# DragCalc vs RigMaster

The clearest difference is in-app purchases: DragCalc at none against RigMaster's 4. RigMaster's advantage is update cadence (every 11 days vs every 5 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. RigMaster sells 4 in-app purchases, starting at $0.99 per 7 days. DragCalc asks for nothing beyond the download.

DragCalc ships an update every 5 months, RigMaster every 11 days. The most recent releases landed on October 31, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | DragCalc | RigMaster |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (1 ratings)](https://appshunter.io/ios/app/dragcalc/id6758584657/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 5 months | **Every 11 days** |
| Monetization | Ad-supported | — |
| Size | 17 MB | 5 MB |
| Requires iOS | 18.1 | **17.0** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Sheharyar Irfan](https://appshunter.io/developer/974971911) | [Grima Hdez](https://appshunter.io/developer/1741481582) |

## What reviewers say

### DragCalc

[App page](https://appshunter.io/ios/app/dragcalc/id6758584657)

This app predicts drag racing performance metrics like quarter-mile times and trap speeds using a physics-based simulation. It allows users to input car specifications, compare different builds, and analyze real-world runs.

**Highlights:** AI-powered car input, Quarter & Eighth Mile ET/trap speed predictions, Side-by-side car build comparison, Slope correction for track grade, Analysis of imported run data, Cloud sync for presets

**Features:** macOS Compatibility

**In-app purchases:** none


### RigMaster

[App page](https://appshunter.io/ios/app/rigmaster-rigging-calculator/id6789944360)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Weekly | $0.99 | per 7 days |
| RigMaster Pro Monthly | $2.99 | per month |
| Pro Yearly | $19.99 | per year |
| RigMaster Pro | $39.99 | one-time |


## Frequently asked questions

### Is DragCalc free?

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

### Is RigMaster free?

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

### Do DragCalc or RigMaster have ads?

Both DragCalc and RigMaster show ads.

### Which is updated more often, DragCalc or RigMaster?

DragCalc ships an update every 5 months, and RigMaster every 11 days. Most recently, DragCalc was updated on October 31, 2026 and RigMaster on November 6, 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.*