# 태양의 숲 | Solar Forest vs Mental Calculation & Abacus

The clearest difference is ads: 태양의 숲 | Solar Forest at none against Mental Calculation & Abacus's shown. 태양의 숲 | Solar Forest also leads on rating (5.0 vs 4.8) and monetization model (free vs ad-supported). On price, review sentiment, ratings volume and update cadence there is nothing between them.

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

태양의 숲 | Solar Forest holds the better App Store score, 5.0 against 4.8. Both are backed by a comparable volume of ratings — 4 and 4 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

태양의 숲 | Solar Forest ships an update every 7 months, Mental Calculation & Abacus every 6 months. The most recent releases landed on October 10, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | 태양의 숲 | Solar Forest | Mental Calculation & Abacus |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (4 ratings)](https://appshunter.io/ios/app/solar-forest/id1510695084/reviews)** | [4.8 (4 ratings)](https://appshunter.io/ios/app/mental-calculation-and-abacus/id1582407909/reviews) |
| Number of ratings | 4 | 4 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 7 months | **Every 6 months** |
| Monetization | **Free** | Ad-supported |
| Size | 378 MB | 143 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Hanwha Corporation](https://appshunter.io/developer/1081241709) | [Park Jisang](https://appshunter.io/developer/995438886) |

## What reviewers say

### 태양의 숲 | Solar Forest

[App page](https://appshunter.io/ios/app/solar-forest/id1510695084)

Cultivate a vibrant forest by growing saplings with solar energy. Nurture your companion plants with gentle care, enjoy the serene atmosphere of your garden, and discover the healing power of nature.

**Highlights:** Grow saplings with solar energy, Nurture companion plants, Create a beautiful garden, Interact with garden animals, Experience serene music, Build a forest ecosystem

**In-app purchases:** none


### Mental Calculation & Abacus

[App page](https://appshunter.io/ios/app/mental-calculation-and-abacus/id1582407909)

Engage in a fun and educational game designed to enhance mental calculation skills. Learn to use an abacus with an easy-to-follow tutorial and practice with diverse question types.

**Highlights:** Mental calculation practice, Abacus learning tutorial, Variety of practice questions, Suitable for all ages

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is 태양의 숲 | Solar Forest free?

태양의 숲 | Solar Forest is free to download, with no in-app purchases.

### Is Mental Calculation & Abacus free?

Mental Calculation & Abacus is free to download, with no in-app purchases.

### Which has better reviews, 태양의 숲 | Solar Forest or Mental Calculation & Abacus?

태양의 숲 | Solar Forest is rated higher. 태양의 숲 | Solar Forest averages 5.0 out of 5 from 4 ratings, while Mental Calculation & Abacus averages 4.8 from 4 ratings.

### Do 태양의 숲 | Solar Forest or Mental Calculation & Abacus have ads?

Mental Calculation & Abacus shows ads; 태양의 숲 | Solar Forest does not.

### Which is updated more often, 태양의 숲 | Solar Forest or Mental Calculation & Abacus?

태양의 숲 | Solar Forest ships an update every 7 months, and Mental Calculation & Abacus every 6 months. Most recently, 태양의 숲 | Solar Forest was updated on October 10, 2026 and Mental Calculation & Abacus on October 24, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*