PDF Splitter + PDF Merge vs Calculator X

PDF Merge & PDF Splitter + is a very easy-to-use app that allows you to quickly merge specified pages of multiple PDFs into one pdf. You can also use it to extract pages from pdf.   Key Features: ● Extract page(s) of PDF. ● Merge specified pages of multiple PDFs into one PDF. ● Merge password-protected PDF, but you must know the password. ● The name is also PDF Merge & PDF Splitter + on the MacOS platform, more powerful and easier to use. ● Contact us If you have any questions, please feel free to contact us by email. Email address : tzq17888@163.com.

Calculator X is a powerful calculator built for developers, students, and anyone who works with numbers beyond the basics. PROGRAMMER'S CALCULATOR Work seamlessly across decimal, binary, hexadecimal, and octal. Toggle individual bits directly on a 64-bit grid, perform bitwise operations (AND, OR, XOR, NOT), and watch all four bases update in real time as you type. 2D FUNCTION GRAPHING Plot any mathematical function of x instantly. Pan and pinch-to-zoom to explore the curve at any scale. Perfect for visualizing equations, finding intersections, and understanding function behavior. 3D SURFACE PLOTTING Enter any function of x and y and see it rendered as a live 3D surface. Rotate with one finger, zoom with a pinch, and pan with two fingers. Gradient coloring makes it easy to read the shape of any surface. MATRIX CALCULATOR Work with matrices up to 8×8. Perform addition, subtraction, multiplication, transpose, determinant, and inverse — all in one place. Results scroll so nothing gets cut off no matter how large your matrix is. ALL FEATURES FREE Every tool is available to every user, no subscription required.