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Customer calls at scale — Fastlane's 2,000 calls behind $69k MRR

How Fastlane (AI short-form video tool, $69k MRR two months after launch, self-reported) ran ~20 customer calls a week — an in-app "book a call for 7 extra days" button, Mom Test questions, silent screen-share usability tests, power-user interviews, AI notes in Notion fed to a Claude-built "customer intelligence" dashboard.

Updated 2026-10-24·1 source·customer-researchcustomer-discoverymom-testusability-testingsaasai

Customer calls at scale (Fastlane)

TL;DR

  • Fastlane’s founders did ~20 calls a week from August — ~2,000 calls total — and credit that, not a marketing trick, for $69k MRR within ~2 months of launch.
  • Recruit with an incentive inside the product: a rainbow-bordered “Book a call with the team for 7 days of extra access” button → Calendly.
  • Three call types: discovery (Mom Test), usability (watch silently), customer success (interview power users).
  • Record with an AI notetaker, store in Notion, give Claude access via MCP, and build a dashboard that scores “customer love” and segments by signup reason.
  • Users who signed up out of curiosity retained worse than those who said “I need marketing now”.

Details

Context. Gaurav and co-founder Jock started with Cassius AI, a horizontal tool (SEO, LLM visibility, Reddit engagement, short-form content). V1s shipped July–September; calls showed short-form video was the real job, so they rebuilt vertically from October, shipped a beta in December to a ~2,000-person waitlist, and launched Fastlane publicly on 23 March. It went from ~$16k ARR (paid beta) to 1,000+ paying users, $69k MRR and $1M+ ARR across the business, figures Gaurav showed on Stripe.123

Getting people on calls. In-app button with a rainbow border offering 7 extra days of access for booking a call; Calendly opens directly. Early on: personal network, Twitter DMs, paying people if needed.45

Phase 1 — discovery (before building). Mom Test rules: never ask “would you use this?” or “do you like my idea?”. Ask how they solve the problem now, to walk through the last time, what it cost in time or money, and what happens if they do nothing. Build when you hear a shared, painful problem.56

Phase 2 — usability (MVP). “Fight for customers one-to-one”: crawl Reddit threads and post lead magnets; when someone joins the waitlist, email a call invite; on the call send the platform link, ask them to share their screen, and stay silent — don’t rescue them from a confusing button, because the friction is the data.6

Phase 3 — customer success. Use PostHog to find power users, call them, and ask how the product helps. This surfaced that views, conversions and app installs from short-form were the value, so they went all in. The Tinder-style swipe UI (trending format on the left, your generated version in the middle, swipe right to schedule to TikTok/Instagram/YouTube) came out of this.67

Customer intelligence system. AI notetaker on every call → notes in Notion → Claude with MCP access to their data → a dashboard the non-technical co-founder built in natural language with Claude Code. It segments paying customers by business type and tenure, filters by “why they signed up”, and ranks a composite “customer love score”; the roadmap follows what the highest-love users ask for.89

Host’s takeaway. Pat Walls: talking to customers is the mechanism for finding where to market — where they found you, where they hang out, what they need. Fear of rejection is why founders avoid it.910

Disagreements / caveats

  • Starter Story sells an ideas database and features success stories; revenue is founder-reported (Stripe shown on screen, not audited). Fastlane’s users are indie founders who also watch Starter Story — an unusually reachable audience.
  • 2,000 calls with two founders is a big time cost; Marc Lou’s portfolio approach (Finding small-product ideas — build to find signal, scratch your own itch, ride a moment) gets signal from launches instead.

See also

Footnotes

  1. How This SaaS Hit $69K/Month In Just 2 Months @ 00:52 — Gaurav ↩

  2. How This SaaS Hit $69K/Month In Just 2 Months @ 02:56 — Gaurav ↩

  3. How This SaaS Hit $69K/Month In Just 2 Months @ 03:58 — Gaurav ↩

  4. How This SaaS Hit $69K/Month In Just 2 Months @ 06:19 — Gaurav ↩

  5. How This SaaS Hit $69K/Month In Just 2 Months @ 09:58 — Gaurav ↩ ↩2

  6. How This SaaS Hit $69K/Month In Just 2 Months @ 10:53 — Gaurav ↩ ↩2 ↩3

  7. How This SaaS Hit $69K/Month In Just 2 Months @ 12:27 — Gaurav ↩

  8. How This SaaS Hit $69K/Month In Just 2 Months @ 07:50 — Gaurav ↩

  9. How This SaaS Hit $69K/Month In Just 2 Months @ 09:00 — Gaurav, Pat Walls ↩ ↩2

  10. How This SaaS Hit $69K/Month In Just 2 Months @ 15:01 — Pat Walls ↩