Every business idea is taken.
Good. That's the best news you'll get all week.
Pat Walls and Gus sat down on the Starter Story podcast and made the case that the smartest way to start is to copy a successful SaaS. Not invent something new. Copy something proven, change one variable, and collect a slice of a market that's already paying.
Then they backed it up with three real companies. A Calendly clone doing $5K a month. A Mailchimp clone doing over $1M a year. A Netlify clone at $400K ARR.
I watched the whole episode so you can steal the useful parts. Here's the breakdown, with the real numbers.
Saturated means validated
Pat sees hundreds of case studies come through Starter Story. His observation: the same businesses keep hitting $5K, $10K, $100K a month doing the same exact thing.
Most founders look at a crowded market and quit before starting. "There are already 40 scheduling tools, why would anyone pick mine?"
Wrong lens.
A crowded market means strangers already pull out their credit cards for this exact thing. Nobody needs to be educated. You skip the hardest part of building a company: convincing people the problem is worth paying for.
As Gus put it at the end of the episode: saturated really just means validated.
The catch: you're not trying to build the next billion dollar company. You're building the $5K to $100K a month version that lives in a corner the giant can't be bothered to defend. If you want more examples of that shape of business, I broke down a bunch in these micro SaaS examples.
Now the three clones.
Clone #1: Calday, the $5K a month Calendly
Calendly did $276M in revenue in 2023, up from $181M the year before. Pat's guess is they're past $350M now. A billion dollar business built on "pick a time slot."
Calday is the same product. Share a link, someone books a time, it syncs to your calendar. Gus tested it live on the show and booked a slot in two clicks. Pricing sits right next to Calendly's $10 per seat per month.
So how does an identical product at a similar price make $5K a month?
Marketing to a narrower person.
Calday's site doesn't say "scheduling for everyone." It targets service people: tutors, pet sitters, coaches, photographers, accountants, recruiters. There's a dedicated page for tutor scheduling. Calendly's closest page says "scheduling for education."
A tutor reads "education" and thinks: that's for universities, not me. That gap is the whole business.
Pat's point here is the one I'd tattoo on every founder's forearm: you don't need the right features, you need the right marketing of the features. Calendly almost certainly does more than Calday, feature for feature. Doesn't matter. The tutor lands on the page that speaks to tutors, signs up, and never tries anything else.
Two things this proves:
→ The TAM is absurd. Every working adult needs a calendar, most need scheduling software.
→ Distribution beats features. A niche landing page outranks a better product.
One honest caveat from me: as I write this, Calday's homepage actually 404s while the booking pages still work. That's life at the tiny end of SaaS. Small products wobble. It doesn't break the lesson, and it might even be an opening for the next person reading this.
Clone #2: Acumbamail, the Spanish Mailchimp doing $1M a year
Mailchimp hit around $800M in revenue and sold to Intuit in 2021 for $12 billion. With 1,500 employees. Bootstrapped, by the way.
Acumbamail is an email and SMS marketing platform out of Spain doing over $1M a year, per the case study submitted to Starter Story.
Their differentiator is not a feature. It's a language.
The entire product is built in Spanish first. Pricing in euros. They don't even bother auto-translating for American visitors, which Pat found hilarious. They simply do not care about you if you're not their customer.
And the math is beautiful. Gus ran it on the show: $1M a year is roughly $80K a month. If an average customer pays $500 a month (Starter Story pays $3K to $4K a month for Klaviyo, so that's not crazy for email tools), you need about 160 customers.
160 customers. To make a million a year. In a market Mailchimp supposedly "owns."
Email is also the most recession proof channel in software. Every app sends emails, every store needs campaigns, and the actual craft of turning subscribers into buyers never goes out of style. If that side of the machine interests you, this guide on lead nurturing strategies covers how businesses actually work a list from first touch to sale.
The replication paths are sitting right there:
→ Same playbook in Portuguese, French, or any language the US giants treat as an afterthought.
→ Same playbook per profession. Pat mentioned a recent case study of an email tool built just for solopreneurs.
→ Gus's bet: AI-first email marketing that writes and sends on your behalf, because the incumbents are too heavy to rebuild around it.
Clone #3: Tiny Host, the $400K ARR Netlify for normal people
Netlify did $46.3M in 2024, up from $33M in 2023. Quietly compounding while everyone talks about Vercel.
