Prooflytics vs Windsor.ai: Cheap Data Pipe vs Operational Intelligence

If you are evaluating Windsor.ai as a Supermetrics alternative, the case is straightforward — Windsor is genuinely cheaper, has 325+ connectors, and ships native Markov-chain attribution. The harder question is what Windsor does not do: it does not explain why metrics moved, does not surface competitor moves, and does not tell you what to act on. Prooflytics is the right complement (or replacement) when those gaps matter more than the connector count.

Windsor.ai is bootstrapped, runs on a small team, and charges $19/month at the Basic tier — including BigQuery and Snowflake destinations that Supermetrics charges separately for. That price has earned Windsor 3,000+ customers (Unilever, WPP, Omnicom, Publicis among them) and a 4.4/5 G2 rating. But the same reviews flag billing practices ("can't downgrade after invoice issued") and a sharp $19 → $99 jump between Basic and Standard tiers.

Quick verdict

If you only need clean data piped into Looker Studio, Power BI, or BigQuery — Windsor at $19/month is unbeatable. If you need someone (or something) to look at that data and tell you what to do, Prooflytics is the missing layer. The two stack cleanly: Windsor handles the pipe, Prooflytics handles the brain.

What is Windsor.ai?

Windsor.ai: a no-code ETL/ELT platform with 325+ connectors, all destinations on every tier (no per-destination fees), built-in multi-touch attribution (first-touch, last-touch, linear, time-decay, Markov chain), and an MCP server for accessing data from Claude / ChatGPT / Cursor. Founded 2017, HQ Switzerland, GDPR + SOC 2 Type II compliant.

The differentiators: 2× connector count vs the typical Supermetrics tier, Markov attribution that reviewers call "genuinely valuable," and the Windsor MCP — a unique feature that lets AI agents query your marketing data directly.

What is Prooflytics?

Prooflytics: a marketing intelligence platform with daily AI briefings ("why did CPL move?"), creative lifecycle classification, action queue with structured recommendations, and competitor ad intelligence on the roadmap. Built for performance marketing teams that need decisions, not just data.

Where Windsor moves data and serves it through MCP, Prooflytics consumes the same source APIs directly and outputs operational decisions — pause this ad, scale that campaign, audit this conversion event.

How they compare

When Windsor.ai is the right choice

• You have a BI analyst who consumes data downstream in Looker Studio, BigQuery, or Power BI — Windsor's destinations beat anyone at the price point.
• You explicitly want native Markov attribution as your default model — Windsor ships it, Prooflytics does not.
• You want an MCP server so external AI agents (Claude, Cursor, custom scripts) can query your marketing data — Windsor is the only ETL with this.
• You need 50+ niche connectors across SEO, finance, ecommerce, CRM — Windsor's 325+ catalog covers most edge cases.
• Budget is the constraint and you only need data to get into a dashboard, not insights to come out of one.

When Prooflytics is the right choice

• Your team's bottleneck is "what should we do" — not "where is the data." Windsor delivers data; Prooflytics delivers decisions.
• You manage paid acquisition daily and need creative lifecycle classification, action queue, and AI briefings that flag CPA drift before it becomes a client emergency.
• You want competitor ad intelligence — what creatives are competitors testing, what offers are running. Windsor has nothing here, Prooflytics has it on the roadmap.
• The Windsor billing experience worries you. Several G2 and Trustpilot reviews flag the no-downgrade-mid-billing-cycle policy as "unethical." Prooflytics uses standard Stripe Subscription Items with month-to-month flexibility.

Pricing comparison

Windsor.ai (annual billing, 20% discount):

• Free: demo only (1 source, 1 account)
• Basic: $19/mo — 3 sources, 75 accounts, 5M MAR, 5 daily syncs
• Standard: $99/mo — 10 sources, 7.5M MAR, unlimited syncs
• Plus: $249/mo — 25 sources, 10M MAR (typical mid-agency tier)
• Professional: $499/mo — 50M MAR, SSO, auto-add accounts
• Enterprise: custom

Reviews flag the 5× jump from Basic ($19) to Standard ($99) as a pain point — there is no $40-60 middle tier for slightly larger needs.

