# Owl Sentry vs InkSpace

The clearest difference is in-app purchases: Owl Sentry at none against InkSpace's 6. Owl Sentry also leads on iOS requirement (13.0 vs 17.0). InkSpace's advantage is update cadence (every 2 weeks vs every 3 months). On price, ads and device support there is nothing between them.

Both are free to download. InkSpace sells 6 one-off in-app purchases. Owl Sentry asks for nothing beyond the download.

Owl Sentry ships an update every 3 months, InkSpace every 2 weeks. The most recent releases landed on September 14, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | Owl Sentry | InkSpace |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.6 (9 ratings)](https://appshunter.io/ios/app/inkspace/id6741228360/reviews)** |
| Number of ratings | — | **9** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 weeks** |
| Monetization | — | Paid |
| Size | 43 MB | 29 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Piotr Zuzak](https://appshunter.io/developer/1468287352) | [Tyler Sherman](https://appshunter.io/developer/598091745) |

## What reviewers say

### Owl Sentry

[App page](https://appshunter.io/ios/app/owl-sentry/id6469431788)

**In-app purchases:** none


### InkSpace

[App page](https://appshunter.io/ios/app/inkspace/id6741228360)

This digital notebook app offers complete creative freedom for note-taking, brainstorming, sketching, and journaling. Customize notebooks with various templates, page styles, and colors. Organize and access notes seamlessly across devices, with offline functionality.

**Highlights:** Unlimited custom notebooks, Write, draw, and sketch with stylus support, Insert custom shapes, text, and media, Searchable tags and bookmarks, Sync across all devices, Offline functionality

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Fitness Pack | $0.99 | one-time |
| Finance Pack | $0.99 | one-time |
| Handwriting Pack | $0.99 | one-time |
| Planner Pack | $0.99 | one-time |
| Teaching Pack | $0.99 | one-time |
| Journal Pack | $0.99 | one-time |


## Frequently asked questions

### Is Owl Sentry free?

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

### Is InkSpace free?

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

### Do Owl Sentry or InkSpace have ads?

Neither Owl Sentry nor InkSpace shows ads.

### Which is updated more often, Owl Sentry or InkSpace?

Owl Sentry ships an update every 3 months, and InkSpace every 2 weeks. Most recently, Owl Sentry was updated on September 14, 2026 and InkSpace on September 21, 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.*