There are lots of different tools which provide SOME of the features you need. However, as you probably already know, using lots of separate tools for managing a website can really confuse things and reduce efficiency. Since “time is money,” consider how valuable it is for your organization to streamline website management by using one single tool.
As for an affordable tool which does everything you need, I recommend checking out Monsido.
Monsido is an all-in-one Web Governance and Quality Assurance tool suite. It crawls your website once per week (or on-demand) and finds errors and improvement opportunities on the site.
The tool is very powerful, but is designed with user-friendliness in mind. The dashboard is easy to navigate and there are even in-app suggestions on what steps to take to fix errors. In other words, you don’t have to be an expert to use it.
As for costs, Monsido is very affordable. Quality Assurance, SEO Audit, Response Time Monitoring, and Analytics are all included in the price of the Enterprise Plus plan. If you need to get your website in compliance with Section 508 or WCAG standards, Monsido also offers Web Accessibility testing as a very affordable add-on.
Monsido does have a limited free plan, which you can use to check out the dashboard and the features. If you want the full functionality of the tool though, then you will of course have to sign up for a subscription.
If you want to see how Monsido compares to what you are using now, you can check out:
Full disclosure: I am the co-founder of Monsido.