Best Supermemory Alternative? Unibase Memory vs Supermemory

Supermemory is a memory API: developers call it to build memory into their own products. Unibase Memory, which we build, is a Chrome extension that captures conversations across ChatGPT, Claude, Gemini, Grok, Kimi and DeepSeek into one searchable archive and puts the relevant part back into whichever one you are in, in one click.

Building something? Supermemory is a reasonable choice and we are not a substitute for it. Want the assistants you already use to stop forgetting? That is us, and an API is the wrong shape no matter how good it is.

That is the honest version. Two different questions hide under one search, and the rest of this page sorts out which one is yours.

What Supermemory actually is now

An API with a credit model. Every plan includes a monthly balance and calls draw it down at the same rates regardless of tier, with only unique content billed.

Free is zero dollars with five dollars of credits a month, the full search and memory API, and one team seat with unlimited end users. Pro is nineteen dollars a month with twenty dollars of credits and all the plugins, which includes Claude Code, Cursor and Hermes. Max is a hundred a month with a hundred and thirty in credits and a Gmail connector. Scale is three hundred and ninety nine a month with six hundred in credits, S3 and web crawler connectors, unlimited seats, SOC 2, a HIPAA BAA and a self hosted option. Enterprise is custom.

They publish operational numbers as well: over a hundred billion tokens a month and p95 recall under three hundred milliseconds.

Read that list and the audience is obvious. Team seats, connectors, compliance paperwork and a rate card are not features for someone who just wants Claude to remember last Tuesday.

If you are building something

Then the alternatives worth your time are the other memory APIs, and the comparison is about recall quality, latency, cost per unique item and whether you can self host.

Mem0, Zep, Letta, Cognee and Hindsight are the names that come up, and you will find real benchmark writeups comparing them. We are not one of those and we are not going to insert ourselves into that list, because a browser extension is not an API and pretending otherwise would waste your afternoon.

That is the whole of our advice for the first group. It is short because it is not our category.

If you are just using AI assistants

This is the group that arrives at Supermemory, reads the pricing page, and quietly backs out.

Your problem is not recall latency. It is that you explained your project to Claude in detail, then opened ChatGPT a week later and had to explain it again. Or that the conversation where you worked out why an approach would not work is somewhere in a sidebar with four hundred others.

That problem is solved by something that sits in the browser, watches the assistants you already use, and hands material back into them. Not by something you integrate.

We compared the main options in that category, including this one, in best AI memory extensions.

Side by side, for the second group

Shape. Supermemory is an API you call from code. Unibase Memory is an extension you install and then forget about.

What it captures. Supermemory stores what your application sends it. Unibase Memory captures conversations from six assistants as they happen, plus web pages you save, with no integration step.

Where the work happens. Supermemory expects you to build the retrieval and injection into your own product. Unibase Memory does the retrieval in a panel and the injection into the chat box you are already looking at.

Where your text lives. Supermemory runs on their infrastructure, with a self hosted option on the Scale plan. Unibase Memory keeps conversations in your browser by default, and anything you sync is locked on your device first, with a key only you hold. Everything exports as a file.

Cost model. Supermemory meters credits per call, from a free tier with five dollars of credits up to Scale at three hundred and ninety nine a month. Unibase Memory installs and works without an account.

Where Supermemory wins

If you are building, it wins on everything that matters for building, and this section is not a formality.

It is a real API with published latency numbers, which is more than most of this category offers. It has connectors for Gmail, S3 and web crawling, which cover sources a browser extension cannot reach. It carries SOC 2 and will sign a HIPAA BAA, which decides the question outright in regulated work. And it can be self hosted on the top plan, which matters if your data cannot leave your own infrastructure.

None of those four have an equivalent on our side, because none of them are problems a Chrome extension has.

Where Unibase Memory wins

Four things, and they only matter if you are in the second group.

Nothing to integrate. You install it and it is already capturing. There is no key to provision, no call to write, and no decision about what to store, which matters because the conversation that turns out to be important three weeks later is never the one you would have flagged at the time.

It covers the assistants you already use. ChatGPT, Claude, Gemini, Grok, Kimi and DeepSeek, in one archive, plus web pages you save. An API covers whatever your own product sends it, which is a different job and useless if you are not building a product.

It closes the loop. Finding the old exchange is half the work. Unibase Memory puts the selected messages into the input box of the chat you are looking at, and you edit them before submitting. Retrieval without that last step leaves you copying between tabs.

Your text stays with you. Conversations live in your browser by default, sync is optional, and anything you sync is locked on your device first, with a key only you hold. Everything exports as a file, so leaving costs you nothing.

The split is clean enough to state plainly. If your memory needs to live inside a product you are shipping, use an API and Supermemory is a reasonable one. If your memory needs to live across the assistants you personally use every day, an API is the wrong tool no matter how good it is, and that gap is what cross-AI memory means.

If you use several assistants daily, transferring AI memory between assistants is the version of the problem Unibase Memory was built for.