Quizlar — voice-powered AI flashcards with spaced repetition

Name: Quizlar — voice-powered AI flashcards with spaced repetition
Author: quizlar

by quizlarversion 1.0.0i★ –iRuns in the cloud

Registry nameio.github.quizlar/mcp-server

Install

Overview

Description from the maker (original English)

Voice-led, FSRS-scheduled flashcards from YouTube, PDFs, web, or text. Auto-graded quizzes.

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
UsageiNot measured yet★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs in the cloud
Transport: Streamable HTTP
Category: Marketing & social media
You need to fill in: Authorization

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 1 of 1 passed
Runs on the maker’s server: what you ask it goes through their server.
You fill in yourself: Authorization

Values marked secret are keys to your account. Never share them or paste them into a chat.

You need

Runs in the cloudNothing to install; it connects over the internet

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

This address needs a key in a request header, which the add-connector menu cannot set. Use Claude Code, Cursor or VS Code instead.

Run this in your terminal

claude mcp add --transport http quizlar https://mcp.quizlar.app/mcp/ --header 'Authorization: your-value'

Fill in the empty values before running it.

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "quizlar": {
      "url": "https://mcp.quizlar.app/mcp/",
      "headers": {
        "Authorization": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "quizlar": {
      "type": "http",
      "url": "https://mcp.quizlar.app/mcp/",
      "headers": {
        "Authorization": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

This address needs a key in a request header, which the add-connector menu cannot set. Use Claude Code, Cursor or VS Code instead.

Your choice stays on this device in a cookie; no account needed.

Values you fill in

Authorization secret required HTTP header
Authorization header value. Mint a Quizlar API key at https://quizlar.app/settings/api-keys (format: sk-qz-<32 chars>) and provide as 'Bearer sk-qz-...'.

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

We have not read this server’s tool list yet; we check endpoints in rotation.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 7, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account quizlar, which owns the repo
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
… Not checked yet
Endpoint responds
Not checked yet; we check endpoints in rotation
… Not checked yet
Sign-in with OAuth
Not checked yet; we check endpoints in rotation
… Not checked yet
No hidden instructions in tool descriptions
Not checked yet; we read the tool list when we check the endpoint

Compared with others in Marketing & social mediai

More stars than 0% of the other 2980 servers in this category
Published to the registry more recently than 8% of the other 2980 servers in this category
Basic checks equal to or better than 100% of the other 2980 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is Quizlar — voice-powered AI flashcards with spaced repetition safe?

It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

You need to fill in: Authorization

Does it run on my computer or in the cloud?

It runs in the maker’s cloud. Connect over the internet with nothing to install, but what you send passes through the maker’s servers.

Is it still maintained?

The GitHub repo last changed –, and the latest version (1.0.0) reached the registry 6 months ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. It connects by URL, so apps that accept remote MCP servers work too, such as ChatGPT in developer mode.

What can I use instead?

In the same category: MCP YouTube Transcript, Google Analytics MCP, BibiGPT YouTube Video Summarizer

Alternatives

Servers in the same category from other makers, sorted by stars.

Reading a card:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

MCP YouTube Transcript

by jkawamoto

An MCP server retrieving transcripts of YouTube videos

Runs on your computer★ 495MITUpdated 10 days ago

Install

Google Analytics MCP

by surendranb

GA4 MCP server for AI agents: schema discovery, server-side aggregation, analysis-ready defaults.

Runs on your computer★ 244MITUpdated 10 days ago

Install

BibiGPT YouTube Video Summarizer

by JimmyLv

AI video summarizer: summarize and transcribe YouTube, Bilibili, TikTok and podcast videos.

Runs in the cloud★ 137MITUpdated 10 days ago

Install

README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

Quizlar MCP Server

Voice-led, FSRS-scheduled flashcards from YouTube, PDFs, web, or text. Auto-graded quizzes.

Quizlar's MCP server lets Claude, Cursor, Cline, Windsurf, or any MCP-compatible client:

Create flashcard decks from YouTube videos, PDFs, web pages, or pasted text
Run auto-graded quizzes with the same tier-1-exact-match → phonetic → LLM grading pipeline that powers the voice product
Track memory with FSRS spaced repetition — Quizlar is the scheduler of record, every answer updates real memory state

This repo is the public discovery surface (server.json for the Official MCP Registry + a stdio bundle for clients that need it). The hosted MCP server itself is closed-source and runs at https://mcp.quizlar.app — /mcp/ for OAuth-capable clients, /mcp-apikey/ for apiKey Bearer auth (used by every snippet in this README).

