# IE Calculator vs Lean Management Toolbox

The clearest difference is in-app purchases: IE Calculator at none against Lean Management Toolbox's 2. IE Calculator also leads on iOS requirement (9.2 vs 13.0). Lean Management Toolbox's advantage is update cadence (every 2 months vs every 10 months). On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. Lean Management Toolbox sells 2 in-app purchases, starting at $5.99 per month. IE Calculator asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for IE Calculator against 5.0 for Lean Management Toolbox. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

IE Calculator ships an update every 10 months, Lean Management Toolbox every 2 months. The most recent releases landed on October 11, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | IE Calculator | Lean Management Toolbox |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/ie-calculator/id1455888355/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/lean-management-toolbox/id1635431415/reviews) |
| Number of ratings | 1 | 1 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 10 months | **Every 2 months** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 16 MB | 89 MB |
| Requires iOS | **9.2** | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Gustavo Sousa](https://appshunter.io/developer/1079985358) | [Denny Hartmann](https://appshunter.io/developer/1635431627) |

## What reviewers say

### IE Calculator

[App page](https://appshunter.io/ios/app/ie-calculator/id1455888355)

This app assists industrial engineers with manufacturing planning by providing tools for production capacity, takt time, and job efficiency calculations. It supports various demand frequencies and helps determine the time needed per unit.

**Highlights:** Production Capacity Calculation, Takt Time Calculation, Actual Jobs Per Hour (JPH), Hours Per Unit (HPU) Calculation, Support for various demand frequencies

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

**In-app purchases:** none


### Lean Management Toolbox

[App page](https://appshunter.io/ios/app/lean-management-toolbox/id1635431415)

Enhance workplace productivity and meeting efficiency with comprehensive audit tools. Identify areas for improvement, manage tasks with a Kanban board, and track progress through detailed reports. Optimize your organization's operations and reduce waste.

**Highlights:** 5S/6S Audit Checklist, Location and Area Management, Kanban Task Management, Audit Reports, Meeting Efficiency Audit, Meeting Cost Counter

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Access - Monthly | $5.99 | per month |
| Premium Access - Yearly | $59.99 | per year |


## Frequently asked questions

### Is IE Calculator free?

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

### Is Lean Management Toolbox free?

Lean Management Toolbox is free to download, with in-app purchases available.

### Which has better reviews, IE Calculator or Lean Management Toolbox?

IE Calculator and Lean Management Toolbox are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.

### Do IE Calculator or Lean Management Toolbox have ads?

Neither IE Calculator nor Lean Management Toolbox shows ads.

### Which is updated more often, IE Calculator or Lean Management Toolbox?

IE Calculator ships an update every 10 months, and Lean Management Toolbox every 2 months. Most recently, IE Calculator was updated on October 11, 2026 and Lean Management Toolbox 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.*