# PPFD METER vs GrowDiary

The clearest difference is in-app purchases: GrowDiary at none against PPFD METER's 3. GrowDiary also leads on update cadence (every 9 days vs every 3 weeks) and iOS requirement (16.4 vs 18.0). On price, ads 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. GrowDiary asks for nothing beyond the download.

PPFD METER ships an update every 3 weeks, GrowDiary every 9 days. The most recent releases landed on October 10, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | PPFD METER | GrowDiary |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (125 ratings)](https://appshunter.io/ios/app/ppfd-meter-grow-light-meter/id6479329051/reviews)** | — |
| Number of ratings | **125** | — |
| Positive reviews | 52.6% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | Every 3 weeks | **Every 9 days** |
| Monetization | Free with in-app purchases | — |
| Size | 46 MB | 46 MB |
| Requires iOS | 18.0 | **16.4** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 17+ |
| Developer | [Candas Pamukcu](https://appshunter.io/developer/1735587895) | [GrowD soft s.r.o.](https://appshunter.io/developer/1784239247) |

## What reviewers say

### 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 |


### GrowDiary

[App page](https://appshunter.io/ios/app/growdiary/id6739211123)

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

**In-app purchases:** none


## Frequently asked questions

### Is PPFD METER free?

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

### Is GrowDiary free?

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

### Do PPFD METER or GrowDiary have ads?

Both PPFD METER and GrowDiary show ads.

### Which is updated more often, PPFD METER or GrowDiary?

PPFD METER ships an update every 3 weeks, and GrowDiary every 9 days. Most recently, PPFD METER was updated on October 10, 2026 and GrowDiary on October 2, 2026.

---

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