Michael Koper
@michaelkoper.com
Dad of two - Founder of https://nusii.com - Bootstrapper - Ruby on Rails
Pinned
Michael Koper
@michaelkoper.com
· Oct 22
Hello again!
We are doing introductions?
I'm Dutch living in Madrid, Spain. I have been working on my own startup Nusii (online proposal software) for 10 the last 10 years.
I recently started to do some temporary freelancing on the side just for fun.
I like playing the drums 🥁
We are doing introductions?
I'm Dutch living in Madrid, Spain. I have been working on my own startup Nusii (online proposal software) for 10 the last 10 years.
I recently started to do some temporary freelancing on the side just for fun.
I like playing the drums 🥁
This summer I had a lot of trouble because of spammers signing up with stolen credit cards.
Glad all the work paid off, no more spammers anymore! And soon as they managed to come in, they are blocked almost immediately 👌
And next time they try, they need a new ip, working email and credit card.
Glad all the work paid off, no more spammers anymore! And soon as they managed to come in, they are blocked almost immediately 👌
And next time they try, they need a new ip, working email and credit card.
September 16, 2026 at 9:05 AM
This summer I had a lot of trouble because of spammers signing up with stolen credit cards.
Glad all the work paid off, no more spammers anymore! And soon as they managed to come in, they are blocked almost immediately 👌
And next time they try, they need a new ip, working email and credit card.
Glad all the work paid off, no more spammers anymore! And soon as they managed to come in, they are blocked almost immediately 👌
And next time they try, they need a new ip, working email and credit card.
Besides it is the way non technical connect your app to Claude/ChatGPT, I think MCP's best feature is, that gives a new description every time it reconnects. So you don't have to worry about versioning. Everyone has the newest version all the time, and the agent knows how to use it constantly.
September 15, 2026 at 11:58 AM
Besides it is the way non technical connect your app to Claude/ChatGPT, I think MCP's best feature is, that gives a new description every time it reconnects. So you don't have to worry about versioning. Everyone has the newest version all the time, and the agent knows how to use it constantly.
guess you get this a lot @tylerking.app. Last week, a customer told me the path he took before signing up for Nusii.
He was using HubSpot for $2,000/month, with way too many products, and finally got frustrated and left. He went with Less Annoying CRM simply because he thought the name was funny 😂
He was using HubSpot for $2,000/month, with way too many products, and finally got frustrated and left. He went with Less Annoying CRM simply because he thought the name was funny 😂
September 12, 2026 at 7:09 PM
guess you get this a lot @tylerking.app. Last week, a customer told me the path he took before signing up for Nusii.
He was using HubSpot for $2,000/month, with way too many products, and finally got frustrated and left. He went with Less Annoying CRM simply because he thought the name was funny 😂
He was using HubSpot for $2,000/month, with way too many products, and finally got frustrated and left. He went with Less Annoying CRM simply because he thought the name was funny 😂
I'm somewhere in the centre, and it is very tiring to hear both sides screaming past each other all the time. It's like being at a concert with two bands on opposite sides playing different songs: one plays death metal, and the other reggaeton.
September 12, 2026 at 10:53 AM
I'm somewhere in the centre, and it is very tiring to hear both sides screaming past each other all the time. It's like being at a concert with two bands on opposite sides playing different songs: one plays death metal, and the other reggaeton.
Brutal. Just calculated the cost for all my Appsumo users. Server, DB, emails, asset hosting, and customer service ($50/hour, 10 minutes per ticket).
Appsumo users cost me $203/month
server/monitoring, storage, emails sending, and customer support.
Appsumo users cost me $203/month
server/monitoring, storage, emails sending, and customer support.
September 8, 2026 at 10:43 PM
Brutal. Just calculated the cost for all my Appsumo users. Server, DB, emails, asset hosting, and customer service ($50/hour, 10 minutes per ticket).
Appsumo users cost me $203/month
server/monitoring, storage, emails sending, and customer support.
