# Noteflow vs ISSY Sentry

The clearest difference is iOS requirement: Noteflow at 12.4 against ISSY Sentry's 15.1. 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.

Noteflow ships an update every 6 weeks, ISSY Sentry every 2 months. The most recent releases landed on October 6, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | Noteflow | ISSY Sentry |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.2 (182 ratings)](https://appshunter.io/ios/app/noteflow-simple-notes/id1252732105/reviews)** | — |
| Number of ratings | **182** | — |
| Positive reviews | 46.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 6 weeks** | Every 2 months |
| Monetization | Free | — |
| Size | 14 MB | 26 MB |
| Requires iOS | **12.4** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Qrayon, LLC](https://appshunter.io/developer/354980265) | [JOSUE LUIS BUESO RIVERA](https://appshunter.io/developer/1859450125) |

## What reviewers say

### Noteflow

[App page](https://appshunter.io/ios/app/noteflow-simple-notes/id1252732105)

This app offers a digital notebook experience designed to replace pen and paper. It allows for note-taking, PDF annotation, sketching, and freeform idea capture with vector ink that scales without quality loss. Seamlessly integrate real-world content and organize your thoughts digitally.

**Highlights:** Digital notebook replacement for pen and paper, Annotate PDFs and sketch freely, Convert real-world images to vector ink, Fluid editing without traditional layers, Drag-and-drop integration with iOS, Cloud storage synchronization

**Features:** Vision Pro support

**In-app purchases:** none


### ISSY Sentry

[App page](https://appshunter.io/ios/app/issy-sentry/id6756495508)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Noteflow free?

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

### Is ISSY Sentry free?

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

### Do Noteflow or ISSY Sentry have ads?

Neither Noteflow nor ISSY Sentry shows ads.

### Which is updated more often, Noteflow or ISSY Sentry?

Noteflow ships an update every 6 weeks, and ISSY Sentry every 2 months. Most recently, Noteflow was updated on October 6, 2026 and ISSY Sentry on September 30, 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.*