Tiny Host (tiiny.host) is hosting with everything stripped out. Drag a file in, get a live link. No terminal, no build step, no git.
The founder, Berto, shared that it's at about $400K ARR. Middle plan around $13 a month, so Pat did the napkin math live: roughly 2,500 customers. Vercel has 42,000 customers in the US alone. Tiny Host needed a fraction of that for a very nice business.
The trick is who it's for.
Scroll their site and the personas aren't developers. Sales and marketing people who want a PDF to live at a link. A real estate agent bundling three PDFs into a mini site. Designers throwing up a quick portfolio.
Netlify says "deploy your frontend stack." Tiny Host says "upload your file." Same category, different human.
And Pat's right that AI makes this bigger, not smaller. Millions of people can now generate an HTML file with ChatGPT and have zero idea what to do with it. A drag and drop host is the missing last step.
That's the part most builders can't accept. The features Netlify has and Tiny Host lacks are exactly why Tiny Host's customers pick it.
How to find your own billion dollar clone
This was my favorite part of the episode. Pat didn't hand out ideas, he showed the actual process on screen.
Step 1: Ask AI to map the targets. His literal prompt: "I want to build a bootstrapped SaaS based on a successful billion dollar B2B company with a huge TAM, attacking a smaller market. Give me the top 10 billion dollar SaaS ripe for disruption."
Step 2: Pick the one that annoys you personally. Pat skipped Salesforce (CRMs are getting eaten by AI and free tools) and went for QuickBooks, because he runs a side business and finds it too complicated. When the incumbent's own customers describe it as "built for accountants, not founders," there's your wedge.
Step 3: Drill into one feature, not the whole product. Nobody rips out QuickBooks; every accountant on earth would fight you. But single features can become products. Stripe tells you revenue but not real MRR detail. QuickBooks tells you cash flow but not MRR. Baremetrics and ProfitWell became companies in exactly that crack. Pat landed on quarterly tax reminders, a pain he literally manages with a recurring calendar event today.
Step 4: Validate on Reddit before building. Search Google for your pain plus site:reddit.com. Pat pulled up threads instantly: people writing Google Apps Scripts to remind themselves about estimated taxes, panicked "missed my quarterly payment, now what" posts in r/tax. Ten to fifteen threads like that is real demand, written by real people, in their own words.
That's the whole machine. Billion dollar company, personal pain, one feature, Reddit proof. Then build the smallest version and put a niche landing page on it, like Calday did for tutors.
If you want to go one level deeper on picking the niche itself, I wrote up niche SaaS business ideas that pair well with this method.
FAQ
Is it legal to copy a successful SaaS?
Copying an idea is legal. Copying code, design, branding, or trademarks is not. Calendly doesn't own the concept of scheduling links, and Mailchimp doesn't own sending emails. Build your own implementation, your own brand, and your own positioning. Every company in this article is a legal, independent business competing in an existing category.
Isn't a saturated market a bad sign for a new SaaS?
The opposite, if your goal is $5K to $100K a month rather than a billion dollar outcome. Saturation proves people pay for the solution, so you skip market education entirely. The failure mode isn't competition, it's cloning the giant's positioning too. Calday, Acumbamail, and Tiny Host all won by narrowing the audience, not by out-featuring the incumbent.
How do I differentiate a SaaS clone?
Pick one variable and change it. Calday changed the audience (service pros instead of everyone). Acumbamail changed the language (Spanish first). Tiny Host changed the complexity (file upload instead of deploy pipelines). Audience, language, geography, simplicity, or a single buried feature turned into the whole product. One is enough. Changing nothing is the only losing move.
How much money can a SaaS clone make?
The three in the episode span $5K a month to over $1M a year. The ceiling depends on the niche: Acumbamail needs only about 160 customers at $500 a month to clear $1M annually, while Tiny Host reached $400K ARR with roughly 2,500 customers at $13 a month. Subscription businesses compound, so today's $5K a month clone is often next year's $15K.
Stop waiting for an original idea
You don't need one. You need a proven category, one changed variable, and the patience to market it to a specific human.
The hard part is everything after: pricing it, distributing it, surviving the boring middle. That part gets easier when you hear, every week, exactly how founders one step ahead of you did it.
That's what the Profitable Founder Podcast is. Interviews with bootstrapped SaaS founders making $100K to $10M a year, including plenty who started by cloning something proven and niching down.
