# one plus one automation vs PML Engineer Exam Prep

The clearest difference is price: PML Engineer Exam Prep at Free against one plus one automation's $0.99. one plus one automation's advantage is update cadence (every 2 weeks vs every 3 months) and iOS requirement (9.0 vs 15.0). On ads, in-app purchases and device support there is nothing between them.

PML Engineer Exam Prep is free to download; one plus one automation costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

one plus one automation ships an update every 2 weeks, PML Engineer Exam Prep every 3 months. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | one plus one automation | PML Engineer Exam Prep |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 3 months |
| Monetization | Paid | — |
| Size | 9 MB | 27 MB |
| Requires iOS | **9.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Christian Urff](https://appshunter.io/developer/415894463) | [Davy Raitt](https://appshunter.io/developer/1795318281) |

## What reviewers say

### one plus one automation

[App page](https://appshunter.io/ios/app/one-plus-one-automation/id1488214104)

This app helps children automate addition and subtraction skills. It uses intelligent training methods based on memory principles to reinforce learned tasks and improve recall speed. Designed for children who already understand basic math concepts, it focuses on memorization for more complex calculations.

**Highlights:** Addition and subtraction up to 20, Intelligent training based on memory, Individual learning progress tracking, Written and spoken task presentation, Distraction-free learning environment, Timed challenges for recall speed

**Features:** macOS Compatibility

**In-app purchases:** none


### PML Engineer Exam Prep

[App page](https://appshunter.io/ios/app/pml-engineer-exam-prep/id6757166329)

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

**In-app purchases:** none


## Frequently asked questions

### Is one plus one automation free?

one plus one automation costs $0.99, with no in-app purchases.

### Is PML Engineer Exam Prep free?

PML Engineer Exam Prep is free to download, with no in-app purchases.

### Do one plus one automation or PML Engineer Exam Prep have ads?

Neither one plus one automation nor PML Engineer Exam Prep shows ads.

### Which is updated more often, one plus one automation or PML Engineer Exam Prep?

one plus one automation ships an update every 2 weeks, and PML Engineer Exam Prep every 3 months. Most recently, one plus one automation was updated on November 3, 2026 and PML Engineer Exam Prep on October 31, 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.*