Comparison · Python Library vs Managed API
LangMem vs Kronvex
No LangGraph Required
LangMem is a Python library built for LangGraph agents. Kronvex is a managed REST API that works with any stack — LangChain, AutoGen, Pydantic AI, or plain Python. EU-hosted, flat pricing, zero infra to manage.
TL;DR
Side-by-side in 30 seconds
| Feature / Question | LangMem | Kronvex |
|---|---|---|
| Type | Open-source Python library | Managed REST API |
| Framework requirement | LangGraph-first (tight integration) | ✓ Any framework or plain HTTP |
| Hosting | Self-managed or LangSmith cloud | ✓ Fully managed, EU Frankfurt |
| Pricing | Free self-host / LangSmith usage-based | Flat from €29/mo (Builder) |
| GDPR / EU hosting | ~ Depends on your infra | ✓ Built-in, Supabase Frankfurt |
| inject-context endpoint | ✗ Format prompts yourself | ✓ Returns ranked, ready context block |
| Confidence scoring | ~ Basic, no recency/frequency weighting | ✓ similarity × 0.6 + recency × 0.2 + frequency × 0.2 |
| Infra to manage | Yes (LangGraph state, storage backend) | ✓ None — fully managed |
| Python & Node SDK | ✓ Python only | ✓ Python + Node.js (pip & npm) |
Data accurate as of March 2026. Sources: langchain-ai/langmem (GitHub), kronvex.io/docs.
Honest comparison
Which one should you use?
You're already deep in LangGraph
- Your agents are built with LangGraph and you want native state integration
- You need tight control over memory storage backends (in-process, LangSmith)
- You're comfortable managing LangGraph infrastructure
- You want an open-source, self-hostable solution
- GDPR compliance is handled by your own infra team
You want managed memory for any stack
- You're not using LangGraph (AutoGen, CrewAI, Pydantic AI, plain Python…)
- You want zero infra to manage — just REST API calls
- You need EU data residency and GDPR compliance out of the box
- You want inject-context to build your system prompt automatically
- You want flat, predictable monthly pricing with no usage surprises
- You need multi-tenant isolation per customer agent
What Kronvex adds
Managed API vs Python library
Any framework, any language
LangMem is a Python library tightly coupled to LangGraph. Kronvex is a REST API — call it from Python, Node.js, Ruby, Go, or curl. It works alongside LangChain, AutoGen, CrewAI, Pydantic AI, LlamaIndex, or plain HTTP.
REST · Python · Node.js · any stackEU-native by default
Self-hosted LangMem means GDPR compliance is your problem. Kronvex stores all data in Supabase Frankfurt by default. Right to erasure, data export, and memory TTL are first-class API features — not afterthoughts.
Frankfurt · GDPR · right to erasureFlat, predictable pricing
LangSmith charges per trace, per token logged. Kronvex charges €29/mo for Builder (5 agents, 20,000 memories), €99 Startup (15 agents, 75k), €349 Business (50 agents, 500k) — flat monthly, no usage surprises.
€29/mo Builder · €99 Startup · €349 BusinessQuestions
Frequently asked
requests or the Python SDK.inject-context is a Kronvex endpoint that retrieves the most relevant memories and returns them pre-formatted as a system prompt block, ranked by similarity×0.6 + recency×0.2 + frequency×0.2. With LangMem you retrieve memories and must format them into your prompt yourself. inject-context collapses retrieval + ranking + formatting into a single call.DELETE /memories, per-agent TTL, and full data export from the dashboard. With self-hosted LangMem, data residency depends on where you deploy.Start with a free demo key
EU-hosted. No credit card. No LangGraph required. Your first memory in under 5 minutes.
Get your demo key →Demo key · 1 agent · 100 memories · No expiry