# Calendoc vs Piece Day

The clearest difference is in-app purchases: Piece Day at none against Calendoc's 2. Calendoc's advantage is device support (3 vs 1). On price, update cadence, ads and iOS requirement there is nothing between them.

Both are free to download. Calendoc sells 2 one-off in-app purchases. Piece Day asks for nothing beyond the download.

Calendoc ships an update weekly, Piece Day every 11 days. The most recent releases landed on November 6, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Calendoc | Piece Day |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Weekly** | Every 11 days |
| Size | 29 MB | 1 MB |
| Requires iOS | 18.0 | **17.0** |
| Devices | **iPhone, iPad, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Toshiki Izumi](https://appshunter.io/developer/1729717097) | [Warm Tech Company](https://appshunter.io/developer/1895279095) |

## What reviewers say

### Calendoc

[App page](https://appshunter.io/ios/app/calendoc-parallel-calendars/id6791646438)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 14-day Trial | Free | one-time |
| Calendoc Pro | $19.99 | one-time |


### Piece Day

[App page](https://appshunter.io/ios/app/piece-day/id6792414283)

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

**In-app purchases:** none


## Frequently asked questions

### Is Calendoc free?

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

### Is Piece Day free?

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

### Do Calendoc or Piece Day have ads?

Neither Calendoc nor Piece Day shows ads.

### Which is updated more often, Calendoc or Piece Day?

Calendoc ships an update weekly, and Piece Day every 11 days. Most recently, Calendoc was updated on November 6, 2026 and Piece Day 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.*