Comparison

Uncertainty Calculator vs Contagious Disciple Making

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

Head to head
About

Uncertainty Calculator

This app allows users to perform error propagation calculations for mathematical expressions involving uncertain variables. It supports absolute and relative error inputs, various functions, and trigonometric calculations in degrees or radians. The tool helps ensure accurate reporting of results based on estimated errors.

Highlights
  • Error propagation calculations
  • Absolute and relative error input
  • Support for mathematical functions
  • Trigonometric calculations (degrees/radians)
  • Variable combination in expressions
  • Significant figure guidance
Features
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Uncertainty Calculator evaluates the error propagation throughout the mathematical expressions comprised of variables of uncertain value. The application allows input of up to three value-error pairs (A, B and C), that can be used as a parameters in the final expression. Error values should be provided in absolute (100 +/- 5) or in relative format, the latter should appear in percent format (100 +/- 5%). The evaluated expression can include numerous functions, that provided by row of the appropriate buttons. Components and functions can be added directly to the expression field by pressing the corresponding buttons. To encompass expression into the preset formula, select the expression and press the corresponding formula button. Particular attention should be paid to placing brackets to avoid equation ambiguity. The application deals with independent, random errors. So if this is a case never use A + A, but rather 2*A and never A*A*A but rather A^3! Obviously, different parameters can be combined in any way (A+B or C *A^2 .. is perfectly fine). Angles for trigonometric functions can be provided in degrees or radians, and that should be reflected by setting a yellow button to "DEG" or "RAD". Bear in mind the importance of units in any of calculations! Implementation Examples: 1.The charge passing through an electrical circuit is defined by: Q = I * t, where I is the current and t is the time. Calculate the total charge value when a current of 0.15 ± 0.01 A passes through the circuit for 120 ± 1 s: Input: A = 0.15 ± 0.01, B = 120 ± 1 The final expression will be A*B, and press Calculate: The final value will be: 18 ± 1.2 Thus, it can be reported the total charge as 18 C ± 1 C. Important! One should only report as many significant figures as are consistent with estimated error! So the value should be rounded to the rightmost decimal place at which error applies. 2. A ball is tossed straight up into the air with initial speed vo = (4.0± 0.2) m/s. After a time t = (0.60 ± 10%) s, the height of the ball is h = vo*t - 0.5gt^2 = 0.636 m (g = 9.80 m/s^2). What is the value and uncertainty of height? Input: A = vo = 4.0 ± 0.2, and B = t = 0.60 ± 10%, then the final expression should be: A*B – 0.5*9.8*B^2 The final value will be: 0.6 ± 0.4 (meters).

About

Contagious Disciple Making

Access podcasts, videos, and scripture resources to share your faith, guide others into a relationship with Jesus, and build multiplying groups. This app supports the creation of Disciple Making Movements.

Highlights
  • Podcasts
  • Videos
  • Scripture lists
  • Discipleship guidance
  • Group multiplication tools
  • Disciple Making Movement resources
Features
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Podcasts, videos, scripture lists and other resources designed to help you engage people who don't know Jesus, disciple them into a relationship with Him, and establish groups who continue to multiply and become part of a Disciple Making Movement. Mobile app version: 6.24.2

Screenshots

Uncertainty Calculator4 screens
Contagious Disciple Making3 screens

Verdict

The call

The clearest difference is price: Contagious Disciple Making at Free against Uncertainty Calculator's $3.99. Contagious Disciple Making also leads on ratings volume (8 vs 1) and iOS requirement (15.1 vs 17.0). On rating, update cadence, 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

CostPrice · In-app purchases · Ads · Monetization

Contagious Disciple Making is free to download; Uncertainty Calculator costs $3.99 up front. 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 Uncertainty Calculator against 5.0 for Contagious Disciple Making. That said, the two scores are not equally well evidenced: Contagious Disciple Making has 8 ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 3 months. The most recent releases landed on October 29, 2026 and October 25, 2026 respectively.

Scorecard4 real differences · 6 level
Uncertainty Calculator versus Contagious Disciple Making: the parameters behind the verdict, then further details
ParameterUncertainty CalculatorContagious Disciple Making
Price$3.99Free — better
Rating5.0 (1 ratings)5.0 (8 ratings)
Positive reviews—100.0% of reviews
Number of ratings18 — better
Update frequencyEvery 3 monthsEvery 3 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS17.015.1 — better
Further details — not scored
Size1 MB56 MB
Age rating4+4+
DeveloperRoman VolinskyContagious Disciple Making

Customer experience

Uncertainty Calculator

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Contagious Disciple Making

All ratings8 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews3 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Uncertainty Calculator

No in-app purchases

None

Contagious Disciple Making

No in-app purchases

Questions

Is Uncertainty Calculator free?
Uncertainty Calculator costs $3.99, with no in-app purchases.
Is Contagious Disciple Making free?
Contagious Disciple Making is free to download, with no in-app purchases.
Which has better reviews, Uncertainty Calculator or Contagious Disciple Making?
Uncertainty Calculator and Contagious Disciple Making are both rated 5.0 out of 5 on the App Store, from 1 and 8 ratings respectively.
Do Uncertainty Calculator or Contagious Disciple Making have ads?
Neither Uncertainty Calculator nor Contagious Disciple Making shows ads.
Which is updated more often, Uncertainty Calculator or Contagious Disciple Making?
Uncertainty Calculator ships an update every 3 months, and Contagious Disciple Making every 3 months. Most recently, Uncertainty Calculator was updated on October 29, 2026 and Contagious Disciple Making on October 25, 2026.

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