Transactional messages that deliver
every time
Deliver time-critical messages instantly across Email and SMS, with the reliability, control,
and visibility modern products need.
Loved by next-generation teams
A unified transactional messaging engine designed to send real-time alerts, updates, and system notifications, instantly and at scale.
Transactional Messaging
Send transactional messages across Email and SMS from a single platform. Manage channels centrally and keep communication consistent as you scale.
Manage every channel from one dashboard
Harp Messaging unifies Email, SMS, Push, and WhatsApp into a single, clean interface; giving your team full control without switching tools.
- Centralized channel management
- Real-time delivery tracking
- Consistent communication across platforms
- Built for reliability and scale
Deliver mission-critical emails with confidence
Power your product emails with full visibility and control. From sending domains to logs and sandbox testing, Harp gives you everything needed to ensure reliable email delivery at scale.
- View and track detailed Email Logs
- Manage and verify custom sending domains
- Send real-time transactional emails instantly
- Create reusable email templates
- Test safely using Sandbox mode
Send time-sensitive alerts instantly
Reach users in seconds with high-priority SMS notifications. Ideal for OTPs, payment alerts, account updates, and urgent system messages.
- Send transactional SMS via API
- Monitor SMS delivery status
- Manage routing and message reliability
- Scale messaging as your product grows
Engage users with real time
Deliver instant push notifications that bring users back into your product at the right moment.
- Trigger notifications based on system events
- Send scheduled or real-time alerts
- Monitor delivery and engagement
- Improve activation and retention rates
Meet users where they already are
Send transactional updates and notifications directly via WhatsApp for higher visibility and engagement.
- Deliver order updates and confirmations
- Send authentication and verification alerts
- Maintain branded communication
- Track delivery performance
Message Insights
Track delivery rates, open rates, clicks, and engagement in real time. Gain clear visibility into message performance and optimize campaigns with actionable insights.
Manage every channel from one dashboard
Harp Messaging unifies Email, SMS, Push, and WhatsApp into a single, clean interface; giving your team full control without switching tools.
- Centralized channel management
- Real-time delivery tracking
- Consistent communication across platforms
- Built for reliability and scale
Deliver mission-critical emails with confidence
Power your product emails with full visibility and control. From sending domains to logs and sandbox testing, Harp gives you everything needed to ensure reliable email delivery at scale.
- View and track detailed Email Logs
- Manage and verify custom sending domains
- Send real-time transactional emails instantly
- Create reusable email templates
- Test safely using Sandbox mode
Send time-sensitive alerts instantly
Reach users in seconds with high-priority SMS notifications. Ideal for OTPs, payment alerts, account updates, and urgent system messages.
- Send transactional SMS via API
- Monitor SMS delivery status
- Manage routing and message reliability
- Scale messaging as your product grows
Engage users with real time
Deliver instant push notifications that bring users back into your product at the right moment.
- Trigger notifications based on system events
- Send scheduled or real-time alerts
- Monitor delivery and engagement
- Improve activation and retention rates
Meet users where they already are
Send transactional updates and notifications directly via WhatsApp for higher visibility and engagement.
- Deliver order updates and confirmations
- Send authentication and verification alerts
- Maintain branded communication
- Track delivery performance
Sender ID
Create and manage your sender IDs for Email and SMS in one place. Maintain brand consistency and ensure customers recognize and trust your messages.
Manage every channel from one dashboard
Harp Messaging unifies Email, SMS, Push, and WhatsApp into a single, clean interface; giving your team full control without switching tools.
- Centralized channel management
- Real-time delivery tracking
- Consistent communication across platforms
- Built for reliability and scale
Deliver mission-critical emails with confidence
Power your product emails with full visibility and control. From sending domains to logs and sandbox testing, Harp gives you everything needed to ensure reliable email delivery at scale.
- View and track detailed Email Logs
- Manage and verify custom sending domains
- Send real-time transactional emails instantly
- Create reusable email templates
- Test safely using Sandbox mode
Send time-sensitive alerts instantly
Reach users in seconds with high-priority SMS notifications. Ideal for OTPs, payment alerts, account updates, and urgent system messages.
- Send transactional SMS via API
- Monitor SMS delivery status
- Manage routing and message reliability
- Scale messaging as your product grows
Engage users with real time
Deliver instant push notifications that bring users back into your product at the right moment.
- Trigger notifications based on system events
- Send scheduled or real-time alerts
- Monitor delivery and engagement
- Improve activation and retention rates
Meet users where they already are
Send transactional updates and notifications directly via WhatsApp for higher visibility and engagement.
