# TimeTree HD vs Ecosystems are Interconnected

The clearest difference is update cadence: TimeTree HD at every 23 months against Ecosystems are Interconnected's every 63 months. TimeTree HD also leads on iOS requirement (8.0 vs 11.0). Ecosystems are Interconnected's advantage is device support (3 vs 1). On price, ads and in-app purchases there is nothing between them.

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

TimeTree HD ships an update every 23 months, Ecosystems are Interconnected every 63 months. The most recent releases landed on October 7, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | TimeTree HD | Ecosystems are Interconnected |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/timetree-hd/id468820058/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 62.5% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 23 months** | Every 63 months |
| Monetization | Free | — |
| Size | 66 MB | 86 MB |
| Requires iOS | **8.0** | 11.0 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Arizona and Penn State Universities](https://appshunter.io/developer/372842503) | [Science Education Institute](https://appshunter.io/developer/1439710468) |

## What reviewers say

### TimeTree HD

[App page](https://appshunter.io/ios/app/timetree-hd/id468820058)

Explore the evolutionary timescale of life with this app. It provides a public knowledge base of divergence times among thousands of organisms, drawing from scientific literature. Easily search for comparisons between species and view summary statistics.

**Highlights:** Explore evolutionary timescale, Thousands of divergence times, Tree-based hierarchical system, Search for organism comparisons, Compute summary statistics, Data from 2,274 studies

**Features:** macOS Compatibility

**In-app purchases:** none


### Ecosystems are Interconnected

[App page](https://appshunter.io/ios/app/ecosystems-are-interconnected/id1439729976)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is TimeTree HD free?

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

### Is Ecosystems are Interconnected free?

Ecosystems are Interconnected is free to download, with no in-app purchases.

### Do TimeTree HD or Ecosystems are Interconnected have ads?

Neither TimeTree HD nor Ecosystems are Interconnected shows ads.

### Which is updated more often, TimeTree HD or Ecosystems are Interconnected?

TimeTree HD ships an update every 23 months, and Ecosystems are Interconnected every 63 months. Most recently, TimeTree HD was updated on October 7, 2026 and Ecosystems are Interconnected on October 12, 2026.

---

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