BIGBOX vs Sayello
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
BIGBOX
This app offers a comprehensive English learning experience for children through engaging videos, interactive flashcards, and AI-powered speaking practice. It provides personalized recommendations and progress reports to foster self-motivated learning and boost confidence.
- Extensive video library (10,000+)
- Multimedia flashcards for vocabulary
- AI speaking practice with Monty
- Personalized video recommendations
- Game-like learning system
- Progress reports
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Boost up your kids’ confident in English! BIGBOX is all you need! BIGBOX is a customized educational service that allows users to learn English through watching videos and various mission-based learning. [Features of BIGBOX App] ■ More than 10,000 videos - Engaging videos from popular content providers - 1,300 videos (badanamu, pororo, Tobot, spookiz, and more.) - 1,700 videos of Mcgraw-Hill and Readers series of Joy Cowley - 7.400 YouTube videos selected for students (Sesame Street, Caillou, Super Simple Song, and more) (*Some videos are restricted in some countries.) ■ 3,000 Multimedia flash cards - Learn 90% of the words used in daily conversation - Collecting Word Cards after watching videos - Speaking the words you’ve collected and competing in mini games ■ 1,200 English expressions to boost your fluency - Making sentences based on Word Cards you’ve collected after watching videos and playing mini games - Practice speaking with A.I. friend Monty: Listen & Repeat, Free Talking ■ Why you should use BIGBOX - One-on-one custom video recommendations: Recommendations through the analysis of user’s age, gender, tendency, and study pattern - Self-motivated learning support: Game-like learning system such as a daily mission, word challenge, and more - Personalized progress reports [Awards] - 2019 Bett Awards Finalist, Educational Apps - 2018 Korea Internet Award - a Ministry of Science and ICT Award - 2018 App Awards Korea Education App EduTech – Grand Prize - 2017 e-learning Korea Educational Game - Excellence Award - 2017 Acquired patent for ‘English learning contents recommendation algorithm’ [Subscription Details] - $12.99 payment through for a 1-month subscription. - Paid subscriptions cannot be canceled or refunded according to the App Store policy. [App Access Permissions Notice] * Required Access Permissions BIGBOX provides access only to the essentials of the service, and the items and reasons for the service are listed below. -Save Image Authority: Temporary storage of fairy tale/nursery rhyme thumbnail images -Device ID: Save learning log data (not identifying individuals) -Device/App history: Service optimization and error confirmation ▶Official Site ∙Website : http://www.playbigbox.com ▶ Terms of Service: http://global.playbigbox.com/terms ▶ Privacy Policy: http://global.playbigbox.com/privacy [Contact us] Email: bigbox@wjcompass.com English Education Company, Compass Publishing
Sayello
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수업에서 배운 영어, 실제로 얼마나 말해봤나요? Sayello(세이엘로)는 수업에서 배운 단어와 문장을 AI 선생님과의 1:1 통화로 이어주는 AI 원어민 전화영어예요. 예약 시간이 되면 앱에서 전화처럼 받고, 오늘의 표현으로 5분간 말하기를 시작해요. 아이의 반응에 따라 따라 말하기, 문장 만들기, 자유대화로 맞춤 학습이 진행돼요. 정답을 말하지 못해도, 머뭇거려도 괜찮아요. 아이의 반응별로 다양하게 말하기를 독려하고, 손들기로 한국어 도움을 요청할 수도 있어요. AI 선생님은 아이가 한 말을 듣고 현재 대화의 맥락에 맞춰 다음 질문을 이어가요. 익숙한 표현을 따라 말하는 데서 끝내지 않고, 아이 자신의 이야기로 말해보도록 돕습니다. Sayello에서 할 수 있는 것 - 오늘의 학습 표현과 예정 통화 확인 - AI 선생님과 1:1 실시간 영어 통화 - 아이 수준에 맞춘 단어·문장·자유대화 - 대화가 막히는 순간을 돕는 힌트와 손들기 - 주간 통화 일정과 말하기 기록 확인 수업 후 5분, 배운 표현이 아이의 말이 되는 시간을 만들어보세요. ※ Sayello는 제휴 교육기관 회원을 위한 서비스입니다. 이용을 위해 교육기관에서 제공한 계정 또는 이용 권한이 필요할 수 있습니다.
Screenshots
Verdict
The clearest difference is in-app purchases: Sayello at none against BIGBOX's 10. BIGBOX's advantage is iOS requirement (13.0 vs 15.0). 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. BIGBOX sells 10 one-off in-app purchases. Sayello asks for nothing beyond the download.
BIGBOX ships an update every 2 weeks, Sayello every 9 days. Both last shipped on October 29, 2026.
| Parameter | BIGBOX | Sayello |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (21 ratings) — better | — |
| Positive reviews | 82.1% of reviews | — |
| Number of ratings | 21 — better | — |
| Update frequency | Every 2 weeks | Every 9 days — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 13.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 2.0 GB | 233 MB |
| Age rating | 4+ | 4+ |
| Developer | Woongjin Compass, Co., Ltd. | Hodoo Labs Co., Ltd. |
In-app purchases
BIGBOX
- bigboxTV_90days$13.49
- bigboxTV_180days$26.00
- wordkingdom_90days$27.49
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- readingocean_90days$37.00
- bigboxTV_360days$45.49
- wordkingdom_180days$52.00
- readingocean_180days$70.00
- Reading Ocean's 360-day event.$74.99
- wordkingdom_360days$93.00
- readingocean_360days$125.99
Sayello
No in-app purchases









