# Calendar Pro vs DiagramFlow Studio

The clearest difference is ads: DiagramFlow Studio at none against Calendar Pro's shown. DiagramFlow Studio also leads on iOS requirement (17.0 vs 26.0). On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. Calendar Pro sells 1 one-off in-app purchase and DiagramFlow Studio sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Calendar Pro ships an update monthly, DiagramFlow Studio every 5 weeks. Both last shipped on October 31, 2026.

## The numbers

| Metric | Calendar Pro | DiagramFlow Studio |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/calendar-pro-daily-planner/id6763255448/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Monthly** | Every 5 weeks |
| Monetization | Free with in-app purchases | — |
| Size | 17 MB | 5 MB |
| Requires iOS | 26.0 | **17.0** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 9+ | 4+ |
| Developer | [xita apps](https://appshunter.io/developer/1461041968) | [Yu Shiung Jiang](https://appshunter.io/developer/612234939) |

## What reviewers say

### Calendar Pro

[App page](https://appshunter.io/ios/app/calendar-pro-daily-planner/id6763255448)

This smart calendar and daily planner helps you schedule events faster and easier. It offers natural language event creation, document scanning for event details, and supports multiple calendar systems. Organize your day with customizable categories and sync with your existing Apple Calendar.

**Highlights:** Natural language event creation, AI document scanning for events, Support for six calendar systems, Home screen widgets, Color-coded event categories, Apple Calendar sync, On-device AI processing

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Calendar Pro | $5.99 | one-time |


### DiagramFlow Studio

[App page](https://appshunter.io/ios/app/diagramflow-studio/id6780979641)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 圖流 DiagramFlow Studio Pro 解鎖 | $2.99 | one-time |


## Frequently asked questions

### Is Calendar Pro free?

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

### Is DiagramFlow Studio free?

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

### Do Calendar Pro or DiagramFlow Studio have ads?

Calendar Pro shows ads; DiagramFlow Studio does not.

### Which is updated more often, Calendar Pro or DiagramFlow Studio?

Calendar Pro ships an update monthly, and DiagramFlow Studio every 5 weeks. Most recently, Calendar Pro was updated on October 31, 2026 and DiagramFlow Studio on October 31, 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.*