Hjarni vs mem0

mem0 provides an API, SDK, and hosted MCP server for persistent memory. Hjarni is a Markdown knowledge base people and their assistants maintain together.

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Quick answer

mem0 offers persistent memory through an API, SDK, and official hosted MCP server. It supports direct updates and can store text without extraction. Hjarni provides Markdown notes, folders, history, and shared team knowledge through its official hosted MCP server. Choose mem0 for memory operations inside applications or assistants. Choose Hjarni when you want a knowledge base you can write, review, and export as documents.

Checked 20 October 2026 against MCP tools and authentication, Direct Import, Update API, Memory export, Pricing. Plans and features can change.

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Hjarni and mem0 feature comparison
Feature	Hjarni	mem0
Primary shape Hjarni provides a writing surface. mem0 provides memory operations for applications and connected assistants.	Markdown notes in folders	Memory API, SDK, and MCP
MCP server Both offer hosted first-party servers. mem0 also publishes self-hosted OpenMemory.	Official, hosted (OAuth)	Official, hosted (OAuth or API key)
MCP actions mem0 is not limited to automatic capture or read-only retrieval.	Search, read, create, update	Search, list, read, add, update, delete
What gets stored mem0 defaults to memory extraction; Direct Import with infer=false skips deduction and saves supplied text.	Markdown as saved	Extracted facts or verbatim text
Human control People can inspect mem0 memories and update their text through the API or MCP. The product format differs from a folder of notes.	Markdown editor and history	Dashboard plus memory APIs
Portability mem0 documents filtered memory retrieval and schema-based export. Hjarni exports active notes as Markdown; revisions and folder instructions are separate.	Active notes and attachments as a ZIP	Memory APIs and structured export
Self-hosting Choose the deployment model separately from the memory format.	Hosted service	Open-source core and OpenMemory
Folder instructions Hjarni instructions guide behavior; they do not guarantee retrieval or enforce access boundaries.	Folder guidance for connected AI	Memory configuration and filters
Free allowance mem0 counts requests, not 10,000 stored memories. Its Hobby plan includes one project.	25 personal notes	10,000 adds and 1,000 retrievals/month
History Compare the review and restore workflow you need, rather than treating mem0 memories as immutable.	Note versions and one-click restore	Memory history API
Best fit	Notes and shared documentation	Programmatic memory and extraction

Details behind the comparison

Primary shape: Hjarni provides a writing surface. mem0 provides memory operations for applications and connected assistants.
MCP server: Both offer hosted first-party servers. mem0 also publishes self-hosted OpenMemory.
MCP actions: mem0 is not limited to automatic capture or read-only retrieval.
What gets stored: mem0 defaults to memory extraction; Direct Import with infer=false skips deduction and saves supplied text.
Human control: People can inspect mem0 memories and update their text through the API or MCP. The product format differs from a folder of notes.
Portability: mem0 documents filtered memory retrieval and schema-based export. Hjarni exports active notes as Markdown; revisions and folder instructions are separate.
Self-hosting: Choose the deployment model separately from the memory format.
Folder instructions: Hjarni instructions guide behavior; they do not guarantee retrieval or enforce access boundaries.
Free allowance: mem0 counts requests, not 10,000 stored memories. Its Hobby plan includes one project.
History: Compare the review and restore workflow you need, rather than treating mem0 memories as immutable.

Hjarni has its own native apps. Free on every plan for iPhone, iPad and Mac and Android. Same account, same notes as the web. An internet connection is required.

Two ways to organize persistent context

mem0 organizes memory around identities, filters, and memory operations. Hjarni organizes knowledge as titled Markdown notes in folders. Both can be written by an assistant, and neither requires the human to give up control of the content.

Extraction is a choice

mem0's default write path extracts memories from the input. Its Direct Import option bypasses that step with infer=false. The useful comparison is whether you want extracted facts or a document you maintain as a whole, rather than whether one service preserves words and the other cannot.

Editing and leaving

mem0 exposes update, delete, history, and export capabilities. Hjarni combines a Markdown editor with note versions and one-click restore, then exports active notes and attachments as a ZIP. Its standard export does not include revisions or folder instructions.

Cost and fit

mem0's free Hobby allowance is 10,000 add requests and 1,000 retrieval requests per month; Starter is $19/month. Hjarni has note quotas and flat subscription plans, with no first-party charge per assistant request. Your assistant subscription or provider usage is separate. Test saving, updating, and retrieval with your own examples in either product.

When to use mem0

You need a memory API or SDK in your application
You want configurable fact extraction or direct text import
You prefer an open-source memory stack you can operate

When to use Hjarni

You want Markdown documents in folders
You want people and assistants to maintain the same knowledge base
You want a note editor, revision history, and Markdown export

mem0 provides memory operations. Hjarni provides a shared home for your notes.

Give your AI a memory

Common questions

What is mem0?

Memory infrastructure with managed and open-source options, hosted MCP and APIs. People and agents can update, delete and export stored memories. See official documentation.

Does mem0 always extract or rewrite saved text?

No. Direct Import with infer=false stores text verbatim. Its regular write workflow instead extracts memories from the input, so the stored content depends on the operation you choose.

Does mem0 work with Claude and ChatGPT?

Its official hosted MCP supports OAuth or API-key authentication and read/add/update/delete tools for compatible clients. Open-source or local variants are separate deployment choices.

How do the free limits work?

Current managed-plan limits meter add and retrieval requests, not simply the number of memories stored. Read the current pricing page before estimating capacity or cost.

When should I pick Hjarni instead?

Hjarni supplies a Markdown notes app with folders, sharing, attributed history and scoped manual agent tokens. Compare the workflow you want to maintain; mem0 also supports explicit raw text and editing.

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5 out of 5 from 14 reviews 14,400+ notes a day read or updated by AI

Works with Claude, ChatGPT, Cursor and any MCP client.