# Check Calendar vs PaperUno

The clearest difference is in-app purchases: PaperUno at none against Check Calendar's 1. Check Calendar's advantage is update cadence (every 2 days vs every 2 weeks). On price, ads, device support and iOS requirement there is nothing between them.

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

Check Calendar ships an update every 2 days, PaperUno every 2 weeks. The most recent releases landed on September 24, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | Check Calendar | PaperUno |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (1.5K ratings)](https://appshunter.io/ios/app/check-calendar-habit-tracker/id1563837295/reviews)** | — |
| Number of ratings | **1.5K** | — |
| Positive reviews | 51.9% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 days** | Every 2 weeks |
| Monetization | Free with in-app purchases | — |
| Size | 58 MB | 71 MB |
| Requires iOS | **15.1** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [naoki otsu](https://appshunter.io/developer/1082476153) | [炯炯 胡](https://appshunter.io/developer/1774315636) |

## What reviewers say

### Check Calendar

[App page](https://appshunter.io/ios/app/check-calendar-habit-tracker/id1563837295)

Easily track your daily habits by marking them on a calendar. Add notes, customize with emojis, and view progress reports. Offers features like reminders, data backup, and biometric security for a private and convenient experience.

**Highlights:** One-tap calendar checks, Add notes to entries, Unlimited habit categories, Customizable emojis, Progress reports and graphs, Daily reminders, Biometric authentication

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium (Pay Once) | $4.99 | one-time |

**What reviewers like**

- 👍 Simple and easy to use
- ✅ Effective for tracking habits
- 📅 Convenient calendar view
- 🎨 Customizable icons and emojis

**What reviewers complain about**

- 💰 Paid app with limited free trial
- 🔒 Lack of free version options
- 🔄 Data loss on device change
- 🤔 Unclear pricing and subscription model

**Reported bugs**

- Inconsistent date tracking
- Syncing issues between devices
- Unexpected loss of data and progress

**Requested features**

- Add widget support
- Implement reminder/notification system
- Provide more data visualization and analytics
- Allow selective clearing of check marks


### PaperUno

[App page](https://appshunter.io/ios/app/paperuno-grid-and-graph-maker/id6784046887)

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

**In-app purchases:** none


## Frequently asked questions

### Is Check Calendar free?

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

### Is PaperUno free?

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

### Do Check Calendar or PaperUno have ads?

Neither Check Calendar nor PaperUno shows ads.

### Which is updated more often, Check Calendar or PaperUno?

Check Calendar ships an update every 2 days, and PaperUno every 2 weeks. Most recently, Check Calendar was updated on September 24, 2026 and PaperUno on September 18, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*