Quick Comparison: 7 Long-Term Memory AI Tools
Here's how the top 7 AI tools with long-term memory stack up before we dive into the details:
| Tool | Memory Type | Best For | Starting Price |
|---|---|---|---|
| Noumi | Persistent, cross-project | Knowledge workers, multi-project management | $20/month |
| ChatGPT with Memory | Limited (~1,200 words) | Casual use, basic preferences | Free / $20/mo |
| Notion AI | Workspace-scoped | Teams using Notion | $20/user/mo |
| Mem | Note-based knowledge base | Personal knowledge management | $12/month |
| Claude with Projects | Session-based (200K tokens) | Large document processing | Free / $20/mo |
| Limitless | Meeting/conversation capture | Meeting-heavy professionals | Free (Pendant req.) |
| Personal AI | Custom-trained on your data | Creators, consultants | Free / paid plans |
1. Noumi — Best for Persistent Memory Across Projects & Autonomous Execution
Noumi is an autonomous AI personal assistant built specifically for knowledge workers who need an AI that remembers everything and works independently. Unlike chat-based tools that reset between sessions, Noumi maintains complete context across all your projects through a structured workspace system.
The core difference: Noumi organizes work into Projects and Topics, each with its own persistent memory layer. When you're working on a client project in March and return to it in May, Noumi remembers every conversation, every file, every decision. It doesn't just store facts — it understands the full context of your work and applies that understanding automatically.
Noumi also learns from your workflows. If you consistently format reports a certain way or always need specific data points in your analysis, Noumi picks up on these patterns and applies them without being reminded. This self-evolving capability means the AI gets more useful the longer you work with it.
Key Features
- Persistent memory system that retains full project context across weeks and months
- Autonomous task execution — completes multi-step work independently without constant prompting
- Self-evolving skills that learn your workflows and build custom capabilities over time
- Intelligent file search that surfaces relevant documents from your workspace automatically
- Intent alignment that understands what you actually need, not just what you literally said
Pricing
- Starter: $20/month (free for 1 month) — 1,200 points/month, Claude Sonnet model
- Pro: $100/month — 6,000 points/month, Claude Sonnet + Opus models, unlimited memory
- Team: Custom pricing — shared workspace, team memory, admin dashboard
- Visit noumi.ai/pricing for current plan details
Best For
- Product managers tracking roadmaps and feature decisions across quarters
- Knowledge workers managing multiple long-term projects simultaneously
- Teams who need an AI that learns their specific workflows and standards
2. ChatGPT with Memory — Best for Casual Use with Basic Memory
ChatGPT added memory features in 2024 and expanded them significantly in April 2025 to reference full chat history. The system now maintains two types of memory: explicitly saved facts and insights gathered from past conversations.
However, ChatGPT's memory has significant limitations. According to OpenAI's documentation, the system can store approximately 1,200–1,400 words total. Once memory is full, ChatGPT stops adding new memories unless you manually delete old ones. This makes it unsuitable for complex, long-running professional projects where context accumulates over time.
Key Features
- Saved memories for explicit facts you want ChatGPT to remember
- Chat history reference that pulls context from past conversations
- Project-based memory isolation (memories don't cross between Projects and main chat)
- Temporary chat mode for conversations you don't want remembered
Pricing
- Free tier with limited memory capabilities
- ChatGPT Plus: $20/month with full memory access
- ChatGPT Pro: $200/month for advanced features
Best For
- Casual users who want basic preference memory
- Short-term projects that don't accumulate much context
- Users comfortable manually managing memory limits
3. Notion AI — Best for Teams Already Using Notion
Notion AI is deeply integrated into Notion's workspace, making it powerful for teams already using Notion for documentation and project management. The AI can reference any content in your Notion workspace, effectively giving it memory of everything you've documented.
As of May 2025, Notion AI is no longer a standalone add-on — full AI access is now bundled into the Business plan at $20/user/month. The limitation: Notion AI's memory is confined to what's in your Notion workspace. If your work lives across multiple tools, Notion AI won't have access to that context unless you manually copy it in.
Key Features
- Full access to all content in your Notion workspace
- Custom AI agents that run on schedules and triggers (as of February 2026)
- AI Autofill for databases, making data enrichment automatic
- Skills system that lets you teach the AI custom capabilities
Pricing
- Free and Plus plans: Limited complimentary AI responses
- Business plan: $20/user/month with full AI access
- Enterprise: Custom pricing
Best For
- Teams already using Notion as their primary workspace
- Organizations that keep most documentation in Notion
- Users who want AI integrated directly into their project management tool
4. Mem — Best for Personal Knowledge Management
Mem positions itself as an AI-powered personal knowledge base with context-aware recall and bi-directional linking. It's designed for individuals who want to dump ideas, meeting notes, and research into one place and have the AI organize and surface it automatically.
Mem excels at connecting related ideas and surfacing relevant past notes when you're working on something new. However, it's primarily a note-taking and knowledge management tool, not a general-purpose AI assistant. It won't execute tasks or integrate with external tools the way more comprehensive AI assistants do.
