Any SaaS business. In a week. And to be a "serious contender", you have to have feature parity. Yet now you're shifting the goalposts.
What's stopping you? There are 38 weeks left in 2025. Please build "serious contenders" for each of the top 38 most popular SaaS products before the end of the year. Surely you will be the most successful programmer to have ever lived.
My claim is that in a week you could build a thing that people want to use, as long as you can sell it, that's competitive with existing options for a given client. Salesforce is a CRM with walled gardens after walled garden. access to each of which costs extra, of course. they happened to be in the right place at the right time, with the right bunch of assholes.
A serious contender doesn’t have to start with everything. It starts by doing the core thing better—cleaner UX, clearer value, easier to extend. That’s enough to matter. That’s enough to grow.
I’m not claiming to replace decades overnight. But momentum, clarity, and intent go a long way. Especially when you’re not trying to be everything to everyone—just the right thing for the right people.
as for Spotify: https://bit.ly/samson_music
I'm not sure what you are trying to say here - that this website is comparable to Spotify? Even if you are talking about just the "core experience", this example supports the opposite argument that you are trying to make.
Spotify has the licensing rights to songs and I don't have the business acumen to go about getting those rights, so I guess I could make Pirate Spotify and get sued by the labels for copyright infringement, but that would just be a bunch of grief for me which would be not very fun and why would I want to screw artists out of getting paid to begin with?
i think ive detected the root cause of your problem.
and, funnily enough, it goes a long way to explaining the experiences of some other commentators in this thread on “vibe coding competitive SaaS products”.
Spotify is not the audio player widget in some user interface. It started off as a Torrent-like P2P system for file distribution on top of a very large search index and file storage. That's the minimum you'd build for a "whitelabel [...] Spotify clone". Since then they've added massive, sophisticated systems for user monitoring and prediction, ad distribution, abuse and fraud detection, and so on.
Use that code generation platform to build a product off any combination of two of the larger subsystems at Spotify and you're set for retirement if you only grab a reasonable salesperson and an accountant off the street. Robust file distribution with robust abuse detection or robust ad distribution or robust user prediction would be that valuable in many business sectors.
If building and maintaining actually is that effortless for you, show some evidence.
I'm listening. I fully admit that I was looking at Spotify as a user and thus only as a music playing widget so I'd love to hear more about this side of things. What is user prediction?
You can find out quite a lot in their blogs and publications:
https://research.atspotify.com/2022/02/modeling-users-accord...
This is the key insight here. Software is not the interface you see. There a whole lot more you don't know about (and probably no one knew before building it), and asking an LLM to find some JS front end patterns that abound in its training data won't come close to giving you.
That is why so many developers are skeptical of the amount of hype around LLMs generating code.