When we were running our consulting business, we kept running into the same problems over and over again. We couldn't find any tool that fits to our needs. While consulting others we saw that other companies we worked with had the same issues.
At first, we tracked everything manually in Google Sheets (yeah, not ideal). As things grew, it didn't work anymore. Most tools we tried were either way too complex or way too simple. We didn't need a full ERP, we just needed solid tool for time tracking and to send invoices without extra hassle.
We did not find a tool that worked the way we needed. So now we're building it.