World's Key vs Corrsy
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
World's Key
This interactive educational app offers audio-visual lessons and exercises for English and Science curricula for Kindergarten and Primary levels. Students can access engaging content and assessments through an online account, supplementing their printed books.
- Interactive audio-visual lessons
- English and Science curricula
- Kindergarten and Primary levels
- Interactive exercises
- Assessments for lessons
- Online account access
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World's Key application is an interactive educational application for a set of curricula for Kindergarten and Primary Levels in the English language and Science. In our schools, each student receives and uses printed books in his/her class in addition to an online account to access the mentioned application. This application provides students with audio-visual lessons in addition to conducting interactive exercises and assessments to all lessons in both subjects- English and Science. There is no paid services or content. Each student at our schools has a passcode that allow him to access the App content (videos about the lesson and some additional exercises)
Corrsy
An interactive educational app offering private lessons for Iraqi curricula, from middle school to high school. Features engaging videos, concise summaries, and smart tests explained by top Iraqi educators using modern Finnish teaching methods. Ideal for quick revision before exams.
- Interactive private lessons
- Lessons for Iraqi curricula (grades 7-12)
- Taught by top Iraqi educators
- Modern Finnish teaching methods
- Concise and fast-paced lessons
- Engaging educational videos
- Lesson summaries
- Smart comprehension tests
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كورسي هو تطبيق تعليمي تفاعلي يحتوي على دروس خصوصية للمناهج العراقية من الثالث متوسط وللسادس الاعدادي. دروس كورسي مشروحة من قبل افضل الاساتذة العراقيين المدربين على احسن وسائل التعليم الفنلندية الحديثة والمتطورة بحيث الدروس مشروحة بطريقة سهلة وسريعة ولا تاخذ منك وقت طويل ويكون التطبيق هو الحل الامثل من تدرس بليلة الامتحان وماتعرف منين تبدي. اقوى درس عند كورسي هو ١٠ دقائق والنجاح مضمون تطبيق كورسي بالاصدار الحديث بية فيديوهات ممتعة تغنيك عن اليوتيوب, ملخصات للدروس تغنيك عن الملازم, واختبارات ذكية تختبر فهمك تغنيك عن اسئلة السنين السابقة. كل هذا بمكان واحد وبطريقة خرافية يختلف التطبيق عن باقي التطبيقات الاخرى بسبب: ١- محاضراته السريعة والملخصة ٢- مشروحة بطريقة علمية وادوات تقنية حديثة ٣- الاساتذة الاكفاء وطريقة تدريبهم ٤- شكل التطبيقات وخصائصه الشبابية الي تسوي واهس ٥- الملخصات, الفيديوهات, الاختبارات موجودة كلها بمكان واحد نريدك تدرس ويانة بوقت قصير وتاخذ الفكرة من الاخير
Screenshots
Verdict
The clearest difference is rating: Corrsy at 4.4 against World's Key's 3.8. Corrsy also leads on review sentiment (88% vs 55%) and iOS requirement (13.4 vs 16.6). World's Key's advantage is in-app purchases (none vs 6) and ratings volume (317 vs 78). On price, update cadence, ads 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. Corrsy sells 6 one-off in-app purchases. World's Key asks for nothing beyond the download.
Corrsy holds the better App Store score, 4.4 against 3.8. Both are backed by a comparable volume of ratings — 317 and 78 respectively. Written reviews point the same way: 55% of World's Key's written reviews are positive against 88% of Corrsy's.
World's Key ships an update every 8 days, Corrsy weekly. Both last shipped on October 24, 2026.
| Parameter | World's Key | Corrsy |
|---|---|---|
| Price | Free | Free |
| Rating | 3.8 (317 ratings) | 4.4 (78 ratings) — better |
| Positive reviews | 54.5% of reviews | 88.0% of reviews — better |
| Number of ratings | 317 — better | 78 |
| Update frequency | Every 8 days | Weekly — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 16.6 | 13.4 — better |
| Further details — not scored | ||
| Size | 35 MB | 54 MB |
| Age rating | 4+ | 4+ |
| Developer | Mohammad Bzeih | Corrsy Oy Ltd |
Customer experience
World's Key
Corrsy
Bugs and requests
World's Key
Reported bugs
6 issues- App logs out when accessing videos
- App freezes and doesn't calculate views
- App has errors in exam time calculation
- App doesn't open
- App crashes when opening or solving lessons
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- App doesn't show views or solutions
Requested features
5 requests- Add video playback speed control
- Improve app's responsiveness and speed
- Continuous improvement and development of the app
- Fix bugs and glitches
- Update the app to be more modern
Corrsy
Not enough reviews yet to summarise bugs or requests.
In-app purchases
World's Key
No in-app purchases
Corrsy
- Dinar Pack 1$1.59
- Dinar Pack 2$3.89
- Dinar Pack 3$9.99
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- Dinar Pack 5$38.49
- Dinar Pack 4$76.00
- Dinar Pack 6 - 250000$190.99
