Comparison

Qalculator vs uSpectrumX BLE

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

Head to head
About

Qalculator

This app provides specialized calculation tools for media professionals in film, TV, theatre, and events. It offers utilities for lighting, projection, cameras, audio, and more, simplifying complex industry tasks.

Highlights
  • Lighting beam calculations
  • Projection tools
  • Camera distance and focal length calculations
  • Audio delay and phase offset calculations
  • Display size and bandwidth calculations
  • Tap BPM and DIP switch utilities
Features
Read full description

Qalculator is a convenient tool for media professionals. Qalculator offers a variety of different calculation tools and utilities all of which are made for tasks often performed within the Film-/TV-, Theatre- and Event Industry. This includes: - Lighting Beam Calculation - Projection Tools - Camera Tools - Audio Tools - Tap BPM - Display Size - DIP Switches - Bandwidth Calculation - Frames To Time This app is designed for professionals such as Sound Engineers, Audio Technicians, Lighting Designers, Lighting Technicians, Lighting Operators, Video Engineers, Video Technicians, Camera Men, Camera Technicians and many more. How big will the projected image be if I use a lens factor of 1,5:1 and have my projector at 32' 5" distance from the screen? Qalculator will help! Want to know which focal length you need to get a close up shot? Qalculator assists you. Ever wanted to know how wide a 103" Screen is? Qalculator delivers the solution at your fingertip. Feedback and feature requests are very welcome! Qalculator does: - Lighting beam diameter calculation - Lighting beam object distance calculation - Video projector image size calculation - Video projection lens factor for given image size and projection distance - Video projection distance for given image size and lens factor - Video projection approximate brightness calculation (lux/fc) - Camera distance for given focal length and field of view - Camera focal length for given distance and field of view - Camera field of view for given object distance and focal length - Camera chip size selector for a variety of different chip sizes - Audio delay time for given distance with respect to temperature - Audio wavelengths and travel times for given frequency with respect to temperature - Audio find phase offset and delay for instance for bass speaker arrays - Display Size calculates the complete dimensions for diagonal screen sizes - Tap BPM tap to calculate the average beats per minute - DIP Switches for DMX addressing of DIP switch based devices - DIP Switch offset to step through the DMX address fixture per fixture - Transfer time calculation for a given file size and bandwidth … and more.

About

uSpectrumX BLE

Features
Read full description

The uSpectrumX BLE is a lightweight, portable, easy-to-operate spectrometer with BLE remote control operations and SD card data storage. This product has basic features for fast, easy lighting readings, as well as advanced light analytics, and efficient work-flow features for lighting production environments. Supported Devices ・MK350D (≧ FW Ver.1.2.0.B9) # uSpectrumX BLE will continuously add more supported devices in the future.

Screenshots

Qalculator4 screens
uSpectrumX BLE3 screens

Verdict

The call

The clearest difference is price: uSpectrumX BLE at Free against Qalculator's $2.99. uSpectrumX BLE also leads on iOS requirement (9.0 vs 15.6). Qalculator's advantage is update cadence (every 4 months vs every 14 months). On ads, in-app purchases 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

uSpectrumX BLE is free to download; Qalculator costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Qalculator ships an update every 4 months, uSpectrumX BLE every 14 months. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

Scorecard3 real differences · 7 level
Qalculator versus uSpectrumX BLE: the parameters behind the verdict, then further details
ParameterQalculatoruSpectrumX BLE
Price$2.99Free — better
Rating5.0 (5 ratings) — better—
Positive reviews90.0% of reviews—
Number of ratings5 — better—
Update frequencyEvery 4 months — betterEvery 14 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaid—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.69.0 — better
Further details — not scored
Size2 MB33 MB
Age rating4+4+
DeveloperQConcept GmbH & Co. KGUnited Power Research Technology Corporation

In-app purchases

None

Qalculator

No in-app purchases

None

uSpectrumX BLE

No in-app purchases

Questions

Is Qalculator free?
Qalculator costs $2.99, with no in-app purchases.
Is uSpectrumX BLE free?
uSpectrumX BLE is free to download, with no in-app purchases.
Do Qalculator or uSpectrumX BLE have ads?
Neither Qalculator nor uSpectrumX BLE shows ads.
Which is updated more often, Qalculator or uSpectrumX BLE?
Qalculator ships an update every 4 months, and uSpectrumX BLE every 14 months. Most recently, Qalculator was updated on November 1, 2026 and uSpectrumX BLE on November 3, 2026.

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