SelectTranslate vs Caption AI
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SelectTranslate
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【SelectTranslate】Free AI translator for bilingual Web, PDF, papers, video, meetings, images & ebooks. Powered by 20+ top AI models. 【AI Expert】 and 【Termbase】 are now live! Built-in popular experts and termbases are ready to use, and custom experts and terms are also supported, making translation for specialized domains more accurate and professional! 【Bilingual Webpage Translation】: Intelligently identifies and translates webpage content, displaying the translation beneath each original paragraph for a clean, seamless bilingual reading experience. 【PDF Translation】: Completely free PDF translation function, offers rapid translation of foreign language documents while preserving the original document format and layout. 【PDF Plus】: The advanced PDF translation function is designed specifically for translating academic papers and various professional PDF documents. 【ePub e-book translation】: With SelectTranslate, you can easily convert various foreign language ePub eBooks into bilingual versions that are fully compatible with a wide range of e-book readers, helping you break down language barriers and enjoy high-quality global literary resources. 【More Document Translation Features】: Also supports translating Word, TXT, HTML, Markdown, and subtitle files (SRT/ASS). 【Video Subtitle Translation】: Supports bilingual subtitle translation on major global streaming platforms such as YouTube, Netflix, Disney+, and TED. 【Online Meeting Translation】: Supports real-time translation for a variety of mainstream online meeting platforms (voice subtitle translation, chat message translation, chat input translation), making cross-language communication smoother and more efficient. 【Optimal Translation】: An industry‑first approach that runs multiple translation models in parallel and uses a scoring model to intelligently score the outputs and automatically select the best translation, significantly improving both accuracy and reliability. 【Image Translation】: Supports quick translation of webpage images by right-click or hover, with the translated text fitted in place so reading stays uninterrupted. 【Input Translation】: Simply type text into webpage input fields for quick translation. 【AI Expert】: AI translation prompts tailored for different domains, with dedicated roles and translation rules that make specialized content more accurate and professional. 【Termbase】: Stores and manages standard translations of specialized terms across different scenarios to keep terminology accurate and consistent. 【Service & Support】: If you encounter any issues or have suggestions during use, feel free to contact us via our service email. Email: service@selecttranslate.com 【Terms of Use】: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Caption AI
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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.
Screenshots
Verdict
The clearest difference is device support: SelectTranslate at 4 against Caption AI's 1. On price, update cadence, ads and in-app purchases 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
Both are free to download. SelectTranslate sells 2 in-app purchases, starting at $6.00 per month and Caption AI sells 4 in-app purchases, starting at $2.99 per 7 days. Whichever you choose, the download price is not the number that matters.
SelectTranslate ships an update every 3 weeks, Caption AI monthly. The most recent releases landed on October 9, 2026 and October 12, 2026 respectively.
| Parameter | SelectTranslate | Caption AI |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 weeks — better | Monthly |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Devices | iPhone, iPad, iPod, Mac — better | iPhone |
| Requires iOS | 15.6 — better | 16.0 |
| Further details — not scored | ||
| Size | 41 MB | 48 MB |
| Age rating | 17+ | 4+ |
| Developer | HKZINGSOFTWARELIMITED | Beijing Xingnian Trading Department (Individually Owned Business) |
In-app purchases
SelectTranslate
- Plus Monthly Plan$6.001 Month
- Plus Annual Plan3 Days trial$66.001 Year
Caption AI
- Weekly$2.997 Days
- Monthly$3.991 Month
- Annual$14.991 Year
- Lifetime$59.99







