Uncertainty Calculator vs Contagious Disciple Making
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Error propagation calculations
- Absolute and relative error input
- Support for mathematical functions
- Trigonometric calculations (degrees/radians)
- Variable combination in expressions
- Significant figure guidance
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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).
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.
- Podcasts
- Videos
- Scripture lists
- Discipleship guidance
- Group multiplication tools
- Disciple Making Movement resources
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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
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Verdict
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
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.
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.
Both ship on a similar rhythm, roughly every 3 months. The most recent releases landed on October 29, 2026 and October 25, 2026 respectively.
| Parameter | Uncertainty Calculator | Contagious Disciple Making |
|---|---|---|
| Price | $3.99 | Free — better |
| Rating | 5.0 (1 ratings) | 5.0 (8 ratings) |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | 1 | 8 — better |
| Update frequency | Every 3 months | Every 3 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17.0 | 15.1 — better |
| Further details — not scored | ||
| Size | 1 MB | 56 MB |
| Age rating | 4+ | 4+ |
| Developer | Roman Volinsky | Contagious Disciple Making |
Customer experience
Uncertainty Calculator
Contagious Disciple Making
In-app purchases
Uncertainty Calculator
No in-app purchases
Contagious Disciple Making
No in-app purchases
Questions
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