Niall Doherty's Blog, page 27
March 10, 2025
Started His $19K/Month Business From a Barber’s Chair
Maciej CupialFounder of Calendesk $19,000 monthly revenue
An interview with Maciej Cupial from Poland, founder of Calendesk…
Origin story…
I started Calendesk in 2020/2021 after a conversation with my hairdresser, who was struggling to manage bookings efficiently.
He wanted a simple tool but couldn’t find one that fit his needs. Given my programming background, I thought, “Why not build a solution myself?”
How Maciej validated the idea…
Instead of trying to build the “perfect” SaaS, I decided to launch quickly and get feedback from real users. So, I created a landing page with a clear CTA, launched Google Ads to drive traffic, and offered a free beta to early users.
I love how he got the idea by talking with his hairdresser 
Similar story with this person on Reddit: I made $450 off one client!
Try to strike up conversations with business owners you interact with, learn what problems they have, see if you can provide a solution (doesn’t have to be software).
Simple Amazon Word Search Books Earning $100’s Per Day
Easter Basket StuffersBook $273-488 estimated daily revenue
Sean Dollwet posted this video a year ago about publishing low-content books on Amazon…
At the start he shows examples of kids word search books on Amazon + estimated earnings 
Sean’s video was posted right before Easter and those are all Easter-themed books, so earnings were likely peaking around then 
Greg Gottfried has a more recent video on the same topic where he says…
This is the inside of [my Amazon KDP] account… in the first month it has made $7.89, and that is only with seven of these books uploaded.
This was just a couple hours of work total… no advertising, no marketing… these books are just selling on their own.
$7.89 ain’t a lot but also not a bad start, could see that increasing over time 
A full hour-long tutorial from Greg where he breaks down how to do this…
How to Start Amazon KDP in 2025 (Beginner Tutorial)His Directory Website SaaS Made $10K in 45 Days
SergFounder of Directify $10,000 revenue in 45 days
Serg from Armenia tweets…
Larafast made its first $10K in – 54 days
Directify made its first $10K in – 45 days
My other projects never crossed $200.
Just keep trying.
Directify lets you…
Create a Directory Website with No-Code
Serg shares more about how he’s growing it here 
A few directory site success stories and ideas I’ve shared previously…
2-Year-Old Directory Site Makes $3500 Per MonthOne Of These 5 Directory Sites Earns $14M Per YearJuicy Keyword: Fitness With Childcare$1000+ From His Simple Black Friday Directory SiteQuick Website Earned Him a Quick $25,0001000’s of Monthly Searches + Low Keyword DifficultySounds like Directify makes it quick and easy to create those kinds of sites.
There’s a 7-day free trial if you want to test it out 
$145 in 1 Day Reselling Free Items On Facebook (With AI)
Codie SanchezSerial Entrepreneur $145 revenue in 1 day
New video from Codie Sanchez…
Similar to another story we featured recently, she’s using ChatGPT Operator to find free items listed on Facebook Marketplace, get them delivered to her home, then selling them for a profit 
In one day, she ended up selling a chair, a table and a stroller for $145 total…
If we keep doing this for a week, that’s $1015, not bad at all.
But Codie doesn’t mention her expenses, which include $200/mo for Operator, and $100+ for delivery of just one item 
She also admits there was a good bit of “babysitting” of the AI required, but that is likely to change soon…
In the next 5 years, I think this game is completely different. Which is why we have to learn this stuff now.
My main takeaway: reselling free items on Facebook Marketplace can be a profitable side hustle if you do the pickup and delivery yourself 
And as AI improves you can increasingly automate everything else.
