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Take the Vagal Tone Test
2 minutes. Science-backed. Find out how your vagus nerve is performing.
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Our Devices
Vagal Oh!
Vagal Oh!
Wireless. App-controlled. Zero wires.
› Vagal Buddy tVNS
Vagal Buddy tVNS
Clinical-grade. Doctor recommended.
› Vagal Boost
Vagal Boost
Entry-level. Phone-powered.
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Learn about your vagus nerve › See how tVNS works in 3D › Help me choose a device › EverSteady Technology › Join our HRV Study ›
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Vagal Tone Research Portal

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Click Connect to pair your stimulator
Local Tone Library
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Device Tones
Connect a device to see its three tones
My Tones
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Connect a device to enable controls. Full Control Surface →
Target Current
800uA
Actual: 0 uA
00:00
Idle
MCP Relay inactive
Worker--
Claude--
Commands0
Parameters
-- waveform Tone slot: --

HRV Monitor

Monitor heart rate variability in real-time with a Bluetooth chest strap. Track RMSSD, SDNN, pNN50, and vagal tone score during your stimulation sessions.

Open HRV Monitor

HRV monitoring uses a separate Bluetooth connection (chest strap) and opens in a dedicated page.

Connect a device to enable edition conversion.

Edition Conversion

Convert your device between Basic and Research editions. Research Edition unlocks full parameter control, sham mode, data export, and API access.

Connected Device
Not connected
--
Connect a device and log in to check your Research Edition access status.

Conversion takes a few seconds. Keep your device nearby.

Activity Log

Firmware Update

Keep your stimulator on the latest firmware. The update is checked for you when you connect.

1Connect and check

Turn the device on and keep it awake. Nothing is written to it in this step. A device already stuck in update mode is picked up here too, and jumps straight to step 3.

2Put the device into update mode

Stop any running session first. The device restarts into update mode, advertising a name ending in DFU, and stays there for about two minutes. There is no rush after this - if it times out and returns to normal, just start again.

3Select the DFU device and flash

The chooser is filtered to the update service, so your device's DFU entry should be the only thing listed. Take your time. Do not close this tab while it writes.

Advanced