# Sheet Metal Calculator vs InboxGuard

The clearest difference is in-app purchases: InboxGuard at none against Sheet Metal Calculator's 3. InboxGuard also leads on update cadence (monthly vs every 4 months). Sheet Metal Calculator's advantage is iOS requirement (13.0 vs 17.6). On price, ads and device support there is nothing between them.

Both are free to download. Sheet Metal Calculator sells 3 in-app purchases, starting at $3.99 per 7 days. InboxGuard asks for nothing beyond the download.

Sheet Metal Calculator ships an update every 4 months, InboxGuard monthly. Both last shipped on October 24, 2026.

## The numbers

| Metric | Sheet Metal Calculator | InboxGuard |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.4 (9 ratings)](https://appshunter.io/ios/app/sheet-metal-calculator/id6469767934/reviews)** | — |
| Number of ratings | **9** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 months | **Monthly** |
| Monetization | Paid | — |
| Size | 39 MB | 4 MB |
| Requires iOS | **13.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 17+ |
| Developer | [Kantaben Gorasiya](https://appshunter.io/developer/1640260396) | [Shashwat Patel](https://appshunter.io/developer/1873309489) |

## What reviewers say

### Sheet Metal Calculator

[App page](https://appshunter.io/ios/app/sheet-metal-calculator/id6469767934)

This app simplifies sheet metal calculations for professionals and DIYers. It helps determine material thickness, size, weight, bend allowances, and cut lengths. Features include material selection, unit conversions, and geometric shape calculations.

**Highlights:** Material selection database, Thickness and size calculations, Accurate weight estimations, Bend allowance and K-factor calculation, Cut length and offcut optimization, Unit conversion tools, Geometric shape calculations

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $3.99 | per 7 days |
| Monthly | $8.99 | per month |
| Yearly | $17.99 | per year |


### InboxGuard

[App page](https://appshunter.io/ios/app/inboxguard/id6762069042)

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

**In-app purchases:** none


## Frequently asked questions

### Is Sheet Metal Calculator free?

Sheet Metal Calculator is free to download, with in-app purchases available.

### Is InboxGuard free?

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

### Do Sheet Metal Calculator or InboxGuard have ads?

Neither Sheet Metal Calculator nor InboxGuard shows ads.

### Which is updated more often, Sheet Metal Calculator or InboxGuard?

Sheet Metal Calculator ships an update every 4 months, and InboxGuard monthly. Most recently, Sheet Metal Calculator was updated on October 24, 2026 and InboxGuard on October 24, 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.*