SynQuiz vs Sentence Monster
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SynQuiz
Explore the fascinating world of synaesthesia with playful tests designed to reveal if you experience interconnected senses. Discover if your grapheme-colour synaesthesia aligns with ongoing genetic research and potentially contribute to scientific studies.
- Four playful synaesthesia tests
- Grapheme-colour synaesthesia assessment
- Application for genetic studies
- Test scores sharing
- English, German, and Dutch languages
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SynQuiz is an app that contains four playful tests for synaesthesia. Synaesthesia is a neurodevelopmental trait estimated to occur in about 4% of the general human population. For people with synaesthesia two or more senses appear to be interconnected; for example a synaesthete perceives certain concepts, such as letters, numbers, days of the week, or months of the year as inherently coloured. Many synaesthetes are not aware that their perceptions are unusual and are often surprised to find out that others do not think of letters, numbers, or weekdays in colours. SynQuiz tests this type of synaesthesia, frequently referred to as grapheme-colour synaesthesia. The first three short quizzes are designed to give you a taste of what synaesthesia might be like and find out whether you might be experiencing it yourself. The fourth full test for letters & numbers gives an indication whether your type of synaesthesia is suitable for the ongoing genetic studies at the Max Planck Institute for Psycholinguistics. If so, you can directly apply and you may be invited later to provide a small sample of saliva (from which we can obtain your DNA). SynQuiz is developed within the Language in Interaction project (a large language-brain research project), in which currently more interesting language apps are being developed. Features: - Three playful quizzes testing synaesthesia for 1) letters and numbers, 2) days of the week, or 3) months of the year. - One longer test for letters & numbers after which you can directly apply for participating in ongoing genetic studies - Post your test scores to social media - Languages: English, German and Dutch
Sentence Monster
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Sentence Monster helps language learners turn vocabulary into sentences they can actually write. Knowing a word is not the same as being able to use it. Sentence Monster gives you short sentence-writing practice, checks your answers, and brings back the words you miss, forget, or still cannot use confidently. Practice with AI-picked sentences tailored to your learning history. Missed, weak, and fading words return through personalized review so you can build active recall instead of only recognizing words. Key features: - Sentence-based vocabulary practice - Personalized review from mistakes and weak words - AI-generated sentence assignments algorithm - Writing feedback for sentence accuracy - Progress and vocabulary insight - Practice across multiple learning languages Sentence Monster is built for learners who freeze when writing, even though they already know many words. Write the sentence, get feedback, and keep repeating the words that need more work. Supported learning languages: English, Korean, Japanese, Chinese, Spanish, French, German, Italian, Portuguese, Dutch, Polish, Turkish, Indonesian, Vietnamese, and Russian. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is update cadence: Sentence Monster at every 3 weeks against SynQuiz's every 31 months. SynQuiz's advantage is iOS requirement (10.0 vs 15.1). 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.
SynQuiz ships an update every 31 months, Sentence Monster every 3 weeks. The most recent releases landed on October 9, 2026 and October 3, 2026 respectively.
| Parameter | SynQuiz | Sentence Monster |
|---|---|---|
| Price | Free | Free |
| Rating | 1.6 (7 ratings) — better | — |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 7 — better | — |
| Update frequency | Every 31 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 10.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 16 MB | 35 MB |
| Age rating | 4+ | 12+ |
| Developer | Radboud University Nijmegen | MINHYEONG YU |
In-app purchases
SynQuiz
No in-app purchases
Sentence Monster
No in-app purchases









