ForwardCheck

Android — from the share sheet (no typing)

This is the closest thing to being inside WhatsApp, and it needs no server, no account and no bot:

1. Open this site in Chrome and choose Install app (or Add to Home screen).
2. In WhatsApp, long-press the forwarded message and tap Share.
3. Pick ForwardCheck from the share sheet. It opens with the message already filled in and the check already running.

The message is handed to the page, not to a server. If this deployment has no API keys configured, nothing about it leaves the phone.

iPhone & iPad

Safari does not yet let a website register itself in the share sheet, so use a Shortcut once and it appears there forever:

1. Open Shortcuts → New Shortcut.
2. Enable Show in Share Sheet and set it to accept Text.
3. Add URL → Open URLs and build it as https://YOUR-SITE/?text=[Shortcut Input]
4. Name it ForwardCheck. It now shows up when you tap Share on a message.

A link that arrives preloaded

Any link of this shape opens the checker with the message already in the box — useful for a poster, a QR code at a desk, or a link someone can forward:

https://YOUR-SITE/?text=PASTE-THE-URL-ENCODED-MESSAGE-HERE

The message is stripped from the address bar as soon as the page opens, so a shared link does not leave someone's forward sitting in their browser history.

Telegram — the quick one

Anyone with the bot's @username can use it. Setting it up is a token and one command:

1. Message @BotFather, send /newbot, keep the token.
2. Set the Worker secrets: npx wrangler secret put TELEGRAM_BOT_TOKEN npx wrangler secret put TELEGRAM_WEBHOOK_SECRET
3. Point Telegram at the deployment (one command; it needs the two secrets above): npm run set-webhook -- https://YOUR-SITE

Then forward any message to the bot and the verdict comes back in the chat. Send /start for the instructions.

WhatsApp — where the forwards actually are

This needs a Meta app and a WhatsApp Business number. Create the app, add the WhatsApp product, and take note of four values: the access token, the phone number ID, the app secret, and a verify token you invent.

1. Set the secrets: npx wrangler secret put WHATSAPP_TOKEN npx wrangler secret put WHATSAPP_PHONE_NUMBER_ID npx wrangler secret put WHATSAPP_APP_SECRET npx wrangler secret put WHATSAPP_VERIFY_TOKEN
2. In the app's WhatsApp → Configuration page, set the callback URL to https://YOUR-SITE/whatsapp and enter the same verify token there.
3. Subscribe to the messages webhook field.
4. Forward a message to the business number and the verdict comes back.

Meta only allows free-form replies inside the 24-hour window a user's message opens, so the bot answers immediately rather than sending follow-ups. Every incoming call is checked against the X-Hub-Signature-256 HMAC before it is parsed.