# Document Sign vs Light Meter + SensorArray

The clearest difference is update cadence: Light Meter + SensorArray at every 2 weeks against Document Sign's every 2 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Document Sign sells 5 in-app purchases, starting at $4.99 per month and Light Meter + SensorArray sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Document Sign ships an update every 2 months, Light Meter + SensorArray every 2 weeks. The most recent releases landed on October 12, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | Document Sign | Light Meter + SensorArray |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.0 (3 ratings)](https://appshunter.io/ios/app/light-meter-plus-sensorarray/id6754421088/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 50.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Monetization | — | Free with in-app purchases |
| Size | 76 MB | 19 MB |
| Requires iOS | **15.6** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | +4 |
| Developer | [SWAINFO SOLUTIONS](https://appshunter.io/developer/1650786446) | [Dynamic Star Pty Ltd](https://appshunter.io/developer/1847769282) |

## What reviewers say

### Document Sign

[App page](https://appshunter.io/ios/app/document-sign/id6443938638)

**Features:** macOS Compatibility

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly subscription | $4.99 | per month |
| Weekly Premium Access | $6.99 | per 7 days |
| Monthly Premium Access | $9.99 | per month |
| Yearly Premium Access | $39.99 | per year |
| Lifetime Subscription | $9.99 | one-time |


### Light Meter + SensorArray

[App page](https://appshunter.io/ios/app/light-meter-plus-sensorarray/id6754421088)

This app provides hardware-validated light metering for analog film, digital cinema, and audio. It offers features like spot metering, reciprocity compensation for long exposures, and ambient color balance estimation. It's designed for professionals and works offline with a privacy-first approach.

**Highlights:** Hardware-linked spot metering, Reciprocity compensation for long exposures, Ambient color balance estimation, Calibrated sound pressure level monitoring, NOAA solar tracking, Digital film log, Focus stacking assistant

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Access all Pro-tools & calculators | $4.99 | one-time |


## Frequently asked questions

### Is Document Sign free?

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

### Is Light Meter + SensorArray free?

Light Meter + SensorArray is free to download, with in-app purchases available.

### Do Document Sign or Light Meter + SensorArray have ads?

Both Document Sign and Light Meter + SensorArray show ads.

### Which is updated more often, Document Sign or Light Meter + SensorArray?

Document Sign ships an update every 2 months, and Light Meter + SensorArray every 2 weeks. Most recently, Document Sign was updated on October 12, 2026 and Light Meter + SensorArray on October 3, 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.*