# RefrigCharge

> R-454B · Subcool · Superheat

Canonical page: [https://chrome-stats.com/d/id6761541500](https://chrome-stats.com/d/id6761541500)

## Overview

- **ID:** `id6761541500`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** Shanghai Sheyuan Network Technology Co., Ltd.
- **Category:** Utilities
- **Version:** 1.0.3
- **Last updated:** 2026-07-01
- **First published:** 2026-04-04
- **Size:** 1011 KB
- **Data as of:** 2026-09-18
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/refrigcharge/id6761541500)
- **Website:** [https://calcspec.com/app-privacy.html](https://calcspec.com/app-privacy.html)
- **Privacy policy:** [https://calcspec.com/app-privacy.html](https://calcspec.com/app-privacy.html)

## Description

R-410A subcool 7°F vs target 10°F - undercharged or low airflow? Diagnoses subcool, superheat, and charge advice for 5 refrigerants. $4.99 one-time, no login.

Built for HVAC service techs and install crews who need subcool / superheat diagnosis on the roof - not a dashboard you log into.

WHAT IT DOES
Computes measured subcooling and superheat from your gauge readings, compares them against per-refrigerant target windows, and tells you whether the system is undercharged, overcharged, or showing airflow issues. Charge adjustment advice differs for TXV vs. piston / cap-tube metering, matching the field workflow.

REFRIGERANTS SUPPORTED
- R-410A
- R-22
- R-134a
- R-404A
- R-407C

INPUTS
- Refrigerant type (picker)
- Metering device (TXV or Piston / Cap Tube)
- Liquid line temperature
- Condensing saturation temperature
- Suction line temperature
- Evaporating saturation temperature
- °F or °C toggle

RETURNS
- Measured subcooling vs. target (color-coded: green within ±3°F, red outside)
- Measured superheat vs. target (color-coded)
- Diagnosis: undercharged, overcharged, normal, or airflow issue
- Charge adjustment advice: ADD, REMOVE, or CORRECT
- Adjustment basis: subcool for TXV, superheat for piston

WHY THIS APP, NOT THE FREE ONES
- Math is shown - measured minus target, with the per-refrigerant windows visible.
- Status at a glance - color-coded so you do not have to do mental arithmetic on the ladder.
- Works offline - RF-shielded basements, attics, and roofs. Always available.
- No login. No ads. No telemetry. No subscription.

PRICING
$4.99. Pay once, own it. Lifetime access on iPhone, iPad, and Mac via Family Sharing.

NOT A SUBSTITUTE FOR
The manufacturer's charging procedure for your specific equipment. The equipment data plate's nameplate charge. Calibrated gauge sets. This app gives you a directional read - verify against the OEM service manual before adjusting.

## Rankings

- #1,661,066 — Overall

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Source: [Chrome-Stats](https://chrome-stats.com/d/id6761541500)