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Turn it into a business proposal first, then ask relevant people whether they think the chance is good that the app will be successful.
However, even after their opinion, you need to ensure that the app is well built and have enough exposure to your target market through advertising.
Usually, you can’t sell an app or website. You sell a business. The app might be part of the product. But without customers and revenue you have little to no proven value.
Similarly, investors don’t invest in ideas. They invest in functional business models, based either on actual sales or some other tangible form of traction that goes well beyond your idea, passion, and confidence that it will work.
In short, you have to prove it will work before anyone is going to give you money.
You never know for sure if your ideas will sell. But you will get better at it when you fail several times. If there are competitors, there’s likely a market. But even if there’s a market and you have a solution/product, yo it potential customers still need to find you. Anyway, just start learning programming and build these apps yourself. No one will invest in an idea.