The OS for Off-Grid Messaging.
Transform your mesh radio into a powerful bilingual messenger. Connect anywhere—no internet required.
The Whisper Ecosystem
Bringing intelligence to bare-metal mesh hardware.
Whisper OS
The ultimate off-grid firmware.
Turn raw radio hardware into a seamless communication tool. Whisper OS gives you intuitive messaging, live radio diagnostics, and smart predictive text—all built perfectly for small screens.
Highlight Features
Ultra Power Save
- World's best power-saving mesh OS
- 7 days of standby with light messaging on Heltec V3 & V4
- Stretches battery life for extended field trips
- Proven power savings across all supported devices
All devices
Intelligent Input Suite
- Next-gen predictive text (EN/CN)
- Full Pinyin IME with phrase suggestions
- Plug in a CardKB mini keyboard anytime — it connects instantly
- Smart word completion as you type
Wio Tracker L1, GAT562, Meshtiny
GPS Duty Cycle
- Pick a GPS mode that matches the mission
- Trade fix frequency for battery life directly
- Clear presets from basic to ultra eco
- Built for GPS-equipped field hardware
Supported GPS-equipped devices
Radio & Repeater
- Read frequency, bandwidth, and spread factor fast
- Watch noise floor and channel conditions live
- Make setup decisions from device-side diagnostics
- Useful in the field when a laptop is not around
All devices
Morse Code Input
- Send messages using morse code
- Perfect for stealth communication
- Alternative input method
All devices with morse support
GPS Privacy Control
- Toggle coordinate visibility on/off
- Keep your location private
- One-tap coordinate hiding
All GPS-equipped devices
Messaging
Quick messages & virtual keyboard
Customizable preset phrases, delivery status
Keyboard
CardKB physical keyboard support
Hot-plug detection almost instant
Languages
English, Chinese, Japanese, Korean
Full multilingual message support
Display
Always-on clock modes
Default, Binary, Cat, Dog faces
Network
Repeater mode with live stats
Packet forwarding visualization
Power
Optimized for longer battery life
Accurate battery meter, smarter sleep
Updates
BLE OTA firmware updates
One-tap bootloader (nRF52)
Supported Devices
FoBE Quill, GAT562, Heltec T096, Heltec T114, Heltec Tracker V2, Heltec V3/V4, MeshTiny, ProMicro, RAK4631, Wio Tracker L1
🎁 Bundle deal: the 4th key is on us.
Buy 3 premium keys in one order and we will automatically add a free extra key.
Our Partners
Working together with industry leaders to bring you the best mesh networking solutions
