# ZonePopper vs Light Spectrometer Wavelength

The clearest difference is review sentiment: Light Spectrometer Wavelength at 71% against ZonePopper's 0%. Light Spectrometer Wavelength also leads on price (Free vs $16.99) and update cadence (every 2 months vs every 38 months). ZonePopper's advantage is in-app purchases (none vs 7). On ads, device support and iOS requirement there is nothing between them.

Light Spectrometer Wavelength is free to download; ZonePopper costs $16.99 up front. Light Spectrometer Wavelength sells 4 in-app purchases, starting at $0.99 per month. ZonePopper asks for nothing beyond the download.

Light Spectrometer Wavelength holds the better App Store score, 4.2 against 4.0. That said, the two scores are not equally well evidenced: Light Spectrometer Wavelength has 96 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 0% of ZonePopper's written reviews are positive against 71% of Light Spectrometer Wavelength's.

ZonePopper ships an update every 38 months, Light Spectrometer Wavelength every 2 months. The most recent releases landed on October 24, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | ZonePopper | Light Spectrometer Wavelength |
| --- | --- | --- |
| Price | $16.99 | **Free** |
| Rating | [4.0 (2 ratings)](https://appshunter.io/ios/app/zonepopper/id1449897509/reviews) | **[4.2 (96 ratings)](https://appshunter.io/ios/app/light-spectrometer-wavelength/id6450930820/reviews)** |
| Number of ratings | 2 | **96** |
| Positive reviews | 0.0% of reviews | **70.6% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 38 months | **Every 2 months** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 49 MB | 43 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [James Lemezis](https://appshunter.io/developer/1449897508) | [Contechity AB](https://appshunter.io/developer/1649290454) |

## What reviewers say

### ZonePopper

[App page](https://appshunter.io/ios/app/zonepopper/id1449897509)

Control EtherRain irrigation systems directly from your iOS device. Easily initiate manual watering cycles and perform valve tests for convenient system management. Requires connection to the same WiFi network as your controllers.

**Highlights:** Immediate zone control, Manual cycle execution, Valve testing, WiFi network connection, Help guidance

**Features:** macOS Compatibility

**In-app purchases:** none


### Light Spectrometer Wavelength

[App page](https://appshunter.io/ios/app/light-spectrometer-wavelength/id6450930820)

This application analyzes light to determine its dominant wavelength in nanometers, frequency in terahertz, and period length in femtoseconds. It provides real-time measurements and allows users to save their findings with notes. The app is designed for measuring colored light sources.

**Highlights:** Measures dominant wavelength (nm), Measures frequency (THz), Measures period length (fs), Real-time measurement, Save measurements with notes, Optional calibration

**Features:** Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Access | $0.99 | per month |
| Full access | $0.99 | per month |
| Full access | $4.99 | per year |
| Full access | $6.99 | one-time |


## Frequently asked questions

### Is ZonePopper free?

ZonePopper costs $16.99, with no in-app purchases.

### Is Light Spectrometer Wavelength free?

Light Spectrometer Wavelength is free to download, with in-app purchases available.

### Which has better reviews, ZonePopper or Light Spectrometer Wavelength?

Light Spectrometer Wavelength is rated higher. ZonePopper averages 4.0 out of 5 from 2 ratings, while Light Spectrometer Wavelength averages 4.2 from 96 ratings.

### Do ZonePopper or Light Spectrometer Wavelength have ads?

Neither ZonePopper nor Light Spectrometer Wavelength shows ads.

### Which is updated more often, ZonePopper or Light Spectrometer Wavelength?

ZonePopper ships an update every 38 months, and Light Spectrometer Wavelength every 2 months. Most recently, ZonePopper was updated on October 24, 2026 and Light Spectrometer Wavelength on October 30, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*