# Stair Calculator vs BattGuard

The clearest difference is in-app purchases: BattGuard at none against Stair Calculator's 2. BattGuard also leads on iOS requirement (12.0 vs 15.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Stair Calculator sells 2 in-app purchases, starting at $9.99 per year. BattGuard asks for nothing beyond the download.

Stair Calculator ships an update every 3 months, BattGuard every 5 months. The most recent releases landed on November 3, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Stair Calculator | BattGuard |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.1 (740 ratings)](https://appshunter.io/ios/app/stair-calculator-construction/id1493037366/reviews)** | — |
| Number of ratings | **740** | — |
| Positive reviews | 21.4% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 5 months |
| Monetization | Free with in-app purchases | — |
| Size | 1 MB | 41 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Phan Nhat Đang](https://appshunter.io/developer/1437390098) | [VIC OFFROAD PTY. LTD.](https://appshunter.io/developer/1757593190) |

## What reviewers say

### Stair Calculator

[App page](https://appshunter.io/ios/app/stair-calculator-construction/id1493037366)

This app calculates essential parameters for stair construction, offering flexibility in input and providing multiple step set options. It supports various units and allows results to be easily copied.

**Highlights:** Calculate stair construction parameters, Flexible input for Run or Total Run, Determine largest and smallest step sets, Support for various units, Copy results to clipboard

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Annual Premium Package | $9.99 | per year |
| Unlock all features | $5.99 | one-time |

**What reviewers like**

- 👍 Easy to use
- 🚀 Helpful information
- 🚀 Provides useful calculations

**What reviewers complain about**

- 🐛 Doesn't work as expected
- 🔒 No way to cancel subscription
- 🔒 Difficult to cancel trial
- 🤬 Obnoxious ads
- 🤬 Misleading as a learning tool

**Reported bugs**

- Subscription numbers don't add up
- Doesn't provide promised features after purchase

**Requested features**

- Option to uninstall app
- Ability to calculate run based on rise and landing space
- Provide more detailed diagrams and visuals


### BattGuard

[App page](https://appshunter.io/ios/app/battguard/id6744353179)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Stair Calculator free?

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

### Is BattGuard free?

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

### Do Stair Calculator or BattGuard have ads?

Neither Stair Calculator nor BattGuard shows ads.

### Which is updated more often, Stair Calculator or BattGuard?

Stair Calculator ships an update every 3 months, and BattGuard every 5 months. Most recently, Stair Calculator was updated on November 3, 2026 and BattGuard on October 30, 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.*