# CalStack vs I Saved This. Why?

The clearest difference is price: I Saved This. Why? at Free against CalStack's $9.99. CalStack's advantage is device support (4 vs 1) and iOS requirement (18.0 vs 26.6). On update cadence, ads and in-app purchases there is nothing between them.

I Saved This. Why? is free to download; CalStack costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Both ship on a similar rhythm, roughly every 5 days. The most recent releases landed on October 9, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | CalStack | I Saved This. Why? |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/i-saved-this-why/id6814026693/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 days | Every 5 days |
| Monetization | — | Free |
| Size | 20 MB | 2 MB |
| Requires iOS | **18.0** | 26.6 |
| Devices | **iPhone, iPad, Mac, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Pick Two Productions Inc](https://appshunter.io/developer/1860419697) | [Hiroyuki Shibata](https://appshunter.io/developer/1891872735) |

## What reviewers say

### CalStack

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

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

**In-app purchases:** none


### I Saved This. Why?

[App page](https://appshunter.io/ios/app/i-saved-this-why/id6814026693)

This app analyzes your saved screenshots to identify the reason you saved them. It helps you turn that information into actionable items like calendar events, reminders, or saved notes. Designed for simplicity, speed, and privacy, it processes data directly on your device.

**Highlights:** Screenshot text analysis, Calendar event creation, Reminder creation, Map integration, Information saving, On-device processing, Privacy focused

**In-app purchases:** none


## Frequently asked questions

### Is CalStack free?

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

### Is I Saved This. Why? free?

I Saved This. Why? is free to download, with no in-app purchases.

### Do CalStack or I Saved This. Why? have ads?

Neither CalStack nor I Saved This. Why? shows ads.

### Which is updated more often, CalStack or I Saved This. Why??

CalStack ships an update every 5 days, and I Saved This. Why? every 5 days. Most recently, CalStack was updated on October 9, 2026 and I Saved This. Why? on October 11, 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.*