Coder Calculator

Coder Calculator is a programmer calculator and developer toolkit built for engineers, IT pros, security researchers, and CS students. It replaces five or six scattered single-purpose apps with one focused tool that does the math you actually need at work — base conversions, bitwise operations, hashing, encoding, and AES — all of it running 100% on your device.

No accounts. No cloud sync. No data upload. Every calculation, every byte you hash, every string you encrypt stays on the phone.

⚙️ STANDARD & SCIENTIFIC CALCULATOR
• Full arithmetic expressions with parentheses and operator precedence
• Trigonometry (sin, cos, tan and their inverses) with degree/radian toggle
• Logarithms (ln, log10, log2), powers, roots, factorial, modulo
• BigDecimal under the hood — no floating-point surprises on long decimals

🔢 PROGRAMMER MODE
• Convert between any base from 2 to 36
• Simultaneous HEX / DEC / OCT / BIN view, all synced live
• 64-bit binary grid grouped in nibbles for easy reading
• Bitwise operators: AND, OR, XOR, NOT, shift left/right, rotate left/right
• Bit widths: BYTE (8), WORD (16), DWORD (32), QWORD (64)
• Signed / unsigned interpretation, two's complement, ones' complement

🔐 HASH GENERATOR
• MD5, SHA-1, SHA-256, SHA-512, CRC32 — computed live as you type
• Powered by java.security.MessageDigest (the same crypto libraries banks use)
• Results match openssl and any standard hashing tool byte-for-byte

🛡️ AES ENCRYPTION
• AES-128 with CBC mode and PKCS5 padding (more modes coming)
• Key and IV input with sensible normalization
• Encrypt and decrypt in one tap — no shell scripts needed

📝 ENCODING TOOLS
• Base64 encode / decode (standard and URL-safe)
• URL percent-encode / decode (encodeURIComponent rules)
• Hex string ↔ text (UTF-8)
• Unicode escape ↔ text

🎨 BUILT FOR DEVELOPERS
• Material Design 3 with dynamic color
• Light, dark, and system-default themes — flip them in Settings
• Monospaced typography that lines up your hex digits
• Long-press any result to copy it to the clipboard

🔒 PRIVACY FIRST
• All computation happens locally — no network calls for crypto or hashing
• No analytics on what you type or compute
• One-tap "clear history" in Settings
• Optional rewarded ads to support development — entirely opt-in

The app is free, supported by occasional ads outside the main workflow. Calculator and tool screens stay clean — no banners obscuring your keys.

Built by developers, for developers. Feedback and feature requests are welcome at the contact link inside the app.