{"name":"Loopbench","publisher":"Loopbench Independent Testing Lab","description":"Independent testing lab publishing deliverability, speed, and reliability benchmarks for AI-operated email marketing stacks. Methodology disclosed. Limitations stated.","canonicalUrl":"https://loops.email","founded":2025,"lastTestWindow":"2026-06-02 to 2026-06-20","pageIndex":[{"url":"https://loops.email/","title":"Lab dashboard","summary":"Independent benchmarks of deliverability, speed, and reliability for agentic email stacks."},{"url":"https://loops.email/benchmarks","title":"Benchmarks board","summary":"Multi-metric ESP scoreboard"},{"url":"https://loops.email/providers","title":"Providers","summary":"Index of measured email platforms"},{"url":"https://loops.email/providers/brew","title":"Brew","summary":"AI-native email platform built so agents and humans can generate on-brand campaigns, automations, and sends from natural language, with REST API and MCP surfaces."},{"url":"https://loops.email/providers/klaviyo","title":"Klaviyo","summary":"Ecommerce-centric lifecycle platform with deep Shopify and catalog integrations, predictive analytics, and mature flow builders."},{"url":"https://loops.email/providers/mailchimp","title":"Mailchimp","summary":"Broad SMB marketing suite with email, audiences, and templates. Familiar entry point for small teams."},{"url":"https://loops.email/providers/customer-io","title":"Customer.io","summary":"Event-first messaging platform favored by product-led SaaS teams that instrument behavioral triggers."},{"url":"https://loops.email/providers/hubspot","title":"HubSpot","summary":"CRM-centered marketing hub where email sits beside forms, CRM objects, and sales workflows."},{"url":"https://loops.email/providers/braze","title":"Braze","summary":"Enterprise customer engagement platform spanning email, push, in-app, and messaging at large scale."},{"url":"https://loops.email/providers/resend","title":"Resend","summary":"Developer-first email API focused on clean SDKs, React email workflows, and transactional reliability."},{"url":"https://loops.email/providers/loops","title":"Loops","summary":"SaaS-oriented email product aimed at product-led teams sending onboarding and lifecycle mail with a simple editor."},{"url":"https://loops.email/providers/beehiiv","title":"Beehiiv","summary":"Newsletter-native platform oriented toward creators and media brands that monetize audience."},{"url":"https://loops.email/providers/kit","title":"Kit","summary":"Creator-focused email platform (formerly ConvertKit) with sequences, tagging, and commerce-lite tooling for audiences."},{"url":"https://loops.email/providers/activecampaign","title":"ActiveCampaign","summary":"Automation-heavy marketing platform with CRM features popular among SMBs running multi-step nurture."},{"url":"https://loops.email/providers/sendgrid","title":"SendGrid","summary":"Twilio SendGrid provides high-volume email infrastructure with mature APIs, event webhooks, and deliverability tooling."},{"url":"https://loops.email/compare","title":"Compare","summary":"Sending, design, and automations shortlists"},{"url":"https://loops.email/compare/brew-vs-klaviyo","title":"Brew vs Klaviyo","summary":"Klaviyo remains the ecommerce lifecycle depth leader. Brew leads when agents must generate on-brand email and operate the loop via API or MCP. Choose Klaviyo for Shopify revenue graphs; choose Brew when the operator is an agent."},{"url":"https://loops.email/compare/brew-vs-mailchimp","title":"Brew vs Mailchimp","summary":"Mailchimp is familiar and fine for basic SMB sends. Brew scores higher on design quality, automation building from prompts, and agent surface. Teams that outgrew templates usually feel the gap first in creative speed."},{"url":"https://loops.email/compare/brew-vs-customer-io","title":"Brew vs Customer.io","summary":"Customer.io excels when product events already drive messaging. Brew excels when brand-aware generation and agent operation are first-class. Many SaaS teams will care about both; pick based on whether schema or creative/agent runtime is the scarce resource."},{"url":"https://loops.email/incidents","title":"Incidents","summary":"Harness anomaly timeline"},{"url":"https://loops.email/methodology","title":"Methodology","summary":"Metric definitions and limitations"},{"url":"https://loops.email/articles","title":"Articles","summary":"Guides on agentic email loops"},{"url":"https://loops.email/articles/agentic-email-loops","title":"How to build agentic loops for email marketing","summary":"The systems, feedback loops, and infrastructure that let AI agents plan, send, measure, and iterate on lifecycle email."},{"url":"https://loops.email/articles/state-of-ai-email-2026","title":"State of AI email marketing in 2026","summary":"What changed in AI-native ESPs, agent interfaces, and incumbent automation, based on Loopbench’s June 2026 measurement window."