Best SMS API Providers for Calendly

Notifyre offers a versatile SMS API that follows the REST architecture, allowing you to send, schedule, and receive text messages directly through your applications. The service comes with dedicated SDKs for .NET and Node.js, along with comprehensive quickstart documentation. It features token-based authentication for different environments and provides real-time webhooks equipped with HMAC signature verification to track delivery statuses and manage inbound SMS and MMS messages. The API endpoints facilitate message sending and scheduling, delivery tracking, number and sender ID management, as well as bulk contact imports. Users are charged based on usage at a rate of 2 cents per SMS, which includes carrier fees; there are no platform fees, and inbound replies are free. Wallet funds do not expire, and Notifyre assists with the registration of US carriers (10DLC) to ensure consistent API traffic delivery. The infrastructure boasts an impressive 99.99% uptime, is ISO 27001 certified, and complies with HIPAA regulations using AES 256-bit encryption for data security. With a solid rating of 4.7 out of 5 from 1,187 reviews, Notifyre distinguishes itself from larger SMS API providers by offering local U.S. support via live chat and phone, along with a dedicated account manager, ensuring prompt assistance without the hassle of ticket queues.

Textellent offers robust business texting services, including SMS, MMS, and customer service. Textellent's business SMS and text message marketing solutions simplify designing, managing, and measuring SMS and MMS campaigns. Textellent is a simple-to-use service that texts-enables local business lines, allowing you to text customers for marketing, customer service, and sales from a number they already recognize. You can use Textellent to schedule and manage appointments, including booking, confirmations, reminders, and follow-ups. Keywords and shortcodes are also available for easy opt-in programs that comply with the TCPA, supported by AI. Textellent Messenger, a free extension for Google Chrome, supports Business Texting from any web page or web application.

Boost your sales and enhance customer satisfaction by implementing advanced SMS campaigns, instant one-time passwords (OTPs), notifications, interactive messaging, and a range of award-winning bulk SMS solutions. Seamlessly customize your bulk SMS by incorporating recipient names or personalized fields, create messages in over 20 languages, schedule your dispatches, and include opt-out options among other features. Enjoy top-tier SMS delivery that guarantees reliability. Automate both the sending and receiving of SMS through any website, CRM system, or application. Take advantage of SMS APIs that come with sample code available in more than 10 programming languages, such as PHP, Java, and .NET. Effortlessly embed images, videos, PDFs, spreadsheets, and additional content as shortlinks within your bulk SMS campaigns to capture your audience's interest. Effectively communicate your message within 160 characters. Allow your customers to connect with you instantly by texting your long codes and keywords, enabling auto-replies or transitioning conversations to other platforms. Additionally, assess the outreach and impact of your campaigns using real-time SMS delivery analytics, along with detailed click metrics for all web links and attachments sent as Textlocal short links, ensuring you have comprehensive insights into your messaging effectiveness. This multifaceted approach not only keeps your customers engaged but also enhances their overall experience.