PT Chart: Superheat Calculator

PT Chart: Superheat Calculator is a pressure-temperature chart with superheat and subcooling calculators for refrigeration and air-conditioning technicians. No account, and the chart and calculators work offline. The free version offers optional rewarded ads to unlock extra tools for a while; Pro is a one-time purchase that unlocks everything for good.

Coming soon to Google Play Help & support

Features

A simple pressure-temperature chart and superheat calculator for HVAC and refrigeration technicians.

Pressure-temperature chart

Look up pressure and temperature both ways, with dew, bubble and glide for blends, in the units you choose.

Superheat and subcooling

Superheat and subcooling calculators next to the chart, in one app.

Units and altitude

psig, bar, kPa and MPa, °F and °C, and an altitude setting that stays where you put it.

No account, works offline

No sign-in. The core chart and calculators need no signal, and nothing plays automatically: no banners and no pop-up ads.

Safety badges and accuracy

Refrigerant safety classes are shown, and an Accuracy screen shows how the values were checked.

Job log and reports (Pro)

Save readings with notes and share them as a PDF or CSV report.

Pricing

Free, with an optional one-time Pro purchase.

Pro is a single in-app purchase through Google Play. There is no subscription. The free version has an optional button to watch a rewarded ad (Unity LevelPlay) that unlocks targets, the job log and reports for 24 hours, a limited number of times. Pro unlocks everything permanently, with no time windows and no ad to watch.

Free

Pressure-temperature chart
Superheat and subcooling calculators
All units and altitude
No account
Optional: watch an ad to unlock targets, the job log and reports for 24 hours (limited unlocks per day)

Pro

One-time purchase

Everything unlocked permanently: no time windows, no ad to watch
Job log with notes
PDF and CSV reports
Target superheat and subcooling checks
Home-screen widget
One-time purchase, no subscription

Privacy

Your saved jobs stay on your phone.

No account. Your settings, readings and saved jobs stay on your phone and we never receive them. Usage statistics and crash reports go to Google Firebase (in the EEA, UK and Switzerland only with your consent; everyone can switch them off in Settings). Ads are optional rewarded ads only (you tap to watch one) through Unity LevelPlay and its ad partners, which use your advertising ID; in the EU/EEA, UK and Switzerland the app does not currently show ads. The optional Pro purchase is handled by Google Play.

Read the privacy policy

Developer: VELOX APP LTD
Requires: Android 8.0 or later
Languages: English, Spanish
Package name: com.veloxapp.ptchart