Comparison

ClassSync vs Thinkbig TOPIK

Price, ratings, monetisation and update history for both apps, side by side β€” with what reviewers say about each.

Head to head
About

ClassSync

Features
Read full description

Simplify Your Class Scheduling Are you a freelance teacher tired of juggling multiple schedules, scrambling to find replacements, and constantly reminding parents about class times? ClassSync is here to simplify your life and empower your teaching. Empower your Students and Parents Give students and parents access to a dedicated app where they can view the schedule, receive notifications, and stay updated on the student progress.

About

Thinkbig TOPIK

Enhance your TOPIK score with AI-powered, customized learning. This app offers structured courses, practice questions, and mock tests tailored to your skill level. Track your progress and review difficult concepts to prepare effectively for the exam.

Highlights
  • AI-based customized learning curriculum
  • 12 courses for TOPIK levels 1-6
  • Practice questions and mock tests
  • Vocabulary and grammar review
  • Writing exercises with feedback
  • Progress tracking and real-time evaluation
  • Multi-language support
Read full description

Best Choice for Improving Your TOPIK Score! β€˜thinkbig TOPIK’, created by Woongjin Thinkbig, Korea's leading educational company in Edutech, rapidly improves your TOPIK score with skill-based, customized AI learning. 1. Systematic learning is possible through 12 courses from 1A to 6B, specifically designed for TOPIK levels 1 to 6. 2. The AI Level Test quickly and easily estimates your TOPIK score while recommending a tailored learning curriculum suited to your abilities. 3. A tailored learning curriculum is provided to match the learner's abilities, making it easy for anyone to study. 1) Today's Learning : With today's video lecture, you can easily understand the concepts through the teacher's explanations. 2) Practice Questions : By solving practice questions, you can become familiar with the types of questions that appear on the TOPIK exam. 3) Vocabulary & Grammar : The main grammar and vocabulary for each lecture topic are covered in detail to help improve your skills. 4) Plus practice questions : Improve your TOPIK score through additional practice questions in listening, reading, and writing. 4. Save difficult questions or words in your personal space during the learning process so you can review them anytime. 1) Review Note : If you "save" the questions you got wrong or want to try again during the learning process, they go straight into your Review Note. 2) Vocabulary list : If you "save" vocabulary or grammar that you haven't fully mastered yet, it goes straight into your vocabulary list. 5. By practicing a variety of writing exercises tailored to your learning level, you'll build confidence in the writing section that once seemed overwhelming. Provide feedback and scores for each TOPIK evaluation criteria for learners' written answers. 6. You can prepare for the TOPIK exam by solving mock tests similar to the actual exam. Real-time evaluation of all sections (listening, reading, writing) and detailed explanations for each question provided. After completing each level's learning course, you can take the corresponding mock test. 7. You can easily track your progress, as the learning completion rate and accuracy rate based on problem-solving are provided in real-time. 8. TOPIK learning is easy and effective with services available in multi-languages.

Screenshots

ClassSync3 screens
Thinkbig TOPIK4 screens

Verdict

The call

The clearest difference is in-app purchases: ClassSync at none against Thinkbig TOPIK's 5. Thinkbig TOPIK's advantage is update cadence (every 2 weeks vs every 9 months). On price, ads, device support and iOS requirement there is nothing between them.

Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS

CostPrice Β· In-app purchases Β· Ads Β· Monetization

Both are free to download. Thinkbig TOPIK sells 5 in-app purchases, starting at $9.99 per month. ClassSync asks for nothing beyond the download.

UpkeepUpdate frequency

ClassSync ships an update every 9 months, Thinkbig TOPIK every 2 weeks. The most recent releases landed on September 18, 2026 and September 28, 2026 respectively.

Scorecard2 real differences Β· 6 level
ClassSync versus Thinkbig TOPIK: the parameters behind the verdict, then further details
ParameterClassSyncThinkbig TOPIK
PriceFreeFree
Positive reviewsβ€”87.5% of reviews
Update frequencyEvery 9 monthsEvery 2 weeks β€” better
AdsNoNo
In-app purchasesNo β€” betterYes
Monetizationβ€”Free with in-app purchases
DevicesiPhone, iPodiPhone, iPad, iPod β€” better
Requires iOS13.012.4 β€” better
Further details β€” not scored
Size30 MB30 MB
Age rating4+17+
DeveloperClasssync TechnologyWoongjin Thinkbig Co., Ltd.

In-app purchases

None

ClassSync

No in-app purchases

5 purchases

Thinkbig TOPIK

Subscriptions2
  • 1-Month Plan Trial7 Days trial$9.991 Month
  • 1-Month Plan$9.991 Month
One-time3
  • 3-Month Plan$44.99
  • 6-Month Plan$77.99
  • 12-Month Plan$118.99

Questions

Is ClassSync free?
ClassSync is free to download, with no in-app purchases.
Is Thinkbig TOPIK free?
Thinkbig TOPIK is free to download, with in-app purchases available.
Do ClassSync or Thinkbig TOPIK have ads?
Neither ClassSync nor Thinkbig TOPIK shows ads.
Which is updated more often, ClassSync or Thinkbig TOPIK?
ClassSync ships an update every 9 months, and Thinkbig TOPIK every 2 weeks. Most recently, ClassSync was updated on September 18, 2026 and Thinkbig TOPIK on September 28, 2026.

Other comparisons