Scan2Sides vs CalcStak

An intuitive and powerful application designed to simplify your document scanning and management needs. You can easily obtain the desired images by taking photos directly within the app or selecting existing ones from the album. IntelliScan supports various document types (such as ID cards, bank cards, passports, etc.), ensuring accurate and efficient scanning. Core Features: - Flexible Image Acquisition: Take photos directly within the app or quickly select images from the album. - Copy both sides: Photocopy both the front and back sides of documents such as ID cards onto a single A4 sheet. - Diverse Export Options: Save scanning results to the album or export them as PDF files for easy sharing and storage. - Intelligent Processing: Automatically detect document borders, correct perspectives, and optimize image quality for a professional effect. - Personalized Settings: Supports adding watermarks, adjusting colors, and provides A4 or custom layout options. Make document scanning and management more convenient and efficient, becoming your indispensable intelligent assistant!

A reverse-Polish-notation calculator built for the keyboard-first crowd: enter, op, done. No equals key, no parentheses, no nested expressions to babysit. WHY RPN If you've used an HP-12C, a Forth REPL, or any stack-based calculator, you already know: RPN is faster once your fingers know the moves. This app puts that experience on your phone without the skeuomorphic clutter. FEATURES • Stack display - see four levels at a glance, scroll deeper. • Full keyboard - numeric pad, operators, and stack manipulation (swap, drop, roll, LASTX). • Configurable angle mode (degrees / radians), stack mode (unlimited or HP-classic four-deep), and ENTER behavior. • Storage registers (STO/RCL 0–9) for holding values across calculations. • History - every operation, scrollable; tap a row to push that past result onto the stack. Capped at the most recent 150 entries. • Optional Scientific pack (one-time in-app purchase): trig + inverses, log/ln, 10^x/e^x, powers, roots, π and e. • Dark mode and a calm, monospace-forward design. • Offline-only. No tracking, no analytics, no network calls. Your math stays on your phone. NOT INCLUDED (BY DESIGN) • No "infix mode." This is RPN. If that's not what you wanted, this isn't your app. • No cloud sync. Yet. • No ads, ever. PRIVACY CalcStak collects nothing. The app does not make network requests. Settings and history are stored on-device.