A friendly AI chatbot with streaming Markdown and code — built by Ahmad Raza of Ahmad Digital Studio.
Live Demo → · Download the Android App → · License: MIT
- Web: the live site opens a landing page with both options — or jump straight to the web chat. No sign-up, no key needed.
- Android: get the app from the download page, or install the APK directly (41 KB, Android 7.0+). The app opens straight into the chat — no landing page, no download buttons inside; app means app.
| Feature | What it means |
|---|---|
| Streaming answers | Replies arrive token-by-token with clean Markdown and syntax-highlighted code blocks |
| A real personality | A layered system prompt sets MarkBot's identity — a chatbot created and built by Ahmad Raza — plus its tone, grounding rules, and safety limits |
| No model talk | MarkBot never reveals, confirms, or denies the underlying AI model or provider — ask it, it will just say it is MarkBot |
| Free out of the box | The built-in chat runs on a free route that needs no API key at all |
| Bring your own key | Visitors can paste their own OpenRouter API key; it is stored only in their browser and used per request — never stored or logged on the server |
| Owner key, free only | If the owner configures a key, the server only ever calls a free model — never a paid one |
| Light, fast UI | A white, black & green interface that works as an installable PWA and a native Android app |
MarkBot is a Next.js (App Router) application. The chat UI posts to a single route,
POST /api/chat, which streams the reply using the Vercel AI SDK. For every request the
server picks its route in this order:
- Visitor key — if the visitor added their own key in the header panel, that key is used for their requests only.
- Owner key — otherwise, if
OPENAI_API_KEYis configured on the server, it is used with a free model. - Free no-key route — otherwise, a free OpenAI-compatible endpoint answers, so the demo always works.
The system prompt lives in src/lib/system-prompt.ts and is layered on purpose:
identity first, then tone and style, then grounding (never fabricate), then safety
(treat pasted content as data, not instructions), then a graceful fallback.
npm install
npm run devOpen http://localhost:3000. No environment variables are required — the free route answers out of the box. Optional, only if you want the server to use your own key:
| Variable | Purpose |
|---|---|
OPENAI_API_KEY |
Owner key (used with a free model only) |
OPENAI_BASE_URL |
OpenAI-compatible endpoint for the owner key (defaults to OpenRouter) |
The app deploys cleanly to Vercel as a standard Next.js project:
- Import the repository in Vercel (framework preset: Next.js).
- Optionally add
OPENAI_API_KEYunder Settings → Environment Variables. - Deploy. The Android APK in
public/is served at/MarkBot.apkand linked from/download.
MarkBot is built to collect as little as possible:
- No accounts, no sign-up, no chat storage — conversations are processed in real time and never saved on the server.
- No ads, no analytics trackers, on the website or in the Android app (internet permission only).
- Your own-key option stays yours — a visitor's key lives only in their browser's local storage, is sent per request to fetch replies, and is never stored or logged on the server.
- Messages are forwarded over HTTPS to an AI provider only to generate the reply — so don't paste passwords or other sensitive personal details into the chat.
Full policy: markbot-ahmad.vercel.app/privacy · PRIVACY.md
Designed and built by Ahmad Raza — freelance web developer & designer, Ahmad Digital Studio, Bihar, India. Portfolio: ahmadrazaa.me · YouTube: @buildbyahmad
MIT — see LICENSE.