EU-hosted and GDPR-native by default. pgvector cosine similarity, confidence scoring, no infrastructure to manage. Your first memory in under 5 minutes.
The problem with alternatives
Zep shut down their free community edition. Cloud pricing starts at $475/mo for serious usage — and your data stays in the US with no EU residency option.
Mem0 routes every memory write through an LLM, costing ~$0.002 per write. At 100K writes/month that's $200 just for storage operations — before your actual AI usage. Requires an OpenAI key even locally.
pgvector + Redis + custom embedding pipeline + confidence scoring = 2–3 weeks of setup. Then you own the infrastructure forever: upgrades, backups, scaling, monitoring.
Feature comparison
| Feature | ★ BestKronvex | Mem0 | Zep | MemGPT | Pinecone |
|---|---|---|---|---|---|
| Managed API (no infra) | ✓ | ✓ | ✓ | ✗ | ✓ |
| EU hosting (GDPR native) | ✓ | ✗ | ✗ | ✗ | ✗ |
| Semantic search (pgvector cosine) | ✓ | ✓ | ✓ | ✓ | ✓ |
| Confidence scoring (recency + frequency) | ✓ | ✗ | ✓ | ✓ | ✗ |
| Multi-agent support | ✓ | ✓ | ✓ | ✓ | ✗ |
| REST API (language-agnostic) | ✓ | ✓ | ✓ | ✗ | ✓ |
| Python SDK Live | ✓ | ✓ | ✓ | ✓ | ✓ |
| Node.js SDK Live | ✓ | ✓ | ✓ | ✗ | ✓ |
| n8nNative | ✓ | ✗ | ✗ | ✗ | ✗ |
| Pricing from | €29/mo | From $29/mo | From $0 (OSS) | OSS / $20/mo | Pay-per-use |
| Free tier | Demo key · 100 memories | ✓ | ✓ | ✓ | ✓ |
| inject-context endpoint | ✓ | ✗ | ✗ | ✗ | ✗ |
| Graph memory | ✓ Native — GET /graph | ~ | ~ | ✗ | ✗ |
Data accurate as of March 2026. Sources: mem0.ai, getzep.com, letta.ai, pinecone.io, supabase.com.
Deep dives
Why Kronvex
All data stored in Supabase Frankfurt. GDPR compliance is not an add-on — it is the default. Right to erasure, memory TTL, and data export are first-class API features, not afterthoughts.
EU · GDPR · FrankfurtRecall ranks memories using a composite score: similarity × 0.6 + recency × 0.2 + frequency × 0.2. Recency uses a sigmoid with a 30-day inflection. Frequency is log-scaled. No black-box LLM reranking.
Pure REST API — call it from Python, Node.js, Go, Rust, or any HTTP client. Official SDKs for Python and Node. Works with LangChain, CrewAI, n8n, and any custom agent framework out of the box.
REST · Python SDK · Node SDKPricing
Kronvex
€29
/month · Builder
5 agents · 20,000 memories · EU-hosted · GDPR-native · pgvector recall · Python & Node SDKs
Start FreeZep Cloud
$475
/month · Flex+
US-only data residency. Deprecated their free self-hosted tier. Prices went up after community edition shutdown.
Mem0
$29+
From $0 · Free tier available
Free tier available. Paid plans from ~$29/mo. LLM costs at every write add up fast — not included in any quoted plan price.
Kronvex Builder is typically 25× cheaper than equivalent Zep Cloud plans — for the same core functionality, EU-hosted.
Migration
BEFORE (Zep)# Install: pip install zep-python from zep_python import ZepClient from zep_python.memory import Memory, Message client = ZepClient(api_key="z-...", base_url="https://api.getzep.com") # Add memory (creates session, builds graph, calls LLM internally) client.memory.add( session_id="user-123", memory=Memory(messages=[Message(role="user", content="user prefers dark mode")]) )
AFTER (Kronvex) — EU-hosted, no LLM at write# Install: pip install kronvex from kronvex import Kronvex client = Kronvex(api_key="kv-...") # One line setup # Remember — pgvector embedding, no extra LLM calls await client.agent("user-123").remember("user prefers dark mode") # Recall — cosine similarity + confidence scoring memories = await client.agent("user-123").recall("display preferences") # That's it. 3× simpler. EU-hosted. GDPR-native.
Questions
confidence = similarity × 0.6 + recency × 0.2 + frequency × 0.2. There is no LLM in the retrieval path, which means recall is fast (~50ms), predictable in cost, and doesn't require an OpenAI key to operate.
DELETE /memories, memory TTL configuration, and full data export. Read our in-depth article on building GDPR-compliant AI agents for technical details.
EU-hosted. No credit card. Your first memory in under 5 minutes.
Demo key · 1 agent · 100 memories · No expiry
100 free memories. No credit card required.
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