Best Mem0 Alternative | AI Memory API Comparison

Benchmark scores

LongMemEval accuracy

LongMemEval (ICLR 2025). 500 questions, 6 categories.

System	Score	Questions tested	Model	Architecture
AgentMemory	96.2%	500 (full)	GPT-4.1	Hybrid retrieval (no product)
REM Labs	97.2%	500 (full)	GPT-4o	Proprietary ensemble + reranking
OMEGA	95.4%	500 (full)	GPT-4.1	SQLite + bge-small + full-text
Mastra OM	94.9%	500 (full)	GPT-5-mini	Observational (no retrieval)
Supermemory	81.6%	500 (full)	GPT-4o	Atomized memory units
Zep / Graphiti	71.2%	500 (full)	GPT-4o	Temporal knowledge graph
ChatGPT Memory	57.7%	500 (full)	GPT-4o	Native memory feature
Mem0	~66.9%	500 (full)	GPT-4o	Flat vector storage

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A note on methodology

All scores on this page are from the full 500-question LongMemEval benchmark (ICLR 2025) using GPT-4o as judge unless noted otherwise. Our 97.2% (486/500) is independently reproducible. Full methodology.

Feature comparison

Universal memory vs. single-tool systems

Different architectures, different tradeoffs.

Feature	REM Labs	Mem0	Zep	OMEGA	Supermemory	Mastra
Search modes Number of distinct retrieval strategies	8 modes	2	2	3	2	0 (stores all)
Memory Synthesis Processes and consolidates memories via API	Multi-stage synthesis pipeline	None	None	Basic evolution	None	Observer/Reflector
Consumer app Usable by non-developers	Full web app	API only	API only	CLI only	Nova app	Framework
Scheduled Synthesis Automated consolidation runs via API	Daily	None	None	None	None	None
Knowledge graph Entity extraction and relationship mapping	Included	$249/mo	Graphiti (core)	Typed edges	Relational	None
Temporal reasoning Time-aware queries and fact versioning	valid_from/until	None	Validity windows	Decay + TTL	Dual timestamps	3-date model
Import from ChatGPT/Claude Bring your existing conversation history	One-click	None	None	None	Chrome ext	None
MCP server Works with Claude, Cursor, and MCP hosts	Native	OpenMemory	None	12 tools	Yes	None
Self-hostable Run on your own infrastructure	SQLite, no deps	OSS / Enterprise	Enterprise VPC	Fully local	Open source	Open source
Open source Core codebase publicly available	Benchmark only	Apache 2.0	Graphiti: MIT	Apache 2.0	Open source	Open source
SDK languages Official client libraries	Node/TS, CLI	Python, TS	Python, TS	MCP only	Python, TS	TS (native)
Total integrations AI assistants, frameworks, tools, productivity	40+	21+	5-6	Claude Code	10+	Native framework
SOC 2 / HIPAA Enterprise compliance certifications	Not yet	Both	Both	None	None	None
Memory decay / lifecycle Automatic importance scoring and forgetting	Full lifecycle	None	Validity windows	TTL + decay	None	Compression
Team / org memory Shared memory across team members	Built in	None	Projects	None	Projects	None

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Honest assessment

Where others are ahead

Mem0

Largest community in AI memory

48K GitHub stars, 21+ integrations, SOC 2 + HIPAA. The widest ecosystem.

Zep

Best temporal modeling

Graphiti gives facts validity windows, not just timestamps. Academic credibility via arXiv.

OMEGA

True local-first, verified benchmark

95.4% on full LongMemEval with zero cloud dependencies. Runs entirely on-device.

Mastra

Extreme token efficiency

3-40x compression on long-running agents. No retrieval step means no retrieval failures.

Our strengths

The only universal memory

Memory Synthesis

Multi-stage consolidation pipeline

Memories compress, associate, and evolve into new insights via 9 configurable strategies. No competitor equivalent.

Scheduled Synthesis

Automated consolidation

Schedule synthesis runs via API. Get digests of what your agents learned. No other memory system offers this.

8 Search Modes

Deepest retrieval pipeline

8 retrieval strategies where most competitors offer 1-3. Fewer missed memories.

Universal Memory

Works with everything, not just one tool

Consumer app + developer API from one platform. No code required, or integrate in 3 lines.

Pricing snapshot

What graph memory costs

Free tier included. Pro from $29/month. No per-query fees. Same accuracy, lower cost.

REM Labs Pro

$29/mo

Graph included. 50K recalls, 10K stores, Memory Synthesis, all 8 search modes.

Mem0 Pro

$249/mo

Graph memory included. 500K adds, 50K retrievals. SOC 2 + HIPAA.

Zep Flex

$25/mo

Full Graphiti engine. 20K credits. All temporal features at every tier.

OMEGA Pro

$29/mo

53 coordination tools. Core is free and open source (Apache 2.0).

Supermemory Pro

$29/mo

3M tokens. Consumer app, plugins, MCP server. All features included.

The bottom line

When to choose what

Choose REM Labs if you want:

One memory that works across ChatGPT, Claude, Obsidian, Slack, and 40+ tools
Memory that synthesizes and consolidates via API, not just stores and retrieves
Universal integration at every tier -- not locked behind enterprise pricing
Developer API with 40+ framework and tool integrations

Consider alternatives if you need:

Enterprise compliance now -- Mem0 or Zep have SOC 2 and HIPAA today; we do not
The largest ecosystem -- Mem0 has 21+ integrations and the biggest community
True local-first with zero API keys -- OMEGA runs entirely on-device with bundled embeddings
Maximum token efficiency -- Mastra's Observational Memory compresses 3-40x with no retrieval step
A TypeScript agent framework with built-in memory -- Mastra gives you the full framework, not just memory

Deep dives

1-on-1 comparisons

REM Labs vs. Mem0 REM Labs vs. Zep REM Labs vs. Supermemory Full benchmark report

The universal memory vs. the rest.

Choose REM Labs if you want:

Consider alternatives if you need:

One memory for every tool you use.