Should you build or buy Document Generation?
Document generation software merges structured data from a CRM, ERP or form into a rendered output document, such as a contract, invoice, statement or shipping label, at scale. Operations, sales and IT teams across nearly every industry use it as the underlying merge-and-render engine other systems, like a CRM's quoting flow, call into.
Copy reviewed 2026-10-04 · Research revision 2026-09-25
Sources: codepasta.com; docmosis.com; docmosis.com; docs.paperless-ngx.com
Do we still need Conga, Docmosis or Templafy to generate documents? Not for the rendering core. Be careful before paying for the whole platform: named teams run docxtemplater, Carbone, Gotenberg, LibreOffice headless and Puppeteer in production, and the work is generic, so the vendor's remaining value is Salesforce integration, template authoring for business users and brand governance. Keep paying only for those pieces if you use them; the engine itself is a solved problem.
Build it, buy it, or bridge?
When building makes sense
The rendering core is ordinary engineering now, and named teams run it at real volume. Carriyo generates about 10,000 shipping labels and other PDFs a day with Puppeteer on AWS Lambda, at a 365 ms p95. docxtemplater, Carbone, Gotenberg and Puppeteer are mature open-source projects in production use for merging structured data into rendered documents, and the open-source document manager Paperless-ngx documents how to connect a Gotenberg server. Build when your output set is narrow, engineering owns the templates, and you don't need Salesforce-native triggers or business-user template editing. Watch the counter-cases, though. Finzsoft replaced its homegrown Word mail-merge system with Docmosis Cloud because its clients needed easier template management and its large statement runs needed to be faster.
When buying makes sense
Do you still need Conga, Docmosis or Templafy to generate documents? Not for the rendering core, since open-source engines like docxtemplater, Carbone, Gotenberg and Puppeteer run in production at real volume, and the work carries no competitive edge either way. What remains worth paying for is Salesforce-native generation through Conga or Formstack, business-editable Office templates through Fluent by Apryse (formerly Windward) for analysts who are not engineers, and brand governance through Templafy for a large distributed workforce. Docmosis cloud starts at $49 a month, which is cheap enough that switching costs of a build rarely pay off on license alone. Keep paying only for the pieces you actually use: Salesforce depth, template authoring for business users, or governance across many templates and teams. The engine itself is a solved problem either way.
The desk read
Build-versus-buy analysis for Document Generation is being written. In the meantime, the framework that drives every B4 call is on the B4 Index page.
Frequently asked
Is it realistic to replace Conga or Formstack with an open-source engine?
For the rendering core, yes; docxtemplater, Carbone, Gotenberg and Puppeteer are all mature, actively maintained open-source projects that run in production. Conga's remaining value is Salesforce-native triggers and packaging, not the rendering itself.
Why do some companies move away from their own document engines?
The common pattern: a homegrown engine works until template maintenance or batch volume outgrows it. Finzsoft moved from its homegrown system to Docmosis Cloud to make template management easier for clients and to speed up large statement runs. A 33-page statement took 4.17 seconds on Docmosis against 99.6 seconds on the old system.
Are LLM-generated documents replacing template-based rendering yet?
Not for binding documents. LLM output shows up in production as drafting that people review, and deterministic templates still handle contracts, invoices and other documents that carry legal or financial weight.
What should we actually be paying a document-generation vendor for?
Salesforce-native packaging if you run quotes or contracts through Salesforce, business-editable Office templates if non-technical staff author documents, or brand governance across many templates and a large workforce. If none of those apply, the rendering engine alone is not worth a subscription.