Supported Signals

Provider-specific and open watermark schemes. Status reflects current public detection capability — not partnership claims.

Google SynthID Text

Analyzed
Provider
Google / DeepMind
Mechanism
Statistical watermark applied to token selection probabilities during generation
Availability
Scanned on every analysis. Public third-party detection capability remains limited.
Limitations
Requires Google’s detection infrastructure or an equivalent published method. Not claimed as an official partnership.
Last updated
August 2026

Claude Text Watermark

Analyzed
Provider
Anthropic
Mechanism
Not publicly documented for third-party detection
Availability
Checked on every scan. No public detection method is currently offered by the provider.
Limitations
No public detector or open specification is available. No proprietary algorithm is reverse-engineered here.
Last updated
August 2026

OpenAI Text Watermark

Analyzed
Provider
OpenAI
Mechanism
Research into statistical watermarks has been published; no production public detector is available to third parties
Availability
Checked on every scan. No public detection endpoint is offered.
Limitations
No official public detection endpoint exists for production use by third parties.
Last updated
August 2026

Open-Source Statistical Watermarks

Analyzed
Provider
Research / Community (e.g. Kirchenbauer-style soft watermarks)
Mechanism
Bias token sampling according to a secret key and hashing of previous tokens
Availability
Scanned when possible. Detection requires knowledge of the key used at generation time.
Limitations
Without the original key, reliable detection is generally not possible.
Last updated
August 2026

Custom Developer Watermark

Analyzed
Provider
User-defined
Mechanism
Developer-supplied detection parameters when provided
Availability
Available when a detection key is supplied. Otherwise reported as not detected.
Limitations
Requires the developer to share detection keys/parameters. Not applicable to arbitrary third-party text.
Last updated
August 2026

Important: This page does not claim official partnerships with Google, Anthropic, OpenAI, or any other company. Status labels reflect technical availability of public detection methods only.

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