Best AI Memory Extensions in 2026: Where Your Chats End Up

Most lists in this category skip the question that actually decides it. Once you install one of these, where does the text of your conversations sit?

For four of the six here, it sits on a server belonging to the company that made the extension. For two, it stays on your machine. Nothing else in this comparison changes what you are willing to paste into a chat as much as that does.

What this list covers and what it leaves out

Search this and half the results are memory frameworks for coding agents. Zep, Letta, Cognee, LangMem. Those are real products, but you install them with a package manager and use them from an IDE.

This list is browser extensions only, for people whose AI work happens in a chat window.

Why people look for an AI memory extension

Three situations account for almost all of it.

You use more than one assistant. What ChatGPT knows about your project is invisible to Claude, and there is no setting inside either one that fixes it.

A thread got too long and the useful part is buried behind three hundred messages you are not going to scroll.

You switched tools and had to rebuild months of context by hand.

Built-in memory does not solve any of these, because it was designed to make one product feel personal, not to let your work leave it.

At a Glance: the six compared

Verified from each vendor's own pricing and product pages, August 2026.

Disclosure: Unibase Memory is ours. Figures above come from each vendor's own pricing and product pages and were checked in August 2026. Prices change, so check before you buy.

The pattern worth noticing: five of the six are metered or paid. Free tiers here mean 200 credits a day, or 50 saved items, or five dollars of usage. One has no free tier at all.

Unibase Memory

Best for: several assistants, with capture that just happens.

Open ChatGPT, Claude, Gemini, Grok, Kimi or DeepSeek and it is already saving. There is no button to remember and no folder to maintain, which matters more than it sounds. The context you need in three weeks is almost never the one you thought to save today.

Everything stays in your browser. Sync is optional, and anything you sync is encrypted on your device first using Fernet, which is AES-128-CBC with HMAC-SHA256. The key never leaves your browser. That also means we cannot recover your data if you lose it, and we think that is the right trade. Export everything as a file whenever you want.

Nothing is counted. No credits per day, no cap on saved items, and no paid tier waiting for you once you start relying on it. Add to Chrome, then sign in with Google, email or X.

Where it loses: MemoryPlugin covers three times as many tools. myNeutron takes in Gmail, Drive and Slack, and we do not. We are not open source.

OpenMemory by Mem0

Best for: people who will actually self-host.

Open source and self-hosted, which is the strongest privacy position on this list, because nobody else is holding anything.

The honest note is that it has moved. The product now leads with Cursor, Windsurf, VS Code and MCP. A Chrome extension still exists on GitHub, but it is not the thing being built any more. Skip it if installing from the Chrome Web Store is where your appetite ends.

Supermemory

Best for: building an application, not using a chat.

The biggest name in this category, and the one most likely to be the wrong answer for a reader of this list. The pricing page tells you why: a free tier with about five dollars of usage credits, then $19, $100 and $399 a month billed against consumption. The integrations are MCP, Claude Code and similar.

That is infrastructure for people shipping products that need memory. If you just want your chats to carry over, you would be paying for an API you are never going to call.

AI Context Flow

Best for: reusable briefs you write yourself.

A different model from ours, and worth understanding before you compare prices. You write context blocks, called buckets, and pull them into any tool. Project briefs, brand guidelines, client requirements.

ChatGPT, Claude, Gemini, Grok and Perplexity, plus anything MCP compatible. Encryption runs inside trusted execution environments, so the claim is that they cannot read your context even internally. That is a stronger technical claim than most tools here make.

Free is 200 credits a day and 50 MB. Plus is $99 a year, Pro is $199. Skip it if the thing you want back is a decision from three weeks ago, because a bucket only holds what you typed into it.

myNeutron

Best for: research and documents rather than chats.

Closer to a second brain. You save things as Seeds and group them into Bundles, and it takes in far more than AI conversations: web pages, PDFs, Gmail threads, Drive files, Slack conversations, screenshots and notes. The input range is genuinely wider than anything else here.

The tradeoff is that saving is something you do, not something that happens. Free is 50 Seeds, which goes fast if you are saving conversations rather than documents. Basic is $4.99 a month billed annually, Pro is $14.99.

MemoryPlugin

Best for: the widest coverage, if you can pay for it.

21+ tools, including Perplexity, Mistral, TypingMind, Claude Code, Codex and Cursor. Nothing else here is close. If you use assistants nobody else supports, this is the one that supports them.

There is no free tier, only a 7 day trial. Core is $89 a year and keeps your last 500 conversations. Pro is $180 for unlimited history. Your text lives on their servers, encrypted in transit and at rest, which means they hold the key rather than you.

How to choose, in one line each

You want capture to just happen, across several AIs: Unibase Memory.

You will run your own server and want open source: Mem0.

You need Perplexity, Mistral or TypingMind covered: MemoryPlugin.

You save documents more than conversations: myNeutron.

You retype the same brief constantly: AI Context Flow.

You are building an app: Supermemory.

Before you install any of them

Every extension here can read what is on the page, including ours. That is what makes the category work and what makes it worth checking. The five checks are here: are AI memory extensions safe.