# HATO ONE vs Light Spectrometer Wavelength

The clearest difference is review sentiment: Light Spectrometer Wavelength at 71% against HATO ONE's 0%. Light Spectrometer Wavelength also leads on rating (4.2 vs 2.0) and update cadence (every 2 months vs every 8 months). HATO ONE's advantage is in-app purchases (none vs 7) and iOS requirement (11.0 vs 15.0). On price, ads and device support there is nothing between them.

Both are free to download. Light Spectrometer Wavelength sells 4 in-app purchases, starting at $0.99 per month. HATO ONE asks for nothing beyond the download.

Light Spectrometer Wavelength holds the better App Store score, 4.2 against 2.0. That said, the two scores are not equally well evidenced: Light Spectrometer Wavelength has 96 ratings behind it against 5, so its average is the more settled of the two. Written reviews point the same way: 0% of HATO ONE's written reviews are positive against 71% of Light Spectrometer Wavelength's.

HATO ONE ships an update every 8 months, Light Spectrometer Wavelength every 2 months. The most recent releases landed on October 21, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | HATO ONE | Light Spectrometer Wavelength |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.0 (5 ratings)](https://appshunter.io/ios/app/hato-one/id1392122761/reviews) | **[4.2 (96 ratings)](https://appshunter.io/ios/app/light-spectrometer-wavelength/id6450930820/reviews)** |
| Number of ratings | 5 | **96** |
| Positive reviews | 0.0% of reviews | **70.6% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 2 months** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 31 MB | 43 MB |
| Requires iOS | **11.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [United Power Research Technology Corporation](https://appshunter.io/developer/1501316337) | [Contechity AB](https://appshunter.io/developer/1649290454) |

## What reviewers say

### HATO ONE

[App page](https://appshunter.io/ios/app/hato-one/id1392122761)

This utility app measures key light aspects crucial for poultry welfare and performance. It allows comparison with industry standards and export of data for analysis. Remote measurement capabilities enhance user convenience.

**Highlights:** Measures light intensity, Measures critical color temperature, Measures light spectrum, Measures color rendering index, Measures light flicker, Compares measurements to standards, Exports data to PC, Remote measurement

**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 HATO ONE free?

HATO ONE is free to download, 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, HATO ONE or Light Spectrometer Wavelength?

Light Spectrometer Wavelength is rated higher. HATO ONE averages 2.0 out of 5 from 5 ratings, while Light Spectrometer Wavelength averages 4.2 from 96 ratings.

### Do HATO ONE or Light Spectrometer Wavelength have ads?

Neither HATO ONE nor Light Spectrometer Wavelength shows ads.

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

HATO ONE ships an update every 8 months, and Light Spectrometer Wavelength every 2 months. Most recently, HATO ONE was updated on October 21, 2026 and Light Spectrometer Wavelength on October 30, 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.*