# uSpectrum PAR vs PPFD METER

The clearest difference is rating: PPFD METER at 4.6 against uSpectrum PAR's 1.0. PPFD METER also leads on update cadence (every 3 weeks vs every 8 months) and ratings volume (118 vs 2). uSpectrum PAR's advantage is in-app purchases (none vs 3) and ads (none vs shown). On price and device support there is nothing between them.

Both are free to download. PPFD METER sells 3 in-app purchases, starting at $1.99 per month. uSpectrum PAR asks for nothing beyond the download.

PPFD METER holds the better App Store score, 4.6 against 1.0. That said, the two scores are not equally well evidenced: PPFD METER has 118 ratings behind it against 2, so its average is the more settled of the two.

uSpectrum PAR ships an update every 8 months, PPFD METER every 3 weeks. The most recent releases landed on September 16, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | uSpectrum PAR | PPFD METER |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.0 (2 ratings)](https://appshunter.io/ios/app/uspectrum-par/id1466017397/reviews) | **[4.6 (118 ratings)](https://appshunter.io/ios/app/ppfd-meter-grow-light-meter/id6479329051/reviews)** |
| Number of ratings | 2 | **118** |
| Positive reviews | — | 52.6% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 8 months | **Every 3 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 25 MB | 43 MB |
| Requires iOS | **9.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [United Power Research Technology Corporation](https://appshunter.io/developer/1501316337) | [Candas Pamukcu](https://appshunter.io/developer/1735587895) |

## 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


### PPFD METER

[App page](https://appshunter.io/ios/app/ppfd-meter-grow-light-meter/id6479329051)

This app measures light intensity for plants, converting LUX to PPFD and DLI. It offers advanced light mapping, uniformity analysis, and efficiency insights to optimize plant growth. Customize profiles for different environments and growth stages.

**Highlights:** LUX, PPFD, DLI, and PAR measurements, Light mapping and distribution analysis, Uniformity and PPF evaluation, Energy efficiency and consumption tracking, Customizable setting profiles, Bluetooth sensor integration

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $1.99 | per month |
| Premium Plus | $2.99 | per month |
| Remove Ads | $29.99 | one-time |


## Frequently asked questions

### Is uSpectrum PAR free?

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

### Is PPFD METER free?

PPFD METER is free to download, with in-app purchases available.

### Which has better reviews, uSpectrum PAR or PPFD METER?

PPFD METER is rated higher. uSpectrum PAR averages 1.0 out of 5 from 2 ratings, while PPFD METER averages 4.6 from 118 ratings.

### Do uSpectrum PAR or PPFD METER have ads?

PPFD METER shows ads; uSpectrum PAR does not.

### Which is updated more often, uSpectrum PAR or PPFD METER?

uSpectrum PAR ships an update every 8 months, and PPFD METER every 3 weeks. Most recently, uSpectrum PAR was updated on September 16, 2026 and PPFD METER on September 22, 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.*