Validity Engage (formerly Litmus)
Email previews, testing and collaboration for email teams.
Best for: Email marketing teams QA-ing campaigns across inboxes.
Search and filter 816 marketing tools by category, price, business type, and features.
Ranked by Overall Score: our Editor Rating and Market Signal, 50/50. Market Signal uses Ahrefs and Semrush data through September 2026, pulled October 6 to 19, 2026. How we score
98 tools · page 3 of 3
Email previews, testing and collaboration for email teams.
Best for: Email marketing teams QA-ing campaigns across inboxes.
Cold-email platform with inbox rotation, deliverability monitoring, conditional sequences, and centralized replies.
Best for: B2B sales teams and agencies running cold outreach across multiple mailboxes while monitoring deliverability and reply handling.
WordPress security platform focused on vulnerability intelligence, virtual patching, and plugin-level protection.
Best for: WordPress site owners, agencies, and hosting providers that want vulnerability-focused protection and virtual patches for plugins and themes.
Open-source publishing platform with newsletters, memberships, subscriptions, analytics, and extensible APIs.
Best for: Independent publishers, newsletters, and membership businesses that want website publishing, email delivery, and paid subscriptions under their own brand.
Customer data and marketing automation platform joining journeys, analytics, email, SMS, and audience profiles.
Best for: SaaS and digital businesses that want lifecycle automation, customer data, and reporting tied together around behavior-based journeys.
Continuous vulnerability management platform for external infrastructure, cloud environments, and web applications.
Best for: Small and midsize security teams that need recurring vulnerability scanning and prioritization across external infrastructure and cloud assets.
Source code search engine that finds websites by technology, script, cookie or HTML snippet.
Best for: Sales and research teams building prospect lists of companies that run a specific script or tech stack.
Email verifier and list cleaner.
Best for: Teams cleaning email lists before campaigns.
Email deliverability and inbox placement testing.
Best for: Email senders diagnosing why messages land in spam.
Sales engagement platform for cold email, calling, LinkedIn tasks and lead follow-up.
Best for: Sales development teams and agencies that want structured cold outreach with email plus phone and LinkedIn steps.
Cold-outreach platform with sender infrastructure, automated warmup and centralized replies.
Best for: Sales teams and outbound agencies operating large mailbox pools and wanting deliverability, replies, calling, and CRM activity centralized.
Visual email builder generating responsive HTML for 50-plus clients with direct ESP uploads.
Best for: Marketing teams that want to design reusable responsive email templates before pushing them into an existing sending platform.
Competitive enablement platform for collecting intelligence, building battlecards, and delivering competitor guidance into seller workflows.
Best for: Competitive enablement teams that need battlecards and curated competitor insights embedded into sales and revenue workflows.
Continuous pentest platform pairing AI-driven DAST scanning with expert-led penetration testing.
Best for: SaaS companies and engineering teams that need recurring pentests and compliance-ready reports for SOC 2 or ISO 27001 audits.
ASO platform from SplitMetrics with keyword tracking and a bulk store listing editor.
Best for: App developers who update store listings in many languages and want to skip the store consoles.
Multichannel sales-engagement platform combining prospecting, email and LinkedIn.
Best for: SDR teams and outbound sales organizations coordinating email, LinkedIn, calling, CRM activity, and AI-assisted prospecting.
Ecommerce messaging platform combining email, SMS, reviews and onsite forms.
Best for: Ecommerce brands that want email, SMS and product reviews tied closely to store purchase behavior.
Application security platform covering web, API and mobile.
Best for: Security teams that need coordinated testing and monitoring across web applications, APIs, mobile apps, and exposed digital assets.
Browser extension that reveals a site's CMS, frameworks, plugins, fonts and trackers in one click.
Best for: Developers, designers and marketers who want a quick look at another site's stack while browsing.
External attack-surface and application security testing driven by automated scans and security researcher findings.
Best for: Application-security and security teams that need continuous testing of internet-facing web assets and externally exposed attack surfaces.
Competitive intelligence platform for monitoring market signals, synthesizing competitor changes, and distributing sales-ready insights.
Best for: Competitive intelligence and enablement teams that need continuous competitor monitoring plus battlecards and distributed market insights.
Cross-channel customer engagement platform with journey orchestration, unified profiles, personalization, and Nova intelligence.
Best for: Enterprise lifecycle and growth teams coordinating personalized messaging across multiple digital channels from shared customer data.
Collaborative email-design system with reusable components, live editing, approvals, and ESP synchronization.
Best for: Email design and lifecycle teams that need strict brand consistency, reusable modules, and structured stakeholder approval.
Centralized email-production platform with modular design, approvals and localization.
Best for: Lifecycle and enterprise email teams managing reusable designs, approvals, localization, and multiple sending platforms.
Sectigo-owned website security service that scans for malware, removes infections and patches vulnerabilities.
Best for: Small business and WordPress site owners who want malware cleanup handled for them after a hack.
NETSCOUT's Arbor DDoS line: Sightline, TMS, Arbor Edge Defense and the Arbor Cloud scrubbing service.
Best for: Internet service providers, hosting companies and large enterprises that run their own networks and data centers.