Projects

Hands-on projects and free tools built and documented by Arelvox. Everything runs in your browser, with no sign-up. More Raspberry Pi builds, automation scripts and hardware experiments are on the way.

2048 gameGame · New2048 GameThe classic number puzzle, free in your browser, with undo and autosave.Play now → Sky Stack stacking gameGame · NewSky Stack: Stacking GameOne tap to drop each block. Chain perfect drops and build the tallest tower. Works great on phones.Play now → Root Access hacker idle gameGame · FreeRoot Access: Hacker Idle GameA free idle game in your browser. Hack for data, deploy programs, unlock upgrades and go dark for reputation.Play now → Bug Hunt: Typing GameGame · FreeBug Hunt: Typing GameSquash falling bugs by typing programming words. Beat your high score and type faster.Play now → Crack the CodeDaily puzzle · FreeCrack the CodeA new 4-digit code every day. Six tries, color clues and a result to share.Play today → Subnet calculator showing network and host bitsNetworking · Free toolIP Subnet CalculatorSplit any IPv4 address into network, broadcast and usable host range. Supports CIDR notation, subnet and wildcard masks, IP class and binary view.Open tool → Chmod calculator showing 755 as rwxr-xr-xLinux · Free toolChmod CalculatorConvert Linux file permissions between numbers like 755 and symbols like rwxr-xr-x, with presets and a ready-to-copy chmod command.Open tool → Resistor color code calculatorElectronics · Free toolResistor Color Code CalculatorRead 4-band and 5-band resistors in seconds, or type a value like 4.7k to see which color bands to look for.Open tool → Linux command generatorLinux · Free toolLinux Command GeneratorPick a task, fill in a few fields and copy the exact terminal command, with every option explained in plain English.Open tool → Ohm's Law CalculatorElectronics · Free toolOhm’s Law CalculatorEnter any two of voltage, current, resistance and power to get the other two, with the formulas shown step by step.Open tool → LED Resistor CalculatorElectronics · Free toolLED Resistor CalculatorFind the right resistor for any LED on Arduino, Raspberry Pi or any supply, with the power rating and color bands.Open tool → Cron Expression GeneratorLinux · Free toolCron Expression GeneratorBuild crontab schedules without memorizing the syntax, explain any expression and see the next run times.Open tool → Password GeneratorSecurity · Free toolPassword GeneratorCreate strong random passwords and passphrases with a strength meter. Generated in your browser, never sent anywhere.Open tool → Base64 Encoder and DecoderDeveloper · Free toolBase64 Encoder and DecoderEncode and decode Base64 in real time, with UTF-8, URL-safe mode and file to data URI conversion.Open tool → Unix Timestamp ConverterDeveloper · Free toolUnix Timestamp ConverterTurn epoch time into a readable date in your time zone or UTC, convert any date back to a timestamp, and see the current time.Open tool → Voltage Divider CalculatorElectronics · Free toolVoltage Divider CalculatorFind the output voltage from two resistors, or the R2 you need for a target voltage, with standard values, current and power.Open tool → Download Time CalculatorNetworking · Free toolDownload Time CalculatorEnter the file size and your internet speed to see how long a download will take, with real-world overhead and common speeds.Open tool →