# P.M.M.D Calculator vs Voltix

The clearest difference is price: Voltix at Free against P.M.M.D Calculator's $3.99. Voltix also leads on update cadence (every 3 weeks vs every 22 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Voltix is free to download; P.M.M.D Calculator costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

P.M.M.D Calculator ships an update every 22 months, Voltix every 3 weeks. The most recent releases landed on October 16, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | P.M.M.D Calculator | Voltix |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | — | **[2.0 (101 ratings)](https://appshunter.io/ios/app/voltix/id6739192867/reviews)** |
| Number of ratings | — | **101** |
| Positive reviews | — | 10.8% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 22 months | **Every 3 weeks** |
| Monetization | — | Free |
| Size | 1 MB | 91 MB |
| Requires iOS | 13 | **12.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Heng Jia Liang](https://appshunter.io/developer/1532000635) | [东莞市易诚盛达信息技术有限公司](https://appshunter.io/developer/1784158131) |

## What reviewers say

### P.M.M.D Calculator

[App page](https://appshunter.io/ios/app/pmmd-calculator/id1631470538)

**Features:** macOS Compatibility

**In-app purchases:** none


### Voltix

[App page](https://appshunter.io/ios/app/voltix/id6739192867)

Connect to and control compatible vehicle equipment via Bluetooth. Monitor status, lock/unlock, adjust settings like speed gear and display units, and enable cruise control. Record riding videos and routes.

**Highlights:** Bluetooth connectivity, View equipment status, Lock/unlock equipment, Set speed gear and display units, Cruise control and zero start, Record riding videos and routes

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

**In-app purchases:** none


## Frequently asked questions

### Is P.M.M.D Calculator free?

P.M.M.D Calculator costs $3.99, with no in-app purchases.

### Is Voltix free?

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

### Do P.M.M.D Calculator or Voltix have ads?

Neither P.M.M.D Calculator nor Voltix shows ads.

### Which is updated more often, P.M.M.D Calculator or Voltix?

P.M.M.D Calculator ships an update every 22 months, and Voltix every 3 weeks. Most recently, P.M.M.D Calculator was updated on October 16, 2026 and Voltix on October 25, 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.*