Comparison

RF Engineer's Calc 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

RF Engineer's Calc

Features
Read full description

A simple RF Engineer's Calculator. Convert Watts to dBm, calculate dBm power changes, convert Return Loss to VSWR, etc...

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 FLIR discontinued its Mac software and Fluke's mobile viewer is no longer maintained.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

RF Engineer's Calc3 screens
Thermal Viewer4 screens

Verdict

The call

The clearest difference is in-app purchases: RF Engineer's Calc at none against Thermal Viewer's 3. Thermal Viewer's advantage is update cadence (every 6 days vs every 10 months) and device support (4 vs 1). On price, ads and iOS requirement 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. RF Engineer's Calc asks for nothing beyond the download.

UpkeepUpdate frequency

RF Engineer's Calc ships an update every 10 months, Thermal Viewer every 6 days. The most recent releases landed on October 6, 2026 and October 18, 2026 respectively.

Scorecard3 real differences · 7 level
RF Engineer's Calc versus Thermal Viewer: the parameters behind the verdict, then further details
ParameterRF Engineer's CalcThermal Viewer
PriceFreeFree
Rating—5.0 (2 ratings) — better
Positive reviews—100.0% of reviews
Number of ratings—2 — better
Update frequencyEvery 10 monthsEvery 6 days — better
AdsNoNo
In-app purchasesNo — betterYes
Monetization—Freemium
DevicesiPhoneiPhone, iPad, iPod, Mac — better
Requires iOS16.115.0 — better
Further details — not scored
Size43 MB35 MB
Age rating4++4
DeveloperGRAHAM JOHN SMITHRush Tools LLC

In-app purchases

None

RF Engineer's Calc

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 RF Engineer's Calc free?
RF Engineer's Calc is free to download, with no in-app purchases.
Is Thermal Viewer free?
Thermal Viewer is free to download, with in-app purchases available.
Do RF Engineer's Calc or Thermal Viewer have ads?
Neither RF Engineer's Calc nor Thermal Viewer shows ads.
Which is updated more often, RF Engineer's Calc or Thermal Viewer?
RF Engineer's Calc ships an update every 10 months, and Thermal Viewer every 6 days. Most recently, RF Engineer's Calc was updated on October 6, 2026 and Thermal Viewer on October 18, 2026.

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