heyData alternatives: 4 tools compared (October 2026)

DataGuard is a compliance platform from Munich that combines software for privacy, information security and EU AI Act readiness with AI automation and optional external experts.

Key functions

• AI suggests answers to security questionnaires based on previously validated data
• AI identifies and prioritizes security and compliance risks with remediation guidance
• Automated evidence collection and audit preparation

Compared with heyData

• Strong in the same markets as heyData: Germany.

Check before buying: All plans are priced by quote, so compare what expert support is included in Pro and Enterprise. The website does not name data hosting locations or certifications in plain text; check them in the trust center. Decide whether you need an external data protection officer, since that changes the plan.

MOSTLY AI generates synthetic versions of sensitive tabular data, so banks, insurers and other companies can share, test and analyze data without exposing real personal records.

Key functions

• Generative models (TabularARGN) create synthetic tabular and text data
• Differential privacy as a training option
• AI assistant writes Python code and analyzes data from natural language prompts

Compared with heyData

• Built for larger organizations than heyData's smallest customers.
• Strongest elsewhere: Austria.

Check before buying: Since Syntho acquired the MOSTLY AI brand in June 2026, ask which company is your contracting partner and how support and the platform roadmap continue. Decide whether the open-source SDK in your own environment is enough or whether you need the platform, whose prices are only available on request. Have your data protection officer assess whether the synthetic output counts as anonymous for your use case. When real employee data is used as input, check co-determination and data processing terms.

OneTrust is a governance platform for privacy, consent, data use, technology risk, third parties and AI, aimed at large organizations that need one system for these programs.

Key functions

• Discovers AI systems, agents, models and datasets and keeps them in one inventory
• Automates risk tiering aligned to the EU AI Act, NIST and ISO 42001
• AI Guard SDK detects sensitive data in prompts and responses before the model sees it

Compared with heyData

• Built for larger organizations than heyData's smallest customers.
• Strongest elsewhere: United States.

Check before buying: OneTrust does not publish prices, and licensing depends on the modules chosen, so scope the modules first. Check whether runtime controls cover your AI platforms, since the page names Amazon Bedrock and Microsoft Foundry. Ask for data hosting regions and certifications, which the pages we checked did not state.

Syntho produces synthetic test data for software development, testing and analytics, combining AI-generated data, rule-based generation and masking so companies can work with production-like data without exposing real records.

Key functions

• AI-generated synthetic data reproduces statistical patterns of real data
• Sensitivity scanner finds protected fields in databases
• Quality reports compare synthetic and original data

Compared with heyData

• Built for larger organizations than heyData's smallest customers.
• Strongest elsewhere: Netherlands.

Check before buying: Syntho is licensed per year by tier and number of database connections, and additional deployment locations cost extra. Since it runs in your environment, plan infrastructure and operations. Have the data protection officer confirm that the synthetic or masked output meets your anonymization requirements.