# Light Detective vs Pulse Periods Tracker

The clearest difference is ads: Light Detective at none against Pulse Periods Tracker's shown. Pulse Periods Tracker's advantage is update cadence (every 4 weeks vs every 8 months). On price, in-app purchases, device support and iOS requirement there is nothing between them.

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

Light Detective ships an update every 8 months, Pulse Periods Tracker every 4 weeks. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Light Detective | Pulse Periods Tracker |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/light-detective/id1260936039/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 8 months | **Every 4 weeks** |
| Monetization | Free | — |
| Size | 120 MB | 71 MB |
| Requires iOS | **13.0** | 14.0.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Signet Armorlite, Inc.](https://appshunter.io/developer/584848264) | [DIGITALHELP UK](https://appshunter.io/developer/1717391864) |

## What reviewers say

### Light Detective

[App page](https://appshunter.io/ios/app/light-detective/id1260936039)

This app educates patients about blue light and UV radiation, demonstrating the benefits of blue-coated lenses with simulations and images. It also measures blue light and UV radiation from various sources to enhance patient understanding.

**Highlights:** Patient education on blue light and UV, Simulations and images of lens benefits, Blue light measurement from light sources, UV radiation measurement, Information for eye care professionals

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

**In-app purchases:** none


### Pulse Periods Tracker

[App page](https://appshunter.io/ios/app/pulse-periods-tracker/id6738274657)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Light Detective free?

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

### Is Pulse Periods Tracker free?

Pulse Periods Tracker is free to download, with no in-app purchases.

### Do Light Detective or Pulse Periods Tracker have ads?

Pulse Periods Tracker shows ads; Light Detective does not.

### Which is updated more often, Light Detective or Pulse Periods Tracker?

Light Detective ships an update every 8 months, and Pulse Periods Tracker every 4 weeks. Most recently, Light Detective was updated on October 24, 2026 and Pulse Periods Tracker on October 25, 2026.

---

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