How do you track the reach of a Twitter hashtag?

I use a Twitter hashtag tracking tool to track the reach of a Twitter hashtag. The tool name is Trackmyhashtag - It is an easy to use hashtag tracking tool for Twitter which can track any hashtag, keyword, or account mention in real-time as well as past days.

Trackmyhashtag helps me to get useful hashtag analytics for a specific hashtag such as :

Total Tweets, contributors, potential reach and impression
Tweet timeline which shows date and time of Tweets
Influencers related to a hashtag
Most popular, retweeted and liked Tweets
Related hashtag and media
Language and client source
much more insights
You can use this tool for free as it offers a free trial in which you can track any 2 hashtags, keywords or accounts in real-time. I am sure you'll find it useful. You can also purchase its subscription plan to get more detailed analytics which is really affordable.

Here is a snapshot of the analytical dashboard provided by Trackmyhashtag :

I hope you’ll find my answer helpful.

If you still have any query then tell me.

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Thank you :)