# Uncertainty Communication vs Addendum.

The clearest difference is iOS requirement: Uncertainty Communication at 14.0 against Addendum.'s 17.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Uncertainty Communication ships an update fortnightly, Addendum. weekly. The most recent releases landed on October 18, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Uncertainty Communication | Addendum. |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/addendum/id6787558572/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Fortnightly | **Weekly** |
| Monetization | — | Free |
| Size | 122 MB | 2 MB |
| Requires iOS | **14.0** | 17.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 12+ | 4+ |
| Developer | [OSF Healthcare System](https://appshunter.io/developer/1053621635) | [Steven Ermer](https://appshunter.io/developer/6777496728) |

## What reviewers say

### Uncertainty Communication

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

**Features:** macOS Compatibility

**In-app purchases:** none


### Addendum.

[App page](https://appshunter.io/ios/app/addendum/id6787558572)

This private journal helps medical students capture clinical moments for residency applications. It allows for quick note-taking, tagging by theme, and drafting ERAS experiences. The app prioritizes privacy with on-device encryption and offline functionality.

**Highlights:** Capture clinical moments quickly, Tag entries by interview archetypes, Draft ERAS experiences with character counts, Prepare for interviews with STAR stories, Track letters of recommendation, Private, on-device encryption, Offline functionality

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Uncertainty Communication free?

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

### Is Addendum. free?

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

### Do Uncertainty Communication or Addendum. have ads?

Neither Uncertainty Communication nor Addendum. shows ads.

### Which is updated more often, Uncertainty Communication or Addendum.?

Uncertainty Communication ships an update fortnightly, and Addendum. weekly. Most recently, Uncertainty Communication was updated on October 18, 2026 and Addendum. on October 16, 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.*