Interactive science 2nd vs Let's Smile 4
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Interactive science 2nd
Explore core science concepts across life, physical, earth, space, and technology. This app uses colorful visuals to make learning easier and deeper, aligning with US and Canadian national curricula.
- Life Science topics
- Physical Science topics
- Earth/Space Science topics
- Technology and Society
- US and Canada curriculum alignment
- Visual learning aids
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- Covers key science topics in Life Science, Physical Science, Earth/Space Science, and Techonology and Society - The contents are based on th national curriculum of the US and Canada - Colorful photographs visualize the key concepts for learners' deeper and easier understanding
Let's Smile 4
This app offers a seven-level primary English course for young EFL learners. It uses engaging stories, songs, and games to build confidence and motivate students. The curriculum aligns with CEFR and YLE test objectives, integrating language learning with various school subjects and global topics.
- Animated stories and songs
- Communicative games
- CLIL lessons
- Vocabulary and grammar progression
- CEFR and YLE alignment
- World culture lessons
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Let’s Smile is a seven-level primary English course for young EFL students. The course has fun and enjoyable stories, songs, and games to support and motivate students to learn English. Language targets are constantly linked and recycled to boost students’ confidence. With Let’s Smile, young students are inspired to smile and succeed together in today’s world. Key Features • Fun animated stories featuring friendly characters • Animated songs and chants • Fun and communicative games • Twelve easy CLIL lessons • Six World Link lessons linked to unit topics • Extensive resources for teachers Components • Student Book • Workbook • Teacher’s Manual • Teacher Flashcards • App • Let’s Smile Online Level Let’s Smile combines steady vocabulary and grammar progression with the functional objectives of the Common European Framework of Reference for Languages (CEFR) and Young Learners English (YLE) Tests. Unit Flow • Words and Grammar: Presents and explores the unit’s target vocabulary and grammar structures • Conversation: Incorporates conversational language and unit targets in an authentic dialog, catchy song, and a collaborative game • CLIL Lesson: Connects the target language to various school subjects for immersion and to demonstrate usefulness • Unit Link: Links the target language with previous units for fun and stress-free consolidation • World Link: Links target language with the world around us through lessons on world cultures, art, ecology, family, and more
Screenshots
Verdict
The clearest difference is rating: Interactive science 2nd at 5.0 against Let's Smile 4's 2.0. Let's Smile 4's advantage is iOS requirement (10.0 vs 15.1). On price, ratings volume, update cadence and ads 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.
Interactive science 2nd holds the better App Store score, 5.0 against 2.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively.
Interactive science 2nd ships an update every 30 months, Let's Smile 4 every 19 months. The most recent releases landed on September 28, 2026 and October 15, 2026 respectively.
| Parameter | Interactive science 2nd | Let's Smile 4 |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | 2.0 (1 ratings) |
| Number of ratings | 1 | 1 |
| Update frequency | Every 30 months | Every 19 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.1 | 10.0 — better |
| Further details — not scored | ||
| Size | 17 MB | 914 MB |
| Age rating | 4+ | 4+ |
| Developer | 언어세상 | e-future Co., Ltd. |
Customer experience
Interactive science 2nd
Let's Smile 4
In-app purchases
Interactive science 2nd
No in-app purchases
Let's Smile 4
No in-app purchases
Questions
Is Interactive science 2nd free?
Is Let's Smile 4 free?
Which has better reviews, Interactive science 2nd or Let's Smile 4?
Do Interactive science 2nd or Let's Smile 4 have ads?
Which is updated more often, Interactive science 2nd or Let's Smile 4?
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