# TimeTree > Evolutionary timescale and divergence time database for biological organisms. (iPhone/iPad app by Arizona and Penn State Universities.) - Source: https://appshunter.io/ios/app/timetree/id372842500 (this page in markdown: same URL + `.md`) - Developer: [Arizona and Penn State Universities](https://appshunter.io/developer/372842503) - Category: Education, Reference - Price: Free - Rating: 4.00/5 from 10 App Store ratings · 43 written reviews indexed - Age rating: 4+ - Requires: iOS 8.0 · 66 MB - Languages: American English - Released: 2010-06-04 - Data updated: 2026-07-05 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/timetree/id372842500/reviews.md ## What is TimeTree? TimeTree 4 is a public knowledge-base for information on the evolutionary timescale of life. This application allows easy exploration of the thousands of divergence times among organisms in the scientific literature. A tree-based (hierarchical) system is used to identify all published molecular time estimates bearing on the divergence of two chosen organisms, such as species, compute summary statistics, and present the results. Names of two taxa to be compared are entered in the search window and the results are presented on a set of self-explanatory tabs. TimeTree 4 contains data from 2,274 studies including 50,632 species. We will be adding more data in the future as it comes in from researchers. TimeTree 4 requires iOS 8.0 or newer. The TimeTree project is jointly directed by Blair Hedges (Center for Biodiversity, Temple University) and Sudhir Kumar (Institute for Genomics and Evolutionary Medicine, Temple University). This project has been supported, in part, by grants from the National Science Foundation, National Institutes of Health, NASA Astrobiology Institute, and Science Foundation of Arizona. ## Key features - Explore evolutionary timescales - View organism divergence times - Access scientific literature data - Hierarchical tree-based system - Compute summary statistics - Compare species divergence ## Recent user reviews (10 of 43) All indexed reviews: https://appshunter.io/ios/app/timetree/id372842500/reviews.md ### 1/5 — Doesn't work anymore. *2026-04-23, version 4.0* This app no longer works. Please update. ### 1/5 — Server error *2025-10-24, version 4.0* Can’t search anything ### 5/5 — Great tool to have on smart phone *2022-04-23, version 4.0* I appreciate this evidence-based app for helping me to understand the time of divergence of two taxa. For instance, I just found out today that anteaters and aardvarks likely split evolutionarily about 100 million years ago! Not everyone wonders about this, but for those who do, this app is a great reference. ### 4/5 — Needs update for iPhone X *2020-06-14, version 4.0* It’s great, but would be nice if the layout worked for “new” phones. ### 4/5 — Great educational tool *2019-01-04, version 4.0* While the app is somewhat prone to crashing on occasion, it’s a great educational tool for showing how close or distant two organism’s common ancestor is. Despite not being a teacher or officially a biology major myself (yet), I’ve been able to use this app to teach friends about relations between organisms. ### 1/5 — Why can’t I check on the diff between... *2018-08-19, version 4.0* Why can’t I check on the diff between ‘dogs and cats’, or humans and chimpanzees’? ### 1/5 — Crashes instantly *2017-09-15, version 4.0* This app used to be great! I used it on an old iPad 2. I just attempted to use it on the iPad Pro 9" and it cannot even open: just crashes instantly. Please fix it so I can use it with teaching my life science classes... ### 5/5 — cool app!! *2015-10-27, version 4.0* using this app has been helpful. ### 1/5 — Crashes, have to reinstall! *2015-05-04, version 3.1* Please fix! If I misspell one of search terms then app shuts down. Will not refresh & must delete & reinstall. Very lovely on the net! Please fix this glitch in the app! Have iPhone 6+, with all updates. ### 1/5 — Crashes when I try to see the evolutionary relationship between Taxon A and Taxon B *2015-03-04, version 3.1* I recently went of science daily to learn about the new TimeTree of Life Initiative, and I found your app related to this. Unfortunately, whenever I try and see the evolutionary relationship between any two species, the app attempts to calculate and then freezes. Don't get me wrong, I think the app is a great idea, but it needs work ## Frequently asked questions about TimeTree ### What does the TimeTree app do? TimeTree provides a public knowledge base for information on the evolutionary timescale of life. It allows users to explore thousands of divergence times among organisms as found in scientific literature. The app uses a tree-based system to identify molecular time estimates for the divergence of chosen organisms and presents summary statistics. ### What kind of data does TimeTree 4 contain? TimeTree 4 contains data from 2,274 studies, encompassing information on 50,632 species. The project aims to add more data in the future as it becomes available from researchers. ### How do I use TimeTree to compare species? To compare species, you enter the names of the two taxa you wish to compare into the search window. The application will then present the results on a set of self-explanatory tabs, detailing divergence times and related statistics. ### Is TimeTree 4 compatible with my device? TimeTree 4 requires iOS 8.0 or newer to function. Please ensure your device meets this minimum operating system requirement for installation and use. ### Is there a cost to use TimeTree? The TimeTree application is available for free. There are no costs associated with downloading or using the app, and it does not feature in-app purchases or advertisements. ## Version history (last 5 releases) ### 4.0 — 2015-08-03 This app has been updated by Apple to display the Apple Watch app icon. New universal app for iPad and iPhone. New divergence times from over 2000 studies. Numerous bug fixes and server updates. ### 3.1 — 2011-12-15 Calculations have been improved so that the times from any one study do not dominate the overall results. ### 3.0 — 2011-10-05 The results displays have been updated to better reflect the new data. ### 1.0 — 2010-09-13 Inconsistency in the way certain results were displayed have been fixed. ### 0.8 — 2010-06-04 No release notes. ## Apps similar to TimeTree | App | Rating | Price | Category | | --- | --- | --- | --- | | [Animal Class](https://appshunter.io/ios/app/animal-class/id1489554558) | 4.6 (22) | Free | Education | | [Rockd](https://appshunter.io/ios/app/rockd/id1153056624) | 4.4 (183) | Free | Education | | [DeepTime for Geology](https://appshunter.io/ios/app/deeptime-for-geology/id1500200416) | 5.0 (7) | Free | Education | | [Ancient Earth](https://appshunter.io/ios/app/ancient-earth/id509943912) | 4.6 (126) | $2.99 | Education | | [Phylogenetic Tree View](https://appshunter.io/ios/app/phylogenetic-tree-view/id6444221294) | — | Free | Education | | [3D Dinopedia: Paleontology](https://appshunter.io/ios/app/3d-dinopedia-paleontology/id1586806307) | 4.5 (366) | Free | Education | ## More apps by Arizona and Penn State Universities - [TimeTree HD](https://appshunter.io/ios/app/timetree-hd/id468820058) All apps by Arizona and Penn State Universities: https://appshunter.io/developer/372842503 ## Related topics [asurite](https://appshunter.io/ios/topics/asurite) · [bct taxonomy](https://appshunter.io/ios/topics/bct-taxonomy) · [time tree](https://appshunter.io/ios/topics/time-tree) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-05.*