TLS VIEWER vs Color Temperature Meter+
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
TLS VIEWER
This app provides a straightforward NDI monitor with multiview functionality. It includes essential tools like false color and histogram for video analysis. Designed for efficient visual monitoring of NDI sources.
- NDI monitoring
- Multiview capabilities
- False color tools
- Histogram analysis
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TLS Viewer turns your iPhone or iPad into a wireless video-village monitor for NDI® sources on your local network. Made by a working video-assist operator for film and commercial sets, it does one thing well: show the feed, clearly, with the tools you reach for between takes. WHAT IT DOES • Finds NDI® senders on the same Wi-Fi automatically. No IP addresses to type. • Single-source monitor with pinch-to-zoom and pan for focus checks. • Multi-view grid to keep several sources on one screen. • Histogram and false colour for exposure calls. • Live link stats: frame rate, latency, dropped frames, so you know when the network is the problem. • Bandwidth switch: full quality on a clean network, proxy mode when the Wi-Fi is crowded. • Reconnects on its own when the network changes. The last frame stays on screen with a clear status chip. • Keeps the screen awake while you are monitoring. Tap once to hide all controls. WORKS WITH Any NDI® sender on your network: switchers, capture apps, cameras, and video-assist systems that publish NDI®. A built-in demo source lets you explore every tool without a sender. PRIVACY TLS Viewer collects nothing. No account, no analytics, no tracking. Video stays on your local network. NDI® is a registered trademark of Vizrt NDI AB. TLS Viewer is an independent product of Tech Lab Studio and is not affiliated with or endorsed by Vizrt NDI AB.
Color Temperature Meter+
Measure light color temperature in Kelvin using your iPhone camera. Get real-time readings, identify light types, and receive white balance suggestions for photography and videography. Save and compare past measurements.
- Real-time Kelvin display
- Light type classification
- White balance suggestions
- Freeze mode for comparison
- Mired display option
- Measurement history
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Color Temperature Meter+ measures the colour temperature of the light around you in Kelvin, with tint, mired and the camera white balance to match, straight from your iPhone's camera. ▶ HOW IT MEASURES On iPhone the app reads the camera's own estimate of the light falling on the scene, the same estimate iOS uses to set white balance. Point the camera at a plain white or grey surface lit by the light you want to measure, not at the lamp itself. The reading settles within seconds and shows a ± range, so you can see how steady it is. When that estimate is not available, the app samples the centre of the frame instead, and you can calibrate it once on white paper in daylight. ▶ WHAT YOU SEE • Kelvin with a ± range, updating live • Mired value for filter and gel maths • Light type: golden hour, tungsten, fluorescent, LED, daylight, cloudy, shade • Tint (green or magenta) and Duv • Spectrum bar from 1,000 K to 15,000 K • The nearest camera white-balance preset: tungsten, fluorescent, flash, daylight, cloudy or shade ▶ FREEZE AND SAVE Tap Freeze to hold the current reading. A result card shows the Kelvin, mired, light type and matching white-balance preset, with Save Reading and Measure Again right below it. Saved readings keep their date and time. The latest 50 are kept, you can delete any of them, and you can export the list as CSV. ▶ PHOTOGRAPHY WB ASSIST Pick a target of 3200 K, 4300 K, 5500 K or 6500 K. The app shows the mired shift from the measured light to that target, the Kelvin to dial into your camera's custom white balance, and the CTO or CTB gel strength that closes the gap, from 1/8 upwards. ▶ REFERENCE CHART Thirteen common light sources, from candle flame (1,900 K) to clear blue sky (10,000 K), to compare with what you measured. ▶ HONEST LIMITS A phone camera is not a spectrometer. The app reports correlated colour temperature and tint, which is what matters for matching white balance and choosing gels. It does not measure spectral power distribution, CRI or TLCI, and two lamps with the same colour temperature but different spectra read the same. Mixed lighting gives a blend of the sources. Use it to set up shoots, match bulbs and check rooms; use a dedicated colour meter for critical colour work. ▶ PRIVACY Camera images are analysed on your device and are never uploaded. Available in 30 languages.
Screenshots
Verdict
The clearest difference is rating: Color Temperature Meter+ at 4.2 against TLS VIEWER's 1.0. Color Temperature Meter+ also leads on update cadence (every 5 days vs every 6 months) and ratings volume (5 vs 1). TLS VIEWER's advantage is ads (none vs shown) and monetization model (free vs ad-supported). On price, 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Color Temperature Meter+ holds the better App Store score, 4.2 against 1.0. That said, the two scores are not equally well evidenced: Color Temperature Meter+ has 5 ratings behind it against 1, so its average is the more settled of the two.
TLS VIEWER ships an update every 6 months, Color Temperature Meter+ every 5 days. The most recent releases landed on October 7, 2026 and October 11, 2026 respectively.
| Parameter | TLS VIEWER | Color Temperature Meter+ |
|---|---|---|
| Price | Free | Free |
| Rating | 1.0 (1 ratings) | 4.2 (5 ratings) — better |
| Positive reviews | — | 50.0% of reviews |
| Number of ratings | 1 | 5 — better |
| Update frequency | Every 6 months | Every 5 days — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free — better | Ad-supported |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 26.2 | 16.4 — better |
| Further details — not scored | ||
| Size | 9 MB | 65 MB |
| Age rating | 4+ | 17+ |
| Developer | Jeremie Aubut | Kyu-Hee Jang |
Customer experience
TLS VIEWER
Color Temperature Meter+
In-app purchases
TLS VIEWER
No in-app purchases
Color Temperature Meter+
No in-app purchases
Questions
Is TLS VIEWER free?
Is Color Temperature Meter+ free?
Which has better reviews, TLS VIEWER or Color Temperature Meter+?
Do TLS VIEWER or Color Temperature Meter+ have ads?
Which is updated more often, TLS VIEWER or Color Temperature Meter+?
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