# uSpectrum PAR vs Seymour Ag

The clearest difference is update cadence: Seymour Ag at weekly against uSpectrum PAR's every 8 months. uSpectrum PAR's advantage is iOS requirement (9.0 vs 13.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

uSpectrum PAR ships an update every 8 months, Seymour Ag weekly. The most recent releases landed on October 21, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | uSpectrum PAR | Seymour Ag |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.0 (3 ratings)](https://appshunter.io/ios/app/uspectrum-par/id1466017397/reviews)** | — |
| Number of ratings | **3** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 8 months | **Weekly** |
| Monetization | Free | — |
| Size | 25 MB | 26 MB |
| Requires iOS | **9.0** | 13.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [United Power Research Technology Corporation](https://appshunter.io/developer/1501316337) | [Seymour Ag Instruments Ltd](https://appshunter.io/developer/1675755141) |

## What reviewers say

### uSpectrum PAR

[App page](https://appshunter.io/ios/app/uspectrum-par/id1466017397)

This application connects wirelessly to a handheld spectral PAR meter, allowing remote analysis and configuration of light sources. It displays detailed spectral data, light source information, and absorption metrics, with options to save and share measurements.

**Highlights:** Wireless Bluetooth connection, Remote light source analysis, Save captured data, Display spectrum and CIE diagrams, View light source metrics (LUX, CCT, CRI), Share measured data via email

**Features:** macOS Compatibility

**In-app purchases:** none


### Seymour Ag

[App page](https://appshunter.io/ios/app/seymour-ag/id6446065019)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is uSpectrum PAR free?

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

### Is Seymour Ag free?

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

### Do uSpectrum PAR or Seymour Ag have ads?

Neither uSpectrum PAR nor Seymour Ag shows ads.

### Which is updated more often, uSpectrum PAR or Seymour Ag?

uSpectrum PAR ships an update every 8 months, and Seymour Ag weekly. Most recently, uSpectrum PAR was updated on October 21, 2026 and Seymour Ag on October 27, 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.*