Kaleyra is the CPaaS brand of Tata Communications, which now publishes its product pages. Customers use the Kaleyra.io console and APIs to send messages and run campaigns. Tata Communications cites 60Bn+ annual interactions and 99.9% API uptime on its RCS page.
Prices are not published. Kaleyra.io accounts are prepaid with credits, and Tata Communications quotes through sales.
Kaleyra has no iMessage. Both offer SMS and RCS. Kaleyra adds WhatsApp, MMS, voice, video and email, while Linq's WhatsApp API is in beta and its API only forwards inbound calls. Linq publishes a flat monthly price from $260 with no per-message fees.
Large businesses, especially in India and markets Tata Communications serves, that want SMS, RCS, WhatsApp and voice from one carrier-backed platform.