The phrase "a solid user base" is correct and usable in written English.
It can be used when discussing the number of active users or customers that a product, service, or platform has, indicating stability and reliability.
Example: "The app has gained popularity due to its user-friendly interface and a solid user base that continues to grow."
Alternatives: "a strong user community" or "a robust customer base."
Vine already has a solid user base of video-sharing addicts.
If the app is able to gain a solid user base, it could prove to be a popular destination to both advertise and find rental properties.
While the media-popular social network has a solid user base that has continued to grow, it's growing at a glacial pace.
The company has built a solid user base with a software wallet for Bitcoin, and now also Ethereum and Bitcoin Cash.
We conclude that DIYBio Europe has so far been a responsible and transparent citizen science movement with a solid user base that will continue to grow irrespective of media attention.
Could you send me a bottle?" Some find these requests hard to turn down and by exerting this social pressure FarmVille has consolidated a solid user-base.
At this stage BlockTrail has "a few" such partnerships inked in Europe, and none in the U.S. as yet, so will be looking to build out this partnership network — assuming it can first galvanize a solid user-base behind another decentralized Bitcoin wallet play.
Of course, there is still a lot of love out there for the Picasa brand and it has solid name recognition with a mainstream user base, which could explain why Google has hesitated to force a transition to Google Photos.
Not a sign of a very robust user base.
The algorithm can be divided into three mutually dependent steps (Figure 3), namely, CCI mitigation and user grouping (blue coloured blocks with a solid line), user selection, based on the proposed adaptive scheduling metric using an incremental approach (green coloured blocks with a dashed line) and optimal transmission scheme selection (yellow coloured block with a dashed-dotted line).
