# COPROG Calendar vs Tertiary Planner

The clearest difference is update cadence: Tertiary Planner at every 2 days against COPROG Calendar's fortnightly. COPROG Calendar's advantage is iOS requirement (15.0 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

COPROG Calendar ships an update fortnightly, Tertiary Planner every 2 days. The most recent releases landed on October 15, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | COPROG Calendar | Tertiary Planner |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 2 days** |
| Size | 63 MB | 2 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [COPROG e.K.](https://appshunter.io/developer/1356957127) | [Alfred Ang](https://appshunter.io/developer/1880940227) |

## What reviewers say

### COPROG Calendar

[App page](https://appshunter.io/ios/app/coprog-calendar/id6670216681)

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

**In-app purchases:** none


### Tertiary Planner

[App page](https://appshunter.io/ios/app/tertiary-planner/id6785397240)

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

**In-app purchases:** none


## Frequently asked questions

### Is COPROG Calendar free?

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

### Is Tertiary Planner free?

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

### Do COPROG Calendar or Tertiary Planner have ads?

Neither COPROG Calendar nor Tertiary Planner shows ads.

### Which is updated more often, COPROG Calendar or Tertiary Planner?

COPROG Calendar ships an update fortnightly, and Tertiary Planner every 2 days. Most recently, COPROG Calendar was updated on October 15, 2026 and Tertiary Planner on October 17, 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.*