Comparison

OB ToolBox vs Bias Cure

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

Head to head
About

OB ToolBox

This app offers a quick reference for essential medical values related to fetal growth, amniotic fluid, and Doppler indices. It includes calculators for preterm birth prediction, cesarean risk, and risk of stillbirth or miscarriage.

Highlights
  • Fetal growth reference values
  • Estimated fetal weight calculator
  • Amniotic fluid and Doppler indices
  • Bishop score reference
  • Preterm birth predictor
  • Cesarean risk calculator
  • Stillbirth and miscarriage risk calculators
Features
Read full description

OB ToolBox provides a useful and quick reference values for fetal growth, estimated fetal weight, amniotic fluid and doppler indices, Bishop scores, preterm birth predictor, cesarean risk calculator, stillbirth calculator, miscarriage risk calculator, and more.

About

Bias Cure

This app helps medical professionals and patients understand the true probability of a condition after a test result. It clarifies complex statistical concepts, allowing for transparent communication of results and informed decision-making.

Highlights
  • Transparent sequential probability updating
  • Individual 2x2 tables for test interpretation
  • Visual probability trend graph
  • Printable validation PDF with source citations
  • Extensive library of conditions and tests
  • Manual entry of custom diseases and tests
  • Built-in help pages explaining Bayes' theorem
Features
Read full description

Bias Cure supports transparent reasoning. It helps doctors and clinicians correctly interpret and communicate test results to their patients. The chances of having a particular cancer, given a positive test result, are not *at all* the same as the chances of getting a positive test result, given a person has that cancer. This app cuts through that confusion and provides the former number, the probability the patient *really* wants to know. Start with a possible "condition", add one or more test results, and watch the probability of having that condition update step by step. The app includes a an enlarged library of conditions and tests, but users also can enter any disease and diagnostic test manually and edit sensitivity and specificity values freely. The accuracy of the tests in the included library is backed by peer-reviewed research articles cited in the Validation Report, so users can go back to the original sources for more granular detail. Bias Cure includes transparent sequential probability updating, individual 2x2 tables for test interpretation, a visual probability trend graph, and a printable validation PDF that shows the intermediate steps behind the final result along with source citations. Built-in Help pages explain Bayes' theorem, the 2x2 table, and how to enter and interpret test data. Bias Cure is an educational and decision-support aid. It does not provide medical advice, does not replace clinical judgment, and should not be used as the sole basis for diagnosis or treatment decisions.

Screenshots

OB ToolBox4 screens
Bias Cure4 screens

Verdict

The call

The clearest difference is iOS requirement: OB ToolBox at 13.0 against Bias Cure's 17.0. On price, rating, ratings volume and update cadence 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

On the App Store both sit at effectively the same score — 5.0 for OB ToolBox against 5.0 for Bias Cure. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on September 21, 2026 and October 1, 2026 respectively.

Scorecard1 real difference · 8 level
OB ToolBox versus Bias Cure: the parameters behind the verdict, then further details
ParameterOB ToolBoxBias Cure
PriceFreeFree
Rating5.0 (2 ratings)5.0 (1 ratings)
Number of ratings2 — better1
Update frequencyEvery 3 weeksEvery 3 weeks
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS13.0 — better17.0
Further details — not scored
Size56 MB2 MB
Age rating12+17+
DeveloperFrederick BlairTodd Doersch

In-app purchases

None

OB ToolBox

No in-app purchases

None

Bias Cure

No in-app purchases

Questions

Is OB ToolBox free?
OB ToolBox is free to download, with no in-app purchases.
Is Bias Cure free?
Bias Cure is free to download, with no in-app purchases.
Which has better reviews, OB ToolBox or Bias Cure?
OB ToolBox and Bias Cure are both rated 5.0 out of 5 on the App Store, from 2 and 1 ratings respectively.
Do OB ToolBox or Bias Cure have ads?
Neither OB ToolBox nor Bias Cure shows ads.
Which is updated more often, OB ToolBox or Bias Cure?
OB ToolBox ships an update every 3 weeks, and Bias Cure every 3 weeks. Most recently, OB ToolBox was updated on September 21, 2026 and Bias Cure on October 1, 2026.

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