Calcula Keyboard vs PDF Toolbox

Calcula is a lightweight scientific math keyboard for iPhone. After you add the keyboard, you can type expressions in chats, notes, browser search bars, or any system text field, and insert the result at the current cursor position. Version 1.0 focuses on the core workflow: a basic keyboard, an f(x) scientific panel, DEG / RAD trigonometric input, in-keyboard history, and a companion app for setup guidance, basic settings, and About. It does not include accounts, cloud sync, or online computation. Settings stay on the device.

[All-in-One, 100% Free, No Ads, and Secure Local PDF Toolkit] PDF Toolbox is a powerful and versatile document utility designed for ultimate productivity. We strictly promise: All core features in the current version are 100% free with absolutely NO annoying ads. Featuring a login-free/no-account ecosystem. Your privacy is our top priority. Key Features: Advanced PDF Page Management: Seamlessly split, merge, and reorder PDF pages. Rotate or delete unwanted pages to reorganize your documents with a single tap. Smart PDF Compression: Reduce PDF file size significantly while maintaining crystal-clear quality. Preview estimated savings in real-time for easier sharing and storage. High-Fidelity Converter: Convert PDF to Images effortlessly, or turn multiple photos from your gallery into a single high-quality PDF document in batches. Powerful OCR Text Extraction: Extract text blocks and images from your PDFs or pictures using advanced OCR technology. Copy results to your clipboard instantly for easy editing. Watermark & Document Security: Personalize your PDFs by adding text watermarks with full control over opacity, font size, and rotation angle. Add customized page numbers for professional use. Local History & Viewer: Manage your files securely with an on-device history log. Open and share your documents directly. Clean temporary caches anytime to save phone storage. No registration required—install and boost your productivity instantly with PDF Toolbox!