Free every Sunday

Get 20 new side hustle ideas in your inbox every Sunday.

For anyone who wants a side hustle but doesn't know what yet. Or who has an idea, and no clue where to start.

  • 20 fresh ideas, sorted by cost, time and skill
  • 1 free deep dive: one idea, step by step, with the AI prompt to copy
  • The Side Hustle Starter Kit to find the idea that fits you
  • My real test results: wins, flops and every dollar. No fluff.
  • Your vote decides what I test next
This Sunday · week 1 of 52 20 ideas
  • Red-flag guides for used-car buyersUNDER $50 · BUILD ONCE
  • Kitchen paperwork for food sellersUNDER $100 · LOCAL
  • Neighborhood bite walkUNDER $50 · LOCAL
  • A bedtime story starring your childUNDER $100 · FAMILIES
  • Pilates for men is growingUNDER $100 · EVERYDAY

+ 15 more, sorted into local businesses, families, everyday life and build-once products.

Deep dive: test #01, how I'm relaunching this newsletter: every tool, cost and detour.

Budget left$5,140
Revenue$0 / $5k
Readers7,679

One test a week, $100 max, every dollar public.

01 · The challenge

52 weeks. 52 ideas. $100 each.

52tests, one every Sunday
$5,200total budget
$5k/mothe goal by Nov 2027

Every day my AI bot scans the internet for side hustle ideas. Over the next 52 weeks I'm testing the best one each week, with real money, max $100 a test.

No false promises. No fancy course. Just building something new every week and writing it all down: the steps, why I took them, what it cost and what came out of it. Plus the blueprint, so you can use it for your own next adventure.

One year from now I'm either making $5k a month… or updating my CV. Either way, you'll see every step.

Lessons from the lab

What the tests taught me so far.

Short business lessons from my own tests, written while they happen.

Lesson

Ship the ugly version first

Polish answers "is it good?". Shipping answers "does anyone want it?". Only a stranger can answer the second.

Read the lesson →

Lesson

Your next side hustle is next to what you already have

Starting next to an audience, a skill or a job skips half the work of starting from scratch.

Read the lesson →

All lessons → · Follow test #01 in the lab →

02 · What you get

Scan it in a minute. Go deep if one clicks.

The quick list comes first, so you get something useful from the first screen. The depth comes after, for the idea you actually want to try.

  1. 1 · The 20

    Twenty ideas

    Sorted into local businesses, families, everyday life and build-once products. Each tagged by cost and time.

  2. 2 · Deep dive

    One idea, step by step

    Why it works, three steps to start this Sunday, and an AI prompt to copy.

  3. 3 · The lab

    What I'm testing

    My own test of the week, with every dollar on a public scoreboard. Wins and misses.

  4. 4 · Behind the scenes

    How it's built

    The bot, the tools and the reasoning behind every choice. Copy what works.

  5. 5 · Your vote

    One click

    Tap the ideas you like. The favorites decide what I test next.

03 · The filters

Every idea passes four filters.

No vague "start a blog". If it can't be started small, it doesn't make the list.

1 day

Startable in a weekend

A first version or a first test in a day or two. No months of building.

$100

Under a hundred

Most cost nothing. None need more than $100 to test.

1 person

Just you

No team, no hardware, nothing fragile to maintain for others.

7 days

An answer in a week

Each one comes with a number to watch, so you know if it's worth continuing.

04 · Library and tools

The library is free. The tools are next.

Browse the idea library today. The tools below already run behind Sunday Lab; tell me which ones you want, and the most-wanted one opens up first.

Live

The idea library

Every idea explained in plain words: why it could work, how to start this week and the honest reason it might not. Search by topic, budget or the people you want to serve.

Free

The Side Hustle Starter Kit

Don't like my ideas? Find your own. 10 ways to spot a side hustle people already pay for, a scorecard to pick one, and a test you can run this Sunday for under $100.

In use · not public yet

The idea validator

Type in your own idea and get the full report: competitors, prices, the devil's advocate and a 7-day test plan.

Being written

The $0-down playbook

How I bought a 545,000-follower Instagram page without putting in my own money, and sold it seven years later.

In use · not public yet

Your own idea bot

A Telegram bot tuned to your profile: your skills, budget and hours. Every morning it sends the ideas that fit you best.

In use · not public yet

Growth Board

A tool to brainstorm your next moves and grow your business. It orders every idea by low cost and high impact, so you know exactly what to do next.

See all tools and vote for the one you want first →

545k → 1.3Mfollowers on the Instagram page I bought and grew
$0 downpaid back from the page's own income in 20 months
2.5×what I paid, when I sold it seven years later
$3–4k/moin royalties from AI music I promoted on my pages

05 · Who runs the lab

Hi, I'm Erwin.

Spotting a gap and building something small to test it has been the thread through everything I've done: running an event venue, starting webshops, growing an Instagram page, writing scripts that save hours of handwork, releasing AI music.

Seven years ago I bought an Instagram page with 545,000 followers without putting in any of my own money. I paid the seller back from the page's own income over 20 months. I grew it to 1.3 million followers, reinvested most of what it earned, and recently sold it for 2.5 times what I paid.

That income bought a small house in Tenerife, mostly for friends and family. It also helped me buy a house in the Netherlands, which I remodelled into two apartments: we live in one, and the rent from the other covers about 60% of our mortgage. On the side, AI music I promoted on my pages now earns $3–4k a month in royalties.

None of it started with a big idea. Each one started with a small, cheap test. That's what Sunday Lab is: I find the ideas, test the best one myself, and hand you the rest, so you can start your own.

06 · Questions

Before you join.

Is it really free?

Yes. The Sunday email, the deep dive and the idea library are free. The full research report behind an idea costs about the price of a coffee. That's optional, and the emails stay free.

Why 20 ideas?

Because one idea rarely fits everyone. With 20, sorted by cost, time and skill, there's usually one that fits you. Then one gets the full step-by-step treatment.

Do I need tech skills?

No. At least a third of every list needs no tech skills at all. Where AI helps, you get the exact prompt.

Can I build one of your ideas?

Please do. That's the point. If you do, tell me how it went: erwin@sundaylab.co.

None of the ideas fit me. Now what?

Get the free Side Hustle Starter Kit. It shows you how to find your own idea, one that people already pay for.

Where do the ideas come from?

A research bot reads startup, AI and side-hustle newsletters and trend signals every day. I pick, rewrite and check them, and link the source.

07 · Join

20 new side hustle ideas, every Sunday, in your inbox.

Plus one deep dive, and a front-row seat to the challenge.

Sign up at the top of the page →