LettavsNinjaChat

Full side-by-side comparison — features, pricing, platforms, and which one wins in 2026.

Letta

AI Agent Frameworks

Build stateful AI agents with long-term memory

Full review →Website ↗

NinjaChat

Chat Interfaces

31+ free AI tools online — no signup required

Full review →Website ↗
FeatureLettaNinjaChat
CategoryAI Agent FrameworksChat Interfaces
PricingFree (open-source) + CloudFree (no signup), premium plans available
GitHub Stars
✓ More stars
13k
—
PlatformsLinux, macOS, Docker—
Key Features
  • ✓ Long-term memory
  • ✓ Stateful agents
  • ✓ Tool use
  • ✓ Multi-model
  • ✓ Self-editing memory
    Pros
    • + Solves long-term memory problem
    • + Self-editing memory
    • + Stateful agents
    • + Multi-model support
    • + Active research backing
    • + No signup required
    • + 30+ tools in one place
    • + Free to use
    • + Browser-based
    Cons
    • − Complex memory management
    • − Performance overhead
    • − Rebranding confusion
    • − Still experimental
    • − Cloud-only (no self-hosting)
    • − Limited customization
    Tags
    memorystatefulagentsopen-source

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