How does a startup manage its Cloud/SaaS subscription expenses.

I moved from a corporate role to a startup for the first time last year. Had the same need and was surprised how much SaaS-subscription costs were taking 📈 I think is one popular tool. Also Recently Seqoia-backed it seems. https://quolum.com/

Maybe not exactly what you're looking for, but it might be worth checking out Brex. They are a credit card (and now banking too) company for startups and their reward program is centered around the stuff you're likely to buy (SaaS/Cloud, computer equipment, etc.). It's pretty straightforward to issue and manage virtual cards for your team (you manage limits, can cancel them easily, etc.), and they generally do a great job categorizing your expenses. In the reporting section, you can easily pull up their software/SaaS category to see where you're spending. Last, we haven't been able to us this much, but they have a great partner program (a lot like the Product Hunt Founder Club) that gives you discounts on some of the most common SaaS vendors. We've been using them for a little over a year and I have zero complaints.