# Notabit vs Duo Messenger

The clearest difference is update cadence: Notabit at every 2 days against Duo Messenger's every 9 days. Duo Messenger's advantage is device support (3 vs 1) and iOS requirement (15.0 vs 17.0). On price, 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.

Notabit ships an update every 2 days, Duo Messenger every 9 days. The most recent releases landed on October 19, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Notabit | Duo Messenger |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[2.3 (3 ratings)](https://appshunter.io/ios/app/duo-messenger/id6503286911/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 days** | Every 9 days |
| Monetization | — | Free |
| Size | 0 MB | 44 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Binariver LTD](https://appshunter.io/developer/1237066705) | [JUSI PTE.LTD.](https://appshunter.io/developer/1659814629) |

## What reviewers say

### Notabit

[App page](https://appshunter.io/ios/app/notabit/id6448895415)

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

**In-app purchases:** none


### Duo Messenger

[App page](https://appshunter.io/ios/app/duo-messenger/id6503286911)

This secure messaging app prioritizes your privacy with end-to-end encryption and anonymous communication. It offers a clean, ad-free experience, allowing you to chat without revealing personal contact information.

**Highlights:** End-to-end message encryption, Anonymous communication via Duo Numbers, No ads or trackers, Private contact information, Secure data safeguarding

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

**In-app purchases:** none


## Frequently asked questions

### Is Notabit free?

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

### Is Duo Messenger free?

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

### Do Notabit or Duo Messenger have ads?

Neither Notabit nor Duo Messenger shows ads.

### Which is updated more often, Notabit or Duo Messenger?

Notabit ships an update every 2 days, and Duo Messenger every 9 days. Most recently, Notabit was updated on October 19, 2026 and Duo Messenger on October 15, 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.*