Mem0 is an open-source-rooted memory framework with a large developer community and a hosted API. You write code to embed it; it is infrastructure for the app you are building, not something a non-developer uses directly.
Supermemory is usage-priced memory infrastructure — an API and MCP server with connectors — aimed at developers building agents. It also offers a second-brain surface, but its centre of gravity is the developer console and metered API (it advertises sub-300ms search).
Alma is a finished AI workspace: sign up, chat, and the memory works without code. It has a 3-layer typed memory plus the Soul Engine, creative studios and calendar, runs on EU-edge infrastructure, and charges a flat monthly budget. Developers who also want an embeddable layer get the SDK, REST API and MCP server on every paid plan.
Decide by whether you are building or using. Building your own AI product and want a memory backend you control? Mem0 (open, framework-friendly) or Supermemory (usage-priced infra). Want to use AI with memory across the tools you already work in, on a predictable plan, without writing glue code? Alma.