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EqCalc-G
Gas Chemical Equilibrium
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
EqCalc‑G is an educational and engineering reference tool for calculating gaseous chemical equilibrium using Gibbs free‑energy minimization. Designed for students, researchers, and practicing engineers, the app provides a fast, portable way to explore equilibrium behavior in hydrogen and hydrocarbon systems under ideal‑gas assumptions.
Key Features:
• Includes a publicly available thermochemical dataset derived from NASA curve‑fits of the NIST‑JANAF tables for selected species
• Import your own thermochemical datasets in Aerotherm, Chemkin, or NASA CEA formats
• Flexible reactant specification:
- Define mixtures on a mole or mass basis
- Or specify fuel mixture, air, and fuel‑air equivalence ratio
• Export results easily by copying output to the clipboard for use in your favorite notes or spreadsheet apps
Basic vs. Plus Version:
The free Basic version supports fixed enthalpy and pressure equilibrium calculations.
Upgrade to Plus version to unlock additional problem types:
• Fixed temperature & pressure
• Fixed entropy & pressure
• Fixed internal energy & volume
• Fixed temperature & volume
• Fixed entropy & volume
NASA/NIST Notice:
Use of NASA and NIST thermochemical data does not imply endorsement, certification, recommendation, or approval of this app, its developer, or any results produced. NASA and NIST provide no warranties and assume no liability for the use of their data within this app.
Privacy Policy: https://jtonouchi.github.io/EqCalc-G/privacy
Terms and Conditions: https://jtonouchi.github.io/EqCalc-G/terms
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
- Specify different temperatures for reactants, fuel and air
- Bug fixes
The developer, Jon Tonouchi, 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 Not Linked to You
The following data may be collected but it is not linked to your identity:
- Purchases
The developer indicated that this app supports the following accessibility features. Learn More
Information
- Seller
- JT Simulation LLC
- Size
- 11.8 MB
- Category
- Education
- Compatibility
Requires iOS 18.2 or later.
- iPhone
Requires iOS 18.2 or later. - iPad
Requires iPadOS 18.2 or later. - Mac
Requires macOS 15.2 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 2.2 or later.
- iPhone
- Languages
- English
- Age Rating
16+
- 16+
- In-App Purchases
Yes
- Plus Version $2.99
- Copyright
- © 2026 Jon Tonouchi