Skip to main content

To trade in the US, go to polymarket.us

icon for #1 Free App in the US Apple App Store on September 18?
Tech·App

#1 Free App in the US Apple App Store on September 18?

icon for #1 Free App in the US Apple App Store on September 18?
Tech·App

#1 Free App in the US Apple App Store on September 18?

Sep 18

Sep 18

ChatGPT 66%

Muse 11%

Vinted 9%

TikTok Pro - Events 7%

Polymarket
NEW

ChatGPT 66%

Muse 11%

Vinted 9%

TikTok Pro - Events 7%

Polymarket
NEW
icon for ChatGPT

ChatGPT

$1,214 Vol.

66%

icon for Muse

Muse

$95 Vol.

11%

icon for Vinted

Vinted

$233 Vol.

9%

icon for TikTok Pro - Events

TikTok Pro - Events

$86 Vol.

7%

icon for Google Maps

Google Maps

$151 Vol.

4%

icon for Google Gemini

Google Gemini

$146 Vol.

3%

This market will resolve according to the iOS app, ranked #1 in the United States on the iPhone Apple App Store's overall Top Charts under "Free Apps", as of 12:00 PM ET on the specified date. If the chart is unavailable at 12:00 PM ET, this market may remain open for up to 48 hours to allow for the data to become available. If the data remains unavailable, this market will resolve according to the last published ranking. To find the overall chart, click "Apps" at the bottom of the US iOS App Store app, scroll down to "Top Free Apps" and click "See All". Then under "Free Apps" in the "Top Charts" section, you'll see the list that will be used as the resolution source to this market (https://apps.apple.com/us/charts/iphone).ChatGPT holds the strongest market-implied odds at 65% for the September 18 ranking due to its sustained position as the top free app in recent U.S. Apple App Store charts. The app's consistent leadership stems from high monthly active users exceeding 1 billion, substantial in-app subscription revenue, and broad adoption of its large language model features including voice mode and image generation. Other listed apps such as Muse, Vinted, TikTok Pro, Google Maps, and Google Gemini trail significantly in current productivity and overall free rankings, reflecting lower engagement metrics. With resolution just days away, traders are monitoring any sudden shifts in daily downloads or feature updates that could alter the short-term order.

This market will resolve according to the iOS app, ranked #1 in the United States on the iPhone Apple App Store's overall Top Charts under "Free Apps", as of 12:00 PM ET on the specified date.

If the chart is unavailable at 12:00 PM ET, this market may remain open for up to 48 hours to allow for the data to become available. If the data remains unavailable, this market will resolve according to the last published ranking.

To find the overall chart, click "Apps" at the bottom of the US iOS App Store app, scroll down to "Top Free Apps" and click "See All". Then under "Free Apps" in the "Top Charts" section, you'll see the list that will be used as the resolution source to this market (https://apps.apple.com/us/charts/iphone).This market will resolve according to the iOS app, ranked #1 in the United States on the iPhone Apple App Store's overall Top Charts under "Free Apps", as of 12:00 PM ET on the specified date. If the chart is unavailable at 12:00 PM ET, this market may remain open for up to 48 hours to allow for the data to become available. If the data remains unavailable, this market will resolve according to the last published ranking. To find the overall chart, click "Apps" at the bottom of the US iOS App Store app, scroll down to "Top Free Apps" and click "See All". Then under "Free Apps" in the "Top Charts" section, you'll see the list that will be used as the resolution source to this market (https://apps.apple.com/us/charts/iphone).
Volume
$1,925
End Date
Sep 18, 2026
Market Opened
Sep 11, 2026, 8:30 PM ET

Resolver

0x69c47De9D...
This market will resolve according to the iOS app, ranked #1 in the United States on the iPhone Apple App Store's overall Top Charts under "Free Apps", as of 12:00 PM ET on the specified date. If the chart is unavailable at 12:00 PM ET, this market may remain open for up to 48 hours to allow for the data to become available. If the data remains unavailable, this market will resolve according to the last published ranking. To find the overall chart, click "Apps" at the bottom of the US iOS App Store app, scroll down to "Top Free Apps" and click "See All". Then under "Free Apps" in the "Top Charts" section, you'll see the list that will be used as the resolution source to this market (https://apps.apple.com/us/charts/iphone).ChatGPT holds the strongest market-implied odds at 65% for the September 18 ranking due to its sustained position as the top free app in recent U.S. Apple App Store charts. The app's consistent leadership stems from high monthly active users exceeding 1 billion, substantial in-app subscription revenue, and broad adoption of its large language model features including voice mode and image generation. Other listed apps such as Muse, Vinted, TikTok Pro, Google Maps, and Google Gemini trail significantly in current productivity and overall free rankings, reflecting lower engagement metrics. With resolution just days away, traders are monitoring any sudden shifts in daily downloads or feature updates that could alter the short-term order.

