LightSpectrum Pro vs Decy
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
LightSpectrum Pro
Measure light source color temperature and spectrum accurately without expensive equipment. View the color spectrum from 360nm to 800nm, and analyze the white point on the CIE 1931 diagram. Overlay filtered wavelengths on camera images to see frequency reflections and intensity.
- Color temperature measurement
- Color spectrum analysis (360nm-800nm)
- CIE 1931 white point display
- Wavelength filtering and overlay
- High accuracy compared to professional devices
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With LightSpectrumPro EVO you can measure the color temperature of a light source without having to spend hundreds of dollars on professional devices. LightSpectrumPro EVO has an error of 2 - 8% compared to existing professional products on the market. in addition to the color temperature measurement in Kelvin, LightSpectrumPro EVO allows you to view the color spectrum of the light being examined with a band ranging from 360nm to 800nm. in addition to the spectrum it is possible to display the position of the white point on the CIE 1931 diagram and to apply a filter for wavelengths to display in overlay on the image captured by the cameras which elements reflect a specific frequency and with what intensity.
Decy
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How old are your ears? Find out with Decy. Decy is a precision decibel meter and hearing health companion. Measure the sound around you in real time, discover your hearing age with our viral test, and explore how loud your city really is on the community noise map. HEARING AGE TEST Take the 2-minute frequency test and find out how old your ears really are. Share your result card with friends and compare — can they hear what you hear? REAL-TIME DECIBEL METER Watch sound levels update live on a clean, precise gauge. A-weighted and C-weighted measurements with LAeq, LCpeak, and TWA metrics — the same standards professionals use. ALL-DAY NOISE MONITORING Start a session in the morning and let Decy track your workplace noise exposure all day, even in the background. NIOSH-based dose tracking tells you when your ears need a break. COMMUNITY NOISE MAP See real noise levels pinned by users around the world. Drop your own measurements on the map and help build the world's living sound atlas. HEARING HEALTH TRACKING Get a daily hearing health score based on your actual noise exposure. Review your 30-day history and understand your habits. AI TREND ANALYSIS Let AI analyze your exposure patterns and hearing test results, then give you personalized insights and recommendations — updated daily. PDF HEALTH REPORTS Export professional hearing health reports to share with your doctor or keep for your records. WIDGETS & ALERTS Add the home screen widget for at-a-glance sound levels. Set threshold alerts so you know the moment your environment gets too loud. WHY DECY? - Audio is never recorded — sound is measured, not stored - No account required, no personal data collected - Noise map contributions are fully anonymous - Free core features, Premium unlocks the full experience PREMIUM Unlock the Hearing Age Test results, Noise Map, AI analysis, PDF reports, unlimited history, and detailed widgets with a Weekly or Annual subscription. Subscriptions auto-renew until canceled. Cancel anytime in your App Store settings. Terms of Use: https://codcy.com/terms-of-use-decibel-meter-noise-map/ Privacy Policy: https://codcy.com/privacy-policy-decibel-meter-noise-map/ Your ears will thank you. Download Decy today.
Screenshots
Verdict
The clearest difference is price: Decy at Free against LightSpectrum Pro's $1.99. Decy also leads on update cadence (every 5 weeks vs every 3 months). LightSpectrum Pro's advantage is in-app purchases (none vs 3) and chart position (#104 vs unranked). On 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
Decy is free to download; LightSpectrum Pro costs $1.99 up front. Decy sells 3 in-app purchases, starting at $9.99 per 7 days. LightSpectrum Pro asks for nothing beyond the download.
LightSpectrum Pro ships an update every 3 months, Decy every 5 weeks. The most recent releases landed on November 6, 2026 and November 5, 2026 respectively.
| Parameter | LightSpectrum Pro | Decy |
|---|---|---|
| Price | $1.99 | Free — better |
| Rating | 4.1 (39 ratings) — better | — |
| Positive reviews | 28.5% of reviews | — |
| Number of ratings | 39 — better | — |
| Update frequency | Every 3 months | Every 5 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Best chart rank | #104 — better | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.6 — better | 18.6 |
| Further details — not scored | ||
| Size | 88 MB | 30 MB |
| Age rating | 4+ | 4+ |
| Developer | AM PowerSoftware | YAVUZ BAS |
Bugs and requests
LightSpectrum Pro
Reported bugs
11 issues- App crashes on startup or during use
- Camera feed not accessible or showing red X icon
- Screen blinking/flashing on first launch
- UI elements cut off on larger screens
- Buttons unresponsive or sticky
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- App freezes and cannot be exited
- Black screen on launch
- Inconsistent readings that change rapidly
- App stuck on opening screen
- Camera focus issues on iPhone X and newer models
- Incompatibility with iOS 5, 6, and newer iPhone models
Requested features
11 requests- Spot metering with crosshairs or target reticle
- Direct DUV (Delta uv) display calculation
- Flicker detection for light sources
- Calibration function for improved accuracy
- Support for fluorescent light preset adjustments
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- Tap-to-focus camera control
- Landscape orientation support
- Ability to disable tutorial tips
- Screenshot capability in landscape mode
- Better documentation and user guide
- Device compatibility information in app store listing
Decy
Not enough reviews yet to summarise bugs or requests.
In-app purchases
LightSpectrum Pro
No in-app purchases
Decy
- Weekly$9.997 Days
- Premium Monthly$14.991 Month
- Premium Yearly$49.991 Year
Questions
Is LightSpectrum Pro free?
Is Decy free?
Do LightSpectrum Pro or Decy have ads?
Which is updated more often, LightSpectrum Pro or Decy?
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