Appsumo users cost me $203/month
server/monitoring, storage, emails sending, and customer support.
SaaS is great! I just calculated my profit margin and it is 92.5%
Each customer I add, it stays at 92.5%. This included doing customer support at $8.33 a ticket.
Each customer I add, it stays at 92.5%. This included doing customer support at $8.33 a ticket.
September 8, 2026 at 9:55 PM
SaaS is great! I just calculated my profit margin and it is 92.5%
Each customer I add, it stays at 92.5%. This included doing customer support at $8.33 a ticket.
Each customer I add, it stays at 92.5%. This included doing customer support at $8.33 a ticket.
Just sent 20 users a price increase email. Not my fav task!
September 8, 2026 at 6:39 PM
Just sent 20 users a price increase email. Not my fav task!
NERVOUS!!! I don't want to say why yet, I will say why somewhere next week 😅 I will do something way out of my comfort zone, I think it is probably the most out of the comfort zone I've ever been.
September 7, 2026 at 10:29 AM
NERVOUS!!! I don't want to say why yet, I will say why somewhere next week 😅 I will do something way out of my comfort zone, I think it is probably the most out of the comfort zone I've ever been.
This is what success looks like, went shopping today in these bad boys (socks included)
September 4, 2026 at 9:04 PM
This is what success looks like, went shopping today in these bad boys (socks included)
It is time to return to hard work mode again. From now on, I'm trying to book a call with every single signup. Do some research, send them a personal, non-automated email, and connect on LinkedIn.
The goal is to get as much information about them as possible and eventually help them.
The goal is to get as much information about them as possible and eventually help them.
September 4, 2026 at 11:08 AM
It is time to return to hard work mode again. From now on, I'm trying to book a call with every single signup. Do some research, send them a personal, non-automated email, and connect on LinkedIn.
The goal is to get as much information about them as possible and eventually help them.
The goal is to get as much information about them as possible and eventually help them.
I think the hardest part right now is that spammers simply sign up (it might be via AI, but that’s hard to measure) with stolen credit cards. So you have to block accounts based on their behavior without blocking legitimate accounts.
I've been fighting spammers for Nusii some time now and I'm enjoying it. If I ever consult again, then this would be one of my niches.
September 2, 2026 at 1:16 PM
I think the hardest part right now is that spammers simply sign up (it might be via AI, but that’s hard to measure) with stolen credit cards. So you have to block accounts based on their behavior without blocking legitimate accounts.
I've been fighting spammers for Nusii some time now and I'm enjoying it. If I ever consult again, then this would be one of my niches.
September 2, 2026 at 12:55 PM
I've been fighting spammers for Nusii some time now and I'm enjoying it. If I ever consult again, then this would be one of my niches.
This makes it also very easy to automatic block accounts that use the same CC fingerprint as an already blocked account.
Attempt number 151 fighting spammers. Save the credit card fingerprint in the database and grouping accounts where a credit card is reused. Spammers love to reuse stolen credit cards.
September 2, 2026 at 12:14 PM
This makes it also very easy to automatic block accounts that use the same CC fingerprint as an already blocked account.
Attempt number 151 fighting spammers. Save the credit card fingerprint in the database and grouping accounts where a credit card is reused. Spammers love to reuse stolen credit cards.
September 2, 2026 at 8:26 AM
Attempt number 151 fighting spammers. Save the credit card fingerprint in the database and grouping accounts where a credit card is reused. Spammers love to reuse stolen credit cards.
Got a new device to annoy people!
August 30, 2026 at 9:36 AM
Got a new device to annoy people!
What is the deal with all the CEOs of AI companies acting like little babies.
August 29, 2026 at 9:28 AM
What is the deal with all the CEOs of AI companies acting like little babies.
Ahhh, so this is what they meant by, fighting spam is an ongoing battle...
