Comparison

SOIL vs ほんやく先生|AI英語翻訳アプリ

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

SOIL

Explore the fascinating world of soil through engaging visuals and informative content. This app delves into the composition, formation, and ecological importance of soil, inspiring curiosity about natural science.

Highlights
  • Detailed soil exploration
  • Natural science education
  • Engaging illustrations
  • Answers common soil questions
  • Bilingual support (Japanese/English)
Features
Read full description

Winner of the Excellence Award in the Education & Kids Category
Best App Award 2024 Dig freely into the ground and explore what lies beneath the soil! “Soil” is a remake based on scenes and landscapes from Let’s Explore Inside the Earth, a representative work by the Japanese picture book author Satoshi Kako, first published in 1975.
With “soil” as its main theme, this work has been newly reimagined with original illustrations created by designer Tsutomu Kakinuma. From the time we are very young, we naturally know that soil exists.
But what exactly is soil? How is it formed? And how does it affect our lives and the lives of other living things?
Perhaps there are not many adults who can explain these things in detail. In this work, you can learn about soil — something that exists almost everywhere around us, yet is often overlooked because it seems so ordinary.
You can also discover many different things connected to soil, such as living creatures, natural phenomena, human production activities, and culture. This work is filled with answers to countless questions — hundreds, even thousands of them.
However, this work is still only a “created world” inside software. The number of living creatures and natural phenomena it can show is far smaller than those found in real nature. So after enjoying this app, we hope you will go outside, look closely at real nature with your own eyes, and feel the difference between the “created world” and the real one. Please note that some small animals and other elements are shown larger than their actual scale, because they would be difficult to see if displayed at their true size. How to Use ◯ Tap the ground to dig a hole. By digging, you can observe what lies beneath the surface. The terrain you dig is saved automatically.
To reset it, please tap the red reset button inside the app.
You can also pinch out to move the viewpoint forward, and pinch in to move it backward. ◯ Tap the “+” button next to the soil name displayed at the top of the screen to view an explanation of the soil. ◯ Tap the magnifying glass icon at the bottom right of the screen to switch to Encyclopedia Mode, where you can check the names of plants and animals. ◯ In Encyclopedia Mode, tap the markers shown on the screen to see the names of the plants or animals connected to them. ◯ Tap the “+” button next to the name of a plant or animal to view its explanation.
To start digging again, tap the shovel icon at the bottom right of the screen. Languages Japanese and English When the OS language setting is changed to English, the language inside the app will also change to English. Supporters NPO Arakawa Clean-aid Forum
Miyata Bussan Co., Ltd. Production Design, Illustration, Text, and Production: Tsutomu Kakinuma
Programming: Keijiro Iwase
Music: Shohei Matsushita / M-Swift
Supervision: Haruo Tanaka, Associate Professor, Soil Science Laboratory, Tokyo University of Agriculture and Technology
Supervision — Nest of the Japanese Black Ant: Toshiyuki Sato, Associate Professor, Animal Behavior Laboratory, Tokyo University of Agriculture and Technology
Supervision and Text — Arakawa River Mouth Stages: Kazuyuki Imamura, Director / Secretary General of Arakawa Clean-aid Forum, Doctor of Engineering
Sound Effects and English Translation: Yuki Horino
English Proofreading: Staff members of Bloomberg L.P. Special Thanks:
Attkun, Fiona san, Joe, Jun, Mitsuharu, Ohashi san, Sakumoto, Shinjuku Mitsubachi Contact oltvects@outlook.com

About

ほんやく先生|AI英語翻訳アプリ

This AI-powered translation app offers seamless English-to-Japanese and Japanese-to-English translations. It allows for in-depth follow-up questions, pronunciation checks, and style adjustments for casual or formal contexts. Save important translations for later review and enjoy privacy with local data storage.

