AlgoLens vs Swiftlet

AlgoLens teaches coding patterns the way they actually click — through real-world stories, interactive visualizers, and guided practice. Instead of memorizing abstract algorithms, see why and where each pattern is used in real software systems: • Fraud detection → Sliding Window • Duplicate payments → HashMap • Undo / Redo → Stack • Recently Played → Arrays • Friends of friends → Graph BFS • Calendar conflicts → Merge Intervals Eight pattern paths so far: • Arrays • HashMaps • Two Pointers • Sliding Window • Stack & Queue • Trees • Graph Basics • Merge Intervals Each lesson includes: • A real-world story that anchors the pattern in memory • An interactive visualizer — step through, play, watch the work happen • Guided practice problems with explanations • An interview-ready breakdown with time/space complexity, vs. brute force, and a Swift code sample in a syntax-highlighted editor Practice mode adds three coding game types: • Fill in the blanks — tap a token, drop it into the right slot • Sort the code — shuffled lines, tap two to swap them into order • Find the bug — read the function, tap the line that doesn't match the title Stack streaks, earn XP, and filter puzzles by the companies that ask similar questions in interviews — Google, Meta, Apple, Amazon, Microsoft. Built for mobile-first learning. iPhone-sized, dark code editor styling, short focused lessons designed for the in-between moments. Understand patterns visually. Remember them through stories. Apply them like real engineers.

Swiftlet is an independent app and is not affiliated with or endorsed by Apple Inc. Swiftlet turns your device into a place to actually learn to code — not just watch videos, but write real Swift and see it run instantly. A real Swift engine runs right on your device, so every lesson is hands-on and works completely offline. Type code, run it, and watch what happens — no account, no setup, no Mac required. LEARN • Interactive lessons covering Swift from the ground up: variables, booleans, branching, loops, arrays, dictionaries, functions, closures, enums, structs, classes, protocols, generics, error handling, async/await, and more. • Each lesson explains the idea, then asks you to write the code — and checks your work as you go. • A clear learning path takes you from your first line of code to real language features, one concept at a time. BUILD PROJECTS • Guided projects let you assemble what you've learned into small, real apps. • Follow step-by-step stages and finish with something that actually works. PRACTICE • Hands-on challenges reinforce each concept so it sticks. • Try it, get feedback, and move on when you've got it. TRACK YOUR PROGRESS • Your progress is saved on device as you complete lessons, projects, and challenges. • Pick up exactly where you left off. WHY SWIFTLET • 100% on-device: the code you write runs locally — private and fast. • Fully offline: learn on the train, on a plane, anywhere. • Mobile-first: designed for the phone in your pocket, not a shrunk-down desktop tool. • No account, no tracking, no ads. Whether you're writing your very first line of Swift or brushing up on closures and async/await, Swiftlet gives you a real coding environment that fits in your pocket. Start coding today.