Both tools have similar popularity levels, with Letta having 23,957 stars and Supermemory having 28,610 stars on GitHub. In terms of developer contributions, Letta has 2,549 forks, indicating strong developer engagement.

Both projects show recent activity, with Letta last updated 4 days ago and Supermemory 12 hours ago.

Both tools share common technology foundations, being built with JavaScript, CSS, Typescript. However, they differ in their additional technology choices: Letta uses Bash, Python while Supermemory leverages JSX.

Both projects started around the same time, with Letta beginning 3 years ago and Supermemory 2 years ago.

Supermemory uses the MIT license, which is more permissive than Letta's Apache-2.0 license, potentially offering greater flexibility for commercial use and integration.

Both tools serve similar use cases in AI Memory & Context. However, they also have distinct specializations: Letta also focuses on AI Agent Platforms.

Supermemory provides self-hosting options for complete data control and customization, while Letta may be primarily cloud-based or require different deployment approaches.