Ka-ching!
I hadn't shipped anything in 2025 until a few days ago. My revenue has been at constant $1k/month. It's not growing. I started thinking about what to build next. I was planning something simple. I went to ahrefs, google keyword planner browsed a bit. I've had some success in images processing domain. BulkImageCrop.com and ImageCompressr.com still net most of my revenue. BulkImageResize.com also sells but that is just trickle money.
After some thought and research I made BulkWatermarks.com. You can use it to add watermark to your images in bulk. It can be a text or an image watermark. Existing solutions are expensive. They charge per image. Mine is just one time fee. So I launched it on Thursday and for first time in all my launches on prodcut hunt I got first customer on 3rd day. It's not even indexed on Google yet properly. Typically my first purchase on a product comes atleast 3 months later.
I spent $15 on domain. I've earned $29 already. If it makes $29 every year, it's a self sustaining profitable business. Life is good.