Social caption writer

Bring your own key — your key and content are never stored or logged

🔑 Add your AI API key to begin

Your key is stored only in this browser (IndexedDB) and is sent only to your chosen provider through our server, which never logs or stores it. Manage all keys in Settings. BYOK & free — you pay the provider directly.

This tool sends your text and key to your chosen AI provider (through our server, which never logs or stores them). It is not on-device — turn to the offline tools for fully local processing.

AI social caption writer — engaging captions with hashtags

Turn a few details into an engaging social caption with relevant hashtags. This is a bring-your-own-key AI tool. It works with your own API key — and Groq and NVIDIA give free keys, so you can use it at no cost. Your key is stored only in this browser; your text is sent to your chosen provider through our server, which never logs or stores your key or text. It runs on the provider's servers, so it is not on-device.

How to use it

  1. Add an AI key in the key bar (free from Groq or NVIDIA; also Anthropic, OpenAI or xAI).
  2. Paste your text and pick any options.
  3. Press the button — the result comes back from your chosen AI. Copy or Download it.

FAQ

How do I write a caption?

Describe what you're posting and pick a platform; the AI writes a caption with a few hashtags. Keep claims accurate to your post.

Is my details kept private?

Your key lives only in this browser. Each request sends your text and key to your chosen provider through our server, which never logs or stores either. We keep no copy — but the provider processes your text under their terms.

Where do I get a free API key?

Groq (console.groq.com) and NVIDIA (build.nvidia.com) both offer free keys — no card needed. Paste one into the key bar once and it is remembered on this device. Anthropic, OpenAI and xAI keys work too.

Limits

Review tone and hashtags for your brand before posting; the AI writes from your details only.

Related

Write the product copy with the product description writer.

Your key stays in this browser. Manage or clear all keys any time in Settings.