Mark Tilbury’s apps

Compound Growth Tracker

Show how consistent small investments can compound over years.

Shows what regular investing turns into over decades, using the user's real numbers rather than a marketing example. It exists to make the boring option feel like it is doing something.

What a v1 does5 features
  • Projections from actual contributions and balance
  • The compounding curve shown year by year
  • What one extra ten dollars a week changes
  • Inflation shown alongside, so the figure is honest
  • Milestones - the first year the returns beat the contributions

The market

Adjacent marketPortfolio tracking
$24 a monthcharged by Sharesight, used by investors in over 100 countries

No portfolio tracker publishes revenue or user numbers, so price is the only available evidence. Sharesight charges $24 and Snowball Analytics $299 for professional use. At $4 a month this sits below both.

Where these numbers come from
CompanyEarnsReachSource
Sharesight$24/mo PremiumHundreds of thousands of investors, 100+ countriesPublished pricing
Snowball Analytics$12.50 per 10 portfolios · $299/mo proNot publishedPublished pricing
EmpowerWealth-management upsellNot publishedModel, not a disclosed figure

Why this audience

Compounding is the recurring subject here and the audience believes in it in the abstract. What sustains the behaviour is seeing it happen to their own balance. Making the boring option visibly work is what keeps them doing 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.

What it earns

Drag me Every figure recalculates as you go.

Paying users1,000

0.005% of 20M followers · capped at 50,000

Price per month$4

Opens on the price this idea was costed at, $4.

1,000 paying — 0.005% of 20M followers — × $4 a month = $4,000 a month

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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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