# HEIR vs Dinosaur Guide.

The clearest difference is review sentiment: Dinosaur Guide. at 100% against HEIR's 33%. Dinosaur Guide. also leads on rating (5.0 vs 3.0) and update cadence (every 3 weeks vs every 6 months). HEIR's advantage is in-app purchases (none vs 2) and ads (none vs shown). On price, ratings volume and device support there is nothing between them.

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

Dinosaur Guide. holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively. Written reviews point the same way: 33% of HEIR's written reviews are positive against 100% of Dinosaur Guide.'s.

HEIR ships an update every 6 months, Dinosaur Guide. every 3 weeks. The most recent releases landed on November 1, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | HEIR | Dinosaur Guide. |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.0 (1 ratings)](https://appshunter.io/ios/app/heir-historic-environment-image-resource/id989286250/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/dinosaur-guide/id6746718846/reviews)** |
| Number of ratings | 1 | 1 |
| Positive reviews | 33.3% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 6 months | **Every 3 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 30 MB | 212 MB |
| Requires iOS | **6.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Keepthinking Limited](https://appshunter.io/developer/989286249) | [Olga Ivanova](https://appshunter.io/developer/1733570435) |

## What reviewers say

### HEIR

[App page](https://appshunter.io/ios/app/heir-historic-environment-image-resource/id989286250)

Explore thousands of historic photographs and compare them to present-day views. Help researchers track environmental and climate change by re-photographing historical sites and contributing to a global database.

**Highlights:** Access thousands of historic images, Overlay feature for re-photography, Track environmental and heritage change, Contribute to a global database, Explore past and present landscapes

**Features:** macOS Compatibility

**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 HEIR free?

HEIR 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 has better reviews, HEIR or Dinosaur Guide.?

Dinosaur Guide. is rated higher. HEIR averages 3.0 out of 5 from 1 ratings, while Dinosaur Guide. averages 5.0 from 1 ratings.

### Do HEIR or Dinosaur Guide. have ads?

Dinosaur Guide. shows ads; HEIR does not.

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

HEIR ships an update every 6 months, and Dinosaur Guide. every 3 weeks. Most recently, HEIR was updated on November 1, 2026 and Dinosaur Guide. on October 30, 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.*