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Device Fingerprint gives every device a stable identifier and a risk score — without relying on cookies, advertising IDs, or any user-visible prompt. The SDK runs passively in the background, collecting device signals and returning a deviceId, a riskScore, and the specific signals that contributed to the score.

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Persistent device ID

Unlike advertising IDs or cookie-based identifiers, the OTPless device ID is engineered to survive events that normally reset tracking:
  • App reinstalls
  • Factory resets
  • OS updates
  • Advertising ID resets
This means you can recognise a returning device even when a user creates a new account, allowing you to correlate suspicious behaviour across sessions and identities.

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Risk score

Every call to getDeviceIntelligence() returns a risk score from 0 to 100. These thresholds are a starting point. Set your own cut-offs based on the sensitivity of the action being performed.

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Risk signals

The risk score is derived from a set of device signals. Signals are returned server-side only — they are not included in the client response.

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How to act on the score

Allow

Low score — no unusual signals. Continue the user’s session without interruption.

Step-up

Elevated score — require an additional verification factor before allowing a sensitive action.

Block

High score or critical signal (e.g. emulator, tampered) — deny the request and surface an appropriate error.

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When to use it

  • Account creation — flag devices with high risk scores before an account is created
  • Login — identify repeat offenders across account resets
  • Transactions — add a device-level check before fund transfers or profile changes
  • Abuse prevention — detect emulators used in bulk account creation or credential stuffing

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Platform support

Risk signals are served server-side only. Your backend receives the full signal set; the client response includes only deviceId and riskScore.

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Integration

Native SDK for Android and iOS — passive, no login widget, no Pre-Built UI or Headless split.

Android SDK

Add Device Fingerprint to your Android app.