# Illuminance Meter vs PDFlow

The clearest difference is review sentiment: PDFlow at 100% against Illuminance Meter's 0%. PDFlow also leads on update cadence (weekly vs every 3 months). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Illuminance Meter sells 3 in-app purchases, starting at $3.99 per 7 days and PDFlow sells 2 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Illuminance Meter ships an update every 3 months, PDFlow weekly. Both last shipped on October 31, 2026.

## The numbers

| Metric | Illuminance Meter | PDFlow |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.5 (2 ratings)](https://appshunter.io/ios/app/pdflow-split-and-delete-pages/id6779042750/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | 0.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Weekly** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 13 MB | 10 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [LEAN ASIA CO., LTD](https://appshunter.io/developer/1815050814) | [Trivialware](https://appshunter.io/developer/287295857) |

## What reviewers say

### Illuminance Meter

[App page](https://appshunter.io/ios/app/illuminance-meter-lux-ppfd/id6759972986)

Transform your iPhone into a professional light meter to measure illuminance in lux or foot-candles. Ideal for photographers, plant enthusiasts, and workplace safety, it provides instant, accurate light readings with various specialized modes and data export options.

**Highlights:** Real-time lux measurement with live gauge, Photography mode for exposure value (EV) calculation, Plant light mode with recommendations, Workplace standards verification, Measurement history with export options, Spectrum analysis for color temperature and CRI, Multiple illuminance unit switching

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Weekly Plan | $3.99 | per 7 days |
| Premium Yearly | $19.99 | per year |
| Lifetime | $39.99 | one-time |


### PDFlow

[App page](https://appshunter.io/ios/app/pdflow-split-and-delete-pages/id6779042750)

This app offers a suite of 9 tools to manage PDF files directly on your device. It allows you to merge, split, compress, reorder, remove, rotate, unlock, protect, and convert PDFs to images without needing an account or internet connection.

**Highlights:** Merge multiple PDFs, Split PDFs into ranges or specific pages, Compress PDF file size, Reorder and remove pages, Rotate pages within the file, Unlock password-protected PDFs, Protect PDFs with encryption, Convert PDFs to JPG/PNG images

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PDFlow One Month | $2.99 | one-time |
| PDFlow Lifetime | $19.99 | one-time |


## Frequently asked questions

### Is Illuminance Meter free?

Illuminance Meter is free to download, with in-app purchases available.

### Is PDFlow free?

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

### Do Illuminance Meter or PDFlow have ads?

Neither Illuminance Meter nor PDFlow shows ads.

### Which is updated more often, Illuminance Meter or PDFlow?

Illuminance Meter ships an update every 3 months, and PDFlow weekly. Most recently, Illuminance Meter was updated on October 31, 2026 and PDFlow on October 31, 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.*