Prooflytics is in private beta with founding-customer rates. The pricing model is modular per-service (Campaign Intelligence, Weekly Update, HADI, Competitor Intel) with no per-destination, per-client, or flexpoint surcharges. Book a demo for current rates.

A solo media buyer comparing both: Windsor Basic at $19/mo gets you raw data into Looker Studio. Prooflytics adds a daily AI briefing and recommendation queue at founding-customer rates (private beta — see /pricing). Different tools, different jobs.

Can you use both?

Yes — and many should. The clean architecture:

1. Windsor.ai handles the data pipe. Your historical archive lands in BigQuery, your Looker Studio dashboards stay populated, your BI analyst keeps working.
2. Prooflytics runs the daily intelligence. Connect it directly to source platforms (Meta, Google Ads, GA4, LinkedIn) for the operational layer.

Windsor + Prooflytics together stay well below Supermetrics' typical effective TCO and significantly below Funnel.io. Prooflytics' rates are in private beta — see /pricing.

Frequently asked questions

Is Windsor.ai really $19/month or are there hidden fees?

The published $19/month Basic tier is genuinely flat — all destinations (BigQuery, Snowflake, Looker Studio, etc.) are included with no per-destination surcharge. The catches are: it's annual billing only at $19 (monthly is $23), and the limits are real (3 sources, 75 accounts). Reviewers also flag billing practices: no refund policy, can't downgrade mid-cycle. If you fit within the limits and pay annually, $19/month is the actual price.

Does Prooflytics have Markov attribution?

Not as a configurable model. Prooflytics' attribution layer is channel-aware retrieval (we pull and reconcile per-channel data — Meta, Google Ads, GA4) and surface attribution discrepancies as part of the diagnostic briefing. If your workflow specifically depends on toggling between Markov, Shapley, and time-decay models, Windsor.ai or SegmentStream (enterprise) are the right tools.

What is Windsor MCP and does Prooflytics have an equivalent?

Windsor MCP is a server that exposes your Windsor-aggregated marketing data to AI agents via the Model Context Protocol. Claude, ChatGPT, Cursor, and any MCP-compatible client can query it. It's a unique offering in the ETL category. Prooflytics does not expose an external MCP server — instead, its chat interface has built-in tools that query the same source data directly. Different architecture: Windsor exposes data for agents you build; Prooflytics is the agent.

Can I migrate from Supermetrics to Windsor.ai or Prooflytics?

To Windsor.ai: yes, mostly drop-in. Both connect to the same source platforms (Meta, Google Ads, GA4, LinkedIn) via OAuth and write to the same destinations (Looker Studio, BigQuery). You can run both in parallel and verify the numbers reconcile.

To Prooflytics: only partially. Prooflytics replaces the diagnostic and recommendation layers, not the BI / dashboard pipe. If your reporting depends on Looker Studio or BigQuery, you would replace Supermetrics with Windsor (or another ETL) and add Prooflytics for the intelligence layer.

Why does Windsor.ai have billing complaints?

The G2 and Trustpilot recurring theme is the no-downgrade-mid-cycle policy: once you've been invoiced for a higher tier, you can't reduce until renewal. Combined with no refund policy, customers feel locked in if they overestimated their needs. Windsor's small team (15-40 people) also creates support concerns — fewer humans to escalate to. None of this is unique to Windsor (Supermetrics has worse Trustpilot scores), but it is real and worth knowing before you commit annually.

Bottom line

• Pick Windsor.ai if you need cheap data movement with destination flexibility, native Markov attribution, and an MCP server for external AI tooling.
• Pick Prooflytics if you need the layer above the data — daily diagnostic briefings, action queue, competitor intelligence, all delivered as decisions not dashboards.
• Use both if you want the cheapest possible stack: Windsor for the data pipe, Prooflytics for the intelligence on top. Combined cost stays compact since Windsor handles the data pipe at $19/mo and Prooflytics layers intelligence at founding-customer rates.

If you are running paid media and your morning routine starts with "what changed yesterday" — that's the gap Prooflytics fills. Try the daily briefing on your live account and see whether the explanations match what you would have spent two hours digging up manually.