Comparison

Bayes' post vs Contraception

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Calculate post-test probability
  • Input pre-test probability
  • Use test sensitivity
  • Use test specificity
  • Analyze positive results
  • Analyze negative results
Features
Read full description

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

About

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.

Highlights
  • 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
Read full description

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

Bayes' post1 screens
Contraception4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard5 real differences · 5 level
Bayes' post versus Contraception: the parameters behind the verdict, then further details
ParameterBayes' postContraception
PriceFreeFree
Rating3.7 (3 ratings)4.3 (27 ratings) — better
Positive reviews50.0% of reviews63.6% of reviews — better
Number of ratings327 — better
Update frequencyEvery 23 monthsEvery 7 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPod, Apple Watch — betteriPhone, iPad
Requires iOS9.0 — better16.0
Further details — not scored
Size20 MB56 MB
Age rating12+12+
DeveloperKeiji MatsuiCenters For Disease Control and Prevention

Customer experience

Bayes' post

All ratings3 ratings
Positive66.7%
Neutral0.0%
Negative33.3%
Written reviews2 reviews
Positive50.0%
Neutral0.0%
Negative50.0%

Contraception

All ratings27 ratings
Positive81.5%
Neutral7.4%
Negative11.1%
Written reviews11 reviews
Positive63.6%
Neutral9.1%
Negative27.3%

In-app purchases

None

Bayes' post

No in-app purchases

None

Contraception

No in-app purchases

Questions

Is Bayes' post free?
Bayes' post is free to download, with no in-app purchases.
Is Contraception free?
Contraception is free to download, with no in-app purchases.
Which has better reviews, Bayes' post or Contraception?
Contraception is rated higher. Bayes' post averages 3.7 out of 5 from 3 ratings, while Contraception averages 4.3 from 27 ratings.
Do Bayes' post or Contraception have ads?
Neither Bayes' post nor Contraception shows ads.
Which is updated more often, Bayes' post or Contraception?
Bayes' post ships an update every 23 months, and Contraception every 7 months. Most recently, Bayes' post was updated on October 2, 2026 and Contraception on October 17, 2026.

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