Your developer says the new app should "run on Kubernetes", and the quote now has extra lines for cluster setup and monthly cloud fees. Another developer says Docker alone is enough. You are stuck in a Kubernetes vs Docker argument you never asked for, with your money on the line.
This guide explains both tools without code. It shows what each one does, why they are not really rivals, and how to tell whether your app needs Kubernetes at all. For most small and mid-size business apps, the honest answer is no, at least not yet.
Quick answer
Kubernetes vs Docker: what is the difference?
Docker builds and runs containers. Kubernetes manages many containers across many servers. They work at different levels, so the real question is not which one is better, but whether your app has grown big enough to need a manager for its containers.
Think of Docker as the standard shipping container, and Kubernetes as the port that decides which ship each container goes on. A small shop with a few boxes does not need a port.
| Docker | Kubernetes | |
| Main job | Packs and runs your app in containers | Runs and looks after many containers on many servers |
| Typical size | One server or a laptop | A cluster (a group of servers) |
| Self-healing and auto-scaling across servers | Not its main job | Built in |
| Skill needed to run | Basic | Specialist |
| Extra platform fee on big clouds | No | Often a cluster fee |
What is Docker?
Docker is "an open platform for developing, shipping, and running applications", in the words of its own documentation. It packs your app and everything it needs into an image (the recipe), then runs it as a container (the running copy). The container behaves the same on the developer's laptop and on your live server.
Docker Engine, the part that runs containers on servers, is open source under the Apache License 2.0. Docker Desktop, the laptop app, is free for businesses with fewer than 250 employees and under US$10 million in yearly revenue. Larger companies need a paid Docker plan for it.
What is Kubernetes?
Kubernetes is an open source system that runs containers across a group of servers and keeps them healthy. Its official docs call it "a portable, extensible, open source platform for managing containerized workloads and services". Google made the project open source in 2014.
What Kubernetes does for you
The Kubernetes docs list the jobs it takes over. In plain words:
Notice what is missing. The docs also say Kubernetes "does not deploy source code and does not build your application". You still need a way to build and release your software.
Is Kubernetes replacing Docker?
No. Kubernetes stopped using Docker Engine directly in version 1.24, released in May 2022, but images built with Docker still run on Kubernetes. The Kubernetes team wrote that "Docker images will continue to work on your cluster with all runtimes".
What changed was an internal link called dockershim, which Kubernetes removed. Kubernetes now uses container runtimes such as containerd and CRI-O. Its setup docs still list Docker Engine among the runtimes they cover.
For you as an owner, nothing changes: your developer can keep building with Docker.
Kubernetes vs Docker Compose: which one fits a business app?
For most business apps on one server, Docker Compose is the simpler fit. Docker describes Compose as "a tool for defining and running multi-container applications", for example your app and its database started together. Kubernetes makes sense when one server is no longer enough, or when the app must keep running even if a server fails.
Signs you may need Kubernetes
- Your app runs on several servers, and someone has to restart failed parts by hand.
- Your traffic jumps sharply at certain times, such as a sale or a results day, and the app slows down.
- Your software is split into many separate services, each released on its own.
- You have, or will hire, people who know how to run Kubernetes.
If none of these is true, a single server with Docker, or a managed service that runs containers for you, is usually enough. Google Cloud Run is one such service. Google's docs say "you don't have to create a cluster or manage infrastructure to be productive with Cloud Run".
What we have seen in our own projects
The Beyond Horizon has delivered 40+ projects.
Two of them use Google Cloud Run. One is the NFC music platform for Warm White Entertainment. The other is the order and production software we built for Prodeazy, which runs on Google Cloud Run and Vercel.
We pick hosting to suit the size of the job, and we explain the reason in plain words before you sign.
If you are planning business software and want the hosting chosen around your real traffic, you can read about The Beyond Horizon's custom software development for Indian businesses.
What does Kubernetes cost?
Kubernetes itself is free, but running it on a big cloud usually adds a cluster fee plus the cost of the servers. As of October 2026, Google Kubernetes Engine charges US$0.10 per cluster per hour, and Amazon EKS also charges US$0.10 per cluster per hour under standard support. The servers that run your app are billed separately.
| Cost item | Google Kubernetes Engine (GKE) | Amazon EKS |
| Cluster fee | US$0.10 per cluster per hour | US$0.10 per cluster per hour (standard support) |
| Free allowance | US$74.40 monthly credit per billing account, about one zonal or Autopilot cluster | Not listed |
| Older Kubernetes versions | Not covered in this guide | US$0.60 per cluster per hour in extended support |
| Servers that run your app | Billed separately | Billed separately |
The hidden cost: people
A tip most first-time buyers miss: on Amazon EKS, a cluster on an older Kubernetes version moves to extended support at six times the hourly fee. Someone must keep the cluster updated, and that is skilled work you pay for every month. Ask who will do it before you agree.
One firm rule: get the monthly cloud estimate and the name of the cluster's maintainer in writing. If no one can give you both, the setup is not ready for your business.
Questions to ask before you approve Kubernetes
- Which specific problem does Kubernetes solve for my app today, not in three years?
- Could a managed container service, such as Google Cloud Run, do the same job without a cluster?
- What is the expected monthly bill for the cluster fee and the servers together?
- Who will update the cluster to newer Kubernetes versions, and how often?
- Will the cloud account and the setup files be registered in my company's name?
Good developers welcome these questions. If the answers are vague, ask for them again in writing before you sign.
A closing note
The Kubernetes vs Docker question usually has a simple answer for a business owner. Start with Docker on a single server or a managed container service. Move to Kubernetes only when a real problem, like failed servers or heavy traffic, makes it worth the cost.
If a developer has proposed Kubernetes and you want a plain second opinion on whether you need it, call or WhatsApp The Beyond Horizon on +91 75973 92744.