PT100 Calculator vs LTH Discover
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
PT100 Calculator
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PT100 Calculator is a fast, reliable tool for converting temperature and resistance values for PT100 and PT1000 RTD sensors. Built for electricians, engineers, and technicians, it makes on-site checks quick and effortless. Whether you’re fault finding, testing sensors, or verifying readings, PT100 Calculator gives you instant, accurate results without needing internet access. == Features == + Convert Temperature to Resistance (Ω) + Convert Resistance (Ω) to Temperature + Supports PT100 and PT1000 + Works in Celsius and Fahrenheit + Clean, fast interface designed for real-world use + Fully offline, no connection required + Built-in lookup table for quick reference + Copy results instantly == Designed for the job == No clutter. No accounts. No distractions. Just open the app, enter your value, and get the answer immediately. Perfect for: + Electricians + HVAC engineers + Industrial maintenance + Panel builders + Apprentices and trainees == Accurate and reliable == Uses standard RTD characteristics based on IEC specifications to ensure consistent and dependable results. PT100 Calculator is the simplest way to convert RTD readings on-site.
LTH Discover
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LTH Discover from LTH Electronics provides an easy and intuitive means of wirelessly connecting, via Bluetooth, to LTH Electronics’ range of liquid process control instrumentation. Features include: Live Discovery Screen – Allows for a quick overview of any nearby instruments, showing their current readings and status. Measurement Screen – Shows live measurement readings of the process parameter along with instrument output values and status. Configuration Menus – Easily set up the instrument’s measurement and control parameters. Features a secure password system that allows for viewing while not allowing alterations unless the instrument’s unique password is known. Calibration – Intuitive system that guides the user through each step of their sensor’s calibration procedure. Errors – Detailed error system with inbuilt guides to help the user solve instrument problems. Save and Restore – Experience faster commissioning times with our advanced save and restore system, designed to effortlessly duplicate instrument setups. Firmware Upgrade – Upgrade connected instruments' firmware for performance and feature enhancements. List of supported devices • DCU18 • DEU18 • DMU18 • DOU18 • DPU18 • DTU18
Screenshots
Verdict
The clearest difference is price: LTH Discover at Free against PT100 Calculator's $2.99. LTH Discover also leads on iOS requirement (15.6 vs 17.0). PT100 Calculator's advantage is update cadence (monthly vs every 5 months). On ads, 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
LTH Discover is free to download; PT100 Calculator costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.
PT100 Calculator ships an update monthly, LTH Discover every 5 months. The most recent releases landed on September 18, 2026 and October 25, 2026 respectively.
| Parameter | PT100 Calculator | LTH Discover |
|---|---|---|
| Price | $2.99 | Free — better |
| Update frequency | Monthly — better | Every 5 months |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17.0 | 15.6 — better |
| Further details — not scored | ||
| Size | 3 MB | 40 MB |
| Age rating | 4+ | 4+ |
| Developer | William Newcombe | L.T.H. Electronics Limited |
In-app purchases
PT100 Calculator
No in-app purchases
LTH Discover
No in-app purchases
Questions
Is PT100 Calculator free?
Is LTH Discover free?
Do PT100 Calculator or LTH Discover have ads?
Which is updated more often, PT100 Calculator or LTH Discover?
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