LightSpectrum Pro vs Mr. Slate
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.
Mr. Slate
This app provides a straightforward digital film slate for video production. It allows users to input essential information, display it on screen, and trigger a visual and auditory cue for syncing audio and video in post-production. It's designed for simplicity and effectiveness.
- Digital film slate functionality
- Input essential production information
- Visual red flash cue
- Auditory clap sound cue
- Audio and video sync aid
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Movie slates are used to display useful info to the video editor and allow the editor to sync audio and video. This is a SUPER simple movie slate app. It's not fancy, but it does the job. Just type in the information, show it to the camera and hit "clap". A red flash will appear and a clap sound will play. From there you should be able to sync your audio and video in post just as you would with any other movie slate. If you have any ideas for improvements please let me know via a 5 star review or via email mail@brendenvogt.com Enjoy
Screenshots
Verdict
The clearest difference is price: Mr. Slate at Free against LightSpectrum Pro's $1.99. Mr. Slate also leads on update cadence (daily vs every 3 months) and iOS requirement (9.0 vs 15.6). LightSpectrum Pro's advantage is rating (4.1 vs 2.2) and chart position (#50 vs unranked). On review sentiment, ads, in-app purchases and monetization model 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
Mr. Slate is free to download; LightSpectrum Pro costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
LightSpectrum Pro holds the better App Store score, 4.1 against 2.2. That said, the two scores are not equally well evidenced: LightSpectrum Pro has 39 ratings behind it against 6, so its average is the more settled of the two. Written reviews point the same way: 28% of LightSpectrum Pro's written reviews are positive against 25% of Mr. Slate's.
LightSpectrum Pro ships an update every 3 months, Mr. Slate daily. The most recent releases landed on October 30, 2026 and October 24, 2026 respectively.
| Parameter | LightSpectrum Pro | Mr. Slate |
|---|---|---|
| Price | $1.99 | Free — better |
| Rating | 4.1 (39 ratings) — better | 2.2 (6 ratings) |
| Positive reviews | 28.5% of reviews — better | 25.0% of reviews |
| Number of ratings | 39 — better | 6 |
| Update frequency | Every 3 months | Daily — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Best chart rank | #50 — better | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.6 | 9.0 — better |
| Further details — not scored | ||
| Size | 88 MB | 16 MB |
| Age rating | 4+ | 4+ |
| Developer | AM PowerSoftware | Brenden Vogt |
Customer experience
LightSpectrum Pro
Mr. Slate
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
Mr. Slate
Not enough reviews yet to summarise bugs or requests.
In-app purchases
LightSpectrum Pro
No in-app purchases
Mr. Slate
No in-app purchases
Questions
Is LightSpectrum Pro free?
Is Mr. Slate free?
Which has better reviews, LightSpectrum Pro or Mr. Slate?
Do LightSpectrum Pro or Mr. Slate have ads?
Which is updated more often, LightSpectrum Pro or Mr. Slate?
Other comparisons
