EZStock VS DynamicDocumentAPI

EZStock's answer

I don't have consent to name customers publicly, but EZStock is in production use by Shopify stores managing several thousand SKUs and variants.

DynamicDocumentAPI's answer:

Dynamic Document API is a young product. Our users are mostly developers and small SaaS teams, and we don't name customers without their permission.

EZStock's answer

EZStock is built as a direct replacement for Shopify's Stocky, which is being discontinued. It ships a built-in importer that reads Stocky's own supplier and purchase-order exports, so you migrate in minutes instead of rebuilding by hand. Beyond that, it does the three things most inventory apps make you choose between: demand forecasting with days-of-stock-left, full purchase orders you can email to suppliers, and barcode stocktakes from a phone, all in one app at a small-business price.

DynamicDocumentAPI's answer:

It covers the whole path from data to finished document in one API: you design a template in a visual or HTML editor (or send raw HTML, CSS or Markdown), send JSON, and get a PDF or image back. The same service also creates e-invoices (XRechnung, EN 16931, Factur-X / ZUGFeRD) that are validated against the official rules before they are returned, and can embed them in the PDF. Rendering is deterministic: the same template and data always give the same document, laid out by a headless browser, with no AI model generating content. Everything runs in the EU (Germany). It also ships an MCP server, so AI agents like Claude and ChatGPT can render documents directly.

EZStock's answer

I build Shopify apps as a solo developer. EZStock started when Shopify announced Stocky was going away and merchants had no clear replacement that did forecasting, purchase orders, and stocktakes together without jumping to enterprise pricing. I built the Stocky importer first so people could actually move over, then grew it from there based on what real merchants asked for. One paying merchant with several thousand variants shaped a lot of the roadmap.

DynamicDocumentAPI's answer:

Almost every product eventually needs to produce documents, and most teams end up building their own rendering stack: a headless browser, fonts, page breaks, storage and retries. It works until an invoice splits a table row or a certificate shows the wrong date, and then it becomes a support ticket. We built Dynamic Document API to be that layer for them: templates, rendering and delivery as one service, hosted in Europe, treating pagination, fonts and formatting as engineering problems rather than edge cases. When e-invoicing became mandatory for B2B in Germany, we added validated XRechnung and ZUGFeRD output, and with AI agents producing more paperwork, an MCP server followed.

EZStock's answer

Most Shopify inventory apps are either enterprise-priced or only do one piece of the job. EZStock covers forecasting, purchase orders, supplier management, and barcode counts together, starts free, and imports directly from Stocky so switching is painless. It syncs to Shopify as the single source of truth, so receiving a purchase order updates your live inventory automatically. If you want the Stocky workflow without the enterprise bill, that is the fit.

DynamicDocumentAPI's answer:

Most document APIs do one thing: convert HTML to PDF, or fill templates. Dynamic Document API does both, adds image templates, PDF merging and validated e-invoices, and offers them through a REST API, SDKs for Node and Python, Zapier, Make, n8n and an MCP server for AI agents. Data is processed and stored in the EU only, files come back as signed links that expire, and storing nothing at all is a supported option. Pricing is predictable: one published credit table, the same core features on every paid plan and a spend cap you control. We also publish a render-time benchmark with its method and raw data, so you can check our speed instead of trusting a claim. The free plan includes 50 renders a month without a credit card.

EZStock's answer

Small and mid-size Shopify merchants who have outgrown Shopify's built-in inventory tracking, especially stores coming off Stocky. Typically stores with real SKU counts and suppliers to reorder from, where stockouts and manual purchase orders have started costing time. Not enterprise warehouses, and not brand-new stores with a handful of products.

DynamicDocumentAPI's answer:

Developers and product teams whose software has to send documents: invoices after a payment, certificates after a course, reports, labels and statements. Typical users are SaaS companies, marketplaces, e-commerce and learning platforms. A second group are businesses in Germany and the EU that need compliant e-invoices (XRechnung, ZUGFeRD) for the German B2B e-invoicing mandate and public-sector buyers. No-code builders use it through Zapier, Make and n8n, and teams building AI agents use the MCP server.

EZStock's answer

Remix, Node.js, PostgreSQL with Prisma, and Shopify's App framework, including Theme App Extensions and Shopify Functions. Hosted on Railway. The app uses Shopify's Admin GraphQL API as the source of truth for inventory.

DynamicDocumentAPI's answer:

Rendering runs in Rust workers that drive headless Chromium over the DevTools protocol, with MiniJinja for templates. The API and control plane are built with Django and Django REST Framework, with Celery, PostgreSQL, Valkey and NATS JetStream for queues and events, and S3-compatible object storage for files. PDF/A output is checked with veraPDF and e-invoices with the official KoSIT validator. The dashboard and website are built with Next.js. Everything runs on Kubernetes in data centres in Germany.