What are feature flags in a SaaS application?

Feature flags, also known as feature toggles or switches, are a powerful tool that allows software teams to control the release of new features in a SaaS application. They give you the power to turn features on or off, roll them out to a select group of users, or even test multiple versions of a feature simultaneously. In this blog post, we'll explore the ins and outs of feature flags and how they can help you create better, more reliable software.

What are Feature Flags?

At their core, feature flags are a simple concept: They're a way to control the visibility and functionality of a feature within a SaaS application. By using feature flags, developers can enable or disable certain features for specific users, user groups, or even entire environments (e.g., development, staging, or production).

Feature flags are typically implemented as conditional statements in the code that check whether a feature should be enabled or disabled. When a feature is "flagged" it can be turned on or off without requiring any changes to the code or redeployment of the application.

Why Use Feature Flags?

There are several benefits to using feature flags in your SaaS application:

  1. Controlled Rollouts: Feature flags give you the ability to roll out new features gradually, so you can test them with a small group of users before making them available to everyone. This can help you identify and fix any issues before they impact your entire user base.
  2. A/B Testing: With feature flags, you can easily test multiple variations of a feature to see which one performs best. This can help you make data-driven decisions about which version of a feature to roll out to all users.
  3. Easy Rollbacks: If a new feature causes issues or isn't well-received by users, feature flags make it easy to roll back the change without having to redeploy your application.
  4. Separation of Deployment and Release: Feature flags allow you to deploy new features without making them immediately available to users. This means you can deploy code more frequently and with less risk, as you can control when a feature is actually released to users.

How to Implement Feature Flags

There are several ways to implement feature flags in your SaaS application, but the most common approach is to use a configuration file or a feature flag management system.

  1. Configuration File: You can store feature flag settings in a configuration file that is read by your application at runtime. This file can be updated to enable or disable features without requiring a code change or redeployment. However, this approach can become unwieldy as the number of feature flags grows.
  2. Feature Flag Management System: A more scalable and flexible option is to use a feature flag management system, which provides a centralized dashboard for managing feature flags across your entire application. These systems often include advanced features like user targeting, A/B testing, and analytics. Some popular feature flag management systems include LaunchDarkly, Split, and Rollout.


Feature flags are a powerful tool that can help you build better, more reliable SaaS applications. By giving you the ability to control the release of new features, feature flags enable you to test and iterate on your software more quickly and with less risk. Whether you're a small startup or a large enterprise, feature flags can help you deliver a better user experience and stay ahead of the competition. EnaLog is an event tracking and analytics platform which will support feature flags in the near future, you can register for a free account here