21st Loop

For app founders · iOS · Android · Web

You build the app.
We figure out how to grow it.

The workflow researches what to try, builds the strategy, and turns it into social content or creator outreach.

Early access · Nothing runs until you press start

01/ 04

The other job

Shipping is one job.
Finding users is six more.

Most app founders squeeze these into the gaps between commits. The workflow takes all six — and turns them into one loop.

paywallwidgetv1.4 — your week: buildResearch the marketFigure out what to tryMake the contentFind creatorsWrite the outreachTrack what worked

02/ 04

Two ways to reach people

Strategy picks the route.
Both come back to the same loop.

Find the anglePrepare contentAdd your videoCopy per platformReady for youFind creatorsCheck the fitShortlistPrepare outreachReady for youSocial contentCreatorsStrategyApproval · youGO LIVE → LEARN

Not two tools. Two routes inside one Growth journey — one place to approve, one record of what happened.

03/ 04

The product, mid-loop

Watch one loop move.
From research to a post you approve.

Tempo · iOS ▾Pace · weekly

RP-000214 · social content

Streak-reveal clip for the 1.4 widget

✓ Research · ✓ Strategy · ✓ Prepare · ◆ Your turn

12-day streak

▶ 0:24

Why this

Streak reveals come up often in habit-app content. 1.4's widget is a real reason to post.

✓ Video attached

Day 12. The widget shows your streak without opening the app — built it in a weekend. Tempo 1.4 is out.

#buildinpublic #habits #iosapp

Publishing to TikTok @tempoapp · Instagram @tempo.app

Approve & publishAsk for changes

Example

Same loop, other route

The last cycle went to a creator.

Found, fit-checked, outreach prepared. You reviewed the message; the platform sent it and tracks the reply.

@studywithmaya

YouTube · study routines & productivity

Replied · interested

Why she fits

Her viewers are students building daily study habits — the people Tempo is for.

Outreach you approved

“Tempo × your study-routine videos” — a short note offering early access and a partnership.

✓ Identified✓ Fit checked✓ Outreach ready✓ Reviewed by you✓ SentReply tracked

04/ 04

The loop learns

It remembers what worked.
Every try leaves a note for the next one.

A while ago

We wrote to a few YouTubers who make study videos.

Two wrote back — one wanted to work together.

Note kept · Creators say yes faster when there's a short demo clip to share.

Last time

We posted a short demo of the app on TikTok and Instagram.

In the comments, people kept asking about one feature: the widget.

Note kept · People love the widget — talk about it first.

This time

Both notes read first — so this idea starts ahead.

A new clip that opens with the widget — plus a version creators can share.

Waiting for your approval

Every note comes from something real — replies, comments, and the numbers the platforms report. Nothing is guessed twice, and you can read every note yourself.

Try the Growth
workflow.

Add your app. Start your first loop when you're ready.

New workspaces include Managed AI and free Growth Cycles to get started. No credit card and no API key required.

Early access · For iOS, Android and web apps

At: 01 · The other jobTry free