Explore how to create offline tools using Arduino and ESP32 in this 45-minute conference talk. Learn about various DIY projects that demonstrate the power of hardware-based solutions, including an offline RFID audio box, a customizable touch/keyboard interface, a time-tracking cube, and a secure chat system. Discover how software skills can be applied to hardware development, making it accessible for those familiar with programming. Gain insights into power-saving techniques, 3D printing applications, and mobile solutions. Examine specific projects like TonUINO, HID personal customizable touch panel, and a 12-sided time-tracking cube, with some code available on GitHub. Empower yourself to develop offline alternatives to common online tools and break free from constant connectivity.