Docs & knowledge-base AI · comparison
MySiteGPT vs OpenAI Custom GPTs
Updated
The short version
Build a custom GPT on your own knowledge using OpenAI's GPT Builder inside ChatGPT.
OpenAI Custom GPTs let you spin up a tailored assistant in minutes: open the GPT Builder, give it instructions, upload a few knowledge files, optionally wire up actions, and you have a GPT trained on your material. For experimenting or sharing a helper with people who already live in ChatGPT, it's hard to beat — and it's effectively free with a ChatGPT account.
The catch for a SaaS builder is *where it lives*: a Custom GPT runs inside ChatGPT, not on your website. Visitors need a ChatGPT account, there's no first-class embeddable widget, no lead capture, and no citations pointing back to your own pages. If you're looking at an OpenAI Custom GPTs alternative because you actually want the assistant *on your site*, MySiteGPT is the other half of that equation: a source-cited, embeddable widget you drop in with one script tag, that captures leads and answers strictly from your content.
| Feature | MySiteGPT | OpenAI Custom GPTs |
|---|---|---|
| Where it lives | On your own website — a widget you embed with one async script tag (floating or inline), in an isolated Shadow DOM. | Inside ChatGPT; visitors open it via a share link or the GPT Store, not on your site. |
| Cited answers | Every claim carries a [n] marker tied to the exact page it came from, with a source card visitors can open. | Can reference uploaded files, but it doesn't cite back to your live website pages for your visitors. |
| Lead capture | Collects emails in chat, emails you the transcript instantly, and posts a lead.created webhook to Slack/Zapier. | No native lead capture — it's a chat surface inside ChatGPT, not a funnel on your site. |
| When it doesn't know | Answers strictly from your content; on low confidence it returns your fallback and logs the miss to fix in one click. | Falls back on the base model's general knowledge and can answer beyond your uploaded material. |
| Setup | Train on URLs/text/Q&A/files, then paste one script tag; visitors need nothing but your site. | GPT Builder is very fast to set up, but distribution depends on ChatGPT accounts and the GPT Store. |
| Pricing | Flat $9.99/mo after a 14-day no-card trial — OpenAI usage included and managed, with no per-message or per-seat metering. | Building a GPT is effectively free with a ChatGPT account; reaching all users can require ChatGPT Plus — check openai.com. |
| Best for | Putting a trustworthy, cited assistant on your marketing site or docs and capturing leads. | Sharing a helper with people already in ChatGPT, or publishing to the GPT Store. |
Compared in good faith from public materials as of June 2026. ChatGPT and Custom GPT availability and pricing are set by OpenAI and change often — confirm current terms on openai.com before deciding.
Why SaaS builders choose MySiteGPT over OpenAI Custom GPTs
- Your assistant lives on your own site, not behind a ChatGPT login — visitors get answers without leaving your product or creating an OpenAI account.
- Cited answers and an honest fallback keep it from confidently inventing details about your API or pricing, which a general-purpose GPT will happily do.
- It captures the lead: an email in chat, an instant transcript, and a webhook into Slack or your CRM — a Custom GPT just answers and forgets.
- Automatic content sync re-crawls your docs daily at a time you choose, so you're not manually re-uploading knowledge files each time something changes.
When OpenAI Custom GPTs is the better pick
If your goal is to reach ChatGPT's huge built-in audience — publishing to the GPT Store, or handing teammates a quick assistant they open inside ChatGPT — Custom GPTs are excellent and basically free to build. They're also a great sandbox for prototyping an assistant's instructions before you commit. MySiteGPT is the better pick when the assistant needs to live on *your* website, cite your pages, and turn conversations into leads.
MySiteGPT vs OpenAI Custom GPTs: frequently asked questions
Is MySiteGPT a good OpenAI Custom GPTs alternative for SaaS?
Yes, when you want the assistant on your own website rather than inside ChatGPT. MySiteGPT gives you an embeddable, source-cited widget with lead capture and an honest fallback — things a Custom GPT, which lives in ChatGPT, doesn't provide. If you mainly want to publish to the GPT Store, a Custom GPT fits better.
How does MySiteGPT pricing compare to OpenAI Custom GPTs?
Building a Custom GPT is effectively free with a ChatGPT account, though reaching every user can require ChatGPT Plus. MySiteGPT is one flat $9.99/mo Pro plan — 3 bots, 3,000 messages/month, 1,000 trained pages, OpenAI usage included and managed, remove-branding, plus REST API and webhooks — with no per-message or per-seat metering. You're paying for an embeddable, cited widget on your own site with lead capture and analytics, not a GPT inside ChatGPT. Check openai.com for current ChatGPT pricing.
Do I need an OpenAI API key to use MySiteGPT?
No — OpenAI usage is included and managed on the $9.99/mo Pro plan, so there's nothing to configure. Retrieval embeddings are included too. A Custom GPT similarly runs on OpenAI's models, but it lives inside ChatGPT rather than on your own site.
Does MySiteGPT answer only from my content?
Yes. It answers strictly from the content you train it on and cites the exact page behind each claim, returning your fallback when your content doesn't cover something. A Custom GPT, by contrast, can draw on the base model's general knowledge beyond what you uploaded.
See the cited answers for yourself
The chat bubble on our homepage is the product, trained on our own site — ask it anything and watch every claim link back to its source.