- Deliver order updates and confirmations
- Send authentication and verification alerts
- Maintain branded communication
- Track delivery performance
APIs Integration
Integrate messaging directly into your apps and systems with powerful APIs. Automate message sending, trigger events, and scale communication effortlessly.
Manage every channel from one dashboard
Harp Messaging unifies Email, SMS, Push, and WhatsApp into a single, clean interface; giving your team full control without switching tools.
- Centralized channel management
- Real-time delivery tracking
- Consistent communication across platforms
- Built for reliability and scale
Deliver mission-critical emails with confidence
Power your product emails with full visibility and control. From sending domains to logs and sandbox testing, Harp gives you everything needed to ensure reliable email delivery at scale.
- View and track detailed Email Logs
- Manage and verify custom sending domains
- Send real-time transactional emails instantly
- Create reusable email templates
- Test safely using Sandbox mode
Send time-sensitive alerts instantly
Reach users in seconds with high-priority SMS notifications. Ideal for OTPs, payment alerts, account updates, and urgent system messages.
- Send transactional SMS via API
- Monitor SMS delivery status
- Manage routing and message reliability
- Scale messaging as your product grows
Engage users with real time
Deliver instant push notifications that bring users back into your product at the right moment.
- Trigger notifications based on system events
- Send scheduled or real-time alerts
- Monitor delivery and engagement
- Improve activation and retention rates
Meet users where they already are
Send transactional updates and notifications directly via WhatsApp for higher visibility and engagement.
- Deliver order updates and confirmations
- Send authentication and verification alerts
- Maintain branded communication
- Track delivery performance
Webhook
Receive real-time event updates for deliveries, opens, clicks, and failures. Keep your systems synchronized automatically with instant status notifications.
Manage every channel from one dashboard
Harp Messaging unifies Email, SMS, Push, and WhatsApp into a single, clean interface; giving your team full control without switching tools.
- Centralized channel management
- Real-time delivery tracking
- Consistent communication across platforms
- Built for reliability and scale
Deliver mission-critical emails with confidence
Power your product emails with full visibility and control. From sending domains to logs and sandbox testing, Harp gives you everything needed to ensure reliable email delivery at scale.
- View and track detailed Email Logs
- Manage and verify custom sending domains
- Send real-time transactional emails instantly
- Create reusable email templates
- Test safely using Sandbox mode
Send time-sensitive alerts instantly
Reach users in seconds with high-priority SMS notifications. Ideal for OTPs, payment alerts, account updates, and urgent system messages.
- Send transactional SMS via API
- Monitor SMS delivery status
- Manage routing and message reliability
- Scale messaging as your product grows
Engage users with real time
Deliver instant push notifications that bring users back into your product at the right moment.
- Trigger notifications based on system events
- Send scheduled or real-time alerts
- Monitor delivery and engagement
- Improve activation and retention rates
Meet users where they already are
Send transactional updates and notifications directly via WhatsApp for higher visibility and engagement.
- Deliver order updates and confirmations
- Send authentication and verification alerts
- Maintain branded communication
- Track delivery performance
Why Teams Choose
Harp Messaging
Launch transactional messaging without infrastructure complexity. Send OTPs, confirmations, and alerts from day one.
Ensure critical financial and system notifications are delivered instantly and reliably.
Deliver order confirmations, shipping updates, and payment receipts seamlessly.
Manage large-scale messaging operations with compliance, monitoring, and performance visibility.
Build better customer experiences with Harp
Whether you need marketing, transactional messaging, AI—or all three—Harp gives you the tools to create remarkable customer experiences.
The fastest growing businesses
use Harp
◆ FAQ (FAQs)
Frequently asked questions
Yes, we offer a 14-day free trial with full access to all features. No credit card required to start.
You can cancel your subscription at any time. Your access will continue until the end of your current billing period.
We offer monthly and annual billing options. Annual plans come with a 20% discount. All plans include automatic billing and can be upgraded or downgraded at any time.
All data is encrypted at rest and in transit. We use industry-standard security practices and comply with GDPR and other data protection regulations. Your data is never shared with third parties.
Yes, you can upgrade or downgrade your plan at any time. Changes take effect immediately, and we'll prorate any charges or credits.
We offer a 14-day free trial, detailed documentation, live demos, and dedicated customer support. Our implementation team can also help ensure smooth onboarding.
You'll be charged automatically at the start of each billing cycle via your preferred payment method. We accept all major credit cards and offer invoicing for annual plans.