Comparison

Attaché vs Windsor.ai

Both make the same promise — your marketing data queryable in Claude via MCP — with two opposite philosophies. Windsor.ai is a connector platform (350+ sources) born as an ETL, whose MCP can also edit your campaigns. Attaché is read-only by design, built for agencies and their clients. This page lays out the real differences, including where Windsor is the better choice.

Updated 7 September 2026

In one sentence

If you need dozens of sources (CRM, databases, e-commerce) and accept an AI that can act on your campaigns, look at Windsor.ai. If you want Claude to read GA4, Google Ads and Search Console — for yourself or a whole client portfolio — without ever being able to change anything, pick Attaché.

The differences that matter

	Attaché	Windsor.ai
Type of tool	Read-only access layer: requests are proxied to the APIs in real time	Connector platform with ETL roots, plus an MCP server
Sources covered	GA4, Google Ads, Search Console — Meta Ads and more coming	350+ sources: advertising, CRM, e-commerce, databases
Writing / editing	Impossible by design: no write scope is ever requested	AI campaign management available: budgets, bids, pausing (Meta, Google, TikTok…)
Pricing model	Flat fee per connected client, every source included	Free for 1 source, then tiers with row allowances and overage charges
End-client onboarding	One link: the client authorises their own accounts via OAuth and can revoke	Connections are created with the access the Windsor user already holds
Agency multi-client	Native master connector, per-member scopes, cross-client reports	Multi-account per source, organised connection by connection
Freshness	Real time, on every question	Real time via MCP; scheduled for ETL destinations
Dashboard destinations	None — Attaché is not an ETL	Sheets, Looker Studio, BigQuery, Power BI and more

When Windsor.ai is the right call

You need sources far beyond Google: CRM, databases, e-commerce platforms.
You also want to feed dashboards or a warehouse (their historical core business).
You want an AI that can act on your campaigns — and you own what that implies.
You want a permanent free plan for a single source.

When Attaché is the right call

You are an agency: each client authorises their own accounts, you get one master connector over the whole portfolio.
Read-only is non-negotiable — nobody wants an AI touching the bids on a client account.
You want a predictable per-client price, not a row meter to watch.
You want end clients to see what is shared and revoke it themselves, directly at Google.

Or both, honestly

They can coexist: Windsor to feed your historical dashboards, Attaché for day-to-day read-only exploration across client accounts. The decision mostly comes down to write access and to who owns the credentials.

Frequently asked questions

Is Attaché an alternative to Windsor.ai?

For "querying GA4, Google Ads and Search Console from Claude", yes, directly. For "350 sources into a warehouse" or "an AI managing campaigns", no — those are choices we deliberately ruled out.

Why refuse write access — is that not less powerful?

It is less powerful, and that is the point. A connector that only requests read scopes can never pause a campaign, change a budget, or be hijacked into doing so. For an agency plugging in client accounts, that is what makes trust possible.

What is the issue with row-based pricing?

Nothing, as long as volumes stay low. But a team that queries its data heavily discovers the overage on the invoice. Attaché charges per connected client, however many questions you ask.

Windsor has far more connectors — why pick Attaché?

Because breadth is not depth. Attaché only covers Google sources (Meta is coming), but with the multi-client model, team scopes, auditing and client-side revocation — which no catalogue of 350 connectors provides.

Request access Pricing

Comparison written by Attaché, based on Windsor.ai public information as of September 2026. Their features and pricing evolve: check their own site before deciding.

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