# Stair Calculator vs dooplicator

The clearest difference is review sentiment: dooplicator at 96% against Stair Calculator's 21%. dooplicator also leads on rating (4.8 vs 4.1) and in-app purchases (none vs 2). Stair Calculator's advantage is ratings volume (740 vs 69). 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. dooplicator asks for nothing beyond the download.

dooplicator holds the better App Store score, 4.8 against 4.1. That said, the two scores are not equally well evidenced: Stair Calculator has 740 ratings behind it against 69, 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 96% of dooplicator's.

Both ship on a similar rhythm, roughly every 3 months. Both last shipped on October 24, 2026.

## The numbers

| Metric | Stair Calculator | dooplicator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.1 (740 ratings)](https://appshunter.io/ios/app/stair-calculator-construction/id1493037366/reviews) | **[4.8 (69 ratings)](https://appshunter.io/ios/app/dooplicator/id1585564247/reviews)** |
| Number of ratings | **740** | 69 |
| Positive reviews | 21.4% of reviews | **95.7% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 months | Every 3 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 1 MB | 13 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Phan Nhat Đang](https://appshunter.io/developer/1437390098) | [Dooplicator Special Technologies Inc.](https://appshunter.io/developer/1585564249) |

## 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


### dooplicator

[App page](https://appshunter.io/ios/app/dooplicator/id1585564247)

Create a digital backup of your physical key to avoid the stress of losing it. This utility eliminates the need for costly dealer programming, offering a convenient solution for emergencies or as a spare.

**Highlights:** Digital key backup, No dealer programming, Emergency key solution, Spare key creation

**In-app purchases:** none

**What reviewers like**

- 🚀 Fast shipping and delivery
- 👍 Easy to use app and process
- 💰 Cost-effective compared to dealers
- 💡 Innovative key duplication service
- 🛠️ Great customer support

**What reviewers complain about**

- ⏳ Shipping can take a while (customs)
- 🇨🇳 Some items ship from China
- 🐛 Key not working initially (resolved)
- ❓ Compatibility with older models unclear

**Reported bugs**

- First key lost in mail (resolved by reshipment)
- One instance of a broken key received
- One instance of a wrong key received (resolved)

**Requested features**

- App for older Skidoo models (pre-2015)
- Include a split ring with the key


## Frequently asked questions

### Is Stair Calculator free?

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

### Is dooplicator free?

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

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

dooplicator is rated higher. Stair Calculator averages 4.1 out of 5 from 740 ratings, while dooplicator averages 4.8 from 69 ratings.

### Do Stair Calculator or dooplicator have ads?

Neither Stair Calculator nor dooplicator shows ads.

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

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