# Thermal Light > Measures high temperatures of objects using black body radiation and iPhone camera. (iPhone/iPad app by Crystal Clear Solutions.) - Source: https://appshunter.io/ios/app/thermal-light/id476998738 (this page in markdown: same URL + `.md`) - Developer: [Crystal Clear Solutions](https://appshunter.io/developer/444062170) - Category: Utilities, Productivity - Price: $1.99 - Rating: 2.60/5 from 5 App Store ratings · 12 written reviews indexed - Age rating: 4+ - Requires: iOS 16.6 · 2 MB - Languages: American English - Released: 2011-11-04 - Data updated: 2026-09-08 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/thermal-light/id476998738/reviews.md ## What is Thermal Light? Thermal Light is the first of its kind app that uses black body radiation of an object (iron/steel, copper, ceramics) to determine temperatures between 1000F and 2700F. Very hot objects irradiate light; the app uses this light to determine the temperature between 1000 and 2700F. The app has been calibrated against a certified IR thermometer. Why spend $900 for an IR or optical thermometer when you can convert your iPhone to do the same thing? This is great for knowing the temperature of your steel for working. Temperature increments are 50F. Please go to support website for more details at http://houseofficer.com/forgingtemperature ## Key features - Measures temperatures from 1000F to 2700F - Uses black body radiation analysis - Calibrated against certified IR thermometer - Cost-effective alternative to IR thermometers - Supports iron, steel, and ceramics ## Recent user reviews (10 of 12) All indexed reviews: https://appshunter.io/ios/app/thermal-light/id476998738/reviews.md ### 1/5 — Dead app please update *2019-03-19* I love this app and have used it for years to double check my heat treat oven calibration It is no longer compatible with iPhone OS and does not work at all now If they ever update I’ll change my review to 4 stars ### 1/5 — Refund please *2019-03-05* The app won’t even open the camera to calibrate ### 1/5 — Hard to calibrate *2017-04-29* I found the app very hard to calibrate and it needs to be calibrated before every use. Even if the phone goes into standby it needs recalibration. Effectively making this app useless ### 1/5 — DO NOT BUY *2013-04-14* Pice of crap app ### 2/5 — No luck. *2012-12-27* I thought this would be handy for HTing knives, but I haven't had any luck with it. I tried calibrating then using it to read a steel that I knew the austentitic temp for, in light and dark, but could not get an accurate read. ### 5/5 — Don't melt your phone *2012-12-21* I tried this app out on my ceramic kiln. Worked very well. impressive. Handy backup for my high temperature thermometer. ### 1/5 — Metal casting furnace *2012-04-26* Of all the apps I have bought this one is almost totally useless. To calibrate you are supposed to point it at a light and keep trying until you get the x in the magic spot. So I do this for the low temp then the high. But find out that whatever one you have it calibrated it losses the previous calibration. Oh well I think I can work around that so I calibrate it again for the low temperature. Note: I did this in my garage at night. Then stepping outside to where my metal melting furnace is running. Now the thing says it needs calibrated again. So one more time trying to calibrate this at the operating furnace. I can not get it to calibrate looking down in the glory hole where my crucible is. This even though the crucible is red hot . At this time on a scale of one to ten = 0 ### 5/5 — Useful tool for the shop *2011-11-17* Well worth the purchase. Simple to use and very helpful. ### 5/5 — Amazing *2011-11-16* Thank you. I used it to measure the temperature of my brick forge. Seemed right on! ### 5/5 — Good purchase! *2011-11-13* Calibration takes some practice but overall it works well. A nice effort for something that would cost a lot of money. ## Frequently asked questions about Thermal Light ### What is the temperature range for Thermal Light? Thermal Light can measure temperatures between 1000F and 2700F. The temperature increments are 50F. ### How accurate is Thermal Light? The app has been calibrated against a certified IR thermometer to ensure accuracy in its temperature readings. ### What materials can Thermal Light measure the temperature of? Thermal Light is designed to measure the black body radiation of materials such as iron, steel, and ceramics. ### Is Thermal Light suitable for professional use? Yes, it is great for knowing the temperature of steel for working, offering a more affordable solution than traditional thermometers. ### What devices does Thermal Light support? Thermal Light is supported on iPhone and iPod devices. ### How much does Thermal Light cost? Thermal Light is a paid application, priced at $1.99. ### When was Thermal Light last updated? The latest version of Thermal Light was last updated on January 18, 2021. ### Does Thermal Light have ads? No, Thermal Light does not contain advertisements. ## Version history (last 5 releases) ### 1.220 — 2026-06-02 updated for latest iOS ### 1.211 — 2021-01-18 Low temperature setting algorithm adjusted. ### 1.210 — 2021-01-16 Updated for iOS 14 ### 1.20 — 2014-10-20 This app has been updated by Apple to display the Apple Watch app icon. updated for iOS 8 ### 1.10 — 2012-11-30 Updated for iOS 6 ## Apps similar to Thermal Light | App | Rating | Price | Category | | --- | --- | --- | --- | | [ThermoWorks](https://appshunter.io/ios/app/thermoworks/id1503955408) | 4.8 (16,700) | Free | Utilities | | [Major Tech Thermal-X](https://appshunter.io/ios/app/major-tech-thermal-x/id6476640045) | — | Free | Utilities | | [Universal Wifi Endoscope](https://appshunter.io/ios/app/universal-wifi-endoscope/id6472705711) | 1.0 (1) | $5.99 | Utilities | | [GaugeControl](https://appshunter.io/ios/app/gaugecontrol/id6450934826) | 5.0 (4) | Free | Utilities | | [Unified Care for Providers](https://appshunter.io/ios/app/unified-care-for-providers/id1445698563) | 5.0 (1) | Free | Utilities | | [Hardness Unit Converter](https://appshunter.io/ios/app/hardness-unit-converter/id1409248484) | 4.0 (7) | $1.99 | Utilities | ## More apps by Crystal Clear Solutions - [Insulin Protocol Calculator](https://appshunter.io/ios/app/insulin-protocol-calculator/id444062167) - [Anesthesia 411](https://appshunter.io/ios/app/anesthesia-411/id449473295) - [Intubating Monkey](https://appshunter.io/ios/app/intubating-monkey/id451367656) - [Double Lumen](https://appshunter.io/ios/app/double-lumen/id459376323) - [EMS Drugs Fast](https://appshunter.io/ios/app/ems-drugs-fast/id478589726) All apps by Crystal Clear Solutions: https://appshunter.io/developer/444062170 ## Related topics [thermal master p1](https://appshunter.io/ios/topics/thermal-master-p1) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-08.*