# Mechanical Engineer vs Jiffy

The clearest difference is in-app purchases: Jiffy at none against Mechanical Engineer's 3. Jiffy also leads on update cadence (fortnightly vs every 2 months) and iOS requirement (15.1 vs 17.6). On price, ads and device support there is nothing between them.

Both are free to download. Mechanical Engineer sells 3 in-app purchases, starting at $0.99 per month. Jiffy asks for nothing beyond the download.

Mechanical Engineer ships an update every 2 months, Jiffy fortnightly. The most recent releases landed on September 26, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | Mechanical Engineer | Jiffy |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (8 ratings)](https://appshunter.io/ios/app/mechanical-engineer/id327055140/reviews)** | — |
| Number of ratings | **8** | — |
| Positive reviews | 30.8% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Fortnightly** |
| Monetization | Free with in-app purchases | — |
| Size | 5 MB | 64 MB |
| Requires iOS | 17.6 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Historycentral.com](https://appshunter.io/developer/1744330560) | [Paul Gerard McBrien](https://appshunter.io/developer/1881179090) |

## What reviewers say

### Mechanical Engineer

[App page](https://appshunter.io/ios/app/mechanical-engineer/id327055140)

This app provides over 300 essential mechanical engineering formulas across various domains. It allows users to calculate, save, compare, and share results, aiding in project optimization and decision-making. Users can access a limited number of calculations for free, with a subscription unlocking full functionality.

**Highlights:** Over 300 mechanical engineering formulas, Covers diverse engineering domains, Save and compare formula results, Share calculation outcomes, Intuitive and practical interface, Regular updates based on user input

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $0.99 | per month |
| Pro Quarterly | $0.99 | per 3 months |
| Pro Yearly | $2.99 | per year |


### Jiffy

[App page](https://appshunter.io/ios/app/jiffy-notes-tasks-reminders/id6759848067)

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

**In-app purchases:** none


## Frequently asked questions

### Is Mechanical Engineer free?

Mechanical Engineer is free to download, with in-app purchases available.

### Is Jiffy free?

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

### Do Mechanical Engineer or Jiffy have ads?

Neither Mechanical Engineer nor Jiffy shows ads.

### Which is updated more often, Mechanical Engineer or Jiffy?

Mechanical Engineer ships an update every 2 months, and Jiffy fortnightly. Most recently, Mechanical Engineer was updated on September 26, 2026 and Jiffy on September 19, 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.*