# TimeTree HD vs Polly Swipe

The clearest difference is rating: Polly Swipe at 5.0 against TimeTree HD's 1.0. Polly Swipe also leads on update cadence (every 10 days vs every 23 months) and device support (3 vs 1). TimeTree HD's advantage is in-app purchases (none vs 1) and iOS requirement (8.0 vs 15.1). On price and ads there is nothing between them.

Both are free to download. Polly Swipe sells 1 one-off in-app purchase. TimeTree HD asks for nothing beyond the download.

Polly Swipe holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 1 and 3 respectively.

TimeTree HD ships an update every 23 months, Polly Swipe every 10 days. The most recent releases landed on November 1, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | TimeTree HD | Polly Swipe |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/timetree-hd/id468820058/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/polly-swipe/id6769606027/reviews)** |
| Number of ratings | 1 | **3** |
| Positive reviews | 62.5% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 23 months | **Every 10 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 66 MB | 42 MB |
| Requires iOS | **8.0** | 15.1 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Arizona and Penn State Universities](https://appshunter.io/developer/372842503) | [Eric Myers](https://appshunter.io/developer/1896672764) |

## 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


### Polly Swipe

[App page](https://appshunter.io/ios/app/polly-swipe/id6769606027)

Discover your political alignment through a quick, anonymous swipe-based system. See how your views match candidates and stay informed about local civic news and policy updates.

**Highlights:** Swipe-based policy position assessment, Candidate alignment matching, Local poll and news summaries, Anonymous user experience, Optional one-time purchase for alerts

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Political Alerts | $1.99 | one-time |


## Frequently asked questions

### Is TimeTree HD free?

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

### Is Polly Swipe free?

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

### Which has better reviews, TimeTree HD or Polly Swipe?

Polly Swipe is rated higher. TimeTree HD averages 1.0 out of 5 from 1 ratings, while Polly Swipe averages 5.0 from 3 ratings.

### Do TimeTree HD or Polly Swipe have ads?

Neither TimeTree HD nor Polly Swipe shows ads.

### Which is updated more often, TimeTree HD or Polly Swipe?

TimeTree HD ships an update every 23 months, and Polly Swipe every 10 days. Most recently, TimeTree HD was updated on November 1, 2026 and Polly Swipe on October 31, 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.*