Yes — you can study with Quizlar without ever leaving Claude or ChatGPT. Quizlar runs a hosted Model Context Protocol (MCP) server, so once you connect it, you can say "quiz me on photosynthesis" right inside the chat and your AI assistant builds a deck, runs a spaced-repetition quiz, grades your typed answers, and tracks what you're forgetting — all through the same conversation.
This page explains what the integration does, the exact tools your assistant gets, which clients support it, how to connect it in about two minutes, and how it stays private — with a full worked example and troubleshooting steps.
— Sangura, founder of Quizlar. I use Claude and ChatGPT constantly to understand things — I built the layer that tests you on them and remembers what you forgot.
I use Claude and ChatGPT constantly to understand something fast — but notice what they do: they explain. Ask one to “quiz me” and the session vanishes when you close the tab. Nothing is scheduled, nothing comes back when you’re about to forget it, and you’re still the one deciding what becomes practice. Explanation isn’t retention; the reps have to live somewhere.
I build Quizlar solo — I started it in December 2025, once agentic coding tools got good enough to build the learning tool I’d always wanted. My rule for it is simple: learning is a mental gym, so the app can rack the weights, but you still have to lift. Any tool that quietly hands you back its own job — making the cards, grading yourself, staring at a screen — is a tool you’ll quit. That’s the one thing Quizlar won’t do.
MCP is an open standard that lets AI assistants call external tools. Quizlar publishes an MCP server at https://mcp.quizlar.app/mcp/ that exposes your decks, quizzes, and FSRS spaced-repetition data as 22 tools your assistant can use on your behalf.
Practically, that means your chat assistant becomes a study coach with memory: it can turn a paragraph, a YouTube video, or your own notes into flashcards, quiz you with active recall, and tell you what's due for review next time — using your real progress, not a guess.
You never call these by name — you ask in plain language and the assistant picks the right tool. But knowing the surface area shows what's possible. The 22 tools fall into four groups:
| Group | What it does | Example tools |
|---|---|---|
| Build decks | Turn text, notes, or a YouTube video into flashcards | create deck from text, create deck from YouTube, batch-create cards |
| Run quizzes | Start a quiz, submit or skip answers, end the session | quiz me, start quiz, submit answer, skip question, end quiz |
| Find & browse | Search and open your existing decks and cards | list decks, search decks, list cards, search cards |
| Track & analyze | Surface what's due, what you're forgetting, and how fast you're improving — all from FSRS | get progress, study recommendations, knowledge gaps, learning velocity, retention curves |
The analytics group is the part a chat tool can't fake: FSRS records every answer and predicts the moment you're about to forget each item, so "what should I review today?" returns a real schedule, not a guess.
Any MCP-compatible client can connect. The common ones:
| Client | How to connect | Auth |
|---|---|---|
| Claude.ai (web) | Settings → Connectors → Add custom connector | One-click OAuth sign-in |
| Claude Desktop | Add https://mcp.quizlar.app/mcp-apikey/ as a remote MCP server | API key (Bearer) |
| ChatGPT | Settings → Connectors (developer/custom connector) | API key (Bearer) |
| Cursor / Cline | Add MCP server in settings | API key (Bearer) |
Because the server is remote and hosted, there's nothing to install or run locally — you point the client at the URL and authenticate.
Both get the identical 22 tools — the difference is only how you authenticate and where it fits your workflow.
sk-qz-). You generate it once in Quizlar and paste it into the connector. Custom connectors in ChatGPT may require developer mode and a paid plan.One thing to note: the chat itself is text. Spoken, hands-free voice quizzing lives in the Quizlar mobile and web apps — but because everything syncs, you can build a deck in the chat and then finish it out loud on your phone.
https://mcp.quizlar.app/mcp/, and complete the one-click sign-in. No API key needed.claude_desktop_config.json, run npx -y mcp-remote https://mcp.quizlar.app/mcp-apikey/ --header "Authorization:Bearer sk-qz-…". Desktop can time out mid sign-in, so the key path is the reliable one there.sk-qz-), add https://mcp.quizlar.app/mcp/ as a remote MCP server, and set the header Authorization: Bearer sk-qz-….You drive everything in plain language. A few examples:
The same decks and progress sync with the Quizlar web and mobile apps, so you can start a deck in Claude and finish a voice quiz on your phone.
Here's a typical exchange once the connector is live:
You never opened a separate app, made a single flashcard by hand, or decided when to review — the assistant and FSRS did both.
The connector authenticates as you, so the assistant can only read and write your own Quizlar account — your decks, quizzes, and progress. It never receives your password, and OAuth connections never expose a long-lived key to the model.
You stay in control: revoke access any time by removing the connector (Claude) or rotating the sk-qz- API key in Quizlar Settings (ChatGPT, Cursor, Cline). Usage follows the same plan limits and privacy policy as the rest of Quizlar.
https://mcp.quizlar.app/mcp/ with the trailing slash — then confirm the connector is enabled and, for Claude.ai, that you completed the OAuth sign-in.sk-qz- key in Settings and make sure the header reads Authorization: Bearer sk-qz-….The friction in spaced repetition is rarely the reviewing — it's the setup. Making cards is tedious, so people skip it. When your assistant can turn whatever you're already discussing into a deck in one sentence, the cards get made. And because Quizlar uses the FSRS algorithm under the hood, the assistant always knows the right time to test you on each item — the part chat tools can't do on their own.
Yes. Quizlar runs a hosted MCP server, so once you connect it you can say 'quiz me on X' directly in Claude or ChatGPT and the assistant builds a deck, runs a spaced-repetition quiz, grades your answers, and tracks your progress — without leaving the chat.
In Claude.ai (web), open Settings → Connectors → Add custom connector, paste https://mcp.quizlar.app/mcp/, and complete the one-click sign-in — no API key needed. Claude Desktop is different: point it at https://mcp.quizlar.app/mcp-apikey/ with an Authorization: Bearer sk-qz-… header, because Desktop can time out mid sign-in.
Generate an API key in Quizlar (Settings → API keys; keys start with sk-qz-), then add https://mcp.quizlar.app/mcp/ as a custom/remote MCP connector in ChatGPT with the header Authorization: Bearer sk-qz-….
A plain chatbot forgets you between sessions. Quizlar gives the assistant persistent memory via the FSRS algorithm: it stores every answer, schedules each card for the moment you're about to forget it, and surfaces exactly what's due next time — so reviews are spaced for retention, not random.
Only your own data — your decks, quizzes, and progress. The connector authenticates as you, never receives your password, and OAuth never hands a long-lived key to the model. Revoke access any time by removing the connector or rotating your sk-qz- API key in Settings.
No. Quizlar's MCP server is remote and hosted, so there is nothing to download or run locally. You point your assistant at the URL and authenticate.
Yes. Decks and FSRS progress are shared across the MCP integration, the web app, and the mobile app, so you can build a deck in Claude and finish a voice quiz on your phone.
You can connect and use the integration with a free Quizlar account. Usage follows the same plan limits as the rest of Quizlar.