TimeTree HD vs Polly Swipe
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
TimeTree HD
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.
- Explore evolutionary timescale
- Thousands of divergence times
- Tree-based hierarchical system
- Search for organism comparisons
- Compute summary statistics
- Data from 2,274 studies
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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.
Polly Swipe
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.
- Swipe-based policy position assessment
- Candidate alignment matching
- Local poll and news summaries
- Anonymous user experience
- Optional one-time purchase for alerts
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Where do you really stand? Polly turns figuring out your politics into a fast, honest, swipe-based experience — no account, no noise, just you and the issues that matter. FIND YOUR POLITICAL MATCH Swipe through 20 real policy positions and react to each one. Polly instantly maps your answers to the candidate who actually aligns with your views, complete with a clear breakdown of where you agree and where you differ. DAILY PULSE Check in on your community. Polly surfaces local polls and AI-generated civic news summaries tailored to your city, so you can see how your neighbors feel and compare local sentiment to the national mood. COMPLETELY ANONYMOUS No sign-up. No email. No tracking you across the internet. Your votes are tied to an anonymous identifier, never your identity. It takes about five minutes and your data stays yours. POLITICAL ALERTS (OPTIONAL) Unlock localized political push notifications with a single one-time purchase — no subscription. Get breaking policy updates and civic alerts for your area, delivered as they happen. Polly is built for curious voters, first-timers, and anyone who wants a clearer picture of their own political identity without the shouting. Privacy Policy: https://kvbt9yolwaacpdumpcx8j-web.rork.live/privacy Terms of Use: https://kvbt9yolwaacpdumpcx8j-web.rork.live/terms
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | TimeTree HD | Polly Swipe |
|---|---|---|
| Price | Free | Free |
| Rating | 1.0 (1 ratings) | 5.0 (3 ratings) — better |
| Positive reviews | 62.5% of reviews | — |
| Number of ratings | 1 | 3 — better |
| Update frequency | Every 23 months | Every 10 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPad | iPhone, iPad, iPod — better |
| Requires iOS | 8.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 66 MB | 42 MB |
| Age rating | 4+ | 17+ |
| Developer | Arizona and Penn State Universities | Eric Myers |
Customer experience
TimeTree HD
Polly Swipe
In-app purchases
TimeTree HD
No in-app purchases
Polly Swipe
- Political Alerts$1.99
Questions
Is TimeTree HD free?
Is Polly Swipe free?
Which has better reviews, TimeTree HD or Polly Swipe?
Do TimeTree HD or Polly Swipe have ads?
Which is updated more often, TimeTree HD or Polly Swipe?
Other comparisons
