Future-Proof Your App: Scalability Considerations for Long-Term Success

Whether you plan to launch a new app or envision exponential growth in your existing app, you must know ‘scaling apps’!

Imagine your product becoming the next big thing, like Candy Crush Saga, Pokemon Go, Instagram, or Snapchat, with millions of downloads every minute.

How smoothly will your app handle this increased load? Will it be a seamless journey like Netflix’s, or are you up for a frustrating user journey with poor performance or app unreliability?

Scalability is the key to sustainable business growth. It's not merely a topic for future deliberations when success knocks—it's the bedrock that determines your application's destiny.

Candy Crush Saga experienced a 12-fold increase in revenue in just a year. But what’s more impressive is that they accommodated this growth with only a six-fold cost increase, sketching a nearly 70-fold increase in operating income.

This is the power scalability holds!

This blog covers everything from the minute details of scaling apps to challenges you can anticipate while scaling your app.

What Is Application Scalability?

Scalability is the flexibility of an application.
It is essential to adapt to varying demand levels. Your application must deliver top-class performance consistently regardless of the number of users without compromising speed, functionality, or reliability.

Scaling apps can be of two types – horizontal scalability and vertical scalability.

Vertical Scaling vs Horizontal Scaling

Horizontal Scalability: Adding new resources to your system.
Vertical Scalability: Upgrading your existing resources with more power.

Tech giants like Google, Facebook, Amazon, and Zoom employ horizontal scaling. While horizontal scaling is expensive, complex, and requires maintenance, it ensures less downtime and better flexibility. ERP software like SAP ERP or Microsoft Dynamics can benefit from vertical scaling.

Scalability Metrics
Scalability metrics are performance metrics used to measure your application's scalability. Standard metrics include response time, throughput, resource utilization, and error rate.
Let us discuss these metrics in brief:

• Response Time: The amount of time your app takes to handle a request and respond.
• Throughput: The rate at which your app can process requests.
• Resource Utilization: Utilization of resources like CPU, memory, and network.
• App Availability: Percentage of time when your application is operational and accessible.
• Scalability Index: The ratio of change in performance to the change in load.

Why Does Scalability Matter?

If you want millions of happy users, scaling the app is your key!
Unfortunately, several businesses were blindsided by last-minute scalability issues.
Pokémon GO experienced the heat of poor scalability when it became an overnight sensation. The game's servers could not handle overload, which led to frequent crashes and downtime. Similarly, Twitter crashed when millions of users started conversing on the app!

Thankfully, some apps wrote their success stories on scalability.

The best example of a scalable app is Zoom. Zoom's user base skyrocketed from 10 million to 200 million during the lockdown. Offices were migrating to virtual meeting rooms, and Zoom seamlessly facilitated this with disruption-free services.
Zoom’s ability to scale quickly took it from $623 million to $4.10 billion in just two years.

Here are three reasons why scalability matters for your app:

1. Meeting User Demand
Scalability enables you to build and integrate new and exciting features into your app. It makes your app react quickly, adapt to changing user requirements, and attract more users without compromising performance. Check out Netflix. The application easily accommodates its growing user base, releases new features frequently, and delivers a flawless user experience.

2. Cost Efficiency
Scalability means accommodating growth without increasing your infrastructural resources. Auto-scaling empowers applications to scale up when the load increases and resources can be scaled back down once the traffic subsides without a substantial change in cost. The Black Friday Rush is an excellent example of how autoscaling helps e-commerce sites.

3. Competitive Advantage
Scalable apps enable organizations of all sizes to quickly adapt to changing market dynamics. Whether you're a start-up or a legacy enterprise, scalability allows you to meet evolving customer needs, thereby gaining customer loyalty and trust.
Now that you know why scaling apps is so important, let’s understand how to build scalable apps.

How Do You Build Scalable Applications?

Any application, no matter how big or small, must be designed and developed with scalability in mind.
Here are 8 tips for building scalable applications:

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