Listings

Official MCP Registry — io.github.quizlar/mcp-server v1.0.0
Smithery — https://smithery.ai/servers/quizlar/quizlar

Setup

Mint an API key at https://quizlar.app/settings/api-keys (format: sk-qz-<32 chars>).
Pick your client below and paste the snippet.

Cursor

~/.cursor/mcp.json:

"mcpServers": { "quizlar": { "command": "npx", "args": [ "-y", "mcp-remote@0.14.3", "https://mcp.quizlar.app/mcp-apikey/", "--header", "Authorization:Bearer ${QUIZLAR_API_KEY}" ], "env": { "QUIZLAR_API_KEY": "sk-qz-..." } } } }

Windsurf

~/.codeium/windsurf/mcp_config.json — Windsurf supports Streamable HTTP natively, no wrapper needed:

"mcpServers": { "quizlar": { "serverUrl": "https://mcp.quizlar.app/mcp-apikey/", "headers": { "Authorization": "Bearer ${QUIZLAR_API_KEY}" } } } }

Then export QUIZLAR_API_KEY=sk-qz-... in your shell.

Claude Desktop

Open Settings → Connectors → "Add custom connector":

Name: Quizlar
URL: https://mcp.quizlar.app/mcp-apikey/
Add header → Name: Authorization, Value: Bearer sk-qz-...

Or edit claude_desktop_config.json directly using mcp-remote:

Cline

Edit cline_mcp_settings.json (Cline → Settings → MCP Servers → "Edit JSON"):

Detailed steps in llms-install.md.

Smithery

npx -y @smithery/cli@latest install @quizlar/quizlar --client claude

Replace claude with cursor, windsurf, etc. Smithery walks you through pasting your API key.

Tools

22 tools mapped 1:1 to learner verbs:

Build decks: create_deck, create_deck_from_text, create_deck_from_youtube, create_cards_batch, get_job_status
Quiz: quiz_me (composite: build + start in one call), start_quiz, submit_answer, skip_question, end_quiz
Browse: list_decks, get_deck, list_cards, search_decks, search_cards, list_sessions
Analytics: get_progress, get_study_recommendations, get_learning_velocity, get_knowledge_gaps, get_retention_curves, get_card_difficulty_stats

Auth

Bearer API key (sk-qz-<32 chars>) is the simplest path; the /mcp-apikey/ mount used in every snippet above accepts the Bearer header directly and skips the OAuth handshake that some stdio bridges can't drive. Quizlar also exposes full OAuth 2.1 with Dynamic Client Registration + PKCE on https://mcp.quizlar.app/mcp/ (discovery card at /.well-known/oauth-authorization-server) for clients that prefer a browser flow.

Troubleshooting

`401 Unauthorized` on every tool call — API key is missing, mistyped, or revoked. Re-mint at https://quizlar.app/settings/api-keys and paste the full sk-qz-… value, including the prefix, into the Authorization: Bearer … header.
Client doesn't see Quizlar tools after editing config — fully restart the client (most don't hot-reload MCP config). For Claude Desktop, quit from the menu bar; for Cursor / Windsurf / Cline, close all windows.
`mcp-remote` fails to launch — usually a Node.js / npx path issue. Run npx -y mcp-remote@0.14.3 --help in a terminal to verify it resolves; if behind a corporate proxy, set HTTPS_PROXY in the client's env block or install mcp-remote globally with npm i -g mcp-remote@0.14.3.
`429` / quota errors mid-quiz — free-tier daily limits reached. Quotas reset at midnight UTC; or upgrade at https://quizlar.app/settings/billing.
OAuth callback never returns to the client — your loopback port may be blocked. Fall back to the API-key flow above; it bypasses OAuth entirely.

For anything not covered here, file an issue at https://github.com/quizlar/mcp-server/issues or email .

License

MIT for this configuration repo. The hosted MCP server itself is proprietary.

Quizlar — voice-powered AI flashcards with spaced repetition

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

Values you fill in

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Marketing & social mediai

Common questions

Alternatives

MCP YouTube Transcript

Google Analytics MCP

BibiGPT YouTube Video Summarizer

README from the maker

Quizlar MCP Server

Listings

Setup

Cursor

Windsurf

Claude Desktop

Cline

Smithery

Tools

Auth

Troubleshooting

Links

License