A2L Safe Charge

A2L R-454B & R-32 PT Tool

Free · In-App Purchases · Designed for iPad. Not verified for macOS.

Free field calculator for the A2L transition: NIST-based PT data, superheat/subcooling, UL max charge limits, and pro PDF reports. No account, works offline. The field calculator built for the A2L era. Looking for a Check & Charge replacement? A2L SafeCharge picks up where legacy apps left off — with full R-454B and R-32 support, no corporate account, and no sign-in. WHAT IT DOES • Superheat and subcooling calculator for R-454B, R-32, and R-410A • PT data sourced from NIST REFPROP — the same data OEMs use, with the source cited on every result • Automatically uses dew point for superheat and bubble point for subcooling on R-454B — the most common A2L charging error, handled for you • Enter your OEM nameplate target and see how your reading compares • Max allowable charge calculator — enter room dimensions and unit location, get a passive charge limit based on A2L safety guidelines • Save job history and export a professional one-page PDF field report with your company branding • A2L quick reference — refrigerant comparison, bubble/dew point explainer, and A2L safety rules — all offline BUILT FOR THE FIELD No account. No internet required. Your job data stays on your phone. Opens fast, returns a clear answer, gets you back to work. 100% FREE Every feature is included — calculators, history, PDF reports. A small ad keeps it free. No subscriptions, no paywalls, no upsells.

Ratings & Reviews

  • This app has not received enough ratings or reviews to display an overview.

- Safe Charge Reports now fit cleanly on a single page - PDF reports show the correct app version and include a link to share the app - Enter negative line temperatures for low-ambient work - Smarter field entry: clearer error messages and "next" jumps straight to the following field

Version 1.2.0

The developer, Mike Watson, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Used to Track You

    The following data may be used to track you across apps and websites owned by other companies:

    • Location
    • Identifiers
    • Usage Data

  • Data Linked to You

    The following data may be collected and linked to your identity:

    • Location
    • Identifiers
    • Usage Data

  • Data Not Linked to You

    The following data may be collected but it is not linked to your identity:

    • Diagnostics

Privacy practices may vary based, for example, on the features you use or your age. Learn More

The developer indicated that this app supports the following accessibility features. Learn More

  • Supported Features

    • VoiceOver

    • Voice Control

    • Dark Interface

    • Differentiate Without Colour Alone

    • Sufficient Contrast

    • Reduced Motion

Information

Provider
  • Mike Watson
Size
  • 44.5 MB
Category
  • Business
Compatibility
Requires iOS 15.1 or later.
  • iPhone
    Requires iOS 15.1 or later.
  • iPad
    Requires iPadOS 15.1 or later.
  • iPod touch
    Requires iOS 15.1 or later.
  • Mac
    Requires macOS 12.0 or later and a Mac with Apple M1 chip or later.
  • Apple Vision
    Requires visionOS 1.0 or later.
Languages
  • English
Age Rating
4+
In-App Purchases
Yes
Copyright
  • © 2026 Mike Watson
  • Developer Website
  • Privacy Policy

    • More by Mike Watson

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