Lexicon vs Mental Math Interview Trainer

Lexicon is a personal vocabulary gallery for the curious mind. Every word you collect becomes a beautifully crafted card — complete with its definition, etymology, pronunciation, a memory hook to help it stick, and a striking photograph to bring it to life. HOW IT WORKS Search for any word and add it to your collection. Lexicon instantly curates a rich card with everything you need to truly absorb it: where the word came from, how to use it, a mnemonic to remember it by, and a cultural reference that gives it context. Each card is paired with a carefully selected photograph, turning your vocabulary into something worth browsing. SIGHTINGS — YOUR WORDS IN THE WILD Lexicon scans articles, essays, poetry, and quotes across the web to find real appearances of the words you've collected. It's the thrill of recognition — seeing a word you just learned show up in The Guardian, a poem, or a famous quote. A daily Word of the Day, chosen to reflect the cultural moment, keeps your collection growing. ORGANIZE YOUR WAY Create custom collections to group words by theme, project, or mood. Browse your library alphabetically, by domain (Art, Logic, Nature, Society), or by collection. Switch between a visual gallery and a clean index view. BUILT TO REMEMBER Every card includes a mnemonic device — a short, catchy phrase designed to make the word unforgettable. Combined with etymology, example sentences, and pop culture references, Lexicon gives you multiple pathways to retention. DESIGNED WITH CARE Lexicon is built for people who believe words matter. The interface is minimal, typographic, and intentional — inspired by editorial design and the quiet pleasure of a well-curated library. Your words sync across devices with Sign in with Apple. Your collection is yours, wherever you go.

Mental Math helps you build fast, reliable mental calculation skills through short, focused practice sessions. Whether you are preparing for consulting interviews (McKinsey, BCG, Bain), finance or tech case interviews, or any role that tests quantitative reasoning, this app gives you a simple way to drill the exact skills you need: quick multiplication, percentages, division, and growth calculations. Practice in three modes: • Speed: solve as many problems as you can before the clock runs out • Accuracy: answer a fixed set of questions and aim for precision • Custom: pick specific categories and set your own time limit Adjust difficulty from Easy to Hard and fine-tune the tolerance margin so drills match your current level. Your results are saved locally on your device so you can track progress across sessions and spot improvement over time. Features: • Short daily mental math drills designed for interview prep • Speed, Accuracy, and Custom practice modes • Multiplication, percentage, division, and growth exercises • Adjustable difficulty and tolerance controls • Session summaries and long-term performance stats • Lightweight, distraction-free design • Available in English, French, and Spanish Perfect for consulting interview prep, case interview math, finance interviews, product management interviews, or anyone looking to sharpen their everyday arithmetic.