Onymera vs Kapi
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Onymera
Learn new words daily with this app that displays a different word on your lock screen every minute. It offers extensive vocabulary lists in nine languages, complete with definitions, example sentences, and pronunciation guides. The app works offline and allows for personalized word selection based on your needs.
- Daily word display on lock screen
- Extensive vocabulary in 9 languages
- Definitions, example sentences, and pronunciation
- Offline functionality
- Customizable word selection
- Word history and saved words
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A new word, where you already look. Onymera puts a word on your lock screen and changes it about once a minute, so you meet a different one almost every time you glance at your phone. Not a notification. Not a feed. Nothing to open, nothing to remember, no streak to keep alive. NINE LANGUAGES, 32,000 WORDS AND COUNTING, ALL FREE • Korean - 5,965 words: the complete National Institute of Korean Language learner list, beginner through advanced, with Hanja origins where they help. • Japanese - 3,984 words: JLPT N5 and N4, and N3 well under way. Every entry carries its kana reading and romaji. • Chinese - 4,571 words: HSK 1 to 5, and the start of HSK 6, with pinyin. Simplified characters. • English - 4,295 words across four tiers, from everyday to genuinely rare. • Spanish - 2,709 words: CEFR A1, A2 and B1, with IPA so you know where the stress falls. • Portuguese - 2,592 words: A1, A2 and B1. Brazilian: ônibus, trem, celular, você. • French - 2,708 words: CEFR A1, A2 and B1, with IPA for everything the spelling hides. • German - 2,699 words: CEFR A1, A2 and B1, from the Goethe-Institut's own examination lists. • Italian - 2,697 words: CEFR A1, A2 and B1, with open and closed vowels marked. The word lists follow the official curriculum for each language where one exists, and every entry passes the same validator before it ships. Pick a language and the whole rotation follows; your history and saved words are kept separately for each one. EVERY ENTRY HAS A SENTENCE A definition in plain English, under 140 characters. An example sentence where the meaning is obvious from context, with a translation. Tap the widget for the pronunciation, the definition and the sentence, with the last five words you were shown underneath, so a word you half caught is never lost. TELL IT WHAT YOU'RE HEADING INTO Say, in plain English, what words you want to see: "a week in Seoul", "my first job in a Berlin office", "nothing beginner" - and the rotation follows. Thousands of words per language means even a very specific request comes back with a real list. This is the one optional purchase; everything else is free and complete without it. DOWNLOADS ONCE, THEN WORKS WITH NO SIGNAL A language is fetched the first time you pick it - a few hundred kilobytes - and from then on it lives on your phone. No account, no sign-up, nothing to fetch on a plane. The lists keep growing, and each language updates itself the next time you use it: new words arrive without an app update. A LIBRARY THAT FILLS ITSELF Your history is rebuilt from the rotation itself, so it is complete whether or not you opened the app. Save the ones you want to keep. Search by the word, by how it sounds, or by what it means in English. Accents and umlauts are optional: "manana" finds mañana, "schon" finds schön. LOCK SCREEN AND HOME SCREEN A rectangular and an inline widget for the lock screen. Small and medium widgets for the home screen: the small one is a glance, the medium one brings the example sentence with it. All free, and the app shows you how to add them the first time you open it. OPTIONAL: PERSONALIZATION - $2.99, ONCE The steering described above, plus the pace: slow the widget down to one word an hour, or one a day to sit with, rather than a new one every look. Your selection follows you to any device you sign in on. One payment. No subscription, ever. Nothing recurring anywhere in the app. — iPhone, iOS 17 or later. Privacy: onymera.app/privacy
Kapi
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A little Japanese, every time you look. Kapi puts a kanji on your Lock Screen with designs that show its sounds and meaning. Tap a character widget to open that character in the app. Kapi requires a subscription for the app and widgets. Choose monthly or yearly. Eligible yearly subscriptions include a 3-day free trial; monthly has no free trial. You see the local price before confirming with Apple. LEARN ONE CHARACTER AT A TIME Reveal the sounds, meaning and a real example word when one is available. Hear the readings with your iPhone's voice. Explore pieces, stroke order and additional words drawn from open dictionary data. WIDGETS FOR THE WAY YOU LEARN Add Lock Screen or Home Screen widgets and choose a design. Kapi follows your chosen flip schedule, subject to iOS refresh timing. Some designs teach; others help you recall characters you have already met. SHORT CHECKS, WITHOUT A STREAK Answer short checks in the app or the Home Screen quiz widget. Wrong answers bring teaching and another chance. A daily limit keeps the question count bounded; there is no streak to protect. Checks need enough learned characters to supply real alternatives. A REAL SENTENCE EACH DAY After meeting four characters, unlock a daily sentence with spoken readings and word explanations. Browse your dated sentence archive in the app. ALL FIVE LEVELS Explore 2,211 kanji across N5-N1. Search the Library, mark characters you already know and see your learning history in Progress. Rare characters may not have an example word or sentence. YOUR LEARNING STAYS ON YOUR DEVICE No login is needed. Learning data is bundled and progress is stored locally. An internet connection is needed for purchases and purchase checks; Apple and RevenueCat handle subscriptions and purchase analytics. If you contact support, we receive the message you choose to send. SUBSCRIPTIONS Monthly and yearly plans renew automatically unless cancelled. For an eligible yearly trial, cancel at least 24 hours before the trial ends to avoid the first charge. Manage or cancel in your Apple subscription settings. Deleting Kapi does not cancel a subscription. Restore purchases is available in the app. Privacy: https://zarif785.github.io/kapi-legal/privacy Terms: https://zarif785.github.io/kapi-legal/terms Apple standard EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Support: zarif.arefein@gmail.com
Screenshots
Verdict
The clearest difference is in-app purchases: Kapi at none against Onymera's 1. On price, ads, 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
Both are free to download. Onymera sells 1 one-off in-app purchase. Kapi asks for nothing beyond the download.
| Parameter | Onymera | Kapi |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (3 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 3 — better | — |
| Update frequency | Every 2 days | — |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone | iPhone |
| Requires iOS | 17.0 | 17.0 |
| Further details — not scored | ||
| Size | 2 MB | 31 MB |
| Age rating | 4+ | 12+ |
| Developer | Convoya | Zarif Raiyan Arefeen |
In-app purchases
Onymera
- Onymera Full Unlock$2.99
Kapi
No in-app purchases









