Free AI Memory APIs
Which AI memory APIs and frameworks a startup can give its AI agents and chatbots long-term memory with for free today, how many memories, tokens or requests the free plan covers, whether a card is needed and what the first paid plan costs, read from each provider's own page.
Free allowances read on each provider's own pages, all checked on or after . AI memory APIs change their free plans from time to time: confirm the terms on the provider's page before you rely on it.
AI memory APIs a startup can use for free today include Cognee (Free forever: 1 workspace, 1M tokens), Graphiti (Apache-2.0 open source, free to use), Zep (Start free with 10,000 credits a month), Mem0 Open Source (Open source (Apache-2.0), self-hosted), and Mem0 (50,000 adds a month with your LLM key). Each of the 10 free plans below links to the provider's page that states it, with its main limit, its memory or request caps, whether a card is needed and what the first paid plan costs.
An AI agent forgets everything between conversations unless you give it memory: the user's preferences, past decisions and facts it has learned. AI memory APIs store and retrieve those memories for you, several with a free plan, and open-source memory frameworks run free in your own stack.
The headline rarely tells you how far it goes. Free plans cap memories added, retrievals, tokens or monthly credits, may need your own LLM key, and keep projects or retention for paid plans. Each API below shows what is free, its main limit, its memory and request caps, whether a card is needed and what the first paid plan costs, quoted from the provider's own page with the date we read it.
Which APIs we picked and the order they appear in are our editorial choices; the terms are the providers'. Some of these providers pay us a referral commission when someone signs up through our link: those links are labeled, and they play no part in which APIs are listed or where.
Hosted AI memory APIs with a free plan
Add long-term memory to an agent with an API call, free to start.
- 1
Cognee
Agent memory with no card and 1M tokens free
Cognee's Free plan is free forever with 1 workspace and 1M tokens included, and no card is required. The first paid plan is usage-based at $1.00 per 1M tokens.
- Memories and requests
- 1M tokens included (source: cognee.ai)
- Payment card
- No card required (source: cognee.ai)
- First paid plan
- Standard: $1.00 per 1M tokens (source: cognee.ai)
- 2
Zep
Agent memory on a monthly credit allowance
Zep's Free plan starts with 10,000 credits a month, and those credits do not roll over. The first paid plan, Flex, is $125 a month.
- Memories and requests
- 10,000 credits a month, no rollover (source: getzep.com)
- First paid plan
- Flex: $125 a month, billed monthly (source: getzep.com)
- 3
Mem0
Memory for agents you run on your own LLM key
Mem0's Free plan gives 50,000 adds and 10,000 retrievals a month once you bring your own LLM key. Mem0 covers model calls only for the first 30 days, and paid plans start at $19 a month.
- Memories and requests
- First 30 days: 10,000 adds, 1,000 retrievals (source: mem0.ai)
- Payment card
- No credit card required (source: mem0.ai)
- First paid plan
- Paid plans from $19 a month (source: mem0.ai)
Start free at Mem0Terms read on mem0.ai on Mem0: the free allowance and how to start Mem0 Startup Program: what startups get - 4
Supermemory
Memory and RAG with credits that renew monthly
Supermemory's Free plan includes $5 of credits, renewed every month. Usage stops when they run out, and the first paid plan, Pro, is $19 a month.
- First paid plan
- Pro: $19 a month (source: supermemory.ai)
Start free at SupermemoryReferral linkTerms read on supermemory.ai on Supermemory: the free allowance and how to start Supermemory startup program: what startups get - 5
Letta
Stateful agents with a small free agent limit
Letta's free plan costs nothing and is limited to 3 stateful agents, with 5 MiB of storage per memory repository. The first paid plan, Pro, is $20 a month for personal use.
- Memories and requests
- 5 MiB of storage per memory repository (source: docs.letta.com)
- First paid plan
- Pro: $20 a month, for personal use (source: docs.letta.com)
Open-source AI memory frameworks
Run agent memory in your own stack, free.
- 1
Graphiti
Temporal knowledge graphs for agent memory
Graphiti is released under the Apache-2.0 license. You supply the graph database, LLM and embedder yourself.
- 2
Mem0 Open Source
Teams that want to self-host the memory layer
Mem0 Open Source is released under the Apache-2.0 license, and you own the stack, the data, and every component.
- 3
Letta Open Source
Developers self-hosting stateful agents
Letta's source code is released under the Apache-2.0 license.
Start free at LettaTerms read on github.com on Letta Open Source: the free allowance and how to start - 4
LangMem
Agents that learn from past conversations
LangMem's code is released under the MIT license, which permits use free of charge.
- 5
MemoryScope
An open-source memory framework for agents
MemoryScope is released under the Apache-2.0 license, so it is free to use.
Start free at ModelScopeTerms read on github.com on MemoryScope: the free allowance and how to start
AI startup programs
Programs from AI companies that give startups credits on paid usage.
Also useful for building with AI models
Referral links, picked for fit and ordered by fit (70%) and what a signup earns us (30%), at no cost to you. They never change this page's ranking.
How this comparison is built
The list covers AI memory APIs and frameworks a founder can use for free today without applying to a program. The order and the "best for" notes are our editorial reading of each API's terms. Every term comes from the API's own pricing or help page on the date shown, never from a third-party list; follow each link for the full conditions. A cap on memories, tokens or API calls a month, monthly credits instead of a plan, retention or projects kept for paid plans can matter more than the headline, so the comparison quotes them wherever the provider states them. Some of these APIs pay StartupPerks a referral commission, and their links are labeled as referral links; that decides neither whether nor where a API appears, and no API pays for a placement on this page.
Read the full methodologyCommon questions
What is the best free AI memory API?
By the terms each provider states, Mem0's free plan allows 50,000 adds a month with your own LLM key, Zep's free tier 10,000 credits a month, Supermemory's free plan $5 of credits renewed monthly, and Cognee's free plan 1 workspace with 1M tokens.
Is Mem0 free?
Mem0's free plan allows 50,000 adds a month with your own LLM key, and Mem0 pays for model calls for the first 30 days only, covering 10,000 adds and 1,000 retrievals. Mem0 Open Source is Apache-2.0 for self-hosting, and paid plans start at $19 a month.
Is there an open-source memory layer for AI agents?
Yes. Graphiti from Zep, Mem0 Open Source, Letta Open Source and MemoryScope are Apache-2.0 open source, and LangMem is MIT licensed.
Is Supermemory free?
Supermemory's free plan includes $5 of credits renewed every month, and usage stops when the credits run out. Pro is $19 a month.
More best-of guides
New startup perks, in your inbox
Get an email when a new credit, discount, or deal for founders is added. No spam, unsubscribe anytime.