컴시간알리미 vs Chalcack
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
컴시간알리미
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컴시간알리미는 학교 시간표를 스마트폰으로 보여주는 어플리케이션입니다. 학생/학부모의 경우 "학생용 시간표" 탭을, 교사의 경우 "교사용 시간표" 탭을 선택하여 시간표를 열람할 수 있습니다. 우리 학교 시간표를 언제 어디서든 볼 수 있을뿐만 아니라, 시간표가 변경되는 경우에도 바뀐 시간표를 실시간으로 확인할 수 있습니다. 컴시간 일과진행 프로그램을 사용하고 있는 학교의 시간표만 조회 가능합니다. □ 학생용 시간표 - 원하는 학교 이름을 검색하여 선택하면, 해당 학교의 학급 시간표를 열람 가능합니다. □ 교사용 시간표 - 근무하시는 학교 코드를 입력하면 해당 학교에서 근무하는 선생님들의 시간표를 열람 가능합니다. - 학교 코드는 근무하시는 학교의 일과계에게 문의하시기 바랍니다.
Chalcack
This AI-powered app helps students understand homework problems by providing step-by-step explanations in a personalized character's voice. Users can snap photos of any problem, ask follow-up questions, and save solved problems for review. It covers a wide range of subjects and allows for custom character creation.
- AI-powered homework explanations
- Step-by-step problem solving
- Personalized tutor characters
- Custom character creation
- Multi-subject support
- Handwritten problem recognition
- Saved problem review
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Chalcack is an AI homework helper: snap a photo of any problem and the character you picked explains every step, in their own voice. Free for 5 problems a day. Snap math, science, reading or history homework, handwritten or printed. Chalcack gives you the answer, a short summary, every step, and the concept the problem tests. Stuck on a step? Ask your character right there, and keep asking until it clicks. More than 180,000 students study with Chalcack. Study with your crush, not a cold answer key. ■ HOW IT WORKS 1. Snap the problem: handwriting, textbooks, worksheets and practice tests all work. 2. See the answer and why: every step, plus the concept behind it. 3. Ask about any step in the same thread. 4. Review before the test: solved problems are saved by subject. ■ YOUR CHARACTER, YOUR TUTOR • Pick from 7,900+ public characters made by students. • Make your own with a photo, a name and a personality. • Share it with a code and study with the same character as your friends. • Every solution and answer comes in your character's voice. ■ SUBJECTS • Math: pre-algebra, Algebra I & II, geometry, trigonometry, precalculus, calculus, statistics, word problems and proofs. Reads graphs and figures too. • Science: physics, chemistry, biology, earth science, with formulas and units in every step. • Reading & writing: literary devices, main idea, evidence, grammar, essay structure. • English: grammar, vocabulary, reading passages. • History & social studies: U.S. and world history, government, geography, economics. • Test prep: SAT®, ACT® and AP® style questions. ■ FREQUENTLY ASKED QUESTIONS Is Chalcack free? Yes. You get 5 problems and 20 questions free every day, and can watch an ad for more. PRO gives unlimited problems and questions with no ads. Does it read handwritten homework? Yes. Snap equations from your notebook or a problem you're halfway through. Graphs, tables and geometry figures work too. Won't I just copy the answer? Every answer shows the reason for each step, and you can keep asking about any step. Understand it, then try the problem again yourself. Does it explain wrong answer choices? Yes. It shows why the right answer is right and why each other choice doesn't fit. Can I make my own character? Yes. Choose a photo, a name and a personality. Keep it private or make it public for other students. Can AI make mistakes? Sometimes. If an answer looks off, ask your character to double-check, or report it from the solution screen. ■ SUBSCRIPTION INFORMATION • Chalcack PRO: unlimited problems and questions, no ads. • PRO Monthly: $9.99 per month. PRO Yearly: $79.99 per year (about $6.67 a month). Prices may vary by country. • Payment is charged to your Apple ID account at confirmation of purchase. • The subscription renews automatically unless canceled at least 24 hours before the end of the current period. • Manage your subscription and auto-renewal in your App Store account settings. Privacy Policy: https://www.chalcack.com/privacy Terms of Use (EULA): https://www.chalcack.com/terms
Screenshots
Verdict
The clearest difference is review sentiment: Chalcack at 97% against 컴시간알리미's 61%. Chalcack also leads on update cadence (daily vs every 3 weeks) and ratings volume (18 vs 2). 컴시간알리미's advantage is in-app purchases (none vs 4) and rating (5.0 vs 4.8). On price, ads, device support 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. Chalcack sells 4 in-app purchases, starting at $9.99 per month. 컴시간알리미 asks for nothing beyond the download.
컴시간알리미 holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Chalcack has 18 ratings behind it against 2, so its average is the more settled of the two. Written reviews complicate that: 61% of 컴시간알리미's written reviews are positive against 97% of Chalcack's, so the app with the better star average is not the one people write more warmly about.
컴시간알리미 ships an update every 3 weeks, Chalcack daily. Both last shipped on November 12, 2026.
| Parameter | 컴시간알리미 | Chalcack |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) — better | 4.8 (18 ratings) |
| Positive reviews | 61.2% of reviews | 97.4% of reviews — better |
| Number of ratings | 2 | 18 — better |
| Update frequency | Every 3 weeks | Daily — better |
| Ads | Yes | Yes |
| In-app purchases | No — better | Yes |
| Monetization | — | Free with in-app purchases |
| Devices | iPhone | iPhone, iPad — better |
| Requires iOS | 17.0 — better | 18.5 |
| Further details — not scored | ||
| Size | 5 MB | 49 MB |
| Age rating | 4+ | 4+ |
| Developer | 컴시간 | Dong Hae Jang |
Customer experience
컴시간알리미
Chalcack
In-app purchases
컴시간알리미
No in-app purchases
Chalcack
- Monthly Pro (Special Offer)1 Month trial$9.991 Month
- Premium subscription$9.991 Month
- Yearly Pro (Special Offer)1 Year trial$79.991 Year
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- Yearly Premium subscription$79.991 Year









