Customei is a print-on-demand studio for Shopify merchants who do more than tees. A PixiJS canvas editor, ten live-conditional field types, and five specialty generators — star maps, string art, crosswords, interactive maps, and an AI that drafts the whole product.
3,200+ merchants on Shopify already made the switch.
Layers
Shirt color
Size
Your name
Shipping personalized goods with Customei in 42 countries
§ 01 — The studio
Customei is built on six years of print-on-demand experience. Every tool is here because it fixed a real merchant's real problem — not because it looked good in a pitch deck.
A design studio that feels native, not embedded. Layer text, shapes, photos, and custom geometry — with a history engine that never misses and a warp-mesh that wraps your artwork onto real mug, tee, and hoodie mockups.
Text, select, swatch, color, date, range, checkbox, upload, map, star map. Show this if they pick that — pure data, no scripts.
Colors, fonts, images, categories, trash, restore. Your whole palette, one search away — in every template, every swatch, every editor.
Abandonment insights, top-winning options, product health, completion rates. Know which swatch is costing you money — and fix it.
Drop one theme block. Cart Transform on Shopify Plus, fee variants everywhere else — the switchover is automatic.
Templates publish to Cloudflare R2 with hash-addressed paths. A million preview loads, zero origin cost — plus 300dpi print-ready exports.
§ 02 — Niche generators
Every other personalization app gives you “add text to a tee”. Customei ships with five dedicated generators for the POD categories that actually make money.
Tell Customei what you want to sell. In one pass, it drafts the option set, the design template, the Shopify product listing, and a marketing plan — editable before anything touches your store.
Your sky, your date, your place.
Render the exact night sky for any date and latitude/longitude. Powered by d3-celestial. Merchants sell these as anniversary, wedding, and birth-night prints.
Threads from your photos.
Upload a face, a pet, a logo — our algorithm resolves it into thread paths on a circular board, rendered live with progressive zoom, pan, and mobile-aware batching.
Anniversary words. Baby names. Proposals.
A Lambda-hosted smart-placement algorithm renders crossword puzzles at 3000×3000 with four theme presets and four grid styles. Upload a word list — print-ready in 250ms.
Where you met. Where you live.
Mapbox Static Images proxied through our app — pick a style, lat/long, zoom, bearing, pitch, and marker. Runs identically in the admin preview and on the storefront.
§ 03 — How it works
From install to live storefront, most merchants are taking personalized orders in under twelve minutes. We've timed it.
Click Install on the Shopify App Store. Customei scaffolds your shop automatically.
Open the canvas editor. Drag, type, swatch, warp, curve — save when it feels right.
One button. Templates are hashed, uploaded to CDN, and wired into your theme.
Customers personalize live on the storefront and check out — in any currency.
§ 04 — Merchants
"We tried six personalization apps in 2024. Customei is the only one that did not crumble on mobile Safari. The rest is a bonus."
"Our conversion rate on custom orders went up 38% in the first month. Our fulfilment team stopped emailing us about broken artboards."
"The fact that I can edit a template at 11pm and see it live by 11:01 is unreasonable. I keep testing it to see if something breaks."
"Customei's Lambda print pipeline is the first tool where 'print ready' actually means print ready. Our fulfiller finally trusts us."
§ 05 — Questions
Something we missed? Ping hello@customei.app and a real human will write you back within the hour.
§ Final word
Install Customei in one click. 14-day free trial on every plan. No card. No commitment. No forgotten craft.