Charlie Chang’s apps

3 Things + Calendar

Automatically block calendar time around the three priorities.

The three priorities, with time actually booked for them. It finds the space in the calendar, blocks it before the day fills, and moves the block rather than dropping it when something collides.

What a v1 does5 features
  • Time blocked automatically for each of the three
  • Blocks placed where the person actually works well
  • Collisions rescheduled rather than cancelled
  • The calendar shown as the priorities, not as meetings
  • Two-way sync with the existing calendar

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 $6 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

This audience already knows the priorities and still lets the calendar fill with everybody else's requests. Deciding is not their problem; defending the time is. Booking the block before the day fills is the missing half of a habit they already have.

Before it can launch

  • Google Calendar restricted scopes - an annual CASA Tier 2 security assessment, renewed every year the app keeps the scope

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$6

Opens on the price this idea was costed at, $6.

1,000 paying — 0.05% of 2M followers — × $6 a month = $6,000 a month

Paying users0123456789,012345678901234567890123456789
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.

Also for Charlie Chang

All 43 for Charlie Chang