This market will resolve according to the iOS app, ranked #1 in the United States on the iPhone Apple App Store's overall Top Charts under "Free Apps", as of 12:00 PM ET on the specified date.

If the chart is unavailable at 12:00 PM ET, this market may remain open for up to 48 hours to allow for the data to become available. If the data remains unavailable, this market will resolve according to the last published ranking.

To find the overall chart, click "Apps" at the bottom of the US iOS App Store app, scroll down to "Top Free Apps" and click "See All". Then under "Free Apps" in the "Top Charts" section, you'll see the list that will be used as the resolution source to this market (https://apps.apple.com/us/charts/iphone).This market will resolve according to the iOS app, ranked #1 in the United States on the iPhone Apple App Store's overall Top Charts under "Free Apps", as of 12:00 PM ET on the specified date. If the chart is unavailable at 12:00 PM ET, this market may remain open for up to 48 hours to allow for the data to become available. If the data remains unavailable, this market will resolve according to the last published ranking. To find the overall chart, click "Apps" at the bottom of the US iOS App Store app, scroll down to "Top Free Apps" and click "See All". Then under "Free Apps" in the "Top Charts" section, you'll see the list that will be used as the resolution source to this market (https://apps.apple.com/us/charts/iphone).
Volume
$1,925
End Date
Sep 18, 2026
Market Opened
Sep 11, 2026, 8:30 PM ET

Resolver

0x69c47De9D...

Related

icon for Will ChatGPT be #2 Free App in the US Apple App Store on September 18?

Will ChatGPT be #2 Free App in the US Apple App Store on September 18?

23%
icon for Will Shadowrocket be #1 Paid App in the US Apple App Store on September 18?

Will Shadowrocket be #1 Paid App in the US Apple App Store on September 18?

95%
icon for Will HotSchedules be #2 Paid App in the US Apple App Store on September 18?

Will HotSchedules be #2 Paid App in the US Apple App Store on September 18?

89%

Beware of external links.

Frequently Asked Questions

"#1 Free App in the US Apple App Store on September 18?" is a prediction market on Polymarket with 6 possible outcomes where traders buy and sell shares based on what they believe will happen. The current leading outcome is "ChatGPT" at 66%, followed by "Muse" at 11%. Prices reflect real-time crowd-sourced probabilities. For example, a share priced at 66¢ implies that the market collectively assigns a 66% chance to that outcome. These odds shift continuously as traders react to new developments and information. Shares in the correct outcome are redeemable for $1 each upon market resolution.

"#1 Free App in the US Apple App Store on September 18?" is a newly created market on Polymarket, launched on Sep 11, 2026. As an early market, this is your opportunity to be among the first traders to set the odds and establish the market's initial price signals. You can also bookmark this page to track volume and trading activity as the market gains traction over time.

To trade on "#1 Free App in the US Apple App Store on September 18?," browse the 6 available outcomes listed on this page. Each outcome displays a current price representing the market's implied probability. To take a position, select the outcome you believe is most likely, choose "Yes" to trade in favor of it or "No" to trade against it, enter your amount, and click "Trade." If your chosen outcome is correct when the market resolves, your "Yes" shares pay out $1 each. If it's incorrect, they pay out $0. You can also sell your shares at any time before resolution if you want to lock in a profit or cut a loss.

The current frontrunner for "#1 Free App in the US Apple App Store on September 18?" is "ChatGPT" at 66%, meaning the market assigns a 66% chance to that outcome. The next closest outcome is "Muse" at 11%. These odds update in real-time as traders buy and sell shares, so they reflect the latest collective view of what's most likely to happen. Check back frequently or bookmark this page to follow how the odds shift as new information emerges.

The resolution rules for "#1 Free App in the US Apple App Store on September 18?" define exactly what needs to happen for each outcome to be declared a winner — including the official data sources used to determine the result. You can review the complete resolution criteria in the "Rules" section on this page above the comments. We recommend reading the rules carefully before trading, as they specify the precise conditions, edge cases, and sources that govern how this market is settled.