You may find information about your current subscription on your Speechify app's setting page.
To go to settings, please click the 👤 icon at the upper left corner of the page. Then you should see a ⚙️ icon on the top right corner. Clicking on that takes you to Settings.
On the Settings page, click your name and this should show you the following info:
Email address associated with your Speechify account
Date you started your membership or current plan
Type of subscription plan
HD words left
HD words batch you get each time it refreshes
Date your HD words refreshes
Date your subscription plan renews