# Deer vs iThinkAir

The clearest difference is update cadence: Deer at every 9 days against iThinkAir's monthly. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Deer sells 3 in-app purchases, starting at $0.99 per month and iThinkAir sells 2 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Deer ships an update every 9 days, iThinkAir monthly. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Deer | iThinkAir |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (6 ratings)](https://appshunter.io/ios/app/deer-note-outline-mindmap/id1509262785/reviews)** | — |
| Number of ratings | **6** | — |
| Positive reviews | 88.9% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 9 days** | Monthly |
| Monetization | Free with in-app purchases | — |
| Size | 11 MB | 79 MB |
| Requires iOS | **15** | 15.6 |
| Devices | iPhone, iPad, iPod, Mac | iPhone, iPad, iPod, Mac |
| Age rating | 4+ | 4+ |
| Developer | [佳文 潘](https://appshunter.io/developer/1312631799) | [燕锋 林](https://appshunter.io/developer/691726316) |

## What reviewers say

### Deer

[App page](https://appshunter.io/ios/app/deer-note-outline-mindmap/id1509262785)

This app offers structured note-taking with features to reorder lines, convert notes to outlines, and generate mind maps. It helps organize complex information and newly learned knowledge points for clearer understanding.

**Highlights:** Freely reorder notes by line, One-click outline conversion, One-click mind map generation, Drag and drop paragraph reordering, Clearer structure visualization

**Features:** Family Sharing, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Subscription Monthly | $0.99 | per month |
| Subscription Yearly | $5.99 | per year |
| Lifetime VIP | $9.99 | one-time |


### iThinkAir

[App page](https://appshunter.io/ios/app/ithinkair-aiai/id1633024639)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 会员年费 | $59.99 | one-time |
| 超级会员年费 | $94.99 | one-time |


## Frequently asked questions

### Is Deer free?

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

### Is iThinkAir free?

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

### Do Deer or iThinkAir have ads?

Neither Deer nor iThinkAir shows ads.

### Which is updated more often, Deer or iThinkAir?

Deer ships an update every 9 days, and iThinkAir monthly. Most recently, Deer was updated on October 24, 2026 and iThinkAir 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.*