# The Stack vs Unit Conversion Calculator $

The clearest difference is rating: The Stack at 5.0 against Unit Conversion Calculator $'s 2.0. The Stack also leads on ads (none vs shown) and update cadence (every 5 weeks vs every 9 months). Unit Conversion Calculator $'s advantage is in-app purchases (none vs 3) and iOS requirement (13.0 vs 26.0). On price, ratings volume and device support there is nothing between them.

Both are free to download. The Stack sells 3 one-off in-app purchases. Unit Conversion Calculator $ asks for nothing beyond the download.

The Stack holds the better App Store score, 5.0 against 2.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

The Stack ships an update every 5 weeks, Unit Conversion Calculator $ every 9 months. The most recent releases landed on October 7, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | The Stack | Unit Conversion Calculator $ |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/the-stack-notes-to-self/id6615075283/reviews)** | [2.0 (1 ratings)](https://appshunter.io/ios/app/unit-conversion-calculator/id6742060456/reviews) |
| Number of ratings | 1 | 1 |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | **Every 5 weeks** | Every 9 months |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 12 MB | 28 MB |
| Requires iOS | 26.0 | **13.0** |
| Devices | **iPhone, iPad, Mac, Apple Watch** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Elegant Chaos Limited](https://appshunter.io/developer/1212020544) | [JanoGroup LLC](https://appshunter.io/developer/1781461557) |

## What reviewers say

### The Stack

[App page](https://appshunter.io/ios/app/the-stack-notes-to-self/id6615075283)

This app offers a straightforward approach to managing tasks and capturing thoughts. It utilizes a single list of text-based notes organized with hashtags for easy retrieval and organization.

**Highlights:** Simple text-based notes, Hashtag organization, Easy idea capture, To-do list management, Streamlined interface

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Fresh Straw | $0.99 | one-time |
| A Nice Juicy Carrot | $2.99 | one-time |
| Deluxe Hamster Wheel | $9.99 | one-time |


### Unit Conversion Calculator $

[App page](https://appshunter.io/ios/app/unit-conversion-calculator/id6742060456)

This app offers a comprehensive suite of tools for converting measurements across 14 categories and performing currency exchanges with live rates. It features historical comparisons, favorites, and sharing capabilities, making it useful for various daily tasks.

**Highlights:** 14 measurement conversion categories, Live currency exchange rates, Historical currency rate comparisons, Save favorite conversions, Offline measurement conversions, Metric and imperial units, Light, dark, and system appearance options

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

**In-app purchases:** none


## Frequently asked questions

### Is The Stack free?

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

### Is Unit Conversion Calculator $ free?

Unit Conversion Calculator $ is free to download, with no in-app purchases.

### Which has better reviews, The Stack or Unit Conversion Calculator $?

The Stack is rated higher. The Stack averages 5.0 out of 5 from 1 ratings, while Unit Conversion Calculator $ averages 2.0 from 1 ratings.

### Do The Stack or Unit Conversion Calculator $ have ads?

Unit Conversion Calculator $ shows ads; The Stack does not.

### Which is updated more often, The Stack or Unit Conversion Calculator $?

The Stack ships an update every 5 weeks, and Unit Conversion Calculator $ every 9 months. Most recently, The Stack was updated on October 7, 2026 and Unit Conversion Calculator $ on October 28, 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.*