XpressDox
docassemble
Woodpecker
TheFormTool
Knackly
HotDocs
Oracle Documaker
document assembly, automation and management

DocRaptor
MailMergic
PDF Generator API
Doczilla
wkhtmltopdf
DocuSign
HTML PDF API
PDF filling API that makes it easy to fill out PDF forms and convert HTML to PDFs

Which is more popular?
Based on our record, DocSpring seems to be more popular. It has been mentioned 5 times since March 2021.
Website, pricing, platforms and company facts side by side.
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P
Pathagoras
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|---|---|---|
| Website | pathagoras.com | docspring.com |
| Pricing | ||
| Company | — | Startup from the United States · 1 - 9 employees · 2017 |
| Listed in |
In their own words, as submitted to SaaSHub.

No description of Pathagoras yet.
We provide a PDF filling and generation API: Upload your PDF to our visual template editor to set up form fields and data types Post JSON to fill out existing PDF forms with data Generate editable PDF forms, or overlay static data on top of fields Create HTML/CSS templates with Liquid fields,...
What each product offers, as listed by its team.

Possible disadvantages
How often each product is chosen within a category, 0–100% relative to the other.

As answered by people managing Pathagoras and DocSpring.
DocSpring's answer:
Ruby on Rails, React, AWS
DocSpring's answer:
DocSpring is built specifically for developers who need reliable, secure PDF generation in production. We combine PDF form filling and HTML-to-PDF in a single API, with a visual template editor, typed fields, and validation to catch issues early. Our product has a lot of power features and is built to handle very advanced forms. Our infrastructure is SOC 2 Type II compliant, battle-tested, privacy focused, and optimized for high-volume workloads, so you can ship PDF features quickly and then stop thinking about them.
DocSpring's answer:
DocSpring is designed for teams who need a powerful tool with all the features you need for complex forms and business logic. DocSpring supports structured JSON, typed fields, and array iterations, and many other advanced features, so your templates stay aligned with your real data model. You get powerful validation, a visual editor, strong observability, and an API that fits into modern engineering workflows, so you spend less time fighting PDFs and more time shipping product.
DocSpring's answer:
DocSpring is built for engineering and product teams who manage complex documents in production: things like financial applications, insurance forms, healthcare and legal documents, HR and payroll workflows, and government-style forms.
DocSpring's answer:
I used to work at a payroll company (Gusto). We had built a similar in-house tool for filling out tax forms. I then built the first version of DocSpring (formerly named FormAPI) while I was living in Thailand. I built it to automate the filling out of visa application and visa extension forms, but realized that it could also be used for tax forms, real estate contracts, and any other kind of fillable PDF form.
DocSpring's answer:
Share your experience with using Pathagoras and DocSpring. For example, how are they different and which one is better?
Recommendations tracked on public social media and blogs since March 2021.

Tracking Pathagoras since Mar 2021.
I'm still working on DocSpring [1], originally launched on Hacker News in October 2017 under the name "FormAPI." It's a PDF generation API with a template editor UI for setting up fields on PDF forms. It makes it easy to turn complex tax... - Source: Hacker News / over 1 year ago
For programmatic filling of PDFs, have a look at DocSpring: https://docspring.com. - Source: Hacker News / over 2 years ago
Great post. I've spend a lot of time reading through the PDF specification over the last ~5 years while building DocSpring [1], and I still feel like I've barely scratched the surface. Qpdf is a great tool. One of my other favorites is... - Source: Hacker News / about 3 years ago
When comparing Pathagoras and DocSpring, you can also consider the following products.

XpressDox Desktop for Microsoft® Office Word is an affordable document assembly system.
Compare XpressDox to Pathagoras or DocSpring:

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
Compare DocRaptor to Pathagoras or DocSpring:

docassemble is a free, open-source expert system for guided interviews and document assembly.
Compare docassemble to Pathagoras or DocSpring:

Effortless Mail Merge for PDFs — Generate, personalize, and send documents in minutes, not hours.
Compare MailMergic to Pathagoras or DocSpring:

Legal document automation for solo & small firms. Simple to use, works in Word, connects to everything.
Compare Woodpecker to Pathagoras or DocSpring:

PDF generation API that turns your JSON data into documents from templates built with AI or a drag-and-drop editor, which your users can edit inside your app through a white-label embedded editor.
Compare PDF Generator API to Pathagoras or DocSpring: