TransFlow vs Doc Translator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
TransFlow
Translate foreign language EPUB books into your preferred language using on-device translation. Read translated books with customizable themes and export them to your favorite EPUB readers. Offers both translation-only and bilingual output options.
- On-device EPUB translation
- Bilingual output option
- Customizable reader themes
- Queue multiple books for translation
- Export translated EPUBs
- Pause and resume translation
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Designed for reading in your language! TransFlow turns foreign-language EPUBs into translated EPUBs using Apple’s on-device translation. No API keys, no accounts, no servers — your books never leave your device. Key features: Import a reflowable EPUB, pick source and target languages, and translate on your device Leave anytime — the job pauses and picks up where it left off when you come back Queue several books; switching pauses the current one instead of losing progress Translation-only, or bilingual output that keeps each original passage with its translation below¹ Clean paginated reader with swipe or tap-to-turn pages; remembers your place (including iPad rotation and split screen) Reading themes, font size, line spacing, and margins; extra downloadable fonts¹ The result is a real EPUB — export to Apple Books, ReadFlow, or any EPUB reader¹ Free to download. Translating and reading stay free (translation-only). TransFlow Pro is a one-time purchase that unlocks bilingual output, unlimited exports (3 free to try), automatic light/dark reading theme, and extra fonts. For readers who want the file itself: export a real EPUB anytime and keep reading wherever you like. ¹ Bilingual output, unlimited exports, auto theme, and downloadable fonts require TransFlow Pro. Fixed-layout EPUBs (comics, picture books, heavily designed layouts) are not supported. Translation quality and available languages depend on Apple’s on-device translation. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://is.gd/xWX6SJ
Doc Translator
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TRANSLATE DOCUMENTS. KEEP THE LAYOUT. Doc Translator uses accurate AI to translate complete documents into 100+ languages, including English, Spanish, French, German, and Arabic, while preserving the original layout and formatting. WORK WITH THE FILES YOU ALREADY USE Translate PDF, Word, Excel, PowerPoint, EPUB, images, subtitles, and more. With support for 30+ file types, you can translate reports, presentations, spreadsheets, books, manuals, research papers, resumes, and localization files. KEEP YOUR DOCUMENT INTACT • Preserve page layouts, tables, columns, images, and styles • Use OCR to translate scans and text inside images • Track progress and access recent translations SIMPLE WORKFLOW 1. Upload a file 2. Choose the target language and translation options 3. Review the credit cost 4. Download the translated file
Screenshots
Verdict
The clearest difference is update cadence: Doc Translator at every 5 days against TransFlow's every 17 months. Doc Translator also leads on iOS requirement (18.0 vs 26.0). 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
Both are free to download. TransFlow sells 1 one-off in-app purchase and Doc Translator sells 4 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.
TransFlow ships an update every 17 months, Doc Translator every 5 days. The most recent releases landed on November 8, 2026 and October 29, 2026 respectively.
| Parameter | TransFlow | Doc Translator |
|---|---|---|
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | — |
| Update frequency | Every 17 months | Every 5 days — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, Mac — better | iPhone, iPad |
| Requires iOS | 26.0 | 18.0 — better |
| Further details — not scored | ||
| Size | 11 MB | 18 MB |
| Age rating | 4+ | 4+ |
| Developer | 实 许 | 炜桢 吕 |
In-app purchases
TransFlow
- TransFlow Pro$9.99
Doc Translator
- 100 Credits$2.99
- 300 Credits$7.99
- 1000 Credits$24.99
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- 3000 Credits$69.99









