BTLB vs Parallel Books
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
BTLB
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BTLB | bɪtlɪb | is your progressive library companion for libraries within Stiftung Hamburger Öffentliche Bücherhallen and Gemeinsamer Bibliotheksverbund! As a pioneer in regards to an App for managing your library account, BTLB offers what you’d expect from a library in the modern age. Always have your library account under control - with the Widget the next expiry date is just a glance away! Siri is your friend when you'd like to renew or search for an item. Say "Renew items with bɪtlɪb" and the Shortcut to renew your items will be triggered. Configure if and when you want to receive reminder notifications before items are due and renew them directly from the notification. The UI design aims to be plain and simple. Light and Dark Mode, accessibility and dynamic font are supported. And regarding your search history - that’s being synchronised across your devices. Tracking does not happen within BTLB, no user data is tracked and your account information stays in your keychain. BTLB enables you to synchronise your German library account with your device: you can see which items you have borrowed and how much you owe the libraries for tardily returning them. You can interact with your library as the App can renew items with a tap of your finger. Searching your favorite library allows to check on available items and store them locally in your bookmarks. Generate AI recommendations based on your bookmarks and check availability in your local library. Stiftung Hamburger Öffentliche Bücherhallen supports both account synchronization and search, others (libraries in GBV) only support search at the moment – they will regain account synchronization in the future. Enjoy BTLB | bɪtlɪb | and happy reading! P.s.: please don't hesitate and let me know if there is an inconvenience in usability for you. Any feedback and suggestions are most welcome.
Parallel Books
Learn a new language by reading books with side-by-side translations. This app keeps translations synchronized as you read, allowing for full immersion. Easily switch between display modes and add notes for a personalized learning experience.
- Dual language display
- Synchronized translations
- Adjustable display modes
- Searchable notes
- Day/night themes
- Highlighting
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Become fluent in a new language. Read a book in your new tongue while having a parallel copy in your native language handy for reference. Now thanks to Parallel Books, this technique is available on iPad, iPhone and iPod touch. Translations will automatically stay in sync, leaving you free to be immersed in the words on the page. Reading a book in two different languages at the same time has never been easier! - Designed for people learning a new language. - Displays a book simultaneously in two different languages. - Translations stay in sync as you read. - Stretchy, “chewing gum" overlay visually connects parallel content. - Chewing gum overlay can be hidden. - Translations can be displayed in two columns on the screen, or each translation can fill an entire screen. - Continuously scrolls or pages through content without needing to change mode. - Tapping on a paragraph shows the translation of that paragraph. - Double tapping hides tool bars, giving more space. - Multicolored highlights and searchable notes can be added. - Includes day and night themes. - Currently books are available in English, German, French, Spanish, Portuguese, Russian, Italian, Dutch, Swedish, Esperanto, Korean, Chinese, Arabic plus more. - Some books include multiple translations in the same language; ideal for literature and translation students. - Parallel Books is in development for other platforms. - New books are being added all the time. - All books are currently FREE.
Screenshots
Verdict
The clearest difference is update cadence: BTLB at monthly against Parallel Books's every 3 months. Parallel Books's advantage is iOS requirement (15.6 vs 17.2). 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. Neither carries in-app purchases, so what you see is what you pay.
BTLB ships an update monthly, Parallel Books every 3 months. The most recent releases landed on September 9, 2026 and August 28, 2026 respectively.
| Parameter | BTLB | Parallel Books |
|---|---|---|
| Price | Free | Free |
| Positive reviews | — | 40.0% of reviews |
| Update frequency | Monthly — better | Every 3 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17.2 | 15.6 — better |
| Further details — not scored | ||
| Size | 20 MB | 2 MB |
| Age rating | 4+ | 12+ |
| Developer | Martin Kim Đưng-Phạm | High Tea IT Limited |
In-app purchases
BTLB
No in-app purchases
Parallel Books
No in-app purchases









