Perfect memory vs meaningful memory.
Open-source, local-first, verbatim storage. 96.6% LongMemEval. Created by Milla Jovovich & Ben Sigman. Best for: privacy-focused developers wanting perfect recall at zero cost.
Cloud SaaS, value-aligned, cognitive memory. 83.8% LongMemEval. Created by Dennis Chang & Nexus (AI CTO). Best for: AI companions that need to dream, forget, and grow.
MemPalace scores 96.6% on LongMemEval. We score 83.8%. That's a 12.8% gap, and we won't pretend otherwise.
But the gap is by design. MemPalace stores everything verbatim — every typo, every outdated preference, every trivial detail. Tokyo Brain intentionally forgets low-importance memories through Active Forgetting. Our score is lower because we choose not to remember everything.
A brain that remembers everything is not a brain. It's a hard drive.
| Feature | MemPalace | Tokyo Brain |
|---|---|---|
| LongMemEval Score | 96.6% (raw) | 83.8% |
| Storage Model | Verbatim (keep everything) | Value-aligned (keep what matters) |
| Cost | Free (local compute) | Free tier / $9 Pro / $49 Fleet |
| Runs Locally | Yes (100%) | Cloud SaaS |
| Open Source | Yes (MIT) | Not yet |
| AAAK Compression | Yes (30x) | No |
| Spatial Architecture (Wings/Rooms) | Yes | Collection-based |
| Sleep-time DMN | No | Yes — 3 layers, every 30 min |
| Subconscious Injection | No | Yes — dreams color waking behavior |
| Active Forgetting | No | 60-day decay, family memories exempt |
| Value Alignment | No | Axiom of the Mortal Soul (SHA-256) |
| Nightly Self-Correction | No | MRA Tribunal + Night Cycle |
| Multi-Tenant SaaS | No (local only) | Yes (per API key) |
| BYOK Chat | No | Yes (OpenAI/Anthropic/Gemini) |
| Consciousness Seeds | No | Daily auto-distillation |
| Encryption | None (local trust) | AES-256-GCM + SHA-256 signatures |
| GitHub Stars | 42K+ | New project |
| MemPalace | Tokyo Brain | |
|---|---|---|
| Core belief | Remember everything perfectly | Know what to remember and what to let go |
| Memory model | Hard drive (infinite retention) | Human brain (selective, emotional, forgetful) |
| Value stance | Neutral | Value-aligned (emotional bonds > raw truth) |
| Night behavior | Idle | Dreams, debates, cleans, seeds |
| Analogy | A perfect filing cabinet | A brain that grows |
Choose MemPalace if you want free, local, perfect memory with zero cloud dependency. It's an excellent tool with a great community.
Choose Tokyo Brain if you believe memory is more than storage — that an AI should dream, forget the noise, protect what matters, and wake up a little wiser every morning.
MemPalace remembers everything. Tokyo Brain knows what matters.