Mark Tilbury’s apps

$5-a-Day Investing App

Turn small daily amounts into automatic investments rather than leaving money in a bank account.

Small daily amounts moved into the market automatically, because the sum people can commit to daily is one they never get round to doing monthly. Custody and execution sit with a broker-dealer partner.

What a v1 does5 features
  • A daily amount, moved without being thought about
  • Fractional shares, so five dollars actually buys something
  • Round-ups from spending as an optional top-up
  • Progress shown as shares owned rather than as a balance
  • Pause without penalty, resume without resetting

The market

Proven marketMicro-investing
$400Ma year at Acorns, from 14M customers

Acorns is the evidence that a subscription rather than trading commission can carry a consumer investing product, with over $30B invested since inception. This is costed at $5 a month.

Where these numbers come from
CompanyEarnsReachSource
Acorns$400M+ annual revenue, 202514M+ all-time customers · $30B+ investedIndependent estimate
Stash$37.5M Series D raisedNot publishedAnnounced funding
Greenlight$2B managed by kids6.5M+ usersCompany-stated, 2024

Why this audience

This audience has been shown that small consistent amounts beat occasional large ones, and the sum they can commit to daily is one they never get round to monthly. The lesson has landed; the mechanism has not. Automating the daily amount is the missing execution.

Before it can launch

  • A FINRA-member broker-dealer partner to hold custody and execute the daily buys

How the pricing works

Five dollars a month against roughly $150 a month invested. The tempting model is a percentage of assets, which is an advisory fee, and an advisory fee needs RIA registration.

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$5

Opens on the price this idea was costed at, $5.

1,000 paying — 0.005% of 20M followers — × $5 a month = $5,000 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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