# Earth Explore vs lemma

The clearest difference is in-app purchases: Earth Explore at none against lemma's 3. lemma's advantage is ads (none vs shown). On price, rating, ratings volume and device support there is nothing between them.

Both are free to download. lemma sells 3 in-app purchases, starting at $6.99 per 7 days. Earth Explore asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for Earth Explore against 5.0 for lemma. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

## The numbers

| Metric | Earth Explore | lemma |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/earth-explore/id1632933059/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/lemma-comp-math-trainer/id6770669166/reviews) |
| Number of ratings | 1 | 1 |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | — | Every 3 days |
| Monetization | **Ad-supported** | Free with in-app purchases |
| Size | 104 MB | 31 MB |
| Requires iOS | 15.5 | **15.1** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Cameron Ryan](https://appshunter.io/developer/1647641707) | [Roger You](https://appshunter.io/developer/1804598101) |

## What reviewers say

### Earth Explore

[App page](https://appshunter.io/ios/app/earth-explore/id1632933059)

Identify bird songs using artificial intelligence with this application. It can classify over 2000 bird species globally, all processed directly on your device without an internet connection.

**Highlights:** AI-powered bird song classification, Supports over 2000 bird species, Offline functionality, On-device processing, Global bird song database

**In-app purchases:** none


### lemma

[App page](https://appshunter.io/ios/app/lemma-comp-math-trainer/id6770669166)

This app provides focused, daily practice for quantitative interviews, featuring timed sprints of math and probability problems. It tracks your skill across disciplines with adaptive difficulty and offers hints and solutions to help you improve. Designed for those preparing for trading firm interviews or seeking to build a quantitative thinking habit.

**Highlights:** Daily timed problem sprints, Per-category ELO skill tracking, Adaptive difficulty, Hints and step-through solutions, Streaks, XP, and achievements, Leaderboard

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lemma Premium | $6.99 | per 7 days |
| Lemma Premium | $9.99 | per month |
| Lemma Premium | $59.99 | per year |


## Frequently asked questions

### Is Earth Explore free?

Earth Explore is free to download, with no in-app purchases.

### Is lemma free?

lemma is free to download, with in-app purchases available.

### Which has better reviews, Earth Explore or lemma?

Earth Explore and lemma are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.

### Do Earth Explore or lemma have ads?

Earth Explore shows ads; lemma does not.

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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.*