Onymera vs Study Bud AI
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
Study Bud AI
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Study Bud keeps every subject, lesson, note, flashcard, and exam you're studying in one organized place — and gives you an AI study partner to help you learn faster. ORGANIZE YOUR STUDY LIBRARY Build subjects, folders, and lessons the way that makes sense to you. Import PDFs and documents, write notes, and track your progress for every lesson. ASK BUD ANYTHING Stuck on a concept? Ask Bud — your AI study companion — for a quick answer or a deeper explanation, anytime. LET AI DO THE HEAVY LIFTING Paste your study material and let Bud: • Summarize long readings into the key points • Explain a confusing topic in plain language • Generate flashcards to review • Build a practice quiz or a full exam, complete with scoring • Put together a personalized study plan across your subjects PRACTICE WITH FLASHCARDS AND EXAMS Create your own flashcard sets and exams manually, or generate them instantly with AI. Track your scores and see your progress over time. YOUR STUDY LIBRARY STAYS ON YOUR DEVICE Your subjects, lessons, notes, flashcards, and exams are stored locally on your device — not on a server. Export an encrypted backup anytime so you never lose your work. BUILT FOR ENGLISH AND ARABIC Full support for both English and Arabic, including right-to-left layout — switch anytime from Settings. Study Bud uses a simple Credits system for AI features — new accounts get a one-time free Credits grant to try it out, and you can top up anytime.
Screenshots
Verdict
The clearest difference is device support: Study Bud AI at 3 against Onymera's 1. Study Bud AI also leads on iOS requirement (15.0 vs 17.0). On price, update cadence, ads and in-app purchases 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 and Study Bud AI sells 4 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.
Onymera ships an update every 2 days, Study Bud AI daily. Both last shipped on October 29, 2026.
| Parameter | Onymera | Study Bud AI |
|---|---|---|
| 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 | Daily — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone | iPhone, iPad, iPod — better |
| Requires iOS | 17.0 | 15.0 — better |
| Further details — not scored | ||
| Size | 2 MB | 31 MB |
| Age rating | 4+ | 4+ |
| Developer | Convoya | Khalid Alenazi |
In-app purchases
Onymera
- Onymera Full Unlock$2.99
Study Bud AI
- 100 Credits$1.99
- 500 Credits$14.99
- 1,500 Credits$34.99
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- 5,000 Credits$79.99









