Collection · 8 ideas
Best with zero startup cost
Nothing to buy before the first sale. The cost is your time, a skill you already have, or something you already own. If an idea here asks you to pay for a course first, that's a different idea, and probably a worse one.
Updated 1 Sep 2026
- Technical writing for developer tools
If you can write and you've used a developer tool in anger, you already have the portfolio: write one doc page and show it.
$0weeksreplaces a job
- Resume rewriting for people in your former industry
Your old job is the credential. Nobody rewrites a nurse's resume better than an ex-nurse who can write.
$0dayspocket money
- Tutor high-school maths or a language
Demand is permanent and parents pay on time. Start with the school subject you were actually good at.
$0daysside income
- Run a paid study group for a professional exam you passed
You passed the exam. That's the product. The cost is a video call link.
$0weekspocket money
- Dog walking and drop-in pet visits
Recurring clients, weekday daytime, and people trust you with their dog before they trust you with anything else.
$0dayspocket money
- Sell spreadsheet templates for one specific profession
The slowest entry here, but the one that keeps paying after you stop working on it.
$01-3 monthsside income
- Work as a paid election poll worker
A few long days a year, fixed pay, no selling. Included because it's real and nobody mentions it.
$0dayspocket money
- Substitute teaching
Requirements vary by region but often stop at a degree and a background check. Flexible, and the demand is desperate.
$0weeksside income