ARR is the number on every SaaS board deck. It's the headline metric in fundraising conversations, in press releases, in LinkedIn announcements. And it is, in isolation, one of the least informative metrics in your business.
The problem with ARR as a primary success metric: it's a backward-looking contract commitment number that conflates quality of customers, quality of revenue, and business efficiency into a single dollar figure. A company with $10M ARR growing at 60% year-over-year could be a rocketship or a business about to collapse depending on what's behind that number.
What ARR hides:
Revenue quality. $10M ARR composed of 50 enterprise accounts with 120% NRR is a fundamentally different business than $10M ARR composed of 1,000 SMB accounts with 75% NRR. Both report $10M ARR. One is building a durable business. The other is running a leaky bucket.
Growth efficiency. 100% year-over-year growth achieved with a $1.50 CAC ratio (you spend $1.50 to acquire $1 of ARR) is a burning-platform story. The same growth with a $0.50 CAC ratio is a machine worth scaling. ARR doesn't tell you which you are.
Commitment vs. earned revenue. ARR includes contracted revenue that hasn't been earned yet — annual contracts where the customer paid upfront or committed on paper. If your churn rate is high, a significant portion of that ARR will never be recognized as lasting customer value.
The metrics that tell the actual story: NRR (revenue quality and expansion), CAC payback (growth efficiency), gross margin (business model strength), and Rule of 40 or Burn Multiple (overall business efficiency).
ARR is a reporting metric. Run your business on the metrics that drive it.