Best Bulk SMS Software for Startups

ActiveCampaign enables you to execute large-scale SMS marketing initiatives while maintaining a personal touch. Leverage segments, personalized fields, and conditional content to customize your offers, and seamlessly integrate SMS into your automation workflows for product launches, limited-time sales, or event notifications. The AI SMS Builder assists you in crafting brief, compliant messages that resonate with your audience and align with your brand identity.

Klaviyo empowers businesses to create smarter digital relationships by transforming customer data into meaningful, impactful experiences. From email and SMS to web interactions and reviews, Klaviyo makes it easy for B2C brands to engage customers at every touchpoint. Trusted by over 157,000 businesses, Klaviyo helps drive faster, more efficient revenue growth. Klaviyo’s 350+ integrations making getting started easy for marketers. Some key features of the platform include predictive analytics, AI automation, optimized templates, A/B testing, and intuitive segmentation and email flows to ensure marketers are reaching their audience with the right message at the right time. The solution also supports integration with payment processing and point of sale (POS) software solutions, such as Magento, Shopify, and WooCommerce.

ClickSend: A simple, battle-tested SMS API built for developers. Ship messaging features in minutes with a clean API, reliable infrastructure and zero lock-ins. Why devs and sysadmins trust us: - Direct carrier routes to 190+ countries — no middleman - 99.95%+ uptime, low latency, high throughput - Billions of messages delivered globally - Pay-as-you-go pricing — no contracts - 24/7 support from people who actually understand APIs Works the way you code: Integrate via REST API, use pre-built SDKs (PHP, Python, Ruby, Node.js, C#), or trigger via webhooks. Already using Zapier, Make, or Power Automate? We've got you covered with pre-built integrations ready to go. It works straight out of the box — and keeps working when you scale from 100 to 100 million messages. No lock-ins. No fuss. Just reliable SMS infrastructure you can trust. Perfect for: 2FA, alerts, monitoring notifications, transactional messaging, user onboarding flows and anything else that needs to reach people fast.

Introducing Brevo, previously known as Sendinblue — your go-to platform for enhancing customer connections through various channels like Email, SMS, and Chat. This comprehensive toolkit is designed to transform casual visitors into loyal customers. Engage your audience by reaching them directly in their inboxes with visually appealing email campaigns, and send tailored messages that go right into your customers' hands. Brevo enables businesses to cultivate and strengthen relationships through tools such as marketing automation, email outreach, transactional messaging, and SMS services. What sets us apart? Our exceptional customer happiness team drives Brevo, and our flexible pricing plans are sure to bring a smile to your face. With a seamless integration of diverse services in a single, easy-to-use platform, we strive to make your sending experience enjoyable and effective!

All the tools you need in a single platform. Capture leads using our landing pages, surveys, forms, calendars, inbound phone system & more. Automately message leads via voicemails, SMS, email, FB Messenger, and forced calls. Our built-in tools allow you to collect payments, schedule appointments, track analytics, and keep track of your data. HighLevel is a Full-Suite Platform for Agencies. The Platform includes a fully featured Page Builder to help you capture leads. You can create fully featured websites with custom menus using our intuitive platform. All you need to create high-performing, captivating landing pages in one place. You can capture leads via Surveys and capture forms. You can either integrate directly with our page builder, or embed them on one of your own websites. For many businesses, the first step is to request appointments and capture appointments. HighLevel has our own calendar application.