Dunno vs STEM Teller
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Dunno
This comprehensive English learning tool offers offline dictionary access, camera and voice translation, pronunciation scoring, and grammar lessons. It includes a vocabulary notebook with flashcards and quizzes, plus practice tests for standardized exams.
- Offline dictionary and grammar
- Camera and voice translation
- Pronunciation scoring
- Vocabulary notebook with flashcards
- Grammar lessons by CEFR level
- TOEIC mock tests
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Look up any English word, translate text or photos, and hear how it's actually pronounced — online or offline. Dunno is more than a dictionary. It's a complete English learning assistant: 350,000 words, grammar organized by CEFR level, camera and voice translation, pronunciation scoring, and your own vocabulary notebook with flashcards and quizzes. LOOK UP ANYTHING, ANYWHERE - Full offline dictionary — words, grammar, prepositions, sentence patterns, images - Autocomplete predicts the word as you type - Search by voice, or point your camera at a word and get the meaning instantly - Every entry includes definitions, examples, word forms, synonyms, antonyms and related words - Audio pronunciation in both British and American English TRANSLATE 89 LANGUAGES Two-way translation for text, photos and full sentences — Spanish, French, Chinese, Japanese, Korean, Vietnamese and 80+ more. PERFECT YOUR PRONUNCIATION Record yourself, compare it with a native speaker, and get instant feedback on exactly what to fix. CHECK YOUR GRAMMAR Paste any sentence to catch spelling and grammar mistakes, with a clear explanation of every correction. GRAMMAR BY LEVEL 127 grammar topics organized from A1 to C2, so you always know what to learn next. YOUR VOCABULARY NOTEBOOK - Save any word with one tap - Review with flashcards and quizzes so words actually stick - Ready-made lists: 3,000 TOEIC words, plus IELTS, TOEFL and SAT sets - Word lists by field of study and difficulty level - Track how many words, sentences and grammar points you've mastered - Keep studying on your lock screen in spare moments PRACTICE FOR THE TEST Full TOEIC mock tests with answer keys and detailed explanations for every question. ASK THE COMMUNITY Stuck on a sentence? Post it and get answers from other learners. BY THE NUMBERS - 350,000 English words - 418,000 examples and illustrations - 127 grammar lessons, A1 to C2 - 89 translation languages Also available on the web at http://dunno.ai Privacy Policy: https://dunno.ai/other/privacy-policy Terms of Use: https://dunno.ai/other/term WE READ EVERY MESSAGE Send ideas, bug reports or feature requests to eup.mobi@gmail.com — thank you!
STEM Teller
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1) Read STEM books: Science, Technology, Engineering, Mathematics, CCSS 2) Comprehension Quiz 3) Diagram 4) Vocabulary
Screenshots
Verdict
The clearest difference is in-app purchases: STEM Teller at none against Dunno's 10. Dunno's advantage is device support. On price 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. Dunno sells 10 in-app purchases, starting at $6.49 per 3 months. STEM Teller asks for nothing beyond the download.
| Parameter | Dunno | STEM Teller |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (31 ratings) — better | — |
| Positive reviews | 90.5% of reviews | — |
| Number of ratings | 31 — better | — |
| Update frequency | Every 2 weeks | — |
| Ads | Yes | — |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod — better | — |
| Requires iOS | 13.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 155 MB | 255 MB |
| Age rating | 4+ | 4+ |
| Developer | Linh Nguyen | DIA-HAEBO CO. LTD |
In-app purchases
Dunno
- Basic version [-50%]$6.493 Months
- Basic version [-40%]$7.493 Months
- Standard version [-50%]$8.491 Year
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- Basic version [-30%]$8.993 Months
- Standard version [-40%]$10.491 Year
- Standard version [-30%]$11.991 Year
- Premium version [-50%]$9.99
- Premium version [-40%]$11.99
- Premium version [-30%]$13.99
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- Premium version$19.99
STEM Teller
No in-app purchases









