# Stair Calculator vs MillerTech

The clearest difference is review sentiment: MillerTech at 100% against Stair Calculator's 21%. MillerTech also leads on in-app purchases (none vs 2) and rating (4.3 vs 4.1). Stair Calculator's advantage is ratings volume (740 vs 6). 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. MillerTech asks for nothing beyond the download.

MillerTech holds the better App Store score, 4.3 against 4.1. That said, the two scores are not equally well evidenced: Stair Calculator has 740 ratings behind it against 6, so its average is the more settled of the two. Written reviews point the same way: 21% of Stair Calculator's written reviews are positive against 100% of MillerTech's.

Stair Calculator ships an update every 3 months, MillerTech every 2 months. The most recent releases landed on October 24, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Stair Calculator | MillerTech |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.1 (740 ratings)](https://appshunter.io/ios/app/stair-calculator-construction/id1493037366/reviews) | **[4.3 (6 ratings)](https://appshunter.io/ios/app/millertech/id1628834753/reviews)** |
| Number of ratings | **740** | 6 |
| Positive reviews | 21.4% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 months** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 1 MB | 42 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Phan Nhat Đang](https://appshunter.io/developer/1437390098) | [Lester Miller](https://appshunter.io/developer/1646174937) |

## 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


### MillerTech

[App page](https://appshunter.io/ios/app/millertech/id1628834753)

Monitor your lithium batteries with Bluetooth technology. Get instant access to key battery stats like voltage, state-of-charge, and real-time power usage. Enhance your experience and gain peace of mind with at-a-glance data.

**Highlights:** Bluetooth battery monitoring, Real-time power usage, Battery voltage display, State-of-Charge tracking, Design and remaining capacity

**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 MillerTech free?

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

### Which has better reviews, Stair Calculator or MillerTech?

MillerTech is rated higher. Stair Calculator averages 4.1 out of 5 from 740 ratings, while MillerTech averages 4.3 from 6 ratings.

### Do Stair Calculator or MillerTech have ads?

Neither Stair Calculator nor MillerTech shows ads.

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

Stair Calculator ships an update every 3 months, and MillerTech every 2 months. Most recently, Stair Calculator was updated on October 24, 2026 and MillerTech on October 7, 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.*