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Micro SaaS ideas

Micro SaaS ideas that are already making money.

Not a list somebody wrote. 51 companies that are paying, this month, to acquire customers - with what that costs them and what the model says they earn for it.

Companies shown

51

On the index

1,400+

Median revenue

$90.6K/mo

Median ad spend

$1,201/mo

Why this list is different

Every other idea list is somebody's opinion.

Search for micro SaaS ideas and you will be handed a few hundred sentences somebody wrote down. Some of them are good. None of them tell you whether a single person has ever paid for the thing, which is the only part you cannot find out by thinking harder.

This page starts from the other end. Everything below is a company currently buying advertising - and advertising is the one business decision that cannot be faked from outside. It costs money every day, it is published by law in the EU and the UK, and nobody keeps funding it against a product that does not retain. A budget that has run for eight months is a claim with an invoice behind it.

So each row carries three numbers: what the company spends to stay visible, what the model says it earns for that, and the band around the estimate. The first is the entry price of the market. The second is the size of the prize. The third is how much of the first two to trust - the method page shows the arithmetic and names the places it breaks.

How to actually use this

Read the spend column before the revenue column. A market with a $40,000-a-month incumbent is a market with a marketing budget you cannot answer; a market where the busiest advertiser spends $1,201 is a market you can enter this quarter. Then read what the creative says: the messages an advertiser has run for months are the ones that convert, and the ones they have never run are the opening.

The cuts below exist because “ideas” is not one question. Somebody with a weekend and no budget and somebody looking for the fastest-growing market are asking different things, and each cut is drawn by a rule that is printed on its own page.

15 cuts

Pick the question you are actually asking.

Each of these is the same published sample filtered by one printed rule, so a company that leaves the corpus leaves every one of them in the same pass.

Business operations ideas people already pay for

Scheduling, inventory, invoicing - the back office, and the largest single group of advertisers in the index.

10 companies→

AI video ideas, and what they earn

Text or a photo in, a clip out - the heaviest compute in the index and the fastest-moving spend.

6 companies→

Finance and money ideas with a paying buyer

Quotes, invoices and the paperwork between them - the longest creative lifespans in the index.

6 companies→

Audio and voice ideas that are being bought

Transcription, cloning, dubbing - sold on hours saved, priced by the minute processed.

5 companies→

Marketing ideas sold to people who already buy ads

The easiest market in the index to advertise into, and the hardest to hold.

4 companies→

Sales ideas with money already moving through them

Pipelines, follow-ups, the deal that almost fell through.

4 companies→

Image and photo ideas that survived the copycats

A model doing one creative job - and the tier where competitors turn over fastest.

3 companies→

Ideas being sold on a budget one person can carry

Every published company whose advertising costs less than $1,201 a month.

26 companies→

Markets with almost nobody bidding

The tiers where fewer than four published companies are buying attention at all.

16 companies→

AI ideas with revenue behind them, not a waitlist

Every AI product in the index, priced from what it spends to acquire.

17 companies→

Ideas sold to businesses, priced from their advertising

Every published company whose buyer is another company.

25 companies→

Consumer ideas with a real subscription behind them

Every published company selling to a person rather than a company.

12 companies→

The ideas whose budgets went up this month

Every published company that increased ad spend over the last thirty days.

17 companies→

Ideas small enough to still be worth copying

Every published company modelled below $100,000 a month.

29 companies→

App ideas being paid for, not just downloaded

Every published company shipping a mobile app rather than a web product.

8 companies→

What sits behind every row

One company, and everything measured about it.

Each name on this page opens a profile with the same six things, so two ideas can be compared rather than admired.

Modelled revenue, with its band

The estimate and the range it came from. The range is wide and is printed at the same size as the estimate.

Thirty-day ad spend

Priced country by country at that market’s own CPM, never at a blended average.

The creative rotation

Every message, how long it ran, and whether it is still running. A message kept for months is one that converts.

Who it reaches

Country, age and gender mix behind the spend, as delivered rather than as targeted.

Which way the budget moved

Monthly spend history, so a good month and a trend can be told apart.

Where the model fails

Named on every page, because an estimate that will not state its own failure modes is a sales figure.

Browse the whole sampleor read how the revenue figure is built

Questions

Micro SaaS ideas, the honest version.

Including the parts this method cannot see.

What is a micro SaaS?
A software product small enough for one to five people to run - one job, done well, sold on a subscription. The distinction that matters commercially is not headcount but reachability: a micro SaaS wins a niche a larger company cannot afford the acquisition cost to serve.
How do you know these ideas actually make money?
Every company listed is buying advertising, and the spend is measured rather than estimated - Meta publishes what ran, where it was delivered and how many people it reached, and each market is priced at its own CPM. Sustained spend is the least ambiguous signal available from outside a company: nobody funds acquisition for months against a product that does not retain. The revenue figure is then modelled back from that spend and carries the band the model produced, which is wide and is not tidied up.
Is this a list of ideas or a list of companies?
Companies, deliberately. An idea with nobody selling it is a guess; an idea with three funded advertisers in it is a market with a proven willingness to pay and a visible entry price. What to build is the gap between what these companies do and what their creative says they still cannot.
What does it cost to start a micro SaaS in one of these spaces?
The median company in the published sample spends $1,201 a month on advertising while being modelled at $90.6K a month. That advertising figure is the honest entry price - not the build cost, which is your own time, but what it currently costs to be visible against the people already there.
What is not in here?
Anything that does not advertise on Meta. A product growing on SEO, word of mouth or a single viral thread is invisible to this method, and no amount of modelling fixes that. The archive also covers EU and UK delivery only, so a US-only campaign reads as zero rather than as missing - which is why every revenue figure is a band rather than a number.

The rest of the index

1,400+ products, not 51.

This page is the free sample. Behind the login the same figures cover every software advertiser we can measure, with the $500K a month ceiling marked on each one so you can see at a glance what is still enterable.

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287,014 creatives, 36 countries, no card.

Find something worth building.

1,400+ products, priced from their own advertising, and the $500K a month line marked on each one - so you can see at a glance what is still enterable.

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