size48 MB152 MB
Age rating4+4+
DeveloperBeijing Xingnian Trading Department (Individually Owned Business)琦 马

In-app purchases

4 purchases

Caption AI

Subscriptions3
  • Weekly$2.997 Days
  • Monthly$3.991 Month
  • Annual$14.991 Year
One-time1
  • Lifetime$59.99
3 purchases

SubAI

Subscriptions2
  • SubAI Pro Monthly$3.991 Month
  • SubAI Pro Yearly$14.991 Year
One-time1
  • SubAI Lifetime$29.99

Questions

Is Caption AI free?
Caption AI is free to download, with in-app purchases available.
Is SubAI free?
SubAI is free to download, with in-app purchases available.
Do Caption AI or SubAI have ads?
Neither Caption AI nor SubAI shows ads.
Which is updated more often, Caption AI or SubAI?
Caption AI ships an update monthly, and SubAI every 5 days. Most recently, Caption AI was updated on October 31, 2026 and SubAI on October 31, 2026.

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