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Inkli Engine · For direct mail teams

Direct mail houses, agencies, and print shops —
this is the engine underneath.

Real handwritten letters, rendered at production scale. Plugged into your existing fulfilment stack via REST API and webhooks. Output delivered straight to your SFTP or S3 as PDF/X-4 with your ICC profiles embedded — the print-house-ready format your Xerox iGen actually wants.

Priced in pence per page — wholesale rates for platform partners. You quote your customer at your own retail rate and keep the margin. White-labelled, always.

Talk to salesSee the API

Where Inkli sits

Step 1

Your side

Your CRM, campaign tool, or ops workflow — however you already assemble a mail-out. Trigger via REST or upload a CSV.

Step 2

Inkli Engine

Renders each letter with real pen physics + your chosen ink + your layout template. Fires proof-then-approve or straight to full render.

Step 3

Your fulfilment

Output arrives PDF/X-4 with your ICC profile at your SFTP or S3 — straight into the print floor's hot folder. No portal detour.

What you get

Everything a production mail workflow actually needs — not just a nice-looking preview.

Render engine

  • Over 50 handwriting styles — each with real pen physics
  • Per-character variation, ink pooling, pressure & bleed
  • Configurable defect physics (tremor, drift, spacing)
  • Dynamic layout templates with named zones + custom stationery

Print output

  • PDF/X-4 with embedded ICC profile
  • Standard profiles (FOGRA51, GRACoL, SWOP) + custom .icc upload
  • Bleed marks, trim boxes, per-campaign colour override
  • Delivery targets — output pushes to your SFTP or S3

Integrations

  • Public REST API with pk_live_ / pk_test_ keys
  • HMAC-signed webhooks (campaign.completed, .failed, proof.ready)
  • Idempotency-Key on writes — safe to retry
  • Immutable completed campaigns — audit-safe artifacts

Operations

  • Unmetered 3-recipient proofs — approve to fire the billed run
  • One-live-run-per-user guard with wedge escape
  • Per-partner retention windows with tombstone billing
  • Sub-clients with per-client usage rollups + metering

Who it's for

Built for the teams that actually ship direct mail.

Direct mail houses

Rendering across multiple clients from one account. Sub-clients get their own usage rollup + delivery target. Proofing is built in.

Creative agencies

Offer handwritten campaigns as a service without building the pipeline. White-label — the output is your PDF on your storage; Inkli branding never appears on the artwork.

Print shops

Add handwriting-as-a-service to your catalogue. PDF/X-4 with your ICC lands in a hot folder. No new floor equipment.

Wholesale rates. Retail margin yours.

You quote your customer.
We power the render.

Platform pricing is per page in pence — not a subscription tier. Mail houses, agencies, and print shops resell handwritten campaigns at their own retail rate; the margin between wholesale and retail sits with you.

White-labelled end-to-end. Your brand on the invoice; your delivery target on the output; your customer never sees Inkli. The rendering engine is ours — the customer relationship is entirely yours.

Get wholesale pricing

You pay

Inkli — per page wholesale

From 10p per letter — tailored quote based on your volume and format.

Your margin

Your customer pays you

Your retail rate

Whatever your service is worth to the buyer — pence, pounds, whatever your positioning supports.

Ready to plug it in?

Tell us your volume, your stack, and how urgent it is. We'll come back within a working day with a technical walkthrough and pricing.

Talk to salesSee the API →