Comparison

uSpectrumX vs PPFD METER

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

Head to head
About

uSpectrumX

Features
Read full description

uSpectrumX is a wireless controller application for UPRTek handheld spectrometer which provides 6 main features, namely Basic, Spectrum, CIE1931, CIE1976, CRI, and TM-30. Supported Devices ・MK350S Premium (≧ FW Ver.1.1.0.B24) ・MK350N Premium (≧ FW Ver.1.1.1.B6) # uSpectrumX will continuously add more supported devices in the future. Connect to Handheld Spectrometer via Wi-Fi ・To remotely analyze light source target. ・To remotely configure the "Integration Mode" of device ・To remotely run "Dark Calibration" of device. ・To save the captured data of device. More Features ・To show Spectrum, CIE1931, CIE1976, CRI, TM-30 diagram of the data(*.xls), which was generated from UPRTek handheld spectrometer. ・To see more detail information of light source, such as LUX, CCT, CRI, x, y, λp, and λpV. ・To share the measured data via email. ・To choose uSpectrumX to open UPRTek xls file from other apps.

About

PPFD METER

This app measures light intensity for plants, converting LUX to PPFD and DLI. It offers advanced light mapping, uniformity analysis, and efficiency insights to optimize plant growth. Customize profiles for different environments and growth stages.

Highlights
  • LUX, PPFD, DLI, and PAR measurements
  • Light mapping and distribution analysis
  • Uniformity and PPF evaluation
  • Energy efficiency and consumption tracking
  • Customizable setting profiles
  • Bluetooth sensor integration
Read full description

Perfect for both seasoned gardeners and beginners, PPFD Meter sets itself apart from standard grow light meter apps with its comprehensive features and intuitive design. Using your phone's built-in sensors or the acclaimed UNI-T UT383 BT sensor via Bluetooth, PPFD Meter provides precise and reliable light measurements. This accuracy is essential for understanding and optimizing the light your plants receive, ensuring their health and growth. PPFD Meter is more than a light measurement tool; it's a guide to understanding your plants' needs. It converts LUX readings into PPFD (Photosynthetic Photon Flux Density) and DLI (Daily Light Integral), providing critical insights for your lighting setup. Customize up to five different settings profiles for various environments or growth stages, making your plant care as unique as your garden. Advanced Light Mapping and Analysis Step into a new era of light management with PPFD Meter's advanced light mapping capabilities. Our exclusive PAR and DLI Maps feature offers a vivid, detailed representation of light distribution across your grow area, enabling precise adjustments for optimal plant growth. But that's just the beginning: In-Depth Light Analysis: Measure light uniformity to ensure even plant growth, and evaluate your setup's PPF (Photosynthetic Photon Flux) to understand the total light output. Efficiency and Consumption Insights: Assess the efficiency of your lighting system in converting energy into usable light. Track the daily total energy consumption to manage your energy usage and environmental impact effectively. Comprehensive DLI Tracking: Monitor the Daily Light Integral, a key factor in regulating plant health and growth cycles, ensuring your plants receive the right amount of light each day. These advanced features make PPFD Meter not just an app, but a vital partner in your indoor gardening journey. It’s a leap forward from typical grow light meter apps, offering a depth of analysis and customization that truly enhances your plant care experience. Download PPFD Meter today and embark on a journey of precision and expertise in plant care. Your plants will thrive like never before! Privacy Policy: https://www.ppfd.app/pp Terms of Service: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

uSpectrumX4 screens
PPFD METER4 screens

Verdict

The call

The clearest difference is in-app purchases: uSpectrumX at none against PPFD METER's 3. uSpectrumX also leads on ads (none vs shown) and iOS requirement (9.0 vs 18.0). PPFD METER's advantage is update cadence (every 3 weeks vs every 3 months). On price 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. PPFD METER sells 3 in-app purchases, starting at $1.99 per month. uSpectrumX asks for nothing beyond the download.

UpkeepUpdate frequency

uSpectrumX ships an update every 3 months, PPFD METER every 3 weeks. The most recent releases landed on September 16, 2026 and September 22, 2026 respectively.

Scorecard4 real differences · 6 level
uSpectrumX versus PPFD METER: the parameters behind the verdict, then further details
ParameteruSpectrumXPPFD METER
PriceFreeFree
Rating—4.6 (118 ratings) — better
Positive reviews—52.6% of reviews
Number of ratings—118 — better
Update frequencyEvery 3 monthsEvery 3 weeks — better
AdsNo — betterYes
In-app purchasesNo — betterYes
Monetization—Free with in-app purchases
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS9.0 — better18.0
Further details — not scored
Size25 MB43 MB
Age rating4+4+
DeveloperUnited Power Research Technology CorporationCandas Pamukcu

In-app purchases

None

uSpectrumX

No in-app purchases

3 purchases

PPFD METER

Subscriptions2
  • Premium$1.991 Month
  • Premium Plus$2.991 Month
One-time1
  • Remove Ads$29.99

Questions

Is uSpectrumX free?
uSpectrumX is free to download, with no in-app purchases.
Is PPFD METER free?
PPFD METER is free to download, with in-app purchases available.
Do uSpectrumX or PPFD METER have ads?
PPFD METER shows ads; uSpectrumX does not.
Which is updated more often, uSpectrumX or PPFD METER?
uSpectrumX ships an update every 3 months, and PPFD METER every 3 weeks. Most recently, uSpectrumX was updated on September 16, 2026 and PPFD METER on September 22, 2026.

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