Free plan available. hark pro² at $20/month with 2× more usage. hark pro³ at $100/month with 10× more usage. All features available in all plans; upgrading increases usage capacity.
Free 100M tokens for new users. $0.04 per 1M tokens for input tokens.
Key features
Persistent memory to tailor responses based on shared context
Computer use agent for browsing, research, and web tasks
End-to-end encryption for data security
Action Buttons for prioritized task completion
Email management and sorting
Flight booking and travel planning
Food ordering integration
Appointment booking and healthcare search
Expense auditing and savings recommendations
384K token context window
Multimodal input support
100K tokens processed in less than a second
Structured output for direct code use
Subquadratic Sparse Attention algorithm for efficient compute
$0.04 per 1M tokens pricing
Customer content not used for model training
Data retention limited to 60 days
What makes it different
Operates its own secure computer with full browser for independent task execution
End-to-end encryption vault for sensitive data protection
User approval required before performing sensitive actions
All features available across free and paid tiers
First long-context decision model purpose-built for enterprise work
Frontier-level decision-making performance at 5-10x lower cost than frontier LLMs
Tied for #1 on Artificial Analysis Decision Index
Processes entire codebase or data room in single context window
Hark
Subquadratic