Aviationstack ◆
Aviationstack is a scalable REST API for real-time flight tracking, historical flight data, airport info, and global aviation data.

Firebase (Developer Tools): Firebase is Google's platform to build, run, and scale mobile and web apps with AI features and managed backend services. Pricing: from Free (Spark) or pay-as-you-go (Blaze) with $300 credit. (data verified July 2026)
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Firebase is a comprehensive app development platform by Google that provides backend services, SDKs, and AI tools to help developers build, run, and scale mobile and web applications faster. It solves the problem of managing infrastructure, authentication, databases, storage, and analytics from scratch, letting teams focus on app logic and user experience.
Firebase is ideal for mobile and web developers, indie makers, startups, and enterprise teams who need a reliable, scalable backend without server management. It suits both beginners prototyping ideas and large apps like Duolingo, Venmo, and NPR. It is not for projects requiring on-premise deployment or full control over database engines.
Common use cases include real-time chat apps (using Cloud Firestore), user authentication with email or social logins, sending push notifications via Cloud Messaging, hosting static sites with free SSL, tracking crashes with Crashlytics, and A/B testing features to improve engagement. Developers also use Firebase Extensions to integrate Stripe payments or search with Algolia in minutes.
Firebase offers a no-cost Spark plan with generous usage limits and no payment method required. For higher limits and access to all services, the Blaze plan uses pay-as-you-go pricing and includes $300 in free credit for eligible new accounts. Costs scale with usage (e.g., Cloud Firestore, Cloud Functions, hosting bandwidth). Use the Google Cloud calculator to estimate project costs.
Editorial score from our review methodology — not user ratings.
Firebase pricing: Free (Spark) or pay-as-you-go (Blaze) with $300 credit. Billing model: Free.
Free for life with generous usage limits: 50K MAUs for Authentication, 1 GiB Cloud Firestore storage, 10 GB/month network egress, 20K document writes/day, 2M Cloud Function invocations/month. No payment method required.
All Spark features plus higher quotas and access to all services. Pricing is usage-based (e.g., $0.20/GiB for outgoing bandwidth after 10 GiB, $0.10/GB for Cloud Firestore storage after 1 GiB). Eligible new accounts receive $300 in free credit. Includes all no-cost Spark usage.
Note: Specific service pricing (e.g., Cloud Run, Artifact Registry) follows Google Cloud standard rates. Use the Google Cloud Pricing Calculator to estimate costs for your app.
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