Charlie Chang’s apps

Business Case Study Engine

Structure interviews into business-model and financial data.

Turns interviews and articles into structured, comparable records: the model, the numbers, the timeline and the moves that mattered. A library of case studies that can be queried rather than read.

What a v1 does5 features
  • Interviews structured into a consistent record
  • Financials extracted where they are stated
  • Comparison across businesses of the same type
  • Search by model, margin, capital or timeline
  • Sources kept against every figure

The market

Adjacent marketBusiness planning and validation
$757Ma year at Coursera, from 197M registered learners

People pay reliably to learn how to run a business, and HoneyBook's 100,000 members show they pay to run one. Paying to validate an idea before starting is much less established. These are adjacent comparables rather than direct ones, and $39 a month should be read that way.

Where these numbers come from
CompanyEarnsReachSource
LivePlanConsumer-priced SaaSNot publishedPublished pricing
Coursera$757.5M revenue, FY2025197M registered learnersPublic filings, 2025
HoneyBook$1B+ booked100,000+ membersCompany-stated

Why this audience

These viewers compare businesses constantly - which model, which margins, which is worth copying. The content gives them one at a time in prose. A structured, queryable library is what they are trying to build in their heads.

Before it can launch

No licence, certification or data agreement stands between this and a launch — app-store review and an ordinary privacy policy aside.

What it earns

Drag me Every figure recalculates as you go.

Paying users1,000

0.05% of 2M followers · capped at 50,000

Price per month$39

Opens on the price this idea was costed at, $39.

1,000 paying — 0.05% of 2M followers — × $39 a month = $39,000 a month

Paying users0123456789,012345678901234567890123456789
Revenue a month$01234567890123456789,012345678901234567890123456789
Over twelve months$012345678901234567890123456789,012345678901234567890123456789

Fifty thousand paying users is the ceiling every one of these pages is drawn against, not a forecast. It opens at a thousand, the bottom of the range, so the first figures you see are the modest ones. What the cap buys is comparability: the same range on every app, and the percentage of the audience it takes as the number that moves.

Is this the one for your audience?

We fund it, build it, and run it. You bring the audience and take a share of the revenue. Nothing to pay and nothing to build.

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