Algorithms
Interview patterns
- Sliding window
- Graphs and traversal
- Dynamic programming
Open source · Native macOS · Offline-first
Make code patterns
familiar.
AI writes code. You should still understand it.
TypingPall is a focused practice app for algorithms, design patterns, language idioms, and concurrency—one line at a time.
Runs on macOS 12+ · GPL-3.0 · No account, analytics, or third-party runtime dependencies
Why practice in the age of AI?
Fast trains exist, but runners still use treadmills.
AI generates code, but engineers still need the muscle memory of how a binary search narrows, why a mutex guards shared state, and where an off-by-one hides.
Understanding is a skill that atrophies without practice. TypingPall is the treadmill.
01Small, repeatable
practice loops
practice loops
02Your code stays
on your Mac
on your Mac
03Learn details,
not just answers
not just answers
See the practice loop
Less passive review.
More recall.
Choose a pattern, keep the full reference in view, reproduce one line, and repeat the parts that deserve another pass.
A deliberately calm loop
Practice the shape
of a solution.
-
01
Choose a pattern
Start with a built-in lesson, paste a snippet, or import a UTF-8 source file.
-
02
Type one line
The reference stays visible. Leading indentation is handled, and the first mismatch is easy to spot.
-
03
Recall and repeat
Hide the code when you are ready, get a small hint, and repeat the line or the whole pattern without a timer.
Practice material included
Patterns worth
remembering.
Design
Building blocks
- Factory and strategy
- LRU cache
- Token-bucket rate limiter
Languages
Idioms and concurrency
- Python, C++, Rust, and Go
- Ownership and errors
- Channels, tasks, and mutexes
A useful first contribution
Help make practice
more memorable.
TypingPall is intentionally small, native, and uncomplicated. We welcome focused improvements that make its practice loop clearer, more accessible, or more useful.
Read the contribution guideBuild it. Practice with it. Improve it.