# Uncertainty Calculator vs Contagious Disciple Making

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.

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.

## The numbers

| Metric | Uncertainty Calculator | Contagious Disciple Making |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/uncertainty-calculator/id1170905440/reviews) | [5.0 (8 ratings)](https://appshunter.io/ios/app/contagious-disciple-making/id1579969038/reviews) |
| Number of ratings | 1 | **8** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | Every 3 months |
| Monetization | Paid | **Free** |
| Size | 1 MB | 56 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Roman Volinsky](https://appshunter.io/developer/977951850) | [Contagious Disciple Making](https://appshunter.io/developer/1579969040) |

## What reviewers say

### Uncertainty Calculator

[App page](https://appshunter.io/ios/app/uncertainty-calculator/id1170905440)

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:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Contagious Disciple Making

[App page](https://appshunter.io/ios/app/contagious-disciple-making/id1579969038)

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:** Vision Pro support

**In-app purchases:** none


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*