Comparison

Parallel Books vs TTdictionary Offline

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

Head to head
About

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.

Highlights
  • Dual language display
  • Synchronized translations
  • Adjustable display modes
  • Searchable notes
  • Day/night themes
  • Highlighting
Features
Read full description

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.

About

TTdictionary Offline

This app provides offline access to over 50 dictionaries, including Russian, English, German, and more. It features a fast search, flashcards for learning, word history, and text-to-speech functionality for pronunciation.

Highlights
  • Offline dictionary access
  • Over 50 dictionaries
  • Fast search functionality
  • Flashcard training feature
  • Word history and favorites
  • Text-to-speech pronunciation
  • Night mode and search filters
Features
Read full description

TTdictionary is a free offline dictionary and vocabulary trainer: 93 dictionaries across 30 languages, plus an AI assistant that explains any word. Works without internet. Download only the dictionaries you need. After the download every lookup is offline — no connection, no account, no sign-up. AI ASSISTANT (NEW) Tap a word and the AI explains it in context: • Definition, usage and common mistakes • Synonyms, antonyms and idioms • Etymology and historical origin • Pronunciation guide and example sentences Save the answer as a note, add it to the entry, or share it. YOUR OWN WORDS (NEW) • Add your own words and definitions • Edit any existing definition — or let the AI write it for you • Your entries are searchable like the built-in ones LANGUAGES Arabic, Azerbaijani, Belarusian, Bulgarian, Chinese, Czech, Dutch, English, Estonian, Finnish, French, Georgian, German, Greek, Hindi, Italian, Japanese, Kazakh, Kyrgyz, Latvian, Persian, Polish, Russian, Spanish, Tajik, Tatar, Turkish, Turkmen, Ukrainian, Uzbek. Popular pairs: Russian-English, Russian-German, Russian-Turkish, Russian-Spanish, Russian-French, Russian-Kazakh, Russian-Persian, Russian-Japanese, English-German, English-French, English-Spanish, English-Turkish, English-Uzbek, English-Kyrgyz, English-Azerbaijani, German-Turkish, French-Italian, Ukrainian-English. SPECIAL DICTIONARIES Synonyms and antonyms, etymology, phraseology and idioms, law and legal terms, medical dictionaries and encyclopedia, psychology, philosophy, accounting, names, classic literature, and monolingual explanatory dictionaries. LEARNING • Flashcard training • Quizzes to test what you have learned • Favorites, bookmarks, notes and search history SEARCH • Instant search, even in large dictionaries • Full-text search inside definitions • Filters: starts with, ends with, contains • Browse the whole dictionary by alphabet • Search text copied to the clipboard • Text-to-speech for a word or a selected passage • Next, random and previous word buttons • Dark mode PRIVACY Your searches, bookmarks, notes and history stay on your device. We never upload them anywhere. Support: hasanaga.mammadov@gmail.com Privacy Policy: https://ttdictionary.com/privacy_policy/ttdictionary_privacy_policy.html Support page: https://ttdictionary.com/privacy_policy/ttdictionary_support.html TTDICTIONARY PREMIUM • Yearly — 1 year, with a 3-day free trial • Monthly — 1 month • Pro Lifetime — one-time purchase, not a subscription Premium removes ads and raises the AI assistant limits. Prices are shown in the app before you confirm the purchase and may vary by region. Payment is charged to your Apple Account at confirmation of purchase. Subscriptions renew automatically unless cancelled at least 24 hours before the end of the current period; cancel the free trial at least 24 hours before it ends to avoid being charged. You can manage or cancel your subscription in your Apple Account settings. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Parallel Books4 screens
TTdictionary Offline4 screens

Verdict

The call

The clearest difference is in-app purchases: Parallel Books at none against TTdictionary Offline's 3. Parallel Books also leads on ads (none vs shown). TTdictionary Offline's advantage is update cadence (every 9 days vs every 3 months). On price, review sentiment, device support and iOS requirement 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. TTdictionary Offline sells 3 in-app purchases, starting at $2.99 per month. Parallel Books asks for nothing beyond the download.

UpkeepUpdate frequency

Parallel Books ships an update every 3 months, TTdictionary Offline every 9 days. The most recent releases landed on October 17, 2026 and October 7, 2026 respectively.

Scorecard4 real differences · 6 level
Parallel Books versus TTdictionary Offline: the parameters behind the verdict, then further details
ParameterParallel BooksTTdictionary Offline
PriceFreeFree
Rating—4.6 (39 ratings) — better
Positive reviews40.0% of reviews42.3% of reviews — better
Number of ratings—39 — better
Update frequencyEvery 3 monthsEvery 9 days — better
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationFree — betterAd-supported
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.615.0 — better
Further details — not scored
Size2 MB78 MB
Age rating12+4+
DeveloperHigh Tea IT LimitedHasanaga Mammadov

Customer experience

Parallel Books

All ratings77 ratings
Positive75.3%
Neutral0.0%
Negative24.7%
Written reviews30 reviews
Positive40.0%
Neutral3.3%
Negative56.7%

TTdictionary Offline

All ratings39 ratings
Positive89.7%
Neutral2.6%
Negative7.7%
Written reviews26 reviews
Positive42.3%
Neutral19.2%
Negative38.5%

In-app purchases

None

Parallel Books

No in-app purchases

3 purchases

TTdictionary Offline

Subscriptions2
  • Premium Monthly$2.991 Month
  • Premium Yearly3 Days trial$12.991 Year
One-time1
  • Premium Lifetime$39.99

Questions

Is Parallel Books free?
Parallel Books is free to download, with no in-app purchases.
Is TTdictionary Offline free?
TTdictionary Offline is free to download, with in-app purchases available.
Do Parallel Books or TTdictionary Offline have ads?
TTdictionary Offline shows ads; Parallel Books does not.
Which is updated more often, Parallel Books or TTdictionary Offline?
Parallel Books ships an update every 3 months, and TTdictionary Offline every 9 days. Most recently, Parallel Books was updated on October 17, 2026 and TTdictionary Offline on October 7, 2026.

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