On this page
01 How it works
SaaS means “software as a service”: people don’t buy your tool once, they pay a small monthly fee to use it in the browser. A micro-SaaS is the tiny version — one founder, one niche, one problem. Not the next big platform, but a tool that 50 or 200 customers find so useful that they pay €10–50 a month for it.
Good micro-SaaS ideas are often boring: reminders, quotes, simple reports, a checklist for one industry. Boring is good — big companies ignore these niches, and the people in them are grateful for a tool built exactly for them.
- Listen
- Validate
- Build
- Charge
- First customers
- Improve
This site was built with a lot of AI coding help — and I’m a designer, not a programmer. AI makes building fast. What it doesn’t tell you is whether anyone will pay. That part is still your job, and it’s the part most people skip.
02 Is this for you?
- know a niche or industry from the inside — your job, your hobby, your clients
- like solving problems step by step, even when things break
- can talk to strangers about their daily work without pitching
- can wait months for the first real income
- enjoy learning a bit of tech, even with AI doing most of the typing
- want money in the next few weeks
- only want to build and never talk to customers
- expect AI to deliver a finished product from one prompt
- don’t want to answer support emails
- would copy a big tool feature by feature
03 The hard part: a problem people pay for
Most micro-SaaS projects don’t fail because of bad code. They fail because nobody needed the tool. So the order is: problem → proof → product. Not the other way round.
04 What AI changes
A few years ago you needed a developer or years of practice. Today AI coding tools write most of the code, explain errors and suggest fixes. That changes who can build — but not what makes a product succeed.
05 Step by step — from idea to paying customers
All ten steps. Steps 1 to 3 cost almost nothing and decide whether you should build at all.
Start with people you understand: your old job, your hobby, your clients, your industry. Write down ten repetitive tasks these people do every week. The best ideas are hidden in spreadsheets, copy-paste and “I always forget to…”.
Not a survey — real conversations, 15 minutes each. Ask about their last week, not about your idea. Listen for time wasted, money lost and workarounds.
Build a simple page: problem, solution in one sentence, price, “join the pilot”. Send it to the people you spoke to and post it where your niche gathers. Goal: ten people who say yes to a price — or pay a small pilot fee.
Start with a clickable prototype to show your pilot users. Then build the real thing with an AI coding tool on a standard setup: login, database, payments via a provider. Build feature by feature, test each one, and save working versions so you can always go back.
Before real customers sign up: every user may only see their own data, passwords and keys never sit in the code, backups run, and you can delete an account completely. Let AI review — then check the critical points yourself or pay a developer for one hour of review.
Two ways: a payment provider like Stripe (you handle VAT and invoices), or a merchant of record like Paddle or Lemon Squeezy, which sells in its own name and takes care of VAT worldwide for a higher fee. For a one-person micro-SaaS selling abroad, a merchant of record often saves a lot of headaches.
Imprint, privacy policy, terms, and for business customers a data processing agreement. If consumers can subscribe online, add a clear cancel button. Then invite your pilot users first, fix what annoys them, and only then open to everyone.
The first 10–20 customers rarely come from ads. They come from conversations, the communities where your niche gathers, short helpful posts, and asking happy users for one referral. Do things that don’t scale — personal onboarding calls work.
Track monthly recurring revenue (MRR), cancellations (churn) and why people cancel. Talk to customers every week. After six months, decide honestly: grow it, change direction, or stop and take what you learned into the next idea.
06 Tools
Start with what you need for version 1. Most tools have free plans for testing — check current prices before you commit.
07 Realistic expectations
Many micro-SaaS projects never reach ten paying customers — usually because the problem wasn’t painful enough. Those that work often grow slowly: a few hundred euros a month after the first year is a good result for a side project. The upside: recurring income adds up, and a working tool with steady revenue can even be sold later.
What the numbers can look like — a worked example
Invented example numbers for a booking-reminder tool for dog groomers. Stripe’s standard fee for EEA cards is 1.5 % + €0.25 per payment; a merchant of record costs more (5 % + 50¢ at Paddle and Lemon Squeezy) but takes VAT off your plate. Not counted: your time for support and improvements.
08 Tips & common mistakes
- Do: Talk to customers before you build — and keep talking after launch.
- Do: Charge from day one, even pilot users. Free users tell you little.
- Do: Keep version 1 tiny: three features, done well.
- Do: Save working versions and test every change like a customer.
- Avoid: Building for months in secret, then launching to silence.
- Avoid: Copying a big tool — you can’t win on features.
- Avoid: Pasting API keys or customer data into prompts.
- Avoid: Pricing too low: €3 a month needs hundreds of customers to matter.
09 Pros & cons
- Recurring income instead of one-off sales
- Low start costs thanks to AI coding
- You own the product — and can sell it later
- Work from anywhere, any time
- Each customer adds income without much extra work
- Months before real income
- Most ideas fail at validation
- Support, bugs and updates never stop
- Security and data protection are your responsibility
- Cancellations eat growth if the tool doesn’t keep helping
10 Risks & legal
- Data protection: you need a privacy policy, and if you store data for business customers, a data processing agreement (Art. 28 GDPR). Store only what you need and choose EU hosting where possible.
- Imprint: a German business website needs an imprint (§ 5 Digital Services Act, DDG).
- Consumer subscriptions: if consumers can subscribe online in Germany, you need an easy cancel button on your website (§ 312k German Civil Code) and must respect the 14-day withdrawal right.
- VAT: once your sales of digital services to consumers in other EU countries exceed €10,000 a year, the VAT of the customer’s country applies — the One-Stop-Shop helps. A merchant of record takes this off your plate.
- AI-written code: can contain security holes. Get critical parts reviewed, keep dependencies updated, never put secrets in the code.
- Dependency: if your tool relies on another company’s API, prices or terms can change overnight. Have a plan B.
- Business registration: selling software is usually a business activity — register it and ask your tax office about the small-business VAT rule.
General information only, not legal or tax advice. Rules differ by country and change — check the official pages and ask a tax adviser or lawyer before you take real customers.
11 FAQ
Do I need to be able to code?
Not at first — AI coding tools write most of it. But you need patience, a basic understanding of how your tool works, and the willingness to test carefully. For security-critical parts, a paid review by a developer is money well spent.
How much does it cost to start?
Usually €100–1,000 in the first months: a domain, an AI coding plan, hosting and a few tools. Many services have free starter plans. The bigger investment is your time.
How long until the first money?
Plan for 3–12 months. Validation and a first version take weeks to months; then the first customers come slowly. Pre-orders or a paid pilot can bring money earlier.
Which ideas work best?
Boring, specific ones: a task that a clearly defined group does every week and hates. The more you know the niche from the inside, the better your chances.
Stripe or a merchant of record?
Stripe is cheaper per payment, but you handle VAT and invoices yourself. Paddle or Lemon Squeezy cost more but sell in their own name and handle VAT worldwide — often simpler for one person.
What should I charge?
Price by the value for the customer, not by your costs. If your tool saves a business two hours a month, €19–49 is often fine. Very low prices need very many customers.
Is AI-written code safe?
Not automatically. Let AI review security, test that users can only see their own data, and have a developer check the critical parts before real customers sign up.
Is a micro-SaaS passive income?
Semi-passive at best. It runs while you sleep, but support, bug fixes and updates never fully stop. It’s a small business, not a money machine.
The Micro-SaaS Starter Kit
- Problem finder: where niches complain + interview questions
- Validation checklist: before you write a line of code
- AI coding prompt pack: spec, build, fix, secure
- Pricing & payment provider comparison
- Launch checklist: legal pages, cancel button, data protection
- MRR tracker & churn calculator