A managed service for storing and managing application settings, feature flags, and configuration values separately from your code. Like a central control panel for all your app's settings — you can change behaviors without redeploying your application.
An e-commerce team uses AWS AppConfig to gradually roll out a new checkout flow to 10% of users, then 50%, then 100% — all without deploying new code. If conversion rates drop, they instantly toggle back to the old flow from the configuration dashboard.
All provide centralized configuration management outside of application code. AWS AppConfig (part of AWS Systems Manager) emphasizes safe deployments of configuration changes with validators, monitors, and rollout strategies. Azure App Configuration focuses on key-value configuration with tight Azure SDK integration and feature flags. GCP has no direct 1:1 “App Configuration” service; Firebase Remote Config is commonly used for runtime parameter/feature flag control (especially mobile/web), while Google Cloud Secret Manager is for secrets (not general app config). OCI does not have a direct equivalent branded as an app configuration service; teams often implement this pattern using OCI Object Storage/Functions/OKE plus a configuration library, or use third-party feature flag/config platforms.