AirBrake - Airbrake is the leading exception reporting service, currently providing error tracking.

PDFCrowd - Pdfcrowd is a Web/HTML to PDF online service. Convert HTML to PDF online in the browser or in your PHP, Python, Ruby, .NET, Java apps via the REST API.

Sentry.io - From error tracking to performance monitoring, developers can see what actually matters, solve quicker, and learn continuously about their applications - from the frontend to the backend.

DocRaptor - As the only API powered by the Prince HTML-to-PDF engine, DocRaptor provides the best support for complex PDFs with powerful support for headers, page breaks, page numbers, flexbox, watermarks, accessible PDFs, and much more

Instabug - The top apps in the world rely on Instabug for beta testing, user engagement and crash reporting.

PDFShift - Convert any HTML documents to high-fidelity PDF using a single POST request