# Snake Rules vs Perenne Note. Digital Notebook

The clearest difference is review sentiment: Snake Rules at 100% against Perenne Note. Digital Notebook's 50%. Snake Rules also leads on in-app purchases (none vs 4). Perenne Note. Digital Notebook's advantage is price (Free vs $4.99) and update cadence (weekly vs every 3 weeks). On ads, device support and iOS requirement there is nothing between them.

Perenne Note. Digital Notebook is free to download; Snake Rules costs $4.99 up front. Perenne Note. Digital Notebook sells 4 in-app purchases, starting at $2.99 per month. Snake Rules asks for nothing beyond the download.

Snake Rules ships an update every 3 weeks, Perenne Note. Digital Notebook weekly. The most recent releases landed on September 28, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | Snake Rules | Perenne Note. Digital Notebook |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | — | **[3.8 (5 ratings)](https://appshunter.io/ios/app/perenne-note-digital-notebook/id6758993077/reviews)** |
| Number of ratings | — | **5** |
| Positive reviews | **100.0% of reviews** | 50.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Weekly** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 2 MB | 48 MB |
| Requires iOS | 17.6 | 17.6 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 17+ |
| Developer | [Andre Luiz Rodrigues Costa](https://appshunter.io/developer/1858598247) | [Nicholas Compagnoni](https://appshunter.io/developer/1876200579) |

## What reviewers say

### Snake Rules

[App page](https://appshunter.io/ios/app/snake-rules/id6756125263)

Measure the length of reptiles and other animals from a single photo using a reference object. Track growth, organize records, and export data securely on-device.

**Highlights:** Accurate measurements from photos, Simple point-marking system, Zoom and pan for precision, Save and organize animal data, Growth tracking with charts, Export data to PDF and CSV, Works offline

**Features:** macOS Compatibility

**In-app purchases:** none


### Perenne Note. Digital Notebook

[App page](https://appshunter.io/ios/app/perenne-note-digital-notebook/id6758993077)

A minimalist digital notebook designed for iPad and iPhone, offering a realistic writing and sketching experience with Apple Pencil. Organize notes, sketches, and lists with customizable notebooks and real-time syncing.

**Highlights:** Realistic pen and pencil tools, Customizable notebooks and paper styles, iPhone companion app with iCloud sync, Quick notes with rich text and checklists, Reminders and calendar integration, Desk feature for floating elements, PDF and PNG export options

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $2.99 | per month |
| Annual | $22.99 | per year |
| Single Notebook | $3.99 | one-time |
| Notebook Bundle | $8.99 | one-time |


## Frequently asked questions

### Is Snake Rules free?

Snake Rules costs $4.99, with no in-app purchases.

### Is Perenne Note. Digital Notebook free?

Perenne Note. Digital Notebook is free to download, with in-app purchases available.

### Do Snake Rules or Perenne Note. Digital Notebook have ads?

Neither Snake Rules nor Perenne Note. Digital Notebook shows ads.

### Which is updated more often, Snake Rules or Perenne Note. Digital Notebook?

Snake Rules ships an update every 3 weeks, and Perenne Note. Digital Notebook weekly. Most recently, Snake Rules was updated on September 28, 2026 and Perenne Note. Digital Notebook on October 4, 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.*