OrbitCalc vs RISC
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
OrbitCalc
This tool helps space enthusiasts, engineers, and researchers precisely calculate satellite orbits. It allows users to determine orbital parameters from vector data or vice versa with accurate results. Save and manage your calculations, and customize measurement units for a personalized experience.
- Orbital calculations from parameters or vectors
- Save and revisit previous calculations
- History page for managing saved work
- Customizable measurement units
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OrbitCalc – Satellite Orbit Calculator OrbitCalc is a powerful and intuitive tool designed for space enthusiasts, engineers, and researchers to calculate satellite orbits with precision. Whether you need to determine orbital parameters from vectors or vice versa, OrbitCalc provides accurate results in just a few taps. Key Features: • Orbital Calculations – Compute satellite orbits based on orbital parameters or vector data effortlessly. • Save Your Calculations – Keep track of your work and revisit previous calculations anytime. • History Page – View and manage all your saved calculations in one place. • Customizable Measurement Units – Adjust unit preferences to suit your needs. Whether you're a student, researcher, or space professional, OrbitCalc is your go-to app for orbital mechanics calculations. Download OrbitCalc today and explore the universe with precision!
RISC
Simulate a complete 32-bit mobile system, including CPU units and memory. Write and debug assembly code directly on the simulated hardware to understand its inner workings.
- 32-bit system simulation
- CPU unit simulation
- Memory subsystem simulation
- Native assembly coding
- Built-in debugger
- Hardware analysis
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RISC-V Assembly Simulator is a mobile 32-bit system simulator. The app simulates the entire system, all the way from each individual unit on a CPU to the memory subsystem. Write assembly natively to the CPU, with a built-in debugger so you can analyze your code and see what the hardware is doing. This app is designed to allow you to learn how to write assembly from your mobile device, simulating a real CPU at your devices maximum speed. Visualize how the hardware works if you want to, see all the registers, see your entire memory subsystem for each cycle. Learn the components of this individual CPU. This app currently supports the base Int for RV32 along with the M extension, allowing multiplication and division. Dual core systems are supported with the atomic instructions. This app features a built in assembler to allow you to learn to write code along with descriptive errors. Code along with Apple Intelligence, giving you advice and helping you fix bugs along the way (experimental). Natively integrated with your devices file system, allowing seamless transfer between devices and potentially other sources.
Screenshots
Verdict
The clearest difference is in-app purchases: RISC at none against OrbitCalc's 1. OrbitCalc's advantage is iOS requirement (18.0 vs 26.0). On price, rating, ratings volume and ads there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. OrbitCalc sells 1 one-off in-app purchase. RISC asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 5.0 for OrbitCalc against 5.0 for RISC. Both are backed by a comparable volume of ratings — 1 and 1 respectively.
| Parameter | OrbitCalc | RISC |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) | 5.0 (1 ratings) |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | 1 | 1 |
| Update frequency | — | Every 2 weeks |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free | Free |
| Devices | iPhone | iPhone, iPad — better |
| Requires iOS | 18.0 — better | 26.0 |
| Further details — not scored | ||
| Size | 11 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | Bian Dhoan Kwik | Matthew Jacobs |
Customer experience
OrbitCalc
RISC
In-app purchases
OrbitCalc
- OrbitCalc Pro$0.99
RISC
No in-app purchases