Key Features
- AI-assisted summaries and context-aware recall
- Bi-directional linking between related notes
- Unlimited notes and chat messages on paid plan
- Dark mode and unlimited collections
Pricing
- Free tier with basic features
- Pro: $12/month with unlimited access and advanced AI features
Best For
- Individuals building a personal knowledge base
- Researchers who need to connect ideas across many notes
- Users who prioritize note-taking over task execution
5. Claude with Projects — Best for Large Context Windows
Claude by Anthropic offers Projects, which function as persistent workspaces where you can upload files, set custom instructions, and maintain context across multiple conversations within that project.
Claude's strength is its massive context window — up to 200,000 tokens, roughly 150,000 words or about 500 pages of text. This means you can upload extensive documentation and Claude will reference it throughout your conversation. However, this is session-based context, not true long-term memory. Once you close the chat, that context doesn't automatically carry forward to future sessions unless you re-upload the files.
Key Features
- 200K token context window for handling large documents
- Projects that maintain files and custom instructions
- Strong reasoning and writing capabilities
- Artifact generation for code and documents
Pricing
- Free tier with limited usage
- Claude Pro: $20/month with higher usage limits and priority access
Best For
- Users who need to work with very large documents in a single session
- Writers and researchers who value strong reasoning capabilities
- Teams comfortable re-establishing context at the start of each session
6. Limitless — Best for Meeting and Conversation Recall
Limitless (formerly Rewind AI) takes a different approach to memory: it records everything you see and hear, then makes it searchable. The company pivoted to focus on the Limitless Pendant, a wearable device that captures meetings and conversations in real time.
This is useful for professionals who spend most of their time in meetings and want perfect recall of what was discussed. However, it's not a general-purpose AI assistant — it's a memory capture tool that you query when you need to remember something specific from a conversation.
Key Features
- Wearable Pendant that records meetings and conversations
- Searchable archive of everything you've said and heard
- Meeting summaries and action item extraction
- Private, on-device processing for privacy
Pricing
- Unlimited Plan now free for existing users
- Pendant hardware purchase required for full functionality
Best For
- Executives and consultants who spend most of their time in meetings
- Users who need perfect recall of verbal conversations
- Privacy-conscious professionals who want on-device processing
7. Personal AI — Best for Training a Custom AI on Your Voice
Personal AI lets you train a custom AI assistant on your own writing, speaking style, and knowledge. The more you interact with it, the more it sounds like you and remembers your specific expertise.
Personal AI requires significant upfront training data to be effective, making it higher-effort than plug-and-play alternatives. However, for professionals who want an AI that truly represents their personal knowledge and communication style, the investment can be worthwhile.
Key Features
- Custom training on your writing and speaking style
- Personal memory stack that grows with every interaction
- Voice-based interaction for natural communication
- API access for integrating your Personal AI into other tools
Pricing
- Free tier with limited memory capacity
- Paid plans for expanded memory and features (pricing varies)
Best For
- Creators and consultants who want to scale their expertise
- Professionals with a distinct communication style they want to preserve
- Users willing to invest time in training a custom AI
Common Misconceptions About Long-Term Memory AI
Assuming all AI assistants remember context the same way. Most AI tools use session-based context windows, not true persistent memory. A large context window is useful within a single conversation but doesn't carry forward to future sessions. True long-term memory means the AI remembers across days, weeks, and months without you re-uploading files or re-explaining context.
Believing memory features are the same as learning capabilities. Some AI tools remember facts you explicitly tell them to save, but they don't learn from your workflows or adapt their behavior over time. Self-evolving systems go beyond storage — they recognize patterns in how you work and automatically apply those patterns to future tasks.
Thinking more memory storage always means better performance. Memory capacity matters less than memory structure. An AI that stores 10,000 random facts is less useful than one that organizes context by project, understands relationships between information, and surfaces the right context at the right time.
Expecting AI memory to work like human memory. AI memory is more reliable in some ways (perfect recall of exact wording) but less sophisticated in others (understanding nuance and context). The best long-term memory AI tools combine reliable storage with intelligent retrieval.
Frequently Asked Questions
Getting Started
The best way to evaluate whether a long-term memory AI actually works for your use case is to test it with real ongoing work. Give the tool a specific project detail — a product name, a stakeholder preference, a decision you made — then close the conversation and return the next day. Ask the AI to recall it unprompted. If it can, the memory is working. If it asks you to re-explain, the tool is storing general facts but not structured context.
For most knowledge workers managing projects that span weeks or months, the difference between session-based AI and true long-term memory comes down to whether you're constantly rebuilding context or building on it. Session-based tools are powerful in the moment but exhausting over time. Long-term memory AI gets more useful the longer you work with it.
If you're tired of re-uploading files, re-explaining your projects, and starting from scratch every time you open a new chat, try working with an AI assistant that actually remembers. Try Noumi →
