Field Notes
Operating notes from the runway window.
The field notes behind every interactive tool we ship. Math first. Marketing last. Written for the period between first paying customer and Series A.
May 8, 2026
How to Calculate SaaS Runway in 4 Inputs (Free Calculator)
Stop modeling runway in a spreadsheet that breaks every quarter. Four inputs, three scenarios, one default-alive verdict — plus a worked example and the free MRR Canvas calculator.
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May 6, 2026
MRR vs ARR: Which One Should a Bootstrapped SaaS Track First?
MRR is the operator's number. ARR is the storyteller's number. A side-by-side breakdown with formulas, cadence, and the sub-$10K MRR rule most bootstrappers get wrong.
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May 4, 2026
The SaaS Runway Playbook for Bootstrapped Founders (2026)
Runway is the operator's first metric. Three runway models, a worked $18K MRR example, and the 18-month target most pre-seed founders miss. Free calculator inside.
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