# ShiftPower vs Starrettcalc

The clearest difference is ads: Starrettcalc at none against ShiftPower's shown. ShiftPower's advantage is device support (4 vs 2) and iOS requirement (15.1 vs 17.5). On price, update cadence and in-app purchases there is nothing between them.

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

ShiftPower ships an update every 2 weeks, Starrettcalc fortnightly. The most recent releases landed on September 29, 2026 and June 5, 2026 respectively.

## The numbers

| Metric | ShiftPower | Starrettcalc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (316 ratings)](https://appshunter.io/ios/app/shiftpower/id1473662284/reviews)** | — |
| Number of ratings | **316** | — |
| Positive reviews | 71.4% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Every 2 weeks** | Fortnightly |
| Monetization | Ad-supported | — |
| Size | 109 MB | 50 MB |
| Requires iOS | **15.1** | 17.5 |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPad |
| Age rating | +4 | 4+ |
| Developer | [Faaftech Tecnologia Ltda](https://appshunter.io/developer/1473662283) | [Starrett](https://appshunter.io/developer/1770773250) |

## What reviewers say

### ShiftPower

[App page](https://appshunter.io/ios/app/shiftpower/id1473662284)

Enhance your driving experience with customizable acceleration modes for sportier and safer performance. Control your vehicle's safety with dedicated Lock and Valet modes, offering over 300 acceleration response maps for a personalized feel.

**Highlights:** Four customizable driving modes, Lock and Valet safety modes, Over 300 acceleration response maps, Sportier and safer overtaking, Plug-and-Play installation

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


### Starrettcalc

[App page](https://appshunter.io/ios/app/starrettcalc/id6720754373)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is ShiftPower free?

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

### Is Starrettcalc free?

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

### Do ShiftPower or Starrettcalc have ads?

ShiftPower shows ads; Starrettcalc does not.

### Which is updated more often, ShiftPower or Starrettcalc?

ShiftPower ships an update every 2 weeks, and Starrettcalc fortnightly. Most recently, ShiftPower was updated on September 29, 2026 and Starrettcalc on June 5, 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.*