Comparison

HeatSight vs Thermal Viewer

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

Head to head
About

HeatSight

Features
Read full description

FEATURES • Real-time thermal imaging via WiFi (UDP/TCP) • 5 color palettes: Ironbow, Rainbow, White Hot, Black Hot, Lava • Touch anywhere to read exact temperature • Hot/cold spot auto-tracking • Anomaly detection highlights unusual temperatures • GPU-accelerated upscaling (1x–8x) with edge-aware sharpening • Frame averaging for noise reduction • Radiometric snapshots — save and re-analyze thermal data • CSV export for data analysis • Recording and playback • Celsius/Fahrenheit with emissivity presets • Temperature reference guide for home inspection, electrical, HVAC • Battery level monitoring • Works without hardware in Demo Mode REQUIREMENTS • Waveshare ESP32-S3 Thermal Camera Module • Custom firmware (open source, included on GitHub) • WiFi connection to the ESP32 module

About

Thermal Viewer

Analyze radiometric thermal images directly on your iPhone, iPad, or Mac. This app supports various thermal image formats and offers detailed temperature analysis, including spot, box, and ellipse measurements. It allows for live re-analysis and export of data and settings, all while keeping your images private and offline.

Highlights
  • Analyze radiometric thermal images
  • Supports multiple thermal file formats
  • Tap to read exact temperature
  • Add spot, box, ellipse, and line measurements
  • Live re-analysis with adjustable parameters
  • Visible-light blend and MSX-style overlay
  • Export temperature matrix to CSV
  • Batch export of images and settings
Features
Read full description

Thermal Viewer opens and analyzes radiometric thermal images right on your iPhone, iPad, and Mac. No Windows PC, no camera accessory, and no account. Searching for "FLIR Tools for Mac" or a SmartView alternative? This is the native app you have been missing. FLIR discontinued its Mac software and Fluke's mobile viewer is no longer maintained. Thermal Viewer fills that gap, fully offline. WORKS WITH • FLIR radiometric JPEG: E-series, T-series, Cx, FLIR ONE, CAT phones • Fluke IS2 files • Radiometric TIFF (ResearchIR, Vue / Duo Pro R) • InfiRay / P2 Pro thermal JPEG • DJI thermal JPEG (image and capture parameters) • Plain thermal JPEGs EVERY PIXEL IS A TEMPERATURE Tap anywhere to read the exact temperature. Add spot, box, ellipse and line measurements with min / avg / max, and Delta-T between any two of them. PROFESSIONAL ANALYSIS • 8 color palettes plus your camera's own palette • Level/span with histogram, isotherms, automatic hot and cold markers • Live re-analysis: change emissivity, reflected temperature and distance, and temperatures recompute instantly • Visible-light blend, picture-in-picture, and MSX-style edge overlay • °C / °F / K • Full camera, lens, GPS and parameter inspector EXPORT & BATCH • Export the full temperature matrix to CSV • Export rendered images (PNG) and reproducible analysis settings (JSON) • Hotspot Triage: scan a whole folder and flag every image above your threshold • Batch export PRIVATE BY DESIGN Everything runs on your device. Your images never leave your phone: no cloud, no account, no tracking. Thermal Viewer is an independent app and is not affiliated with, endorsed by, or sponsored by FLIR, Teledyne, Fluke, DJI, or InfiRay. Brand names are used only to indicate supported file formats. Privacy Policy: https://rush.tools/privacy Terms of Use: https://rush.tools/terms

Screenshots

HeatSight3 screens
Thermal Viewer4 screens

Verdict

The call

The clearest difference is rating: Thermal Viewer at 5.0 against HeatSight's 1.0. Thermal Viewer also leads on device support (4 vs 2) and iOS requirement (15.0 vs 26.1). HeatSight's advantage is in-app purchases (none vs 3). On price, ratings volume and ads 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. Thermal Viewer sells 3 in-app purchases, starting at $4.99 per 7 days. HeatSight asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Thermal Viewer holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 1 and 2 respectively.

Scorecard4 real differences · 6 level
HeatSight versus Thermal Viewer: the parameters behind the verdict, then further details
ParameterHeatSightThermal Viewer
PriceFreeFree
Rating1.0 (1 ratings)5.0 (2 ratings) — better
Positive reviews—50.0% of reviews
Number of ratings12 — better
Update frequency—Weekly
AdsNoNo
In-app purchasesNo — betterYes
Monetization—Freemium
DevicesiPhone, iPadiPhone, iPad, iPod, Mac — better
Requires iOS26.115.0 — better
Further details — not scored
Size6 MB35 MB
Age rating4+4+
DeveloperTaylor GalbraithRush Tools LLC

In-app purchases

None

HeatSight

No in-app purchases

3 purchases

Thermal Viewer

Subscriptions2
  • Pro Weekly3 Days trial$4.997 Days
  • Pro Yearly$29.991 Year
One-time1
  • Lifetime Access$49.99

Questions

Is HeatSight free?
HeatSight is free to download, with no in-app purchases.
Is Thermal Viewer free?
Thermal Viewer is free to download, with in-app purchases available.
Which has better reviews, HeatSight or Thermal Viewer?
Thermal Viewer is rated higher. HeatSight averages 1.0 out of 5 from 1 ratings, while Thermal Viewer averages 5.0 from 2 ratings.
Do HeatSight or Thermal Viewer have ads?
Neither HeatSight nor Thermal Viewer shows ads.

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