Comparison

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.

Head to head
About

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.

Highlights
  • Life Science topics
  • Physical Science topics
  • Earth/Space Science topics
  • Technology and Society
  • US and Canada curriculum alignment
  • Visual learning aids
Features
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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

About

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.

Highlights
  • Animated stories and songs
  • Communicative games
  • CLIL lessons
  • Vocabulary and grammar progression
  • CEFR and YLE alignment
  • World culture lessons
Features
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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

Interactive science 2nd4 screens
Let's Smile 44 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard2 real differences · 7 level
Interactive science 2nd versus Let's Smile 4: the parameters behind the verdict, then further details
ParameterInteractive science 2ndLet's Smile 4
PriceFreeFree
Rating5.0 (1 ratings) — better2.0 (1 ratings)
Number of ratings11
Update frequencyEvery 30 monthsEvery 19 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.110.0 — better
Further details — not scored
Size17 MB914 MB
Age rating4+4+
Developer언어세상e-future Co., Ltd.

Customer experience

Interactive science 2nd

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Let's Smile 4

All ratings1 ratings
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

None

Interactive science 2nd

No in-app purchases

None

Let's Smile 4

No in-app purchases

Questions

Is Interactive science 2nd free?
Interactive science 2nd is free to download, with no in-app purchases.
Is Let's Smile 4 free?
Let's Smile 4 is free to download, with no in-app purchases.
Which has better reviews, Interactive science 2nd or Let's Smile 4?
Interactive science 2nd is rated higher. Interactive science 2nd averages 5.0 out of 5 from 1 ratings, while Let's Smile 4 averages 2.0 from 1 ratings.
Do Interactive science 2nd or Let's Smile 4 have ads?
Neither Interactive science 2nd nor Let's Smile 4 shows ads.
Which is updated more often, Interactive science 2nd or Let's Smile 4?
Interactive science 2nd ships an update every 30 months, and Let's Smile 4 every 19 months. Most recently, Interactive science 2nd was updated on September 28, 2026 and Let's Smile 4 on October 15, 2026.

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