# AgendaAce vs CalStack

The clearest difference is price: AgendaAce at Free against CalStack's $9.99. AgendaAce also leads on iOS requirement (15.1 vs 18.0). CalStack's advantage is in-app purchases (none vs 2) and update cadence (every 8 days vs monthly). On ads there is nothing between them.

AgendaAce is free to download; CalStack costs $9.99 up front. AgendaAce sells 2 in-app purchases, starting at $3.99 per month. CalStack asks for nothing beyond the download.

AgendaAce ships an update monthly, CalStack every 8 days. The most recent releases landed on October 13, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | AgendaAce | CalStack |
| --- | --- | --- |
| Price | **Free** | $9.99 |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Monthly | **Every 8 days** |
| Size | 54 MB | 22 MB |
| Requires iOS | **15.1** | 18.0 |
| Devices | iPhone, iPod | **iPhone, iPad, Mac, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Rstem Sarca](https://appshunter.io/developer/1787669749) | [Pick Two Productions Inc](https://appshunter.io/developer/1860419697) |

## What reviewers say

### AgendaAce

[App page](https://appshunter.io/ios/app/agendaace-calendar-and-planner/id6739958202)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Premium | $3.99 | per month |
| Annual Premium | $39.99 | per year |


### CalStack

[App page](https://appshunter.io/ios/app/calstack/id6789672345)

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

**In-app purchases:** none


## Frequently asked questions

### Is AgendaAce free?

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

### Is CalStack free?

CalStack costs $9.99, with no in-app purchases.

### Do AgendaAce or CalStack have ads?

Neither AgendaAce nor CalStack shows ads.

### Which is updated more often, AgendaAce or CalStack?

AgendaAce ships an update monthly, and CalStack every 8 days. Most recently, AgendaAce was updated on October 13, 2026 and CalStack on October 24, 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.*