# Light Meter LM vs Random Alarms

The clearest difference is review sentiment: Random Alarms at 100% against Light Meter LM's 40%. Random Alarms also leads on rating (5.0 vs 4.5). Light Meter LM's advantage is ratings volume (2.6K vs 1) and update cadence (monthly vs every 2 months). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Light Meter LM sells 3 in-app purchases, starting at $3.49 per month and Random Alarms sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Random Alarms holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: Light Meter LM has 2.6K ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 40% of Light Meter LM's written reviews are positive against 100% of Random Alarms's.

Light Meter LM ships an update monthly, Random Alarms every 2 months. The most recent releases landed on November 3, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | Light Meter LM | Random Alarms |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (2.6K ratings)](https://appshunter.io/ios/app/light-meter-lm-3000/id1554264761/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/random-alarms/id6743171365/reviews)** |
| Number of ratings | **2.6K** | 1 |
| Positive reviews | 40.4% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Monthly** | Every 2 months |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 22 MB | 225 MB |
| Requires iOS | **15.0** | 17.2 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 12+ |
| Developer | [Lightray Innovation GmbH](https://appshunter.io/developer/1031383431) | [Wuhan Jingyao Technology Co., Ltd.](https://appshunter.io/developer/1704107947) |

## What reviewers say

### Light Meter LM

[App page](https://appshunter.io/ios/app/light-meter-lm-3000/id1554264761)

Transform your smartphone into a professional light meter. Measure illuminance and color temperature with scientifically validated accuracy, trusted by professionals. Requires a simple diffuser for precise readings.

**Highlights:** Measure illuminance (lux/foot-candle), Measure color temperature (Kelvin), Industry-leading accuracy, Pre-calibrated for your device, Low light sensitivity, Save peak reading, Custom calibration option

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Continuous Charging | $3.49 | per month |
| Single Charge | $0.99 | one-time |
| Unlimited Battery | $19.99 | one-time |

**What reviewers like**

- 👍 Great app
- 👍 Accurate measurements
- 👍 Easy to use
- 👍 Helpful customer service
- 👍 Useful for science/research

**What reviewers complain about**

- 🐛 Requires diffuser for accurate readings
- 💰 Expensive for a light meter app
- 🔋 Battery/trial period issues
- 🔍 Inconsistent/inaccurate readings
- 🙄 Misleading/deceptive marketing

**Reported bugs**

- Diffuser not recognized even when used
- App locks up/crashes
- Constant diffuser pop-up interruptions

**Requested features**

- Ability to use rear camera
- More flexible diffuser options
- Improved accuracy without diffuser


### Random Alarms

[App page](https://appshunter.io/ios/app/random-alarms/id6743171365)

Receive occasional reminders without being tied to a specific time. This utility app provides flexible notifications for when you need them, offering a less rigid approach to staying on track.

**Highlights:** Time-independent reminders, Occasional notification prompts, Flexible scheduling, User-controlled notifications

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Custom Audio Upload | $0.99 | one-time |


## Frequently asked questions

### Is Light Meter LM free?

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

### Is Random Alarms free?

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

### Which has better reviews, Light Meter LM or Random Alarms?

Random Alarms is rated higher. Light Meter LM averages 4.5 out of 5 from 2.6K ratings, while Random Alarms averages 5.0 from 1 ratings.

### Do Light Meter LM or Random Alarms have ads?

Neither Light Meter LM nor Random Alarms shows ads.

### Which is updated more often, Light Meter LM or Random Alarms?

Light Meter LM ships an update monthly, and Random Alarms every 2 months. Most recently, Light Meter LM was updated on November 3, 2026 and Random Alarms on November 4, 2026.

---

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