Milled vs MailCharts vs Inboox: Which Ecommerce Email Archive Is Right for You? (2026)

If you research competitor emails for an ecommerce brand, three tools come up: Milled, MailCharts, and Inboox. (Disclosure: I co-founded Inboox — facts below are checkable.) Here's the honest head-to-head.

Milled is a search engine for marketing emails. Scale (live homepage counter): 50.2M+ emails from 102,000+ brands, ~20,000 added daily, archive back to 2012. Free Basic plan (6 months of data); Pro/Team unlock the full archive, advanced search, and keyword alerts. Use it for: instant "what did Brand X send for Black Friday" lookups, subject-line digging, holiday research. Limits: no curation, no analysis, no journey context — it's everything, raw.

MailCharts is competitive intelligence. ~2,500 curated ecommerce brands across 80+ industry groups, historical data since 2013, journey maps, cadence benchmarks, SMS examples. Use it for: agency client decks, lifecycle audits, benchmark reports. Limits: smaller brand set, and access is enterprise/sales-led (now part of the Litmus ecosystem) — not a casual tool.

Inboox is an AI-driven swipe file. 1.5M+ emails from 10,000+ Shopify brands, each with an AI breakdown (why the subject line works, offer structure, journey stage), searchable by flow type, audience, and tone. Free trial, $10/mo. Use it for: learning WHY emails work and finding proven examples for the exact flow you're building. Limits: ecommerce-only; smaller raw archive than Milled.

Decision guide:

• Need raw volume and speed → Milled

• Need client-facing journey intelligence → MailCharts

• Need analyzed, stealable examples for your own flows → Inboox

• Honest power stack: Inboox + Milled ($10/mo + free) covers 90% of ecommerce email research.