Overview
Client-side A/B testing tag that modifies the DOM before page render, giving it full access to page context and any personal data displayed on screen. Sets first-party cookies to track visitor identity and experiment assignments across sessions. Following the January 2026 merger with VWO under Everstone Capital, organisations should verify that data processing arrangements reflect the current corporate structure.
Detection capabilities
- Signature count
- 8
- Detection methods
- network
- Property types
- hostnamepathnameparam
Performance impact
Performance Impact
- Script size
- 45 KB
- Requests per page
- 6
Common mistakes
- 1Assuming A/B testing is exempt from consent requirements - AB Tasty sets cookies and processes visitor behaviour data, which typically requires consent under the ePrivacy Directive
- 2Not controlling which experiments run on which pages, leading to unnecessary data collection and DOM manipulation across the entire site
- 3Deploying personalisation features based on behavioural profiling without assessing whether this constitutes automated decision-making under GDPR Article 22
- 4Failing to document active experiments in the organisation's Record of Processing Activities, as each experiment may involve distinct data processing purposes
- 5Running experiments on sensitive user journeys (payment flows, account management) without assessing the impact on accessibility and user experience for all visitor segments
Compliance considerations
AB Tasty sets first-party cookies (ABTasty, ABTastySession) to identify visitors and assign them to test variations. Under GDPR and the ePrivacy Directive, this cookie-based tracking typically requires consent, although some organisations argue that A/B testing for service improvement may qualify for legitimate interest - this position should be validated with your DPO. AB Tasty is a French company and offers EU data hosting, which simplifies data transfer compliance for European organisations. However, any integration with third-party analytics platforms (e.g., sending experiment data to Google Analytics) introduces additional transfer considerations. Organisations should ensure AB Tasty is included in their CMP configuration and that personalisation features are assessed for GDPR Article 22 implications regarding automated individual decision-making. In January 2026, AB Tasty merged with VWO (Wingify) under Everstone Capital — verify data processing arrangements reflect the current corporate structure.
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