Thermal Light vs Hardness Unit Converter
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Thermal Light
This app measures the temperature of extremely hot objects by analyzing the light they emit. It's designed for users working with materials like iron, steel, and copper, offering a cost-effective alternative to specialized thermometers.
- 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
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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
Hardness Unit Converter
Easily convert hardness values between 12 different units, including Vickers, Brinell, Rockwell, and Shore. Input your value and select the desired unit for instant conversion, referencing ASTM E 140 standards and polynomial approximations for accuracy.
- Converts 12 hardness units
- Vickers, Brinell, Rockwell, Shore support
- Tensile strength conversion
- ASTM E 140 reference
- Polynomial approximation for data
- Simple input and unit selection
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The Hardness Unit Converter application converts the hardness into 12 types of units. The units to be converted by this application are Vickers hardness HV, Brinell hardness HBS, HBW, Rockwell hardness HRA, HRB, HRC, HRD, Rockwell superficial hardness HR 15 N, HR 30 N, HR 45 N, Shore hardness HS, and tensile strength MPa. Simply input the hardness value and select the unit of hardness with the unit selection button, it will be converted into 12 types of units. This application refers to the approximate conversion table of ASTM E 140 Table 1 and JIS, and data not in the table is calculated by polynomial approximation. Values in the range not normally used are indicated by ().
Screenshots
Verdict
The clearest difference is rating: Hardness Unit Converter at 4.0 against Thermal Light's 2.3. Hardness Unit Converter also leads on device support (3 vs 1). Thermal Light's advantage is review sentiment (50% vs 17%) and update cadence (weekly vs every 5 months). On price, ratings volume, ads and in-app purchases 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
Thermal Light costs $1.99 and Hardness Unit Converter $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Hardness Unit Converter holds the better App Store score, 4.0 against 2.3. Both are backed by a comparable volume of ratings — 6 and 7 respectively. Written reviews complicate that: 50% of Thermal Light's written reviews are positive against 17% of Hardness Unit Converter's, so the app with the better star average is not the one people write more warmly about.
Thermal Light ships an update weekly, Hardness Unit Converter every 5 months. The most recent releases landed on October 23, 2026 and October 25, 2026 respectively.
| Parameter | Thermal Light | Hardness Unit Converter |
|---|---|---|
| Price | $1.99 | $1.99 |
| Rating | 2.3 (6 ratings) | 4.0 (7 ratings) — better |
| Positive reviews | 50.0% of reviews — better | 16.7% of reviews |
| Number of ratings | 6 | 7 — better |
| Update frequency | Weekly — better | Every 5 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone | iPhone, iPad, iPod — better |
| Requires iOS | 16.6 | 15.6 — better |
| Further details — not scored | ||
| Size | 2 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Crystal Clear Solutions | Kei Suefuji |
Customer experience
Thermal Light
Hardness Unit Converter
In-app purchases
Thermal Light
No in-app purchases
Hardness Unit Converter
No in-app purchases
Questions
Is Thermal Light free?
Is Hardness Unit Converter free?
Which has better reviews, Thermal Light or Hardness Unit Converter?
Do Thermal Light or Hardness Unit Converter have ads?
Which is updated more often, Thermal Light or Hardness Unit Converter?
Other comparisons
