# DynoScan vs TallyRig

The clearest difference is in-app purchases: DynoScan at none against TallyRig's 1. On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. TallyRig sells 1 one-off in-app purchase. DynoScan asks for nothing beyond the download.

## The numbers

| Metric | DynoScan | TallyRig |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.0 (1 ratings)](https://appshunter.io/ios/app/tallyrig-well-control-calc/id6758645641/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Every 3 months |
| Monetization | — | Free |
| Size | 6 MB | 33 MB |
| Requires iOS | 16.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [WANSCO, LLC](https://appshunter.io/developer/1438691970) | [嘉炜 丰](https://appshunter.io/developer/1759511819) |

## What reviewers say

### DynoScan

[App page](https://appshunter.io/ios/app/dynoscan/id6584512331)

**Features:** macOS Compatibility

**In-app purchases:** none


### TallyRig

[App page](https://appshunter.io/ios/app/tallyrig-well-control-calc/id6758645641)

This app provides a suite of 17 oilfield and drilling calculators designed for field use. It features a digital tally-book history to save and share results, with offline functionality and a user-friendly interface for rig environments. Supports multiple languages and unit systems.

**Highlights:** 17 oilfield & drilling calculators, Digital tally-book history, Offline-first functionality, Sunlight Mode for outdoor readability, Glove-friendly interface, Formula review and show-work, Imperial and Metric unit support

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| TallyRig Pro | $14.99 | one-time |


## Frequently asked questions

### Is DynoScan free?

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

### Is TallyRig free?

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

### Do DynoScan or TallyRig have ads?

Neither DynoScan nor TallyRig shows ads.

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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.*