# Max Maintenance vs sketchbookDuo

The clearest difference is iOS requirement: Max Maintenance at 13.0 against sketchbookDuo's 16.6. On price, rating, ratings volume and update cadence there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 5.0 for Max Maintenance against 5.0 for sketchbookDuo. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

Max Maintenance ships an update every 3 weeks, sketchbookDuo fortnightly. The most recent releases landed on November 3, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Max Maintenance | sketchbookDuo |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (2 ratings)](https://appshunter.io/ios/app/max-maintenance/id6449554920/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/sketchbookduo/id6745931339/reviews) |
| Number of ratings | **2** | 1 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Fortnightly** |
| Monetization | Free | Free |
| Size | 76 MB | 5 MB |
| Requires iOS | **13.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [NOV Inc.](https://appshunter.io/developer/578550101) | [Tocho Marking Systems, Inc.](https://appshunter.io/developer/1159545791) |

## What reviewers say

### Max Maintenance

[App page](https://appshunter.io/ios/app/max-maintenance/id6449554920)

This mobile tool provides essential asset maintenance information and allows users to manage work orders and material transfers. Its offline functionality ensures productivity in remote areas or locations with poor connectivity.

**Highlights:** Comprehensive asset information access, Execute planned work orders, Create unplanned work orders, Interactive checklists for inspections, Approve material transfers, Offline functionality for continuous work

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

**In-app purchases:** none


### sketchbookDuo

[App page](https://appshunter.io/ios/app/sketchbookduo/id6745931339)

Design, manage, and send marking data to compatible devices. Features a grid-based editor for precise text placement and robust file management for marking jobs. Connects wirelessly for efficient control of marking tasks.

**Highlights:** Grid-based editor, File management, Device connection, Marking control, Customizable grids

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

**In-app purchases:** none


## Frequently asked questions

### Is Max Maintenance free?

Max Maintenance is free to download, with no in-app purchases.

### Is sketchbookDuo free?

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

### Which has better reviews, Max Maintenance or sketchbookDuo?

Max Maintenance and sketchbookDuo are both rated 5.0 out of 5 on the App Store, from 2 and 1 ratings respectively.

### Do Max Maintenance or sketchbookDuo have ads?

Neither Max Maintenance nor sketchbookDuo shows ads.

### Which is updated more often, Max Maintenance or sketchbookDuo?

Max Maintenance ships an update every 3 weeks, and sketchbookDuo fortnightly. Most recently, Max Maintenance was updated on November 3, 2026 and sketchbookDuo on October 30, 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.*