Mindfield eSense SDK for mobile, cross-platform & VR apps (iOS, Android, Flutter, Unity, Unreal)

Who is this SDK for?

For developers building mobile biofeedback apps for iOS and Android – from clinical apps and stress-management tools to game and VR applications. You get raw and calibrated sensor data in real time for skin conductance (EDA/GSR), skin temperature and respiration, plus a ready-made connection for the pulse sensor via the Bluetooth heart-rate standard. Integrate natively (Kotlin, Swift) or via cross-platform frameworks (Flutter, Capacitor/Ionic, Unity, Unreal).

What’s included

Audio-based SDK for the three eSense audio sensors plus pulse connectivity via the Bluetooth standard:

• eSense Skin Response — electrodermal activity (EDA / GSR), calibrated values in microsiemens (µS)
• eSense Temperature — skin temperature in °C or °F
• eSense Respiration — breathing amplitude (RA)
• eSense Pulse — heart rate (BPM) and RR intervals via the Bluetooth heart-rate service standard (UUID 0x180D), no custom SDK required

Native SDKs & plugins included:

• iOS / iPadOS (Swift, Swift Package Manager) and Android (Kotlin)
• Flutter plugin (Dart) and Capacitor plugin (TypeScript, incl. OSC & LSL utilities) for iOS + Android
• Unity Audio plugin (C#) for game and VR development
• Unreal Engine plugin (C++/Blueprint, UE 5.4) with Android target for Meta Quest / Pico

Also:

• Fully functional demo app in source code
• API documentation and quick-start guide
• Lifetime updates of the purchased platform version
• Unlimited commercial and non-commercial use, no royalties

Technical specification

Sensors for mobile apps

Muscle (EMG) & EEGenius (EEG) are integrated via the Unity C# plugin.

The mobile demo app in action (iOS / iPadOS)

The included demo app streams the audio sensors in real time – here on the iPad:

VR support (Meta Quest & Pico)

Modern VR headsets are standalone Android devices – the eSense plugins run directly on the headset. You connect the audio sensors via the Unreal plugin (Android target, UE 5.4), hardware-tested on the Meta Quest 3S and supported on Meta Quest 2 / 3; Pico 4 Ultra (+ Enterprise) are in preparation. The Bluetooth sensors eSense Muscle (EMG) and eSense EEGenius (EEG) are reached via the Unity C# plugin.

Adapter and connection compatibility

The eSense audio sensors (Skin Response, Temperature, Respiration) connect via the 3.5 mm audio jack. Current smartphones without a jack require an active DAC adapter:

• iPhone (USB-C from 15 / Lightning up to 14): Apple DAC adapter (USB-C or Lightning to jack) or an equivalent branded DAC
• Android: USB-C-to-3.5 mm adapter with active DAC electronics (passive adapters do NOT work)
• Tablets / Quest VR: tested with standard USB-C DAC adapters

A wireless Bluetooth variant of the audio sensors (Skin Response, Temperature) is in development and will make the audio adapter unnecessary from Q1 2027.

Pulse sensor: Bluetooth standard, no custom SDK needed

The eSense Pulse implements the official Bluetooth SIG standard Heart Rate Service (service UUID 0x180D, Heart Rate Measurement characteristic 0x2A37). You don’t need a vendor-specific SDK – the native Bluetooth APIs of your platform are sufficient. Full code examples including a parser for the flags byte (UINT8 vs. UINT16) ship with the demo app.

Use cases

• Mobile biofeedback app — stress, relaxation or breathing training for iOS and Android
• Cross-platform app — one codebase for iOS + Android via Flutter or Capacitor
• VR application — immersive biofeedback experiences on Meta Quest / Pico
• Research & serious games — feed physiological signals into interactive scenarios

Frequently asked questions

Related products

eSense Professional Sets

• eSense Complete Set for Professional Users (incl. SDK) — all sensors plus SDK bundled
• eSense Complete Set for Professional Users (without SDK)

The individual eSense sensors

• eSense Skin Response — skin conductance (EDA · µS)
• eSense Temperature — skin temperature (°C / °F)
• eSense Respiration — respiration (RA)
• eSense Pulse — heart rate (BPM · HRV)
• eSense Muscle Home & eSense Muscle Pro — muscle activity (EMG · µV)
• eSense EEGenius — EEG (µV)

Other eSense SDKs

• eSense SDK for Windows — all six sensors natively (.NET 10)
• eSense SDK for macOS
• eSense SDK for Muscle / EEGenius (C# for Unity, EMG/EEG)

Apple, iPhone, iPad, iPod touch are trademarks of Apple Inc., registered in the U.S. and other countries. | IOS is a trademark or registered trademark of Cisco in the U.S. and other countries and is used under licence. | Android is a trademark of Google LLC | The Bluetooth® word mark and logos are registered trademarks owned by Bluetooth SIG, Inc. and any use of such marks by Mindfield Biosystems Ltd. is under license. Other trademarks and trade names are those of their respective owners.