Last updated 06-30-2026
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Ghostly
Ghostly lets you build knowledge chatbots for your website using your own OpenAI API keys. You upload documents or URLs, train a bot on that content, customize how it looks and responds, then embed it on your site. The platform charges for bot infrastructure while you control AI usage and costs directly with OpenAI.
The bring-your-own-key model is the core idea. Ghostly does not bill per message. You connect GPT-3.5, GPT-4, or GPT-4o, set your system prompt and welcome messages, and adjust colors and themes so the widget matches your brand.
It fits site owners, support teams, and small businesses that want a trained assistant without building chat infrastructure from scratch. Setup is positioned as a five-minute flow with no coding required.
Connect your own OpenAI key instead of paying per message through Ghostly
Train bots on PDFs, text files, markdown, and website URLs
Tweak system prompts, welcome messages, and predefined replies
Switch between dark and light themes with custom brand colors
Drop an embeddable widget onto any site with translation options
Pick GPT-3.5, GPT-4, or GPT-4o for each chatbot you run
Bring-your-own OpenAI key keeps message costs under your control.
Free tier includes one chatbot with no Powered by Ghostly badge.
Supports training on PDFs, text, markdown, and URLs in one workflow.
Appearance controls cover themes, colors, and logo matching.
Requires your own OpenAI API key and billing setup before the bot can respond.
Backend API access is listed as in development, not available yet.
Higher tiers cap chatbots at five on the published Pro plan.
Does Ghostly have a free plan?
Yes. Ghostly offers a free plan with one chatbot and limited resources. Paid Basic and Pro plans add more chatbots, higher character limits, and additional website link slots.
Do I need my own OpenAI API key to use Ghostly?
Yes. Ghostly uses a bring-your-own-key model on every plan. You connect your OpenAI account and choose GPT-3.5, GPT-4, or GPT-4o while Ghostly bills for chatbot infrastructure.
What file types can I train a Ghostly chatbot on?
Ghostly supports PDF files, plain text files, markdown files, and URLs. You can update training sources later without rebuilding the bot from scratch.
Can I customize how a Ghostly chatbot looks on my site?
Yes. Ghostly lets you adjust dark or light themes, custom colors, and your logo so the embedded widget matches your website design.
Does Ghostly integrate with other tools or services?
Ghostly embeds on websites today and notes that an API version is in development for backend access. OpenAI models are supported through your own API keys.
How much does Ghostly cost?
Ghostly's free plan is $0. Basic is $10 per month for two chatbots and 15 million characters. Pro is $30 per month for five chatbots and 50 million characters. All plans let you remove the Powered by Ghostly badge.