Digit Ratio vs AmGuru
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Digit Ratio
This app allows users to anonymously measure their digit ratios (2D:4D), a marker potentially related to prenatal hormone exposure. It collects data for research purposes, contributing to studies on personality and cognition.
- Anonymous digit ratio measurement
- 2D:4D ratio calculation
- Prenatal hormone exposure marker
- Research data collection
- Personality and cognition studies
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A now widely studied putative marker for prenatal sex hormones exposure or, more precisely, for the relative exposure to testosterone compared to estrogens while in uterus, is the second-to-fourth digit ratio (2D:4D), that is the ratio between the index (2D) and the ring (4D) fingers. Digit-ratio app is a tool to obtain anonymous measurements of digit ratios (2D:4D). Earlier studies that have stood the test of replication have reported that 2D:4D varies by sex and ethnicity but that male 2D:4D tends to be lower than female 2D:4D in all ethnic groups and the effect is strongest in the right hand. These differences emerge prenatally and appear to be stable during the developing years. While a number of failed replications have been reported, 2D:4D appears to be successfully associated with cognitive abilities, impulsivity, aggression and risk-taking, among other effects on personality and cognition. The objective of the research project is to collect anonymous measurements from multiple individuals. The measurements and profile data may be sent to a server for research purposes. No image will be sent.
AmGuru
This mobile learning platform keeps users updated on notifications, courses, and assessments. It requires an active login ID for access. Developed by Firstventure Corporation Pvt Ltd in Mumbai, India.
- Notifications
- Courses
- Assessments
- Mobile learning
- Login required
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The mobile learning solution for users within the First Mile team to be updated on notifications, courses and assessments. This app will require an active login ID. This app is developed by Firstventure Corporation Pvt Ltd, based in Mumbai, India.
Screenshots
Verdict
The clearest difference is update cadence: Digit Ratio at weekly against AmGuru's every 5 months. Digit Ratio also leads on iOS requirement (9.0 vs 15.1). On price, review sentiment, ads and in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.
Digit Ratio ships an update weekly, AmGuru every 5 months. The most recent releases landed on October 24, 2026 and October 20, 2026 respectively.
| Parameter | Digit Ratio | AmGuru |
|---|---|---|
| Price | Free | Free |
| Rating | 1.5 (2 ratings) — better | — |
| Positive reviews | 0.0% of reviews | 0.0% of reviews |
| Number of ratings | 2 — better | — |
| Update frequency | Weekly — better | Every 5 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 9.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 35 MB | 61 MB |
| Age rating | 4+ | 4+ |
| Developer | Everyware Apps | Firstventure Corporation Private Limited |
Customer experience
Digit Ratio
AmGuru
In-app purchases
Digit Ratio
No in-app purchases
AmGuru
No in-app purchases
