Can I use a different device with the Elonga app?

Can you use the Elonga app with another sensor or device? For example a chest strap, smartwatch, or another optical HR monitor?
Short answer:

No — the app is only compatible with the Elonga sensor.

The reason is not a technical limitation, but the fact that accurate HRV and ANS analysis requires a specific type of signal acquisition that other devices cannot provide.

1. Why can’t other devices be used?

Data accuracy depends on:

• correct sensor placement

• proper skin contact

• method of attachment

• stable signal quality

• compatibility with the HRV analysis pipeline
  

Other devices simply do not meet these requirements. They measure in different ways, on different body parts (e.g., wrist), or produce signals the app cannot process.

2. HRV in Elonga is not standard heart-rate monitoring

The Elonga sensor does not just measure heart rate. It uses:

• spectral HRV analysis

• high-quality raw signal acquisition

• high-resolution data

• short-term ANS variability

No commonly available third-party device can deliver this signal quality.

3. Why can’t smartwatches or chest straps be used?

Smartwatches

• use optical measurement from the wrist

• the signal is affected by motion, temperature, and blood flow

• not suitable for precise resting-state HRV

Chest straps

• use a different type of electrical sensing

• are incompatible with Elonga’s data processing

• cannot be paired with the app

4. The app is designed for one specific sensor

This ensures:

• consistent data quality

• scientifically valid results

• reliable ANS evaluation

• full functional compatibility

Using any other device would break HRV accuracy and long-term trend validity.

5. What if the sensor doesn’t suit you?

If you struggle with:

• placement,

• strap fit,

• comfort during measurement,

try alternative positions on the forearm or upper arm. If technical issues occur, support will help you resolve them.

Summary

• The Elonga app cannot be used with any other sensor or device.

• Other devices lack the required HRV signal quality.

• Elonga is engineered for precise measurement exclusively with its own sensor.

• Using another device would produce invalid results.