# DoubleGlazingApp vs Zap Panels

The clearest difference is in-app purchases: DoubleGlazingApp at none against Zap Panels's 1. DoubleGlazingApp also leads on iOS requirement (13.0 vs 17.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Zap Panels sells 1 one-off in-app purchase. DoubleGlazingApp asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on November 2, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | DoubleGlazingApp | Zap Panels |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 33.3% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Monetization | Free | — |
| Size | 9 MB | 15 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Infonote](https://appshunter.io/developer/381507445) | [William Lee](https://appshunter.io/developer/1893165176) |

## What reviewers say

### DoubleGlazingApp

[App page](https://appshunter.io/ios/app/doubleglazingapp/id1455462117)

Easily measure and price new double glazing units at your own pace. Features an assistive measuring tool and allows direct submission of measurements to installers for the next stage of your inquiry.

**Highlights:** Measure double glazing units, Price double glazing units, Assistive measuring device, Submit measurements to installers, Professional assistance button

**Features:** macOS Compatibility

**In-app purchases:** none


### Zap Panels

[App page](https://appshunter.io/ios/app/zap-panels/id6762159840)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Zap Panels Premium | $4.99 | one-time |


## Frequently asked questions

### Is DoubleGlazingApp free?

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

### Is Zap Panels free?

Zap Panels is free to download, with in-app purchases available.

### Do DoubleGlazingApp or Zap Panels have ads?

Neither DoubleGlazingApp nor Zap Panels shows ads.

### Which is updated more often, DoubleGlazingApp or Zap Panels?

DoubleGlazingApp ships an update every 3 weeks, and Zap Panels every 3 weeks. Most recently, DoubleGlazingApp was updated on November 2, 2026 and Zap Panels 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.*