Tab emerged from stealth as a personal AI assistant. It reached a $300 million valuation on launch. Users text it on iMessage or WhatsApp to handle tasks. It has its own phone number, computer and wallet. It performs actions rather than giving instructions. Brennan Erbz, Stafford Schlitt and Ammar Amdani founded it earlier this year. Investors include SV Angel, Valar Ventures and American Spirit. Tab positions trust as its main product. It does not use customer data for training. It requires explicit approval for irreversible actions.

• $300M valuation