# Mailly3 vs Dinosaur Guide.

The clearest difference is in-app purchases: Mailly3 at none against Dinosaur Guide.'s 2. Dinosaur Guide.'s advantage is update cadence (every 3 weeks vs every 12 months) and device support. On price and iOS requirement there is nothing between them.

Both are free to download. Dinosaur Guide. sells 2 in-app purchases, starting at $1.99 per month. Mailly3 asks for nothing beyond the download.

Mailly3 ships an update every 12 months, Dinosaur Guide. every 3 weeks. The most recent releases landed on October 24, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Mailly3 | Dinosaur Guide. |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/dinosaur-guide/id6746718846/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | — | Yes |
| Update frequency | Every 12 months | **Every 3 weeks** |
| Monetization | — | Free with in-app purchases |
| Size | 318 MB | 212 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | — | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Cedric Fry](https://appshunter.io/developer/1177911751) | [Olga Ivanova](https://appshunter.io/developer/1733570435) |

## What reviewers say

### Mailly3

[App page](https://appshunter.io/ios/app/mailly3-4mai/id6499126599)

**In-app purchases:** none


### Dinosaur Guide.

[App page](https://appshunter.io/ios/app/dinosaur-guide/id6746718846)

Explore prehistoric species, fossil discoveries, and scientific classifications offline. This app offers structured profiles with details on size, diet, habitat, and geological periods. Includes learning tools like quizzes and a glossary for enthusiasts and students.

**Highlights:** Dinosaur profiles with classifications, Fossil discovery information, Geological time period details, Offline access, Quiz mode for knowledge testing, Search and category browsing, Favorite dinosaur saving

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| dinosaurs_subscription | $1.99 | per month |
| dinosaurs_by_oliva_donation | $1.99 | one-time |


## Frequently asked questions

### Is Mailly3 free?

Mailly3 is free to download, with no in-app purchases.

### Is Dinosaur Guide. free?

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

### Which is updated more often, Mailly3 or Dinosaur Guide.?

Mailly3 ships an update every 12 months, and Dinosaur Guide. every 3 weeks. Most recently, Mailly3 was updated on October 24, 2026 and Dinosaur Guide. on October 15, 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.*