# Deflection Calculator vs SnoTel Mapper

The clearest difference is price: Deflection Calculator at Free against SnoTel Mapper's $2.49. Deflection Calculator also leads on in-app purchases (none vs 2) and iOS requirement (14.0 vs 17.6). On update cadence, ads and device support there is nothing between them.

Deflection Calculator is free to download; SnoTel Mapper costs $2.49 up front. SnoTel Mapper sells 2 in-app purchases, starting at $2.99 per month. Deflection Calculator asks for nothing beyond the download.

Deflection Calculator ships an update every 3 months, SnoTel Mapper every 6 weeks. The most recent releases landed on September 19, 2026 and September 11, 2026 respectively.

## The numbers

| Metric | Deflection Calculator | SnoTel Mapper |
| --- | --- | --- |
| Price | **Free** | $2.49 |
| Rating | **[5.0 (4 ratings)](https://appshunter.io/ios/app/deflection-calculator/id1528914419/reviews)** | — |
| Number of ratings | **4** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 6 weeks** |
| Monetization | Free | — |
| Size | 2 MB | 82 MB |
| Requires iOS | **14.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Neill Mclachlan](https://appshunter.io/developer/1527884833) | [Jason Flaherty](https://appshunter.io/developer/1714314673) |

## What reviewers say

### Deflection Calculator

[App page](https://appshunter.io/ios/app/deflection-calculator/id1528914419)

Calculate tube and roll straightener deflection with this app. Input key parameters like diameter and material properties to get accurate results in inches or millimeters. Access past calculations and machine-specific data.

**Highlights:** Deflection calculation, Input outside diameter, roll center, yield, and Young's modulus, Output in inches or millimeters, Unit selector (imperial/metric), History of past calculations, Pre-set roll center values for over 50 machines, Pre-set Young's modulus for 6 metals

**Features:** macOS Compatibility

**In-app purchases:** none


### SnoTel Mapper

[App page](https://appshunter.io/ios/app/snotel-mapper-snow-data/id6470841771)

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly Subscription | $2.99 | per month |
| Premium Yearly Subscription | $24.99 | per year |


## Frequently asked questions

### Is Deflection Calculator free?

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

### Is SnoTel Mapper free?

SnoTel Mapper costs $2.49, and also offers in-app purchases.

### Do Deflection Calculator or SnoTel Mapper have ads?

Neither Deflection Calculator nor SnoTel Mapper shows ads.

### Which is updated more often, Deflection Calculator or SnoTel Mapper?

Deflection Calculator ships an update every 3 months, and SnoTel Mapper every 6 weeks. Most recently, Deflection Calculator was updated on September 19, 2026 and SnoTel Mapper on September 11, 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.*