Highlights
  • AI-powered English translation
  • English-Japanese and Japanese-English dictionary
  • Pronunciation check with slow playback
  • Casual/formal and US/UK English switching
  • Voice input support
  • Bookmark saved translations
  • Privacy-focused local data storage
Features
Read full description

ほんやく先生はAI英語翻訳アプリです。 ◆ かんたん翻訳 xxxって英語で何ていうの? xxxを日本語にすると? xxxを埋めるだけでAI英会話講師がネイティブ目線でていねいに翻訳をします。 ◆ 追加質問で深ぼり 「こういう英語表現はどう?」「もっとカジュアルに」「詳しく解説して」などなど、翻訳内容について深ぼり! ◆ 英和・和英を簡単切り替え 日本語から英語、英語から日本語どちらの翻訳もバッチリ。 ◆ 英語の発音をチェック AIが提案してくれた英語表現の発音を再生できます! 「ゆっくり再生」モードにも対応! ◆ カジュアル / フォーマルを1タップ切り替え 「友達との英会話ならカジュアルモードに」「仕事の英会話ならフォーマルモードに」のようにシーンに合わせて切り替え! ◆ アメリカ英語 / イギリス英語を簡単切り替え 旅行先や留学先などのシーンや好みによって切り替えることも! ◆ 音声入力も キーボード入力がめんどうなら音声で入力することも! ◆ ブックマークで後から見返す 「これは覚えておきたい」と思ったらブックマークボタンをぽちっ! ブックマークリストで振り返り学習にも。 英和・和英の辞書代わりに使うのもおすすめです。 ◆ プライバシーに配慮 質問した内容はサーバーに保存されず、あなたのスマホにのみ残ります。 入力内容がAIの学習に利用されるようなことももちろんありません。 安全性やプライバシーが気になる方にもおすすめです。 とにかく「快適に」「楽しく」「実用的に」使えるシンプルな英語翻訳アプリを目指して作られました。 英語学習、外国人友達とのチャット、ビジネス英会話、海外旅行、留学…、さまざまなシーンでご利用ください!

Screenshots

SOIL4 screens
ほんやく先生|AI英語翻訳アプリ4 screens

Verdict

The call

The clearest difference is in-app purchases: SOIL at none against ほんやく先生|AI英語翻訳アプリ's 1. SOIL also leads on iOS requirement (11.0 vs 15.1). ほんやく先生|AI英語翻訳アプリ's advantage is update cadence (fortnightly vs every 3 months) and review sentiment (100% vs 87%). On price, rating, ratings volume 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. ほんやく先生|AI英語翻訳アプリ sells 1 in-app purchase, starting at $1.99 per month. SOIL asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for SOIL against 5.0 for ほんやく先生|AI英語翻訳アプリ. Both are backed by a comparable volume of ratings — 1 and 1 respectively. Written reviews are what separate them: 87% of SOIL's written reviews are positive against 100% of ほんやく先生|AI英語翻訳アプリ's.

UpkeepUpdate frequency

SOIL ships an update every 3 months, ほんやく先生|AI英語翻訳アプリ fortnightly. The most recent releases landed on October 24, 2026 and October 28, 2026 respectively.

Scorecard5 real differences · 5 level
SOIL versus ほんやく先生|AI英語翻訳アプリ: the parameters behind the verdict, then further details
ParameterSOILほんやく先生|AI英語翻訳アプリ
PriceFreeFree
Rating5.0 (1 ratings)5.0 (1 ratings)
Positive reviews86.7% of reviews100.0% of reviews — better
Number of ratings11
Update frequencyEvery 3 monthsFortnightly — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFreemium
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS11.0 — better15.1
Further details — not scored
Size761 MB47 MB
Age rating4+4+
DeveloperAct1 CorporationKioku LLC

Customer experience

SOIL

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews15 reviews
Positive86.7%
Neutral13.3%
Negative0.0%

ほんやく先生|AI英語翻訳アプリ

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews20 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

SOIL

No in-app purchases

1 purchases

ほんやく先生|AI英語翻訳アプリ

Subscriptions1
  • VIPプラン7 Days trial$1.991 Month

Questions

Is SOIL free?
SOIL is free to download, with no in-app purchases.
Is ほんやく先生|AI英語翻訳アプリ free?
ほんやく先生|AI英語翻訳アプリ is free to download, with in-app purchases available.
Which has better reviews, SOIL or ほんやく先生|AI英語翻訳アプリ?
SOIL and ほんやく先生|AI英語翻訳アプリ are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.
Do SOIL or ほんやく先生|AI英語翻訳アプリ have ads?
Neither SOIL nor ほんやく先生|AI英語翻訳アプリ shows ads.
Which is updated more often, SOIL or ほんやく先生|AI英語翻訳アプリ?
SOIL ships an update every 3 months, and ほんやく先生|AI英語翻訳アプリ fortnightly. Most recently, SOIL was updated on October 24, 2026 and ほんやく先生|AI英語翻訳アプリ on October 28, 2026.

Other comparisons