2026 OnceTool — Peek YouTube Subscriber Count

About

2026 OnceTool — Preview YouTube Subscriber Counts Before Watching

No more clicking into videos that are not worth your time.

Hover over any YouTube thumbnail for 0.25 seconds, and a small icon will appear in the upper-left corner.
Click it to see the real subscriber count of the video’s channel, then decide whether to spend time watching.

Why we built this

“Clicking in only to find ordinary content” happens every day.
Subscriber count is not the only standard, but it is one of the most direct indicators of a channel’s size and stability.

YouTube only shows this information after you open the video.
This extension moves it to the moment before you click, giving you one more signal and helping you waste less time.

Open YouTube, hover over a thumbnail for 0.25 seconds, and click the icon to see the subscriber count.

What you will see

Real subscriber count, sourced from Google’s official YouTube Data API v3
Works on the homepage, search results, channel pages, Shorts, and anywhere YouTube thumbnails appear
7-day server cache; repeated queries for the same channel are usually faster
Default 0.25-second delay to avoid accidental triggers; adjustable in advanced settings to 150 / 300 / 500 / 800 ms
Icon appears only on hover and does not modify YouTube’s original interface

Data source and what we do not do

Source: YouTube Data API v3, officially authorized by Google.

We do not scrape YouTube pages
We do not call unofficial YouTube APIs
The displayed number is the channel’s official subscriber count. If the channel hides its subscriber count, it will show as hidden

We do not:

Collect your video browsing list
Sell your hover behavior data

Each hover only sends the video ID to the backend and returns the corresponding channel subscriber count.
OnceAccount login status is stored only in chrome.storage.local and is not shared with other websites.

One account works across the OnceHit family of products: OnceEvent / OnceClip / OnceKeeper / OncePing / OnceTool.

About OnceTool

OnceTool is a collection of small tools from the OnceHit family.
Each tool is an independent Chrome extension focused on doing one thing well, using official APIs and respecting platform rules.

Other products in the family:

OnceEvent — In-store purchase lottery platform https://oncehit.net
OnceClip — AI video generation https://clip.oncehit.net
OnceKeeper — Collection and sharing community https://oncekeeper.com
OncePing — Website monitoring https://ping.oncehit.net
OnceTool — Small tools https://tool.oncehit.net
Maintained by the OnceHit team.

Support

Customer support: [email protected]
Service status: tool.oncehit.net