A collection of minimalist space and physics calculators for the Flipper Zero. No games, no gimmicks - just the essential calculations for when you need them most.
Interplanetary trajectory calculator for planning transfers between planets. Calculates:
- Hohmann transfer orbits
- Delta-v requirements
- Launch windows
- Phase angles
For when you need to know if that Mars window is actually worth taking.
Time dilation calculator with two modes:
- Special Relativity: Time dilation at relativistic velocities
- General Relativity: Time dilation in gravitational fields
Because sometimes you need to know exactly how much younger you'll be.
These calculators follow strict minimalist principles:
- Boot directly to functionality - no splash screens
- Response time <50ms for all interactions
- Numbers only - no unnecessary explanations
- Default system font - no fancy typography
- Metric units - this is space
Each application can be built independently from the Flipper firmware root:
# Space Travel Calculator
./fbt fap_space_travel_calculator
# Dilate
./fbt fap_dilateCopy the .fap files to your Flipper Zero's SD card under /apps/Tools/
flipper-space-calculators/
├── README.md # This file
├── space-travel-calculator/ # Orbital transfer calculator
│ ├── README.md
│ ├── CLAUDE.md # Development guide
│ └── [source files]
└── dilate/ # Time dilation calculator
├── README.md
├── CLAUDE.md # Development guide
└── [source files]
These tools are designed to do one thing perfectly. If you're thinking of adding features, ask yourself:
- Is it essential to the core calculation?
- Does it maintain <50ms response time?
- Does it follow the minimalist aesthetic?
If any answer is no, it doesn't belong here.
These calculators are tools, not toys. Use them wisely.
"The universe is under no obligation to make sense to you. But your calculator is."