RallyUp might be a bit more popular than PDFCrowd. We know about 1 link to it since March 2021 and only 1 link to PDFCrowd. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
To follow on with this, I've used https://pdfcrowd.com/ too. Source: about 3 years ago
We've used RallyUp in the past, but that was a few years ago so I don't know if anything's changed. They have a great team for vetting and working with charities and campaign organizers. I'd recommend starting there. Source: over 2 years ago
pdflayer - Free, powerful HTML to PDF API supporting both URL and raw HTML conversion. Unlimited document size, lightning-fast and compatible PHP, Python, Ruby, etc.
Give Lively - Give Lively is an online technology platform for the advancement of nonprofit fundraising.
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
donate.ly - The Simplest Way to Fundraise.
PDFShift - Convert any HTML documents to high-fidelity PDF using a single POST request
Salsa - Anonymous messages in your workplace