Best Bulk SMS Software

Twilio is a cloud communications platform that gives developers APIs to add messaging, voice calling, video, email, and authentication features to their applications. Core products include Programmable SMS and MMS, Voice, Video, WhatsApp and RCS messaging, the SendGrid Email API, and Verify for two-factor authentication, alongside Flex for building contact centers and Segment for customer data management. Companies including Uber, Airbnb, Netflix, and HubSpot use Twilio to power customer communications.

Pricing is usage-based rather than flat subscription tiers: SMS costs around $0.0083 per message, voice starts near $0.0085 per minute to receive, and phone numbers start around $1.15 per month, with volume discounts at scale. SendGrid Email offers a free plan for up to 100 emails per day, and Twilio provides a free trial with no credit card required for new developers to test the platform.

Sinch is a Swedish cloud communications platform offering SMS, Voice, Email, and WhatsApp Business APIs that let developers embed messaging and calling into their products. Its Conversation API connects to more than a dozen channels, including RCS, Facebook Messenger, Instagram, and Viber, through a single integration, with automatic fallback to SMS if a richer channel fails to deliver.

Sinch charges on a pay-as-you-go basis, with US SMS starting at $0.0078 per message and outbound voice from $0.01 per minute, alongside its no-code Sinch Engage messaging platform, which offers a free trial. The company operates over 600 direct carrier connections and serves businesses from startups to large enterprises worldwide.

Infobip is a global cloud communications platform, founded in Croatia, that provides SMS, WhatsApp, RCS, Voice, Video, and Email APIs along with higher-level products such as Moments for marketing automation, Answers for AI chatbots, and Conversations for cloud contact centers. It owns and operates much of its own carrier infrastructure, with more than 800 direct-to-carrier connections across 190-plus countries.

Infobip does not publish standard pricing tiers; instead it quotes rates based on channel mix, message volume, and destination country, though a 60-day free trial gives new users 100 free messages per channel plus 15 free voice calls. It primarily serves mid-market and enterprise customers alongside developers building on its CPaaS X API stack.

Plivo is a cloud communications platform offering programmable Voice, SMS, WhatsApp, and Verify APIs, plus SIP trunking and no-code Voice AI Agents, aimed at developers building calling and messaging into their applications. New accounts get $10 in free credit with no credit card required, and Plivo covers voice and messaging across more than 190 countries.

The self-service Pay as You Go tier covers the US and India with usage-based pricing, such as SMS from $0.0077 per message, while the Team plan starts at $250 per month and Enterprise starts at $1,000 per month, adding WhatsApp, custom sender IDs, and compliance features like HIPAA and SSO for larger organizations.

Telnyx is a carrier-owned communications platform providing Voice, SMS, SIP Trunking, Verify, and AI voice agent APIs on its own private Tier-1 network across more than 40 countries. Because it owns its infrastructure rather than reselling it, Telnyx offers direct carrier interconnects, built-in encryption, and STIR/SHAKEN call attestation without extra reseller hops.

Pricing is pay-as-you-go with no mandatory monthly platform fee: SMS starts from $0.004 per message and outbound SIP trunking starts at $0.005 per minute, plus a Growth Plan commitment that unlocks an 8% discount. Telnyx includes free 24/7 in-house support and serves developers ranging from indie builders to large enterprises.