There's a category of software business that doesn't get enough attention: big enough to generate meaningful revenue, small enough for one person to build and maintain. I call it the micro-SaaS sweet spot.
It's not a lifestyle business (though it can fund a lifestyle). It's not a startup (no venture capital, no hockey stick growth required). It's something in between, and it might be the most realistic path to independence for solo builders.
What Micro-SaaS Actually Means
Micro-SaaS has a few defining characteristics:
Solves one problem well. Not a platform, not a suite. A focused tool that does one thing better than the alternatives.
Targets a specific audience, often one the big players ignore. Too small for enterprise vendors, too specialised for generic tools.
Monthly or annual subscriptions. Predictable income that compounds over time as customers stick around.
Minimal support burden. Self-serve onboarding. Infrastructure that doesn't require constant attention.
The result: a business that one person can run while maintaining sanity, often generating £5K-50K in monthly recurring revenue.
Why the Sweet Spot Matters
Most business advice falls into two camps:
Micro-SaaS sits between these. You build an asset that generates income without constant input. You maintain control. You don't need investors. And you can do it alone.
The sweet spot is where ambition meets sustainability. Big enough to matter, small enough to manage.
Finding Your Micro-SaaS Idea
Not every idea fits the micro-SaaS model. You need problems with specific characteristics:
1. Narrow Enough to Dominate
"Project management" is too broad. "Project management for wedding photographers" might work. The narrower the niche, the easier to become the obvious choice.
Can you list 100 potential customers by name? If you can't identify specific people or companies who would buy, your niche might be too vague.
2. Painful Enough to Pay
Nice-to-haves don't generate subscriptions. You need problems that cost people time, money, or sanity every week.
3. Simple Enough to Build Solo
If the MVP requires machine learning, real-time collaboration, or complex integrations, it's probably not a solo micro-SaaS. Look for problems you can solve with straightforward CRUD operations and a clean UI.
4. Sticky Enough to Retain
One-time problems make bad SaaS businesses. You want ongoing pain that justifies ongoing payment:
- Data that accumulates over time (switching costs increase)
- Workflows that repeat weekly or monthly
- Integrations with other tools they use daily
- Reporting they come back to check
The Economics of Micro-SaaS
Let's make it concrete. Here's what a healthy micro-SaaS looks like:
410 customers in a narrow niche is achievable. 12 new customers per month is about 3 per week. These are human-scale numbers.
Most solo founders underprice. At £9/month, you need 2,222 customers for £20K MRR. At £99/month, you need 202. Higher prices also filter for serious customers who churn less.
Where to Find Micro-SaaS Ideas
The best ideas come from proximity to specific industries or workflows:
What Doesn't Work
Some ideas seem like micro-SaaS but aren't:
B2C has brutal economics. Consumers expect free. Acquisition costs are high. Churn is worse.
Developers are great at building alternatives. They'll clone your product before paying for it.
Generic CRMs, to-do apps, note-taking tools. Unless you have a specific angle, you'll drown in competition.
Wedding planning, moving house. People solve these once then churn immediately.
The Path Forward
If micro-SaaS appeals to you, here's the sequence:
The micro-SaaS sweet spot isn't for everyone. It requires patience, niche focus, and comfort with "small" ambitions. But for solo builders who want independence without insanity, it might be the most realistic path that actually works.
That's the sweet spot.