
ChainMemory
Memori
Mem0
Agentmemory
TheSecondBrain.dev
cognee
VATES.jp
A personal memory layer for your AI tools, connected over MCP.
Quizlet
Anki
NotebookLM
Turn your own PDFs and notes into multiple-choice practice tests. Take timed mock exams, retry what you missed, and see the source passage when a question has one.

Which is more popular?
Website, pricing, platforms and company facts side by side.
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OT
OppTests
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|---|---|---|
| Website | tempreon.com | opptests.com |
| Pricing | — | |
| Platforms | — | |
| Company | Startup from the United States · 2026 | Startup from Spain · 1 - 9 employees |
| Listed in |
In their own words, as submitted to SaaSHub.

Tempreon is a personal memory layer for your AI tools, connected over MCP. Your knowledge, preferences, and decisions travel across Claude, ChatGPT, Cursor, and any MCP-capable client — captured once, available everywhere. It learns how you actually work instead of just storing what you said.
OppTests turns the material you're already studying, such as PDFs and other supported documents, into multiple-choice practice tests. How it works Upload a file, choose the material and how many questions you want, and take the test. What's different View source: when a question has a reference,...
What each product offers, as listed by its team.

No features have been listed yet.
How often each product is chosen within a category, 0–100% relative to the other.

As answered by people managing Tempreon and OppTests.
Tempreon's answer
Tempreon started with a simple observation: AI models keep changing, but the thing that makes them useful to you — your context, your preferences, your judgment — gets rebuilt from scratch inside every tool, and lost every time you move.
We built the layer that fixes that: person-owned memory served over the open Model Context Protocol, so it works across assistants instead of belonging to one. Along the way we open-sourced the pieces that are useful to everyone regardless of whether they use Tempreon — like memhaul, our MIT-licensed CLI for turning ChatGPT and Claude data exports into files you own.
The through-line is custody: the model is temporary, your memory shouldn't be.
Tempreon's answer
Most alternatives in this space are memory infrastructure for developers building their own AI apps. If you're the person using several AI tools every day, that's not your problem — your problem is re-explaining yourself to each of them and losing everything when you switch.
The choice is really about who the memory is for. Ours is for you.
Tempreon's answer
Tempreon is built for the person, not the app. Most memory products are developer APIs for adding memory to a single product; Tempreon is a memory layer you own that travels with you across every AI tool you use — Claude, ChatGPT, Cursor, anything MCP-capable.
Tempreon's answer
Individuals who live in AI tools all day: operators, consultants, founders, sales professionals, and knowledge workers who use more than one assistant and are tired of being a stranger to each of them.
If you've ever pasted the same context into Claude and ChatGPT in the same week — you're the audience.
Tempreon's answer
The protocol choice is the product decision: build on the open standard, and your memory works everywhere the standard does.
Share your experience with using Tempreon and OppTests. For example, how are they different and which one is better?
When comparing Tempreon and OppTests, you can also consider the following products.

Portable, verifiable memory for AI agents — works across ChatGPT, Claude, Gemini and any MCP client
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Quizlet allows you to review and create flashcards for a variety of subjects, such as math and reading.
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Persistent memory from agent trace, not just conversation
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Anki is a program which makes remembering things easy. Because it's a lot more efficient than traditional study methods, you can either greatly decrease your time spent studying, or greatly increase the amount you learn.
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AI-first notebook by Google, available in the U.S., blends large language models and user-chosen data. Apply for access to explore intelligent insights and enhance your note-taking experience.
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