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Head-to-head · Email Marketing Analytics Software

Windsor.ai vs Sendlens

  • Updated Oct 2026
  • Both researched from official sources
  • 6 checks side by side
Higher score Windsor.ai #4 in Email Marketing Analytics Software 8.5/10 Free plan · 30-day trial Free planFree trial✓ 4 of 4 features Visit Windsor.ai
Sendlens #26 in Email Marketing Analytics Software 6.3/10 Free plan Free plan✓ 3 of 4 features Visit Sendlens

Windsor.ai leads on 1 check, Sendlens on 0, and 5 are even. Who comes out ahead on the 6 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreWindsor.ai · 8.5/10
  • Free planboth
  • Free trialonly Windsor.ai
  • Most featuresWindsor.ai · 4 of 4

Windsor.ai scores higher on our rubric for email marketing analytics software: 8.5 against 6.3 out of 10; our editors rank them #4 and #26.

Windsor.ai leads on connected platforms: 3 platforms versus 2 platforms. On attribution models, Windsor.ai gives you Multi-touch where Sendlens offers Single-touch.

Windsor.ai is the better fit for data teams aggregating email performance sources. Sendlens is the better fit for teams focused on comparative email performance.

  • Windsor.ai fits best

    Data teams aggregating email performance sources

  • Sendlens fits best

    Teams focused on comparative email performance

Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.

Side by side

Feature Windsor.ai 8.5/10 Visit ↗ Sendlens 6.3/10 Visit ↗
At a glance
Editor score 8.5 6.3
Ranking #4 in Email Marketing Analytics Software #26 in Email Marketing Analytics Software
Best for Data teams aggregating email performance sources Teams focused on comparative email performance
Pricing model Free plan + paid Free plan + paid
Starting price $19/mo €29/mo
Free plan ✓ ✓
Free trial 30 days —
Deployment Cloud Cloud
Platforms Web Web
Support Email, Live chat, Phone, Community, Docs Email
Integrations 6,500+ integrations 2 integrations
Built for Solo, Small business, Mid-market, Enterprise Small business, Mid-market
Features Windsor.ai 4/4 · Sendlens 3/4
Revenue tracking ✓ ✓
Ecommerce tracking ✓ (best) Not checked yet
Campaign comparison ✓ ✓
Optimization insights ✓ ✓
Specs
Historical data 120 months Not checked yet
Connected platforms 3 platforms (best) 2 platforms
Attribution models Multi-touch Single-touch
Our review
Pros
  • Connects 350+ marketing, CRM, ecommerce, and analytics sources
  • Supports multi-touch email revenue attribution with GA4 data
  • Delivers data to BI tools, warehouses, spreadsheets, APIs, and AI assistants
  • Clusters campaigns for apples-to-apples performance comparisons
  • Tracks conversion and revenue attribution by campaign and cluster
  • Free plan includes unlimited sync and clusters with no credit card required
Cons
  • Email analytics depends on combining external platform and business data
  • The Free plan supports only 1 data source and 5 destination tasks
  • Advanced capacity costs more as sources, accounts, and sync needs grow
  • Live integrations are limited to ActiveCampaign and Brevo
  • Free users receive 10 fingerprint credits
  • Attribution uses a single-touch model
Our verdict

Windsor.ai is a cloud data integration and marketing analytics platform for analysts, agencies, data teams, and larger organizations. It connects email platforms with CRM, ecommerce, sales, and analytics data, then sends the results to BI…

Read the review →

Sendlens is a hosted email marketing analytics platform for email marketers, SME marketing managers, and freelance or agency operators. It connects with email service providers, normalizes campaign data, fingerprints email content across…

Read the review →
  1. Windsor.aiEmail Marketing Analytics Software 8.5Free plan · 30-day trial
  2. SendlensEmail Marketing Analytics Software 6.3Free plan

Strengths and trade-offs

  • Windsor.ai — where it wins

    • Connects 350+ marketing, CRM, ecommerce, and analytics sources
    • Supports multi-touch email revenue attribution with GA4 data
    • Delivers data to BI tools, warehouses, spreadsheets, APIs, and AI assistants

    Where it doesn't

    • Email analytics depends on combining external platform and business data
    • The Free plan supports only 1 data source and 5 destination tasks
    • Advanced capacity costs more as sources, accounts, and sync needs grow

  • Sendlens — where it wins

    • Clusters campaigns for apples-to-apples performance comparisons
    • Tracks conversion and revenue attribution by campaign and cluster
    • Free plan includes unlimited sync and clusters with no credit card required

    Where it doesn't

    • Live integrations are limited to ActiveCampaign and Brevo
    • Free users receive 10 fingerprint credits
    • Attribution uses a single-touch model

More comparisons

All email marketing analytics software comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update