YouTube to Transcript is an active Chrome extension with 20K WAU in CWS
Metrics:
+ $200 MRR,
+ $45/mo costs,
+ 10k+ registered users.
+ 40% users from Tier 1 countries (20% USA)
The sale includes the Chrome Web Store asset, a top-ranked WordPress landing page with avg. position 7.4, and a Bubble.io backend (I can move it to your server).
Monetization: SaaS subscriptions & lifetime deals.
Growth points: leveraging content SEO and migrating to custom code to drop operating costs to $15/mo.