Prismatext vs Klepsydra
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Prismatext
Effortlessly learn a new language by reading books. This app blends foreign words and phrases into literature, allowing for context-based vocabulary acquisition and natural grammar rule learning. Adjust the learning pace and density to suit your level, from beginner to advanced.
- Blended-language reading (Diglot Weave)
- Context-based vocabulary acquisition
- Adjustable learning density
- In-app definitions and pronunciation
- Progress tracking
- Offline reading
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Learning a language is hard. Studying a foreign language requires hundreds or thousands of hours, and everyone is busy. Prismatext offers the first effortless method for learning a language: blended-language reading! Now an hour spent reading is an hour spent learning. Using a science-backed method called "Diglot Weave", Prismatext books blend the most useful foreign words and phrases into modern and classic literature for context-based language learning. Prismatext translates more and more of the book you're reading into your target language. This allows the reader to naturally acquire new foreign vocabulary and grammatical rules. See phrases used in-context for improved recall. Repetition and incremental phrase addition allow you to easily learn new words at your desired pace - you can adjust the density at will. Beginner? No problem - tap the translations to see definitions and explainers, as well as the proper pronunciation of the phrase. Advanced? Try a higher level setting and a higher density for faster uptake. Skip the boring practice exercises, games, and gimmicks. Instead, pick up a book you've wanted to read and dive in! ========== PRISMATEXT WORKS Numerous peer-reviewed studies from around the world agree: diglot weave is one of the most effective learning methods for foreign language vocabulary retention. All levels welcome! The Prismatext experience is seamless and effortless, with settings from beginners up to advanced. ========== LEARN 17 LANGUAGES Arabic, Chinese (simplified), Dutch, French, German, Greek, Italian, Japanese, Korean, Latin, Norwegian, Polish, Portuguese, Russian, Spanish, Swedish, Ukrainian YOUR PACE Read at the same speed you would a standard book THE MOST USEFUL VOCABULARY Prismatext analyzes each book individually, and selects useful words and phrases from each one, depending on your level HEAR THE CORRECT PRONUNCIATION In-app audio pronunciations keep you from guessing how words sound TRACK YOUR PROGRESS Watch your word count climb while you do nothing but read a great story REGULAR UPDATES & CONTENT Prismatext books improve with time - your bookshelf can only get better. We release new titles and content every week! OFFLINE READING Once a book is downloaded, it can be read offline ========== Try a sample in the app today, or subscribe to a plan from Prismatext online and see the magic of read & learn!
Klepsydra
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Klepsydra is the very first novel with original soundtrack. Put your headphones on and, while reading, you will be immersed in a musical environment composed and performed for that novel only. You will then discover a new way of reading and you will get deep into a "page turner" fascinating historical thriller novel. Here is the pitch : "21 December 1988, 1907 hrs Three days before Christmas, an American airliner of the Panam crashes in the heart of the village of Lockerbie, in the south of Scotland, making 270 victims. After the stupor, opens the largest police investigation ever organized on the British territory. While Scotland Yard and the FBI are working together to identify the perpetrators of the tragedy, investigators are afraid of a new attack. A real race against time begins."
Screenshots
Verdict
The clearest difference is update cadence: Prismatext at every 5 weeks against Klepsydra's every 28 months. 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.
Prismatext ships an update every 5 weeks, Klepsydra every 28 months. The most recent releases landed on October 19, 2026 and October 10, 2026 respectively.
| Parameter | Prismatext | Klepsydra |
|---|---|---|
| Price | Free | Free |
| Rating | 3.9 (137 ratings) — better | — |
| Positive reviews | 54.1% of reviews | — |
| Number of ratings | 137 — better | — |
| Update frequency | Every 5 weeks — better | Every 28 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Subscription | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 16.0 | 15.0 — better |
| Further details — not scored | ||
| Size | 48 MB | 251 MB |
| Age rating | 4+ | 12+ |
| Developer | Prismatext LLC | Cyril de Nanteuil |
Bugs and requests
Prismatext
Reported bugs
3 issues- App crashes and freezes
- Login and access issues
- Incorrect translations and word choices
Requested features
4 requests- More book selection and genres
- Ability to toggle between target language and English
- Sync reading progress across devices
- Dark mode option
Klepsydra
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Prismatext
No in-app purchases
Klepsydra
No in-app purchases
Questions
Is Prismatext free?
Is Klepsydra free?
Do Prismatext or Klepsydra have ads?
Which is updated more often, Prismatext or Klepsydra?
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