# Stair Calculator vs Flash.It

The clearest difference is review sentiment: Flash.It at 92% against Stair Calculator's 21%. Flash.It also leads on rating (4.6 vs 4.1) and update cadence (every 3 weeks vs every 3 months). Stair Calculator's advantage is ratings volume (740 vs 8). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Stair Calculator sells 2 in-app purchases, starting at $9.99 per year and Flash.It sells 10 in-app purchases, starting at $29.00 per month. Whichever you choose, the download price is not the number that matters.

Flash.It holds the better App Store score, 4.6 against 4.1. That said, the two scores are not equally well evidenced: Stair Calculator has 740 ratings behind it against 8, 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 92% of Flash.It's.

Stair Calculator ships an update every 3 months, Flash.It every 3 weeks. The most recent releases landed on November 3, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | Stair Calculator | Flash.It |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.1 (740 ratings)](https://appshunter.io/ios/app/stair-calculator-construction/id1493037366/reviews) | **[4.6 (8 ratings)](https://appshunter.io/ios/app/flashit-metal-flashing/id1599661057/reviews)** |
| Number of ratings | **740** | 8 |
| Positive reviews | 21.4% of reviews | **92.3% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 3 weeks** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 1 MB | 120 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Phan Nhat Đang](https://appshunter.io/developer/1437390098) | [Structured Steel](https://appshunter.io/developer/1599661059) |

## 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


### Flash.It

[App page](https://appshunter.io/ios/app/flashit-metal-flashing/id1599661057)

Streamline your flashing orders with this mobile tool designed for roofers. Quickly draw, organize, and order your flashings efficiently to save time and reduce errors.

**Highlights:** Draw flashings quickly, Organize flashing orders, Order flashings easily, Manage all flashing orders, Improve order efficiency

**Features:** Vision Pro support

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $29.00 | per month |
| Individual Affiliate Monthly | $29.00 | per month |
| Crew of 3 | $79.00 | per month |
| Company 3 Member Affiliate | $79.00 | per month |
| Crew of 5 | $129.00 | per month |
| 5 Member Affiliate Monthly | $129.00 | per month |
| Individual Plan | $249.00 | per year |
| 10 Member Affiliate | $249.00 | per month |
| Crew of 3 | $690.00 | per year |
| 3 Member Affiliate Plan | $690.00 | per year |


## Frequently asked questions

### Is Stair Calculator free?

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

### Is Flash.It free?

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

### Which has better reviews, Stair Calculator or Flash.It?

Flash.It is rated higher. Stair Calculator averages 4.1 out of 5 from 740 ratings, while Flash.It averages 4.6 from 8 ratings.

### Do Stair Calculator or Flash.It have ads?

Neither Stair Calculator nor Flash.It shows ads.

### Which is updated more often, Stair Calculator or Flash.It?

Stair Calculator ships an update every 3 months, and Flash.It every 3 weeks. Most recently, Stair Calculator was updated on November 3, 2026 and Flash.It on November 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.*