Find the rightpost code toolfor the job.
From foreign addresses and labels to batch checks, see how PostcodeDog differs from the tools you already know.
PostcodeDogPostcodeDog vs the tools you know
Each page focuses on the workflow, not a feature checklist.
Youbianku
Compare PostcodeDog and Youbianku for lookup cost, audience, input, batch and developer access.
USPS ZIP Code Lookup
Compare PostcodeDog and USPS ZIP Code Lookup for coverage, input, formats, batch and developer access.
Postcodes.io
Compare PostcodeDog and Postcodes.io for coverage, interface, input, batch and languages.
Zippopotam.us
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GeoNames
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Melissa Lookups
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Royal Mail Postcode Finder
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Japan Post Postal Code Search
Compare PostcodeDog and Japan Post Postal Code Search for coverage, input, formats, languages and batch and agents.
ZIP-Codes.com
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IP138 邮编查询
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Zipcodebase
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GeoPostcodes
Compare PostcodeDog and GeoPostcodes for form, access, input, batch and AI agents.
Smarty
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Google Maps
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ChatGPT
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Claude
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One lookup box for the messy, multi-country part of the job.
Most post code tools are built around one country or one data product. PostcodeDog is built around the address in front of you.
Any format in one box
Paste a full address, a city or a code. Country and format are detected, so nobody has to remember whether Japan uses seven digits or the UK uses letters.
82 countries in one workflow
The same lookup handles US ZIP, UK outcode, German PLZ, Japanese 〒 and more, with coverage notes for each country.
Answers next to the task
Amazon orders, USPS labels and 4PX warehouses all have their own pages, so the lookup sits where the address is actually filled.
Open for people and agents
A free JSON API and an MCP server, with no key. People use the box; agents call the same lookup.
Start with the workflow you already have.
The same data is reachable from a browser, a spreadsheet or an AI client.
Filling foreign addresses every day
Start with the lookup. Paste the address, confirm the place and format, then move on to the label.
Open the lookup 02Clearing a label queue
Use the batch page: one column in, up to 50 rows checked, then CSV out with valid, ambiguous and missing statuses.
Open batch check 03Building checkout or an agent
Call the free JSON API from your code, or connect the MCP server to Claude, Cursor, Codex or your own agent.
Connect MCPIs PostcodeDog free?
Yes. Lookups, batch checks, the JSON API and the MCP server are free and need no account.
Does PostcodeDog replace the tools on this page?
It can sit alongside them. Use the official tool when you need that country’s own mailing rules; use PostcodeDog when the address is foreign, multi-country or headed for a label.
Which countries are covered?
Eighty-two countries have postal data today. Coverage depth varies, and every country page plus the data page states what is available.
Can I suggest another comparison?
Yes. Tell us which tool you want to see next and we will review it.
See the difference in one lookup.
Try 90210, SW1A or 100-0001. No signup, no credit card.