Bayes' post vs Contraception
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Bayes' post
This medical app calculates the probability of a disease after a diagnostic test. It uses pre-test probability, test sensitivity, and specificity to determine post-test probabilities for both positive and negative results.
- Calculate post-test probability
- Input pre-test probability
- Use test sensitivity
- Use test specificity
- Analyze positive results
- Analyze negative results
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Bayes’ post-test probability calculator, an iPhone / iPod touch application, calculates the post-test probability of diseases from pre-test probability and sensitivity of the test and specificity of the test. positive result: post-test probability for positive result negative result: post-test probability for negative result
Contraception
This app provides comprehensive guidelines on contraceptive method use based on medical eligibility criteria and selected practice recommendations. It assists healthcare providers in counseling individuals and couples on family planning choices, covering over 60 medical conditions and numerous clinical situations.
- U.S. Medical Eligibility Criteria (MEC)
- U.S. Selected Practice Recommendations (SPR)
- Covers over 60 characteristics/conditions
- Addresses numerous clinical situations
- Aids healthcare provider counseling
- Based on CDC Morbidity and Mortality Weekly Report
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The U.S. Medical Eligibility Criteria for Contraceptive Use comprises recommendations for the use of specific contraceptive methods by patients who have certain characteristics or medical conditions. The U.S. Selected Practice Recommendations for Contraceptive Use addresses a select group of common, yet sometimes controversial or complex, issues regarding initiation and use of specific contraceptive methods. The app is developed directly from the CDC Morbidity and Mortality Weekly Report (MMWR) by the Division of Reproductive Health and covers more than 60 characteristics or medical conditions (U.S. MEC) and numerous clinical situations (U.S. SPR). These recommendations are intended to assist healthcare providers when they counsel women, men, and couples about contraceptive method choice and use. Although these recommendations are meant to serve as a source or clinical guidance, healthcare providers should always consider the individual clinical circumstances of each person seeking family planning services.
Screenshots
Verdict
The clearest difference is rating: Contraception at 4.3 against Bayes' post's 3.7. Contraception also leads on update cadence (every 7 months vs every 23 months) and review sentiment (64% vs 50%). Bayes' post's advantage is iOS requirement (9.0 vs 16.0). On price, ads, in-app purchases and monetization model 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.
Contraception holds the better App Store score, 4.3 against 3.7. That said, the two scores are not equally well evidenced: Contraception has 27 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 50% of Bayes' post's written reviews are positive against 64% of Contraception's.
Bayes' post ships an update every 23 months, Contraception every 7 months. The most recent releases landed on October 2, 2026 and October 17, 2026 respectively.
| Parameter | Bayes' post | Contraception |
|---|---|---|
| Price | Free | Free |
| Rating | 3.7 (3 ratings) | 4.3 (27 ratings) — better |
| Positive reviews | 50.0% of reviews | 63.6% of reviews — better |
| Number of ratings | 3 | 27 — better |
| Update frequency | Every 23 months | Every 7 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPod, Apple Watch — better | iPhone, iPad |
| Requires iOS | 9.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 20 MB | 56 MB |
| Age rating | 12+ | 12+ |
| Developer | Keiji Matsui | Centers For Disease Control and Prevention |
Customer experience
Bayes' post
Contraception
In-app purchases
Bayes' post
No in-app purchases
Contraception
No in-app purchases
Questions
Is Bayes' post free?
Is Contraception free?
Which has better reviews, Bayes' post or Contraception?
Do Bayes' post or Contraception have ads?
Which is updated more often, Bayes' post or Contraception?
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