revenue-activation
(2)
Hyperbound
Hyperbound is a San Francisco-based AI sales roleplay and coaching platform that turns real customer-call patterns into lifelike AI buyer simulations, letting sales teams practice cold calls, discovery, and objection-handling at scale. Founded in 2023 by Sriharsha Guduguntla and Atul Raghunathan, the Y Combinator-backed company raised a $15M Series A in September 2025 led by Peak XV Partners.
Letter AI
Letter AI is an AI-native revenue enablement platform that turns a company's existing knowledge into real-time, deal-specific guidance for sales, customer success, and sales engineering teams. Founded in 2023 by Ali Akhtar and Armen Forget and backed by Y Combinator, the Chicago-based company combines content, coaching, training, and live CRM data into one workflow. In February 2026 it raised a $40M Series B led by Battery Ventures to power its new deal-level product, Letter Compass.