Overview
People in the tech circle often mention SaaS, saying businesses are all using it. So what exactly does SaaS mean? In fact, SaaS technology has long been integrated into work and daily life. In a single sentence: SaaS is renting software rather than buying it to own.In the past, using software was like buying a car. A company installing a financial system had to purchase a license upfront, buy servers, set up a server room, and hire people to maintain it. For individuals, using design software meant downloading multi-gigabyte installation packages that ate up computer memory, and updates required manual patching.
Now it's completely different. WPS Online Docs that you can use in a browser, team collaboration tools like Feishu and DingTalk, and design platforms like Canva — all of these are SaaS. You don't need to worry about servers. You pay a monthly or yearly "rental fee" to use them. It's like using Didi — you don't need to buy a car, but you can get one whenever you need it. Simply put, any software that requires no download or installation, is paid for by usage, and is maintained by the provider is SaaS.
Behind SaaS: A "tap water-style service logic"
This model seems simple, but it actually operates on a "cloud hosting + on-demand allocation" system — like giving software a "shared butler":
Cloud hosting: The provider has already installed the software on their own servers. You only need to "connect" to it through a browser or mini-app to use it, and data is also stored in the cloud. It's like a water company building a water plant — you don't need to dig your own well or store water.
Usage-based billing: Pricing is very flexible. Small teams using DingTalk pay based on the number of active users. Email marketing tools charge based on send volume. Some tools like Basecamp charge a fixed monthly fee regardless of company size. It's like paying for water by usage — no unnecessary overspending.
Automatic maintenance: Software updates and bug fixes are quietly handled by the provider in the cloud. The next day you log in, you're already on the latest version. No need to shut down and install patches — it's like having a plumber who comes to fix things without you even noticing.
Cross-platform compatibility: Since data is stored in the cloud, you can start a document on your work computer and continue editing it on your phone at home. Multiple people can collaborate in real time — something traditional software could never do.
For example, when a company uses a SaaS CRM to manage customers, sales staff can fill in follow-up records on their phones while out in the field. The data automatically syncs to the office for colleagues to see, and the provider automatically backs up the data weekly. Even if your computer breaks, nothing is lost — and the company IT department doesn't have to worry about it.
Many common tools are SaaS
Don't think SaaS is only for businesses — many personal tools work the same way:
Office tools: Feishu Docs and Tencent Docs let you edit in real time with others without installing Office. Shimo Sheets auto-calculates data and lets you add comments for feedback.
Design tools: Canva lets you design posters with drag-and-drop — no need to learn Photoshop. Figma lets you collaborate with teammates on UI design in real time.
Business tools: Small shops can use Youzan to set up an online store without building a website from scratch. Sales teams use Salesforce to track customer info and automatically assign leads.
Lifestyle tools: Even gym booking systems and nail salon membership management tools are often powered by SaaS behind the scenes — owners don't need to understand tech to run their business.
