A blank MRR means the tool publishes a price but no revenue. Absence is information: the
tools that show revenue are a minority of the market, which is exactly why the ones that do are worth indexing.
Where this tool sits
SEO, content, social scheduling and landing-page tools. They are part of go-to-market, but they are sold to marketers at low monthly prices and rarely appear in a sales leader's budget, so they sit outside the core index and are counted separately.
How to read this page
Entry price is the cheapest monthly tier with a public price — not the tier most buyers end up on.
Latest monthly revenue is the most recent figure the tool published; the trail above shows every
observation the index has, with its date.
Tiers counts monthly plans found on the pricing page. A tool with one tier has one price to defend.
If the price column says no monthly price recorded, the tool quotes instead of publishing — above
$199 that is the norm in this market, not a gap in the data.