Charlie Chang’s apps

Personal Productivity OS

Broader productivity system combining priorities, calendar, deep work, AI, routines, and commitments.

The full system rather than one habit: priorities, calendar, deep work, routines and commitments in one place, for somebody who wants one tool rather than five that nearly integrate.

What a v1 does5 features
  • Priorities, calendar and tasks in one model
  • Routines and habits alongside the work
  • Deep work measured as part of the same system
  • A weekly review that covers everything at once
  • One place to look, rather than five that nearly sync

The market

Proven marketTask and daily planning
50M usersat Todoist, of whom roughly 300,000 pay

That is about 0.6% conversion at the most successful independent task manager there is. Motion went from $2M to $50M in under two years charging $19 to $34 a month, and Sunsama charges $16 to $20. At $12 a month this is priced below both.

Where these numbers come from
CompanyEarnsReachSource
Todoist$26.5M a year50M+ users · ~300k paying customersIndependent estimate
Motion$2M to $50M ARR in under two yearsNot publishedIndependent estimate
Sunsama$16–20/moNot publishedPublished pricing, 2026

Why this audience

These viewers have assembled a stack of five apps that nearly integrate and spend real time maintaining it. The content pushes systems thinking. One model covering priorities, calendar and routines is what they have been trying to build themselves.

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$12

Opens on the price this idea was costed at, $12.

1,000 paying — 0.05% of 2M followers — × $12 a month = $12,000 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.

Also for Charlie Chang

All 43 for Charlie Chang