March 6, 2025
Passive Income Ideas Database
All Ideas
Passive Income Ideas
SaaS Ideas
Side Hustle Ideas
Low Tech Ideas
AI Ideast>","ordering":false}" data-filters="{"tags":{"taxonomy":"post_tag","heading":"Tags","terms":[{"name":"passive income","slug":"passive-income"}],"searchColumn":"hf_tags"}}" data-order='[[0, "desc"]]'>DateTitleIdea SummaryTagshf:tags
$515 Already From His Plumbing Job Board
RomelOwner of PlumbingJobs.com $515 revenueRomel, the owner of PlumbingJobs.com reports that he launched the site last October and it has earned $515 so far via premium listings…
I’m not a very technical guy and I don’t know how to code. So the best way for me was learning to build [the site] using WordPress through YouTube.
But Romel didn’t start completely from scratch: he bought the PlumbingJobs.com domain, probably for a few $1000
And that domain was host to a plumbing job board previously, so it likely had some SEO juice.
Still, his success tells me that there could be a job board like this for every profession.
Further proof via another Redditor who writes…
I’ve successfully built small-scale job boards that generate passive income…
$3,000 to $4,000 monthly [revenue] per niched job board. We have built a system that automates the entire process.
Check if there’s already a go-to job board for a niche you’re interested in.
If not, how about building it yourself? 
$200-400 Per Night From an Old Polaroid Camera
u/SolarCuriosityRedditor $300 average nightly revenueSomeone asked on Reddit…
What’s the most unexpected side hustle that actually made you money? One reply…
I found an old Polaroid camera when I was cleaning my grandparent’s place and walked around downtown and offered to take people’s picture for $5.
For some reason people love the nostalgia of a Polaroid physical picture. I would make anywhere from $200-400 per night.
I could see this being a profitable side hustle in tourist areas. Hang out in front of popular landmarks and offer to take cute photos 
The same person says they also tried the piano removal business idea I covered a few weeks back, made some money doing that, too.
He Sold His Daily Challenge Website for $50,000
Florin PopFounder of iCodeThis.com $117,000 revenue Florin Pop writes…
I sold my first SaaS, iCodeThis.com, for $50,000!
Origin story…
Back in December 2022, I wanted to build a daily coding challenge platform for frontend developers. The goal was to create real-world challenges that would help devs improve their skills by building something, not just watching endless tutorials…
The platform started as a free challenge site, but I later introduced different paid tiers
Florin earned $67,000 from the project during the two years he ran it, and sold when he started feeling burned out.
So $117,000 total revenue from the project in 2 years
I’m thinking this could work for other industries / professions…
real-world challenges that would help [target audience] improve their skills by building something, not just watching endless tutorials.
Two of the many suggestions ChatGPT gave me
10 Simple GPT Ideas That Can Turn Into Million $ Startups
metaschool tweets…
Most people think you need a genius idea to make $1M with AI.
The truth? The simplest businesses make the most money.
Here are 10 simple GPT ideas that can turn into million-dollar startups
#5 on the list
CryptoTaxGPT: Create a GPT that calculates crypto taxes by country.
Go to Market
– Tweet tax facts on Bitcoin.
– Post thread on r/CryptoCurrency.
– Chat on X Spaces with influencer.
metaschool also has a waitlist open for Build That Idea…
A platform that lets anyone launch their own AI agent in 60 seconds
– Define your Agent
– Choose a base LLM (OpenAI, Claude, DeepSeek, etc.)
– Upload knowledge base
– Set pricing and start making money
Worth keeping an eye on
1-Year-Old Websites Making Up To $100K Per Month
DuolingoGuides.comWebsite $10,500 estimated monthly revenueIn a new video, Spencer Haws breaks down 4 websites that are making big money despite being less than a year old …
The second is the most interesting to me: an independent blog providing tips, hacks, and reviews for the popular Duolingo language-learning app 
Monetized with display ads, ranking on Google for queries like…
duolingo promo codehow much is super duolingoduolingo levels Spencer comments…
I love this example because it takes a larger brand or trend and capitalizes on it.
What large company or business could you become an expert on and ride their coattails to $10,000 per month?
