# Uncertainty Communication vs Step Gunner

The clearest difference is in-app purchases: Uncertainty Communication at none against Step Gunner's 2. Uncertainty Communication also leads on iOS requirement (14.0 vs 17.0). Step Gunner's advantage is update cadence (every 4 days vs fortnightly). On price, ads and device support there is nothing between them.

Both are free to download. Step Gunner sells 2 in-app purchases, starting at $9.99 per month. Uncertainty Communication asks for nothing beyond the download.

Uncertainty Communication ships an update fortnightly, Step Gunner every 4 days. The most recent releases landed on September 14, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | Uncertainty Communication | Step Gunner |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.8 (23 ratings)](https://appshunter.io/ios/app/step-gunner/id6761317357/reviews)** |
| Number of ratings | — | **23** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 4 days** |
| Monetization | — | Freemium |
| Size | 122 MB | 144 MB |
| Requires iOS | **14.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 12+ | 17+ |
| Developer | [OSF Healthcare System](https://appshunter.io/developer/1053621635) | [Rezumab LLC](https://appshunter.io/developer/1873578655) |

## What reviewers say

### Uncertainty Communication

[App page](https://appshunter.io/ios/app/uncertainty-communication/id1460824438)

**Features:** macOS Compatibility

**In-app purchases:** none


### Step Gunner

[App page](https://appshunter.io/ios/app/step-gunner/id6761317357)

Master high-yield content for USMLE Step 2 CK with smart spaced repetition, timed challenges, and AI-powered explanations. This app offers clinical case simulations and a question bank designed for efficient medical student study.

**Highlights:** Spaced repetition system, Clinical case simulations, High-yield question bank, Timed challenges, AI-powered explanations, Progress tracking and leaderboards

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Step Gunner Pro Monthly | $9.99 | per month |
| Step Gunner Pro Yearly | $79.99 | per year |


## Frequently asked questions

### Is Uncertainty Communication free?

Uncertainty Communication is free to download, with no in-app purchases.

### Is Step Gunner free?

Step Gunner is free to download, with in-app purchases available.

### Do Uncertainty Communication or Step Gunner have ads?

Neither Uncertainty Communication nor Step Gunner shows ads.

### Which is updated more often, Uncertainty Communication or Step Gunner?

Uncertainty Communication ships an update fortnightly, and Step Gunner every 4 days. Most recently, Uncertainty Communication was updated on September 14, 2026 and Step Gunner on September 19, 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.*