# Saturon: A2L PT Chart — R-454B & R-32 charge calc

> R-454B & R-32 charge calc (iPhone/iPad app by Karolis Valatka.)

- Source: https://appshunter.io/ios/app/saturon-a2l-pt-chart/id6781320978 (this page in markdown: same URL + `.md`)
- Developer: [Karolis Valatka](https://appshunter.io/developer/1850435087)
- Category: Utilities, Productivity
- Price: $7.99
- Age rating: 4+
- Requires: iOS 17.0 · 1 MB
- Languages: American English
- Released: 2026-06-23
- Data updated: 2026-07-07
- User reviews in markdown: https://appshunter.io/ios/app/saturon-a2l-pt-chart/id6781320978/reviews.md

## What is Saturon?

The offline HVAC charging toolkit built for the A2L era. Right number at the unit — R-410A through the new low-GWP refrigerants R-454B, R-32 and R-454C — and never a subscription.

NO SUBSCRIPTION. Pay once, yours forever. No ads, no account, no Bluetooth, no signal needed.

EVERY REFRIGERANT, INCLUDING A2L
• PT charts for R-410A, R-22, R-454B, R-32, R-454C, R-404A, R-134a, R-407C, R-290
• Bubble AND dew columns — so glide is correct on R-454C, R-407C and every blend
• Superheat reads off dew, subcooling off bubble — the way the physics actually works

CHARGE IT RIGHT
• Measured superheat and subcooling, glide-routed per refrigerant
• Target superheat for fixed-orifice systems
• Airflow / CFM (1.08 × CFM × ΔT) with the 400 CFM/ton check

WORKS IN YOUR UNITS
• °F / psig or °C / bar — one tap, remembered

BUILT FOR THE FIELD
• Big numbers readable at arm's length, gloves on
• Live results — no "calculate" button
• 100% offline, in any basement or parking lot

EVERY NUMBER SOURCED
Refrigerant data from NIST REFPROP-lineage equations of state (CoolProp), cross-checked against ASHRAE 34 and manufacturer charts — version-stamped and cited in the app. A reference aid: always confirm against the equipment's charging chart and nameplate.

For service techs, installers and apprentices working the R-410A → A2L transition.

## Chart rankings

- #194 in Top Paid · Utilities (US App Store)


## Version history (last 1 release)

### 1.0 — 2026-06-23

No release notes.

## More apps by Karolis Valatka

- [PipeSnap: Pipe Fitter Calc](https://appshunter.io/ios/app/pipesnap-pipe-fitter-calc/id6778792345)
- [PourMath](https://appshunter.io/ios/app/pourmath/id6780965002)

All apps by Karolis Valatka: https://appshunter.io/developer/1850435087

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-07.*