Comparison

Light Meter LM vs MadgeTech

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Light Meter LM

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
Read full description

Turn your smartphone into a professional-grade light meter. Measure illuminance (lux/foot-candle) and color temperature (CCT in Kelvin) with unmatched accuracy — trusted by photographers, engineers, and lighting professionals worldwide. Why waste money on a hardware meter when you’re already carrying one in your pocket? The LM-3000 offers the same quality and usability as a traditional hardware light meter. Developed by optics scientists at the Zurich University of Applied Sciences, LM-3000 is the only light meter app scientifically validated for accuracy. It achieves professional-grade precision by leveraging your iPhone's front-facing camera sensor with advanced RAW image processing. Unlike relying on estimates like other apps, it adheres to the ISO/CIE 19476 standard, ensuring measurements you can trust for critical applications. MEASUREMENTS ⎷ Illuminance in lux or foot-candles ⎷ Correlated color temperature in kelvin FEATURES ⎷ Industry-leading accuracy, matching professional high-end lux meters ⎷ Pre-calibrated for your specific device ⎷ Excellent low light sensitivity to detect light pollution ⎷ No ads ⎷ No Bluetooth and location permission required ⎷ In-app manual ⎷ Save peak reading ⎷ HOLD function with acoustic signal ⎷ Custom calibration option to align readings to another meter DIFFUSER REQUIRED Like every real light meter, the LM-3000 requires a diffuser to measure accurately. A diffuser scatters incoming light evenly on the sensor and prevents hotspots. While it may sound complex, the solution is surprisingly easy. You have two options: 1) Easily build a diffuser yourself in less than a minute using standard printer paper. This is accurate enough for most use cases. 2) Get the dedicated Diffuser Accessory (free worldwide shipping) for best accuracy and convenience. More details on https://lightray.io/diffuser/ (!) Avoid apps that don’t require a diffuser! They are inaccurate because they ignore the basic physics of light measurement. TRY BEFORE YOU BUY The LM-3000 is free to download and comes with a free trial period. The trial period lasts for two non-consecutive days, giving you enough time to see if the app fits your needs. The status of your free trial will be shown as the "battery level" on the top right of the LM-3000's display and on the "Battery Status" screen. Once your light meter's "battery" is depleted, you may choose a Charging Option to keep using the app. You can pick what works best for you: → Single Charge — top-up for another 48 hours (perfect for occasional use), → Continuous Charging — a monthly subscription (great if you use it regularly), → Unlimited Battery — a one-time purchase for unlimited lifetime access LM-3000 is the result of over five years of dedicated research and development, ensuring you get a tool that is precise and reliable. Every in-app purchase supports future development and helps keep the app ad-free for everyone. As a member of 1% for the Planet, we donate at least one percent of all revenue to environmental non-profits — this is our way of giving back. ACCURACY Accuracy is not an afterthought — Apps developed by Lightray Innovation are developed according to the ISO/CIE 19476 standard. Thanks to RAW image processing and a default calibration per device model they’re able to match the performance of high quality traditional hardware light meters. To ensure quality we rigorously test our apps regularly on upcoming devices. DOWNLOAD FOR FREE. TRUSTED BY MILLIONS. LM-3000 is the go-to light meter for photographers, professionals, engineers, and lighting enthusiasts who rely on accurate measurements — not estimates or guesswork. Download for free today and experience the difference! See the app in action: https://youtu.be/EJW7NfE2qCk Terms and Conditions: https://lightray.io/lightmeter/terms/

About

MadgeTech

This app enables mobile connectivity and control for specific data loggers. It allows users to program settings, start/stop logging, download data, view historical records, and generate reports, all via Bluetooth. Data can be easily shared through text or email.

Highlights
  • Bluetooth connectivity
  • Program device settings
  • Start and stop logging
  • Download logged data
  • View historical data
  • Generate reports
  • Share data instantly
Features
Read full description

Discover a world of seamless data logging connectivity with MadgeTech, tailored exclusively for the LynxPro Series of data loggers. Features: • Bluetooth Connectivity: Instantly connect your LynxPro data logger via Bluetooth for real-time access and control. • Program on the Go: Easily program your device settings, ensuring that you capture the data you need, when you need it. • Start & Stop: Begin and end logging sessions with a single tap. Convenience meets efficiency. • Download Devices: Quickly and effortlessly download logged data, making data retrieval a breeze. • Historical Data Viewing: Dive deep into your past data, ensuring that you always have a comprehensive overview of all your logging sessions. • Comprehensive Reporting: Generate detailed and informative reports, tailor-made to fit your needs. • Share Anytime, Anywhere: Whether you're presenting to a team, sharing findings with a colleague, or sending data for further analysis, our instant sharing via text or email ensures you're always connected.

Screenshots

Light Meter LM4 screens
MadgeTech4 screens

Verdict

The call

The clearest difference is rating: MadgeTech at 5.0 against Light Meter LM's 4.5. MadgeTech also leads on in-app purchases (none vs 3) and iOS requirement (13.0 vs 15.0). Light Meter LM's advantage is ratings volume (2.6K vs 3). On price, update cadence, ads and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Light Meter LM sells 3 in-app purchases, starting at $3.49 per month. MadgeTech asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

MadgeTech 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 3, so its average is the more settled of the two.

UpkeepUpdate frequency

Light Meter LM ships an update monthly, MadgeTech every 5 weeks. The most recent releases landed on October 18, 2026 and October 5, 2026 respectively.

Scorecard5 real differences · 5 level
Light Meter LM versus MadgeTech: the parameters behind the verdict, then further details
ParameterLight Meter LMMadgeTech
PriceFreeFree
Rating4.5 (2.6K ratings)5.0 (3 ratings) — better
Positive reviews40.3% of reviews—
Number of ratings2.6K — better3
Update frequencyMonthly — betterEvery 5 weeks
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.013.0 — better
Further details — not scored
Size22 MB38 MB
Age rating4+4+
DeveloperLightray Innovation GmbHMadgeTech

Customer experience

Light Meter LM

All ratings2,583 ratings
Positive88.0%
Neutral3.7%
Negative8.4%
Written reviews206 reviews
Positive40.3%
Neutral5.8%
Negative53.9%

MadgeTech

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

Light Meter LM

Reported bugs

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

Requested features

3 requests
  • Ability to use rear camera
  • More flexible diffuser options
  • Improved accuracy without diffuser

MadgeTech

Not enough reviews yet to summarise bugs or requests.

In-app purchases

3 purchases

Light Meter LM

Subscriptions1
  • Continuous Charging$3.491 Month
One-time2
  • Single Charge$0.99
  • Unlimited Battery$19.99
None

MadgeTech

No in-app purchases

Questions

Is Light Meter LM free?
Light Meter LM is free to download, with in-app purchases available.
Is MadgeTech free?
MadgeTech is free to download, with no in-app purchases.
Which has better reviews, Light Meter LM or MadgeTech?
MadgeTech is rated higher. Light Meter LM averages 4.5 out of 5 from 2.6K ratings, while MadgeTech averages 5.0 from 3 ratings.
Do Light Meter LM or MadgeTech have ads?
Neither Light Meter LM nor MadgeTech shows ads.
Which is updated more often, Light Meter LM or MadgeTech?
Light Meter LM ships an update monthly, and MadgeTech every 5 weeks. Most recently, Light Meter LM was updated on October 18, 2026 and MadgeTech on October 5, 2026.

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