# iSurf BrainView vs TimeTree HD

The clearest difference is rating: iSurf BrainView at 4.1 against TimeTree HD's 1.0. iSurf BrainView also leads on update cadence (every 6 weeks vs every 23 months) and review sentiment (81% vs 63%). TimeTree HD's advantage is iOS requirement (8.0 vs 18.0). On price, ads, in-app purchases and monetization model there is nothing between them.

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

iSurf BrainView holds the better App Store score, 4.1 against 1.0. That said, the two scores are not equally well evidenced: iSurf BrainView has 25 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 81% of iSurf BrainView's written reviews are positive against 63% of TimeTree HD's.

iSurf BrainView ships an update every 6 weeks, TimeTree HD every 23 months. Both last shipped on November 1, 2026.

## The numbers

| Metric | iSurf BrainView | TimeTree HD |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.1 (25 ratings)](https://appshunter.io/ios/app/isurf-brainview/id381072423/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/timetree-hd/id468820058/reviews) |
| Number of ratings | **25** | 1 |
| Positive reviews | **80.8% of reviews** | 62.5% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 6 weeks** | Every 23 months |
| Monetization | Free | Free |
| Size | 11 MB | 66 MB |
| Requires iOS | 18.0 | **8.0** |
| Devices | **iPhone, iPad** | iPad |
| Age rating | 4+ | 4+ |
| Developer | [Netfilter](https://appshunter.io/developer/365306441) | [Arizona and Penn State Universities](https://appshunter.io/developer/372842503) |

## What reviewers say

### iSurf BrainView

[App page](https://appshunter.io/ios/app/isurf-brainview/id381072423)

Explore a real brain MRI slice by slice, with anatomical overlays and interactive identification. Test your knowledge with quizzes and rotate a 3D cortical surface. Works offline with no ads or tracking.

**Highlights:** Slice-by-slice MRI exploration, Anatomical segmentation overlays, Interactive structure identification, Searchable structure list, Anatomy quiz mode, 3D cortical surface viewer, Offline functionality

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

**In-app purchases:** none


### 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


## Frequently asked questions

### Is iSurf BrainView free?

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

### Is TimeTree HD free?

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

### Which has better reviews, iSurf BrainView or TimeTree HD?

iSurf BrainView is rated higher. iSurf BrainView averages 4.1 out of 5 from 25 ratings, while TimeTree HD averages 1.0 from 1 ratings.

### Do iSurf BrainView or TimeTree HD have ads?

Neither iSurf BrainView nor TimeTree HD shows ads.

### Which is updated more often, iSurf BrainView or TimeTree HD?

iSurf BrainView ships an update every 6 weeks, and TimeTree HD every 23 months. Most recently, iSurf BrainView was updated on November 1, 2026 and TimeTree HD on November 1, 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.*