Napkin Math

We spent a week in San Francisco at peak AI hype: speaking at conferences, attending OpenAI’s Dev Day, and visiting founders’ offices in Palo Alto. Here’s everything we learned.

Timestamps:

0:00 Intro
0:33 Everyone is building the same thing
6:02 Value is extracted via capabilities
11:40 What a harness means in 2026
18:53 Outro

In this video, I share 3 practical frameworks for discovering startup ideas with proven market demand, backed by real-world examples from founders in Ramen Club, the founder community I run.

I also break down the 3 common mistakes that stop promising ideas from taking off, and how founders can avoid them before investing their time, money, and energy.

Timestamps👇 

00:00 3 ways to find startup ideas
00:42 Who I am
00:53 Copy a competitor, add a spin
03:28 Copy it into a new market
05:41 Ride a rising trend
07:33 Mistake 1: Fearing competition
09:12 Mistake 2: Skipping market research
10:47 Mistake 3: Not committing
11:26 Bonus: Marketing intensity
11:54 Outro

How to get your first 100 paid customers with no audience, no money and no experience. Charlie on the brute-force phase behind VEED's first million users, the Y Combinator rejection that forced a paywall up in one weekend, and the napkin math for 100 users in a single day.

Timestamps
00:00  Intro
00:28  Brute force
03:42  75% marketing, 25% building
06:29  Instant vs compounding channels
09:57  The YC rejection
11:09  The survey said no
13:11  One line of copy
15:31  Find one channel
21:00  The real hack is intensity
23:46  100 users in a day
25:11  What I'd do today

The identifier app category is quietly exploding and most people still haven’t noticed. Some of these apps are generating $1M–$20M in ARR.

In this episode, we break down the full playbook: using keyword data to find the right niche, the “come for the snap, stay for the hobby” retention loop, and the 60-second onboarding flow that leads straight to a hard paywall.

Timestamps:

00:00  Guess the revenue
02:31  How to find the idea
07:24  Come for the snap, stay for the hobby
10:14  How they grow
13:25  The hard paywall
19:29  The problem with high-churn apps
20:32  The unsexy version: $50M+ B2B
25:38  What to build next

In this episode, we break down how James Dyson, one of the world’s most iconic inventors and entrepreneurs, turned Dyson into a multi-billion-dollar company by questioning everyday products, embracing thousands of failed prototypes, and staying relentlessly obsessed with great engineering.

Timestamps
00:00 Introduction: James Dyson's startup story

03:20 From art school to entrepreneur 

08:30 Reinventing the wheelbarrow (The Ballbarrow) 

14:15 Inventing the bagless vacuum cleaner 

22:00 Why incumbents rejected Dyson's innovation 

30:05 Why customer research often fails innovators 

39:25 The Dyson electric car that never launched 

42:20 Startup lessons for the AI era 

50:30 Final takeaways: Reinvention, resilience & long-term thinking

Elston Baretto, founder of Tiiny Host, joins us to break down how he grew his drag-and-drop file hosting platform to 2M+ users with zero market research. We cover the SEO and PLG tactics that got him to $100K, the freemium/trial tweaks that pushed him past $1M, how AI tools like Claude Code reshaped his engineering workflow — and the wild side of running a hosting company, from phishing takedowns to an actual FBI subpoena.

Timestamps:
00:00 – Intro & origin story
 09:08 – Journey to $100K (SEO, growth, churn)
 32:02 – From $100K to $1M (PMF, hiring, pricing)
 43:16 – AI's impact on engineering and growth
 57:14 – Dark side of hosting: phishing, FBI, blacklists
 1:09:14 – Advice for indie hackers & closing

From building one of the first browser-based video editors to facing an existential threat from AI, Sabba breaks down the hard decisions, failed experiments, and strategic pivots that transformed VEED from a traditional SaaS company into a fast-growing AI platform.

Timestamps:
00:00 Reinventing VEED for the AI Era

02:08 AI Changed Video Creation Forever

03:32 Why Listening to Customers Can Be Dangerous

04:14 The Netflix Lesson

08:14 Building VEED's AI Video Model

09:54 Should Startups Build AI Models?

12:22 The MAGIC Framework

14:41 The Vibe Coding Boom

19:08 The Future of VEED

20:05 Outro

Three concrete ways to build a million-dollar business on the back of the vibe coding boom. Specialized AI coding tools, security, and education with live napkin math, real company examples, and keyword research throughout.

Timestamps:
00:00:00 - Intro & The Vibe Coding Opportunity
00:03:27 - Way #1: Build a "Lovable for X" (Specialized Vibe Coding Tools)
00:26:19 - Way #2: Vibe Coding Security
00:34:12 - Way #3: Education & Training
00:43:38 - Bonus: Discovery Layers & Living in the Future
00:51:12 - Wrap-up & Listener Challenge

Maria Martinez, co-founder of Tally — a bootstrapped form builder that hit over $5M ARR since 2020 — joins Sabba and Charlie to break down how she and her husband Philip built a profitable SaaS business in a fiercely competitive market. From a failed hotel marketplace idea (killed by Covid in Bangkok) to launching a Notion-inspired form builder and growing it entirely through product-led growth, Maria shares the unfiltered story of what it really takes to compete without venture capital, a sales team, or a marketing budget.

Timestamps
00:00:00 - Intro & Guest Welcome
00:00:59 - What is Tally & The Origin Story
00:07:48 - Competitive Landscape & Go-To-Market Strategy
00:11:16 - Free Tier & Product-Led Growth
00:27:00 - AI & LLM Discovery
00:34:13 - User Feedback & Metrics
00:54:27 - Life as Bootstrapped Co-founders
00:58:00 - Challenges & Churn
01:02:43 - Roadmap & Advice for Founders

A practical breakdown of churn: what it is, why it varies by market, how to tell good churn from bad churn, and the product, marketing, pricing, and activation moves that reduce it. The episode focuses on identifying sticky users, improving time to value, and designing free plans and workflows that convert better.

Timestamps:
00:00 - Intro to Churn

00:01:36 - What Churn Actually Means

00:04:15 - Good vs Bad Churn

00:10:45 - Different Types of Churn

00:12:47 - How to Reduce Churn

00:16:41 - Talking to Customers

00:24:11 - Workflow & ICP

00:26:07 - Marketing for Retention

00:34:21 - Free Plans & Pricing

00:38:32 - Activation & Time to Value

00:48:05 - Tactical Churn Fixes

00:56:43 - The Power of Negative Churn