Hotaru - Pen-light & LED

Hotaru turns your smartphone into a glowing pen-light. For every moment you want to cheer — concerts, live shows, baseball stadiums, soccer matches, marathons, and more. Pick your favorite's color from 16 presets and tap "Light up fullscreen." Your whole screen becomes a pen-light. No ads, no sign-up, completely free. [Features] ■ 16 color presets Snow, Crimson, Coral, Tangerine and more — 16 refined colors that shine at the venue. Swipe left or right while lit to change colors. ■ Show a message inside the pen-light Display your favorite's name, a heartfelt message, or any text inside the light. Short text appears large and centered; longer text scrolls smoothly like an LED ticker. Mix kanji, kana, Latin letters, and emoji freely. Tap any of your last 8 entries to reuse it. ■ Vertical / horizontal writing Toggle between traditional Japanese vertical text and Western horizontal text in the input sheet. ■ LED ticker mode (landscape) Turn your phone sideways and the pen-light becomes a horizontal LED ticker — perfect for stadiums, ballparks, festivals, and marathons where you want your message seen from afar. ■ Pen-light mode A glowing-baton display mode. Tilt your device and the light sways for a realistic pen-light feel. [Not just concerts — cheer at sports too] - Baseball — wave in your team's colors to the fight song - Soccer / stadiums — show a player's name or number - Marathons — raise a runner's name from the roadside - Sports days & school festivals — light up in team colors ■ Brightness lock In fullscreen mode the brightness is locked to a fixed value so it blends with other pen-lights at the venue. Adjust the limit in Settings. ■ Dark mode Switch to Dark in Settings to keep the whole UI low-light, so you won't disturb others in a dark venue. The lighting color itself is unaffected. ■ Safety first A drop-prevention notice is shown on first launch. [Privacy] - Zero ads - No sign-up (no email / social login) - Data stays only on your device - Zero third-party SDKs, zero analytics [Before you use] Always check the venue's rules on smartphone use. Always attach a strap or other drop-prevention device and keep it around your wrist. The developer assumes no responsibility for accidents or damages resulting from use of this app. [Developer] KARABINA LLC (Tokyo, Japan) We build small utilities for live-event fans.