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MemPalace vs Prefactor
A side-by-side comparison of pricing, ratings, features, pros and cons.
| Overview | |||
| Description | Open-source AI memory system that stores full conversations and project data locally without cloud dependencies. Organizes memories into a hierarchical "palace" structure, achieves 96.6% recall on LongMemEval benchmarks (highest scoring), supports MCP integration and works offline with local LLMs. | Runtime evaluation platform that continuously monitors, scores, and can pause risky AI agent actions in production. | |
| Category | |||
| Developer | milla-jovovich | Prefactor Pty Ltd | |
| Verified Status | No | No | |
| Last Updated | Aug 2026 | Aug 2026 | |
| Pricing | |||
| Pricing Model | Free | Freemium | |
| Free Plan | Yes | No | |
| Free Trial | — | No | |
| Open Source | No | No | |
| Capabilities | |||
| API Access | — | No | |
| Features | • Verbatim conversation storage — no summarizing, extracting, or paraphrasing of stored text • 96.6% recall@5 on the LongMemEval benchmark, fully local with zero API calls • Structured index: people/projects organized as "wings", topics as "rooms" • Pluggable storage backend • Dedicated retention setup path for Claude Code's 30-day session expiry • Free and open source, distributed via GitHub and PyPI | • Real-time tracing of every agent action • LLM-as-judge and technical evaluation scoring • Automatic policy enforcement and action pausing • Human-in-the-loop approval via SDK/API • Multi-framework SDKs (LangChain, Claude, Vercel AI) • Free tier: 25,000 spans/month | |
| Tags | mempalaceopensourcememorysystemstores | ai-agent-evaluationruntime-observabilityagent-governancellm-as-judgeagent-lifecycle-management | |
| Trust and Engagement | |||
| Review Count | 0 | 0 | |
| Saves | 0 | 0 | |
| Views | 58 | 4 | |
| Quality Score | 62/100 | 37/100 | |
| Website Status | Online | Online | |
| Availability | |||
| Website | github.com | prefactor.tech | |
| Social Links | 1 linked | 2 linked | |
| Screenshots | No | No | |
| Reviews | |||
| Pros | • Free to use | • Free to use | |
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