August 27, 2026 at 2:12 PM
Ahhh, so this is what they meant by, fighting spam is an ongoing battle...
One tip if you want to go on holiday in Spain but you don’t like overly expensive, packed tourist places. Go to a town that doesnt have a beautiful sand beach. You mostly see Spanish tourists here, housing is twice as cheap, village is just as nice as famous places.
August 21, 2026 at 1:35 PM
One tip if you want to go on holiday in Spain but you don’t like overly expensive, packed tourist places. Go to a town that doesnt have a beautiful sand beach. You mostly see Spanish tourists here, housing is twice as cheap, village is just as nice as famous places.
First time at a Spanish outside summer night cinema! It was really cool! The movie not so much tho 🤣
August 18, 2026 at 7:39 AM
First time at a Spanish outside summer night cinema! It was really cool! The movie not so much tho 🤣
Really liked this episode. I read Steve's Kill the Hippo book and it was a great read. I expected it to be boring because it is about features, but same as in this podcast episode, it cuts right through the bullshit of most of the feature frameworks, almost no real businesses actually uses.
Oh look I’m on a podcast talking about my book, my company, and how much harder it is to get a bootstrapped SaaS off the ground these days.
overcast.fm/+AAECTDTh118
overcast.fm/+AAECTDTh118
RS360: Kill the Hippo — Rogue Startups
If you’re building a SaaS company, one of the hardest questions you’ll face isn’t how to build a product. It’s what to build next. In this episode of Rogue Startups, Craig Hewitt talks with Steve McLe...
overcast.fm
July 30, 2026 at 1:23 PM
Really liked this episode. I read Steve's Kill the Hippo book and it was a great read. I expected it to be boring because it is about features, but same as in this podcast episode, it cuts right through the bullshit of most of the feature frameworks, almost no real businesses actually uses.
From ~4000 free accounts, ~400 are still active. 56 of them showed interest in being on our MCP beta program.
That is 14% and much more than I would expect! A lot more interest than our public API ever had.
Not saying API was a bad move, those accounts are super sticky and don't churn that much.
That is 14% and much more than I would expect! A lot more interest than our public API ever had.
Not saying API was a bad move, those accounts are super sticky and don't churn that much.
July 24, 2026 at 3:09 PM
From ~4000 free accounts, ~400 are still active. 56 of them showed interest in being on our MCP beta program.
That is 14% and much more than I would expect! A lot more interest than our public API ever had.
Not saying API was a bad move, those accounts are super sticky and don't churn that much.
That is 14% and much more than I would expect! A lot more interest than our public API ever had.
Not saying API was a bad move, those accounts are super sticky and don't churn that much.
Just hung up this painting in our new living room. I've been looking at it every day for the past 7 years, and I still love it. It's one of my favorite paintings. 👍
July 23, 2026 at 11:33 AM
Just hung up this painting in our new living room. I've been looking at it every day for the past 7 years, and I still love it. It's one of my favorite paintings. 👍
I always try to share this important message to the world. If you work hard enough, you could be as lucky as I am and being able to buy the car of your dreams 👌💰💰
July 23, 2026 at 8:08 AM
I always try to share this important message to the world. If you work hard enough, you could be as lucky as I am and being able to buy the car of your dreams 👌💰💰
see indie hackers make this mistake all the time.
The advice is: solve your own problem, then find more people like you.
The problem? You probably wouldn't pay $50/month to solve that problem, so people like you probably won't either.
The advice is: solve your own problem, then find more people like you.
The problem? You probably wouldn't pay $50/month to solve that problem, so people like you probably won't either.
July 21, 2026 at 2:58 PM
see indie hackers make this mistake all the time.
The advice is: solve your own problem, then find more people like you.
The problem? You probably wouldn't pay $50/month to solve that problem, so people like you probably won't either.
The advice is: solve your own problem, then find more people like you.
The problem? You probably wouldn't pay $50/month to solve that problem, so people like you probably won't either.