There’s some excellent news and bad news for ChatGPT’s mobile efforts. On the positive side, the AI chatbot continues to see the variety of app installs and its revenue grow, with September setting a latest record on each fronts: 15.6 million downloads and nearly $4.6 million in gross revenue across its iOS and Android apps worldwide. Nonetheless, in response to latest data from market intelligence firm Appfigures, revenue growth has now begun to slow. While over the past couple of months, revenue growth was topping 30% — 31% in July and 39% in August — that dropped to twenty% growth as of September.

Slowing revenue growth might be the primary indication that ChatGPT is nearing saturation by way of what number of mobile users are willing to pay for the upgraded ChatGPT+ subscription service — a reasonably hefty $19.99 monthly in-app purchase that gives faster response times, priority access at peak times and early access to latest features and enhancements. The subscription has sold well thus far, as ChatGPT on mobile brought in gross revenues of $2.1 million in June, increasing to $2.74 million in July, then $3.81 million in August, and now, the newest record, $4.58 million in September.

Surprisingly, nonetheless, ChatGPT is just not the most important AI app by revenue. A competitor called Ask AI is making more due to heavy ad spending, rising from $6.48 million in May, when ChatGPT mobile launched, to a peak of $6.55 million in August, Appfigures’ data indicates. It dropped barely in September, all the way down to $5.51 million — but that’s still larger than ChatGPT. Other competitors like Genie and AI Chat Smith haven’t grown as big as Ask AI.

Net revenue could also be a distinct story, given Ask AI’s ad spend, in fact. As for ChatGPT, it netted around $3.2 million in September after Apple and Google took their cut of the in-app purchase revenues.

Along with its revenue record, ChatGPT saw 15.6 million installs in September, bringing its lifetime total to 52.2 million, Appfigures estimates. Google Play is driving the downloads, accounting for 9 million in September while the App Store accounted for the opposite 6.6 million.

However the App Store, not surprisingly, is driving revenue — or $3 million of the full in-app purchases last month. The U.S. is the most important marketplace for the AI chatbot app, accounting for 60% of ChatGPT’s revenues.