Erika Kullberg’s apps

4-Day Financial Playbook App

Turn a four-day financial playbook into an interactive step-by-step program.

A four-day programme turned into four days of actual work: one task a day, done in the app, with the accounts connected so each step ends in something changed rather than something understood.

What a v1 does5 features
  • One focused task per day, sized to under an hour
  • Steps completed against real linked accounts
  • Progress saved, so a missed day does not restart it
  • A finish state - what was changed over the four days
  • A follow-up check a month later

The market

Proven market
10M membersat Rocket Money, which charges for budgeting and bill management

Monarch has roughly 1.8M monthly users and YNAB about 1.4M, at $99.99 and $109 a year. Mint's closure left the largest gap in consumer finance and three paid products grew into it. This is sold once for $19, less than a fifth of what either charges for a year.

Where these numbers come from
CompanyEarnsReachSource
Rocket Money$880M+ saved for members10M+ membersCompany-stated, 2025
Monarch Money$99.99–199 a year~1.8M monthly active usersPublished pricing, 2026
YNAB$109 a year~1.4M monthly active usersPublished pricing, 2026

Why this audience

These viewers follow step-by-step financial programmes and finish the video without finishing the steps. The content is explicitly programmatic. Turning a four-day playbook into four days of actual work closes the gap between watching and having done it.

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.

How the pricing works

A four-day programme is finished in four days, so it is sold once rather than subscribed to. The projection assumes one purchase per buyer per year, which is generous - most buy it once, full stop.

What it earns

Drag me Every figure recalculates as you go.

Paying users1,000

0.0047% of 21.2M followers · capped at 50,000

Price per use$19

Opens on the price this idea was costed at, $19.

Purchases per user per year1

A quarter is one purchase every four years; twelve is monthly.

1,000 paying — 0.0047% of 21.2M followers — × $19 × 1 purchases a year = $19,000 a year

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Revenue a month$0123456789,012345678901234567890123456789
Over twelve months$01234567890123456789,012345678901234567890123456789

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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