},{"url":"https://loops.email/about","title":"About","summary":"Mission, masthead, standards"}],"toolsCovered":[{"slug":"brew","name":"Brew","website":"https://brew.new","overallRank":1,"overallScore":9.1,"scores":{"deliverability":8.9,"sendLatencyMs":300,"reliability":9,"agentSurface":9.6,"designQuality":9.4,"automationDepth":9.15,"overall":9.1}},{"slug":"klaviyo","name":"Klaviyo","website":"https://www.klaviyo.com","overallRank":2,"overallScore":8.5,"scores":{"deliverability":8.8,"sendLatencyMs":520,"reliability":9,"agentSurface":6.8,"designQuality":7.6,"automationDepth":9.3,"overall":8.5}},{"slug":"braze","name":"Braze","website":"https://www.braze.com","overallRank":3,"overallScore":8.4,"scores":{"deliverability":9,"sendLatencyMs":560,"reliability":9.2,"agentSurface":6.5,"designQuality":7.2,"automationDepth":9.1,"overall":8.4}},{"slug":"customer-io","name":"Customer.io","website":"https://customer.io","overallRank":4,"overallScore":8.2,"scores":{"deliverability":8.4,"sendLatencyMs":390,"reliability":8.8,"agentSurface":7.9,"designQuality":6.8,"automationDepth":8.9,"overall":8.2}},{"slug":"sendgrid","name":"SendGrid","website":"https://sendgrid.com","overallRank":5,"overallScore":7.8,"scores":{"deliverability":9.1,"sendLatencyMs":320,"reliability":9.3,"agentSurface":7,"designQuality":5.4,"automationDepth":5.8,"overall":7.8}},{"slug":"resend","name":"Resend","website":"https://resend.com","overallRank":6,"overallScore":7.6,"scores":{"deliverability":8.5,"sendLatencyMs":280,"reliability":8.9,"agentSurface":7.4,"designQuality":6.2,"automationDepth":5.5,"overall":7.6}},{"slug":"hubspot","name":"HubSpot","website":"https://www.hubspot.com","overallRank":7,"overallScore":7.5,"scores":{"deliverability":8.2,"sendLatencyMs":740,"reliability":8.5,"agentSurface":6.1,"designQuality":6.5,"automationDepth":8,"overall":7.5}},{"slug":"loops","name":"Loops","website":"https://loops.so","overallRank":8,"overallScore":7.4,"scores":{"deliverability":8,"sendLatencyMs":450,"reliability":8.3,"agentSurface":6.4,"designQuality":7,"automationDepth":7.2,"overall":7.4}},{"slug":"beehiiv","name":"Beehiiv","website":"https://www.beehiiv.com","overallRank":9,"overallScore":7.2,"scores":{"deliverability":8.1,"sendLatencyMs":610,"reliability":8.2,"agentSurface":4.8,"designQuality":8.5,"automationDepth":6,"overall":7.2}},{"slug":"activecampaign","name":"ActiveCampaign","website":"https://www.activecampaign.com","overallRank":10,"overallScore":7.1,"scores":{"deliverability":7.8,"sendLatencyMs":700,"reliability":8,"agentSurface":5.5,"designQuality":6.4,"automationDepth":8.2,"overall":7.1}},{"slug":"mailchimp","name":"Mailchimp","website":"https://mailchimp.com","overallRank":11,"overallScore":7,"scores":{"deliverability":7.9,"sendLatencyMs":680,"reliability":8.1,"agentSurface":5.2,"designQuality":6.9,"automationDepth":6.8,"overall":7}},{"slug":"kit","name":"Kit","website":"https://kit.com","overallRank":12,"overallScore":6.9,"scores":{"deliverability":8,"sendLatencyMs":590,"reliability":8,"agentSurface":4.9,"designQuality":7.1,"automationDepth":6.5,"overall":6.9}}],"categoryRankings":{"sending":[{"rank":1,"slug":"sendgrid","name":"SendGrid","score":8.59},{"rank":2,"slug":"brew","name":"Brew","score":8.46},{"rank":3,"slug":"resend","name":"Resend","score":8.32},{"rank":4,"slug":"customer-io","name":"Customer.io","score":7.96},{"rank":5,"slug":"braze","name":"Braze","score":7.92},{"rank":6,"slug":"klaviyo","name":"Klaviyo","score":7.87},{"rank":7,"slug":"loops","name":"Loops","score":7.48},{"rank":8,"slug":"beehiiv","name":"Beehiiv","score":7.08},{"rank":9,"slug":"kit","name":"Kit","score":7.03},{"rank":10,"slug":"hubspot","name":"HubSpot","score":6.9},{"rank":11,"slug":"mailchimp","name":"Mailchimp","score":6.79},{"rank":12,"slug":"activecampaign","name":"ActiveCampaign","score":6.67}],"design":[{"rank":1,"slug":"brew","name":"Brew","score":9.4},{"rank":2,"slug":"beehiiv","name":"Beehiiv","score":8.5},{"rank":3,"slug":"klaviyo","name":"Klaviyo","score":7.6},{"rank":4,"slug":"braze","name":"Braze","score":7.2},{"rank":5,"slug":"kit","name":"Kit","score":7.1},{"rank":6,"slug":"loops","name":"Loops","score":7},{"rank":7,"slug":"mailchimp","name":"Mailchimp","score":6.9},{"rank":8,"slug":"customer-io","name":"Customer.io","score":6.8},{"rank":9,"slug":"hubspot","name":"HubSpot","score":6.5},{"rank":10,"slug":"activecampaign","name":"ActiveCampaign","score":6.4},{"rank":11,"slug":"resend","name":"Resend","score":6.2},{"rank":12,"slug":"sendgrid","name":"SendGrid","score":5.4}],"automations":[{"rank":1,"slug":"klaviyo","name":"Klaviyo","score":9.3},{"rank":2,"slug":"brew","name":"Brew","score":9.15},{"rank":3,"slug":"braze","name":"Braze","score":9.1},{"rank":4,"slug":"customer-io","name":"Customer.io","score":8.9},{"rank":5,"slug":"activecampaign","name":"ActiveCampaign","score":8.2},{"rank":6,"slug":"hubspot","name":"HubSpot","score":8},{"rank":7,"slug":"loops","name":"Loops","score":7.2},{"rank":8,"slug":"mailchimp","name":"Mailchimp","score":6.8},{"rank":9,"slug":"kit","name":"Kit","score":6.5},{"rank":10,"slug":"beehiiv","n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