# Mechanism Tools Calculator vs SJ To do Manager

The clearest difference is in-app purchases: Mechanism Tools Calculator at none against SJ To do Manager's 5. Mechanism Tools Calculator also leads on ads (none vs shown) and iOS requirement (9.0 vs 16.0). On price and device support there is nothing between them.

Both are free to download. SJ To do Manager sells 5 one-off in-app purchases. Mechanism Tools Calculator asks for nothing beyond the download.

## The numbers

| Metric | Mechanism Tools Calculator | SJ To do Manager |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | — | Every 6 days |
| Size | 56 MB | 4 MB |
| Requires iOS | **9.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Pavan Parekh](https://appshunter.io/developer/1376072714) | [Stephane JAILLIARD](https://appshunter.io/developer/1749751077) |

## What reviewers say

### Mechanism Tools Calculator

[App page](https://appshunter.io/ios/app/mechanism-tools-calculator/id1624924249)

**Features:** macOS Compatibility

**In-app purchases:** none


### SJ To do Manager

[App page](https://appshunter.io/ios/app/sj-to-do-manager/id6642673761)

**Features:** macOS Compatibility

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| A coffee | $0.99 | one-time |
| A cookie | $2.99 | one-time |
| No ads | $4.99 | one-time |
| A lemon tart | $4.99 | one-time |
| A pizza | $9.99 | one-time |


## Frequently asked questions

### Is Mechanism Tools Calculator free?

Mechanism Tools Calculator is free to download, with no in-app purchases.

### Is SJ To do Manager free?

SJ To do Manager is free to download, with in-app purchases available.

### Do Mechanism Tools Calculator or SJ To do Manager have ads?

SJ To do Manager shows ads; Mechanism Tools Calculator does not.

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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.*