# Callisto Calendar vs Blip Notes

The clearest difference is review sentiment: Callisto Calendar at 60% against Blip Notes's 0%. Callisto Calendar also leads on update cadence (every 2 weeks vs every 9 months) and iOS requirement (16.0 vs 18.0). Blip Notes's advantage is in-app purchases (none vs 1). On price, ads and device support there is nothing between them.

Both are free to download. Callisto Calendar sells 1 one-off in-app purchase. Blip Notes asks for nothing beyond the download.

Callisto Calendar ships an update every 2 weeks, Blip Notes every 9 months. The most recent releases landed on June 1, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | Callisto Calendar | Blip Notes |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.7 (3 ratings)](https://appshunter.io/ios/app/callisto-calendar/id1497394819/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | **60.0% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 9 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 11 MB | 1 MB |
| Requires iOS | **16.0** | 18.0 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Duraid Abdul](https://appshunter.io/developer/1417002529) | [Yan Soisson](https://appshunter.io/developer/1743665280) |

## What reviewers say

### Callisto Calendar

[App page](https://appshunter.io/ios/app/callisto-calendar/id1497394819)

This app helps you organize your schedule with intuitive event creation, powerful search, and multiple calendar views. It offers smart reminder suggestions and integrates astronomical data for planning.

**Highlights:** Natural language event creation, Powerful event search, Event notes and URL editing, Week and Month calendar views, Smart reminder suggestions, Sunset, sunrise, and moon phase data

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Callisto Pro | Free | one-time |


### Blip Notes

[App page](https://appshunter.io/ios/app/blip-notes/id6738626887)

Create notes that automatically disappear after a set time, from hours to weeks. Keep your thoughts organized and clutter-free with a simple interface and customizable colors. Sync across devices with iCloud for seamless access.

**Highlights:** Self-destructing notes, Customizable time limits, Clean, intuitive interface, Customizable colors, iCloud sync, Distraction-free design

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Callisto Calendar free?

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

### Is Blip Notes free?

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

### Do Callisto Calendar or Blip Notes have ads?

Neither Callisto Calendar nor Blip Notes shows ads.

### Which is updated more often, Callisto Calendar or Blip Notes?

Callisto Calendar ships an update every 2 weeks, and Blip Notes every 9 months. Most recently, Callisto Calendar was updated on June 1, 2026 and Blip Notes on September 10, 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.*