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

Switchboard Audio SDK (Developer Tools): Switchboard Audio SDK: deploy real-time audio features across any device with a free tier starting at US$0. Pricing: from from US$0 (free tier). (data verified July 2026)
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Switchboard Audio SDK is a cross-platform development toolkit built on a C++ core with high-level bindings, enabling software developers to design, prototype, and deploy real-time audio features and applications across mobile, web, desktop, and physical devices. It solves the complexity of building and scaling audio engines from scratch by providing a production-ready SDK with open-source example apps that can be remixed for voice, AI, and interactive use cases.
The SDK is primarily for software developers building real-time audio into their apps or devices. The companion Switchboard Editor (no-code) supports product managers, innovation leaders, and hobbyists for rapid prototyping and experimentation. It is NOT for non-technical end-users seeking a finished audio app—it is a developer tool for building custom audio experiences.
Common applications include voice-enabled mobile apps, AI-powered audio features, real-time communication tools, interactive gaming audio, and prototyping new audio products using the drag-and-drop Editor. Teams in R&D can bring their own algorithms to the SDK and test them with the Editor before deployment.
Editorial score from our review methodology — not user ratings.
Switchboard Audio SDK pricing: from US$0 (free tier). Billing model: Freemium.
US$0 — Up to 10K MAUs, self-reported, documentation-only support, free nodes only, attribution required in some cases. No credit card needed.
US$100/mo per 10K MAUs (equivalent to $0.01/MAU/mo). Includes email support (best-effort), paid nodes available, no attribution required. Sold in 10K MAU increments.
Contact sales for flexible pricing models (per device, perpetual license, per minute, revenue share, etc.), custom support, and enterprise-scale deployments. Hourly support base fee of $150/hr; discounts available for monthly packages.
Switchboard SDK is free to start (no credit card). Editor is currently in limited preview.
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