# Estratum vs Reteum

The clearest difference is iOS requirement: Estratum at 18.0 against Reteum's 26.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Estratum sells 2 one-off in-app purchases and Reteum sells 1 in-app purchase, starting at $24.99 per year. Whichever you choose, the download price is not the number that matters.

Estratum ships an update every 10 days, Reteum weekly. The most recent releases landed on November 10, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | Estratum | Reteum |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 10 days | **Weekly** |
| Size | 29 MB | 182 MB |
| Requires iOS | **18.0** | 26.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [LyXeoN](https://appshunter.io/developer/566849105) | [智文 石](https://appshunter.io/developer/6820325008) |

## What reviewers say

### Estratum

[App page](https://appshunter.io/ios/app/estratum-second-brain/id6795179990)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 14-day Trial | Free | one-time |
| Estratum Pro — Lifetime | $17.99 | one-time |


### Reteum

[App page](https://appshunter.io/ios/app/reteum-private-notes-and-ideas/id6820520573)

**Features:** iPhone Duo support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Reteum Pro | $24.99 | per year |


## Frequently asked questions

### Is Estratum free?

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

### Is Reteum free?

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

### Do Estratum or Reteum have ads?

Neither Estratum nor Reteum shows ads.

### Which is updated more often, Estratum or Reteum?

Estratum ships an update every 10 days, and Reteum weekly. Most recently, Estratum was updated on November 10, 2026 and Reteum on November 6, 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.*