# Calmetric vs ZenZettel

The clearest difference is in-app purchases: Calmetric at none against ZenZettel's 2. Calmetric also leads on ratings volume (3 vs 1). ZenZettel's advantage is device support (3 vs 1) and iOS requirement (15.1 vs 18.6). On price, rating, update cadence and ads there is nothing between them.

Both are free to download. ZenZettel sells 2 in-app purchases, starting at $0.99 per month. Calmetric asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for Calmetric against 5.0 for ZenZettel. Both are backed by a comparable volume of ratings — 3 and 1 respectively.

Calmetric ships an update monthly, ZenZettel every 2 months. The most recent releases landed on October 16, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | Calmetric | ZenZettel |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (3 ratings)](https://appshunter.io/ios/app/calmetric/id6744656593/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/zenzettel/id6744944376/reviews) |
| Number of ratings | **3** | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Monthly** | Every 2 months |
| Monetization | **Free** | Freemium |
| Size | 6 MB | 41 MB |
| Requires iOS | 18.6 | **15.1** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Piotr Bakker](https://appshunter.io/developer/1741809059) | [Ising Digital Sarl](https://appshunter.io/developer/1685735618) |

## What reviewers say

### Calmetric

[App page](https://appshunter.io/ios/app/calmetric/id6744656593)

Gain practical insights into your calendar year with detailed charts and metrics. Break down any date range to identify optimal times for planning, vacations, and deadlines. Enjoy a private, secure, and ad-free experience with a native iOS design.

**Highlights:** Year progress charts, Date range breakdown, Optimal date identification, Native iOS design, Private and secure experience

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

**In-app purchases:** none


### ZenZettel

[App page](https://appshunter.io/ios/app/zenzettel/id6744944376)

This app helps you build knowledge by transforming fleeting thoughts into permanent insights. It features a minimalist interface inspired by Japanese aesthetics, secure local storage, and AI-powered idea development. Organize your thoughts with smart tagging and advanced filtering.

**Highlights:** Impermanent note capture, AI-powered idea transformation, Advanced filtering, Minimalist interface, Secure local storage, Markdown export

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $0.99 | per month |
| Premium | $9.99 | per year |


## Frequently asked questions

### Is Calmetric free?

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

### Is ZenZettel free?

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

### Which has better reviews, Calmetric or ZenZettel?

Calmetric and ZenZettel are both rated 5.0 out of 5 on the App Store, from 3 and 1 ratings respectively.

### Do Calmetric or ZenZettel have ads?

Neither Calmetric nor ZenZettel shows ads.

### Which is updated more often, Calmetric or ZenZettel?

Calmetric ships an update monthly, and ZenZettel every 2 months. Most recently, Calmetric was updated on October 16, 2026 and ZenZettel on October 12, 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.*