# Structured Outliner vs Nubble Notes

The clearest difference is in-app purchases: Nubble Notes at none against Structured Outliner's 1. Nubble Notes also leads on ads (none vs shown) and iOS requirement (15.0 vs 17.0). On price, update cadence and device support there is nothing between them.

Both are free to download. Structured Outliner sells 1 one-off in-app purchase. Nubble Notes asks for nothing beyond the download.

Structured Outliner ships an update every 9 days, Nubble Notes every 5 days. The most recent releases landed on September 19, 2026 and September 8, 2026 respectively.

## The numbers

| Metric | Structured Outliner | Nubble Notes |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/nubble-notes-mind-map-and-ideas/id6797114391/reviews)** |
| Number of ratings | — | **2** |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 9 days | **Every 5 days** |
| Monetization | — | Free |
| Size | 6 MB | 5 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Felipe Carraro](https://appshunter.io/developer/1887606432) | [ADAM JIANG LAI](https://appshunter.io/developer/6797114393) |

## What reviewers say

### Structured Outliner

[App page](https://appshunter.io/ios/app/structured-outliner/id6761066639)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Version | $7.99 | one-time |


### Nubble Notes

[App page](https://appshunter.io/ios/app/nubble-notes-mind-map-and-ideas/id6797114391)

Organize your thoughts visually with interconnected bubbles. Nest notes and ideas, tag them with confidence levels, and link related concepts. This app allows for flexible organization that adapts to your thinking process.

**Highlights:** Visual bubble organization, Nested notes and bubbles, Multi-bubble note placement, Confidence tagging system, Linked idea connections, Password-protected private bubbles, Import and search functionality

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

**In-app purchases:** none


## Frequently asked questions

### Is Structured Outliner free?

Structured Outliner is free to download, with in-app purchases available.

### Is Nubble Notes free?

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

### Do Structured Outliner or Nubble Notes have ads?

Structured Outliner shows ads; Nubble Notes does not.

### Which is updated more often, Structured Outliner or Nubble Notes?

Structured Outliner ships an update every 9 days, and Nubble Notes every 5 days. Most recently, Structured Outliner was updated on September 19, 2026 and Nubble Notes on September 8, 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.*