SparkGPT vs SiteGPT: Support Chatbot or AI Sales Agent?

What SiteGPT Does Well

Credit first, because it is earned. SiteGPT is one of the earlier products in the "train a chatbot on your own website" category and it does the core mechanics competently. You give it your URL, it ingests your pages, and you get a bot that answers questions in your brand's context rather than generic ChatGPT answers. It supports escalation to a human when the bot is out of its depth, it can capture leads, and it covers the standard installation surfaces a small business needs.

For its stated job, deflecting repetitive support questions so a human does not have to answer them, SiteGPT is a fine choice. The comparison below is not about whether SiteGPT works. It is about whether ticket deflection is actually the job you need done.

The Job Each Product Is Built For

A support chatbot measures success by conversations it ended. The visitor asked about shipping, got an answer, and went away without creating a ticket. That is the win condition, and the entire product is tuned for it.

A sales agent measures success by orders it produced. When a visitor asks about shipping to Canada, SparkGPT answers the question and then keeps the conversation moving toward a purchase. It recommends the product that fits, compares two items the visitor is deciding between, and points to checkout. The official line on the SparkGPT homepage is blunt about this: "It doesn't just answer. It sells."

This difference sounds like marketing until you watch the two behaviors side by side. A deflection bot treats the end of a conversation as success. A sales agent treats the end of a conversation without a next step as a miss. For a store owner, that behavioral difference is the whole product.

Pricing: Subscription Credits vs Pay For Results

The pricing models express the same philosophical split.

SiteGPT sells tiered monthly subscriptions where each tier includes a monthly allowance of messages, and bigger allowances cost more. As of September 2026, the Starter plan is $59 per month for 1 chatbot, Growth is $129 per month for 2, and Scale is $429 per month for 3, with annual billing bringing those down to an effective $39, $79, and $259. The allowance depends heavily on which AI model you choose: Starter includes 4,000 messages a month on GPT-4.1-mini but only 400 on the full GPT-4.1 model, a 10x difference on the same plan. Removing the SiteGPT branding from the widget is a separate add-on at $39 per month billed annually, and there is no free plan, only a 7 day trial that requires a credit card. The structural consequence: a busy month costs you more even if none of those conversations buy anything. Traffic is your cost driver, not revenue.

SparkGPT's Growth plan works differently. You pay $49 per month, conversations are unlimited, and the variable part of the bill is 5% of sales attributed to the agent. If the agent sells nothing in a month, the 5% is zero and you paid $49. If it drives $3,000 in attributed orders, you pay $49 plus $150, and you can see all $3,000 of those orders listed in your ROI dashboard. You only pay when SparkGPT makes you a sale.

Two honest caveats on this table. First, if your site is a documentation portal or a SaaS help center with no checkout, revenue attribution means nothing to you and SiteGPT's model maps to your use case perfectly well. Second, the 5% is real money when the agent performs. A store where the agent attributes $10,000 a month pays $549. The counterpoint is that this bill only exists because $10,000 in tracked orders exists, and each of those orders is auditable in the dashboard. Most owners take that trade every time, but it is a trade, and you should see it clearly.

Revenue Attribution: The Number That Settles the Debate

Here is the question that separates the two products in practice: after three months, what did the chatbot actually do for the business?

With a credit metered support bot, the honest answer is usually a count of conversations and an assumed deflection rate. Useful, but it is an activity number, not a money number.

SparkGPT's answer is a money number. When a visitor talks to the agent, that session is tagged. If the visitor places an order within 24 hours, the order is counted as agent attributed and appears in the ROI dashboard with its value and the conversation behind it. The 24 hour window is deliberately conservative. A customer who chats on Monday and buys on Friday falls outside it, so that sale is never billed even though the agent probably helped. The model errs in your favor, and you can cross check any attributed order against your own store's order records line by line.

This is also why the pricing can be results based at all. Competitors metering by message credits cannot bill you 5% of sales, because their product does not know which sales it made. The attribution system and the pricing model are the same feature seen from two sides.

Setup: Both Are Fast, One Is Free to Prove

Setup mechanics are similar and neither requires code. You paste your website URL, the platform crawls your content, and you embed a snippet. SparkGPT goes from URL to a working agent in about 10 minutes, and the Free plan lets you build that agent and test it with unlimited conversations, forever, with no credit card. The Free plan cannot deploy to your live site, which is exactly the point: you get to interrogate the agent on your real catalog for as long as you want before paying anything.

That makes switching, or just comparing, close to free. If you are on SiteGPT today, you do not have to migrate anything to run the test. Build a SparkGPT agent from the same URL, ask it the ten questions your customers actually ask, and then ask it the question a support bot is never designed to handle well: "which one should I buy?" Judge the difference yourself before a dollar moves.

Which One Should You Pick?

Pick SiteGPT if you are a support operation first. A SaaS company with a big help center, a service business fielding the same twenty questions, a team that measures ticket deflection. Metered support chat is a fair fit for that job.

Pick SparkGPT if you sell things on your website and want the conversation layer to produce revenue you can point at. That is Shopify and ecommerce store owners, and businesses like travel agencies, real estate, restaurants, and coaching where a visitor with an unanswered question is a lost sale. If a comparison against the biggest name in the category is more useful to you, the same analysis for Chatbase is at SparkGPT vs Chatbase.

Frequently Asked Questions

What is the main difference between SparkGPT and SiteGPT?

SiteGPT is a customer support chatbot built to answer questions and deflect tickets. SparkGPT is an AI sales agent built to turn website visitors into buyers. Both train on your website content, but SparkGPT guides conversations toward recommendations and checkout, tracks which orders came from those conversations within a 24 hour attribution window, and prices on results at $49 per month plus 5% of attributed sales.

How does SparkGPT's pricing compare to SiteGPT's?

SiteGPT charges tiered monthly subscriptions metered by messages, starting at $59 per month for 4,000 GPT-4.1-mini messages, so cost scales with conversation volume. SparkGPT Growth costs $49 per month with unlimited conversations, plus 5% of sales attributed to the agent within 24 hours of a conversation. If the agent sells nothing, the 5% is zero. Billing is prepaid, 1 credit equals $1, and the agent pauses if the balance runs out rather than charging you unexpectedly.

Can I test SparkGPT before paying anything?

Yes. The Free plan costs $0 forever, requires no credit card, and lets you build one agent from your website URL and test it with unlimited conversations. It cannot deploy to your live site, so you upgrade to Growth when you want it in front of customers. Testing side by side against an existing SiteGPT bot requires no migration at all, and SiteGPT itself offers no free plan, only a 7 day trial with a credit card.

How does SparkGPT know which sales the agent made?

When a visitor chats with the agent, the session is tagged. An order placed within 24 hours of that conversation is counted as agent attributed and appears in the ROI dashboard with its value and the conversation behind it. Orders outside the 24 hour window are never attributed or billed, and you can audit every attributed order against your own store records.

Is it hard to switch from SiteGPT to SparkGPT?

No. SparkGPT builds its agent from your website URL the same way, so there is no data to export or migrate. You create the agent, test it free, and when you are ready you replace one embed snippet with another in your site template. The whole change takes about 10 minutes.

Prove It on Your Own Store

Build your agent free at www.sparkgpt.ai. Paste your URL, let it learn your catalog, and test it against your hardest customer questions with no credit card and no expiry. If it does not sell better than what you have, you have lost ten minutes. If it does, you will see exactly which orders it earned, in dollars, on one dashboard.