Derivative Master by ChatStick vs Swiftlet

Derivative Master is the all-in-one calculus companion for high school and college students learning differentiation. From your first power rule to chain rule mastery, every derivative is solved step by step — with the exact rule highlighted at each move. Whether you're prepping for AP Calculus, Calc 1, or a final exam, Derivative Master replaces hours of confusion with clear, color-coded explanations, hands-on practice, and gamified progress tracking. WHY STUDENTS LOVE DERIVATIVE MASTER • Step-by-step symbolic solver — type any function and see every derivation step with the rule applied • 11 differentiation rules library — Power, Chain, Product, Quotient, Sum, Constant, Trig, Exponential, Logarithm, and more, each with worked examples and common mistakes • Daily Challenge — a new problem every day to build a streak • Practice mode — Easy, Medium, and Hard problems with hints, instant feedback, and rule identification • Concept articles — short, focused lessons on limits, tangent lines, optimization, notation, and the meaning of a derivative • Achievements & streaks — 12 badges to earn as you level up • Smart calculator — full math keypad with sin, cos, tan, ln, e^x, π, and powers • Save and revisit — keep history of solved problems for quick review PREMIUM FEATURES Unlock the full experience: • Interactive Graph Plotter — see f(x) and f'(x) side by side on the same axes • Full Quiz Mode — timed multiple-choice exams with explanations • Unlimited Favorites — star derivatives for instant recall • Unlimited History — never lose a worked problem • Ad-free experience DESIGNED FOR LEARNING Derivative Master isn't just a calculator — it's a tutor. Each step explains WHICH rule was applied and WHY, so you build real understanding instead of memorizing answers. The color-coded interface, clean math typography, and gentle gamification make studying calculus genuinely enjoyable. PERFECT FOR • AP Calculus AB & BC students • College Calculus 1 students • Engineering, physics, and economics majors brushing up on derivatives • High school students starting differential calculus • Anyone who wants to truly understand derivatives, not just compute them WHAT'S INSIDE — Step-by-step derivative solver with symbolic engine — 11-rule reference library with formulas and examples — Daily Challenge problem (changes every day) — Tiered practice problems (Easy / Medium / Hard) — 6 concept articles on calculus fundamentals — Interactive function & derivative graph plotter — Full quiz mode with scoring and explanations — 12 achievements & streak tracking — Custom calculator with trig, log, exponential, and constants — History and favorites for quick review Download Derivative Master today and turn calculus from confusing into conquered.

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.