# Thermodynamic Cycles — Thermodynamic Cycle Solver

> Thermodynamic Cycle Solver (iPhone/iPad app by Angus Malcolm.)

- Source: https://appshunter.io/ios/app/thermodynamic-cycles/id834153226 (this page in markdown: same URL + `.md`)
- Developer: [Angus Malcolm](https://appshunter.io/developer/834153229)
- Category: Education, Productivity
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 15.0 · 50 MB
- Languages: American English
- Released: 2014-03-16
- Data updated: 2026-08-17
- User reviews in markdown: https://appshunter.io/ios/app/thermodynamic-cycles/id834153226/reviews.md

## What is Thermodynamic Cycles?

Thermo Cycles is a powerful thermodynamic cycle calculator designed for engineering students and professionals. Solve 12 thermodynamic cycles quickly and accurately — just enter the values you know, and the iterative constraint solver computes the rest.

Supported cycles:
- Carnot Cycle
- Otto Cycle
- Diesel Cycle
- Brayton Cycle
- Regenerative Brayton Cycle
- Rankine Cycle
- Reheated Rankine Cycle
- Open Feedwater Heater Cycle
- Closed Feedwater Heater Cycle
- Flash Chamber Cycle
- Heat Pump / Refrigeration Cycle
- Cascading Refrigeration Cycle

Features:
- Built-in fluid property tables for steam, R-134a, and more
- Iterative constraint solver — enter what you know, get the full solution
- State point properties automatically resolved from fluid tables
- Clean, intuitive interface optimized for studying and problem sets
- Available in 21 languages

Get started free with the Carnot, Otto, and Rankine cycles included. Unlock additional cycle packs via in-app purchase.

Whether you are studying for exams or solving homework problems, Thermo Cycles makes thermodynamic analysis fast and straightforward.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Gas Power Cycles | $0.49 | one-time |
| Refrigeration Cycles | $0.49 | one-time |
| Unlock All | $0.99 | one-time |
| Vapor Power Cycles | $0.49 | one-time |



## Version history (last 5 releases)

### 2.1.0 — 2026-08-16

New: variable specific heats! Otto, Diesel and Brayton cycles can now be solved with air-table properties (u, h, Pr, vr) that match textbook solutions. Plus updated Play billing components.

### 2.0.4 — 2026-08-09

Improved calculation reliability when default inputs (efficiencies, gas properties) are left blank.

### 2.0.3 — 2026-05-06

Fixed: in-app purchases now restore automatically when you install Thermo Cycles on a second device with the same store account. No more "you already own this item".

### 2.0.1 — 2026-02-25

• Fixed flash chamber cycle diagram for all languages
• Corrected process descriptions and assumptions
• Added framework for upcoming Mac support
• Bug fixes and performance improvements

### 2.0 — 2026-02-24

Added Carnot cycle, and Otto , Rankine and Carnot cycles are free to use. The rest of the cycles are behind a paywall.  We have significantly improved UX, added a free property calculator that searches entropy and enthalpy tables of various fluids, added calculation steps that walks you through how to solve the cycle,  and added support for 22 languages

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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 2026-08-17.*