Mailsend vs. Mailster Comparison Chart

Klaviyo is the AI-first B2C CRM platform that helps you grow by integrating marketing, analytics, and customer service in one solution. Powered by unified data and built-in AI, it's faster and easier than ever to create personalized, lasting customer relationships. Klaviyo unifies your customer profiles by capturing every event, and then lets you orchestrate your email marketing, SMS marketing, push notifications, WhatsApp, and RCS campaigns in one place. Built-in AI agents plan and launch campaigns, personalize every send, answer questions, and resolve issues. With real-time attribution and insights, you'll be able to make smarter, faster decisions that drive ROI. Trusted by more than 170,000 businesses, Klaviyo can grow your business while keeping operations simple and customer relationships strong

Designed specifically for nonprofit organizations and membership associations, Neon CRM is a constituent management platform that offers a comprehensive view of supporters and members, which allows you to engage more meaningfully and bring in more revenue. With Neon CRM you can easily manage fundraising campaigns, events, communications, and more, while gaining valuable insights into your organization through intuitive reporting and administrative tools. Create an enhanced and memorable generosity experience with unlimited forms and templates, popular payment methods, and personalized emails. Streamline your organization's processes by automating email marketing, workflows, volunteer management, and payment processing, so that you can spend less time on administrative tasks, and focus more on driving your mission forward.

Dependable cloud based email hosting with spam filtering, antivirus protection, generous storage and webmail. Compatible with Outlook and all other POP3/IMAP clients. High volume SMTP service for responsible senders. Outbound relay service for transactional messages, email marketing campaigns, newsletters and other applications. Dedicated email servers, clustering and multiple IP load balancing for high volume senders. Fixed monthly cost with unlimited sending and reputation monitoring. Greatmail is an email service provider (ESP) specializing in business class email hosting, SMTP hosting and email servers. For ISPs, application programmers and cloud developers, we also provide custom solutions including dedicated IP servers and process specific, load balanced configurations with multiple servers.

Knak is the no-code platform that empowers self-sufficient marketing teams to create beautiful, on-brand emails and landing pages — without relying on developers or agencies. Built for speed and collaboration, Knak streamlines campaign production with modular templates, real-time editing, simple collaboration, and seamless integrations with leading MAPs like Adobe Marketo Engage, Salesforce Marketing Cloud, Oracle Eloqua, and more. Whether you're supporting global teams or launching fast-turn campaigns, Knak helps you go from brief to build in minutes—not weeks. Say goodbye to bottlenecks and hello to marketing agility.

Send messages your customers want to read (and act on). Attentive’s AI-powered SMS & email platform helps retail enterprises to e-commerce entrepreneurs engage customers and drive billions in revenue. We'll help you target the right audience and measure your most important metrics to optimize your marketing program. And with over 100 flexible integrations, you can seamlessly connect to the rest of your marketing stack. We partner with industry innovators in retail & e-comm, food & beverage, and media & entertainment. Attentive’s AI-powered SMS & email platform will double your ROI in just a few months. Learn more about our free 30-day trial.

SalesTarget.ai is the all-in-one sales game-changer that helps you discover, engage, and close more deals—faster. With Lead Explorer, you get instant access to 50M+ verified B2B leads across industries, complete with advanced filters to zero in on your perfect prospects. Our powerful Cold Email Outreach module lets you connect unlimited email accounts, automate outreach at scale, and maintain top deliverability. Plus, our built-in AI-powered CRM is designed so your entire sales flow—leads, emails, pipelines, tasks, and follow-ups—works seamlessly in one place. The latest innovation is Co-pilot, your AI sidekick that generates lead lists, writes sequences, and even schedules campaigns for you—so you can focus on closing, not managing tools. Whether you’re a start-up, sales team, or agency, SalesTarget.ai gives you everything you need to supercharge growth in one powerful platform.

GetResponse provides all-in-one marketing software that empowers marketers, solopreneurs, coaches, creators, and small business owners with affordable, easy-to-use tools for email marketing, marketing automation, and content monetization. With over 25 years of expertise, GetResponse goes beyond email with tools to help grow and engage audiences, create and sell courses, and turn ideas into income. It’s the go-to solution for building a personal brand, selling products and services, and fostering a loyal community.

Admiral's Visitor Relationship Management (VRM) platform drives visitor relationships and revenue for news and media publishers. The solution combines subscriptions & paywalls, consent mgmt, adblock recovery, email and social growth tools, authentication, a first-party data engine, and more. Admiral delivers the right offer, at the right time, at every visitor touchpoint. No code is required, with a one-tag install, and amazing support. Admiral VRM delivers: -Adblock revenue recovery -Paywall and paid subscription management, -Registration wall and building first-party data sets, -Grow email newsletter signups, social media follows, and app downloads, -Donation campaigns, -GDPR and GPP Privacy Consent Management, CMP Admiral’s analytics dashboards, journey builders, segmentation, and targeting, all help publishers reach business objectives. Admiral is an Inc 5000 Company

WiseStamp is an award-winning, enterprise-grade email signature management solution designed to scale with the needs of market-leading organizations. Trusted by over 1.2 million customers worldwide, WiseStamp enables businesses to centrally create, manage, and deploy professional, on-brand email signatures effortlessly. WiseStamp turns every email into a powerful brand asset, enabling enterprises to maintain brand consistency, enhance engagement, and drive business impact at scale. WiseStamp also works seamlessly with all email platforms - no coding needed! Turn every email into an opportunity. Make it count.

CallHub is a digital organizing platform empowering political campaigns, nonprofits, advocacy groups, unions, and businesses with scalable outreach via calling, texting, email, and automation. The platform offers Predictive Dialer for high-volume campaigns, Power Dialer for personalized calls, and Auto Dialer. AI-powered Smart Insights categorize call sentiments. Dynamic Caller ID, Spam Shield, and SHAKEN/STIR compliance maximize answer rates. Text capabilities include Peer-to-Peer Texting, Text Broadcasts, and Text-to-Join with SMS/MMS support, URL tracking, and automated responses. Workflows automation enables multi-channel campaigns. The mobile app allows volunteers join campaigns from smartphones. CRM integrations with NationBuilder, NGP VAN, Salesforce, and Blackbaud ensure seamless sync. CallHub is SOC 2, ISO 27001, GDPR, and TCPA compliant. Trusted by 200,000+ campaigns, it has facilitated 1 billion calls and 750 million texts.