Best SMS API Providers for Slack
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Compare the Top SMS API Providers that integrate with Slack as of September 2026
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This a list of SMS API providers that integrate with Slack. Use the filters on the left to add additional filters for products that have integrations with Slack. View the products that work with Slack in the table below.
What are SMS API Providers for Slack?
SMS API providers, also known as SMS gateway providers, offer technology that enables software applications to send, receive, and track Short Message Service (SMS) messages over an internet protocol. They provide a way for businesses to communicate with customers in real-time via text as an integrated part of their overall communication strategy. These services are often cost-effective and easy to integrate into existing systems. Additionally, providers typically offer support in the form of user guides and documentation. Compare and read user reviews of the best SMS API providers for Slack currently available using the table below. This list is updated regularly.
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1
Notifyre
Notifyre
Notifyre's SMS API is a REST API for sending, scheduling, and receiving text messages from your own software. It includes official .NET and Node.js SDKs, quickstart documentation, token authentication per environment, and real-time webhooks with HMAC signature verification for delivery status and inbound SMS and MMS. Endpoints cover sending and scheduling messages, tracking delivery, managing numbers and sender IDs, and bulk importing contacts. Pricing is pay as you go at 2 cents per SMS with carrier fees included, free inbound replies, no platform fees, and wallet funds that never expire. Notifyre handles US carrier (10DLC) registration with hands-on guidance so API traffic stays deliverable. Infrastructure runs at 99.99% uptime, ISO 27001 certified and HIPAA compliant with AES 256-bit encryption. Rated 4.7/5 from 1,187 reviews. Unlike bigger SMS APIs, support comes from a local U.S. team on live chat and phone, with a responsive account manager, not ticket queues.Starting Price: 2¢/SMS part; 3¢/fax page (USD) -
2
800.com
800.com
800.com is a business phone and call tracking platform that helps small and growing businesses understand, manage, and respond to inbound calls more effectively. The platform provides local and toll-free numbers, call tracking, call recording, voicemail, SMS, and detailed call reporting so teams can see where calls come from and how they’re handled. Businesses use 800.com to track phone leads across websites, ads, social media, and offline marketing, improve response times, and follow up on missed calls. With integrations for Google Ads, GA4, Meta, Microsoft Ads, and popular CRMs, 800.com connects call data to marketing and sales workflows. The platform is easy to set up, flexible as businesses grow, and designed to turn phone calls into clearer insights and better customer experiences.Starting Price: $19 per month -
3
ClickSend
ClickSend
ClickSend is a simple, global SMS platform built for developers and the businesses they support. Built on a battle-tested API that always delivers with: - Billions of messages delivered globally - Direct routes only to 190+ countries - 99.95%+ uptime - Lightning-fast delivery - Pay-as-you-go pricing — no lock-ins - 24/7 support from people who actually understand APIs - It works straight out of the box — and keeps working as you scale. Already use Zapier, ActiveCampaign, Make or Power Automate? There are pre-built integrations ready to go. Sign up and send your first message in minutes with free test credits. Perfect for: alerts, 2FA codes, marketing campaigns and transactional messaging.Starting Price: $20 minimum topup -
4
Twilio
Twilio
Design and deploy your ideal customer engagement experience. Twilio is a single fully-programmable platform with flexible APIs for any channel and over 400+ integrations, backed by a community of over 9 million developers. Build accurate and personalized experiences for your customers, easily and at scale, using SMS and WhatsApp messaging, voice, video, email, and more. Browse documentation and SDKs in multiple coding languages, including Ruby, Python, PHP, Node.js, java, and C#, or jumpstart your first project with our open source code templates to quickly build production-ready communications apps. Sign up and start building today.Starting Price: $0.0085 per min -
5
Textlocal
Textlocal
Increase sales and customer satisfaction with smarter SMS campaigns, instant OTPs, notifications, two-way interactions, and other award-winning bulk SMS services. Effortlessly personalize your bulk SMS with names or custom fields, compose in 20+ languages, schedule/stagger your sends, add opt-out path and more. Get best-in-class SMS delivery. Automate sending and receiving SMS from any website, CRM, or application. Access SMS APIs with sample codes in 10+ languages including PHP, Java, .NET & more. Easily insert images, videos, PDFs, spreadsheets & more as shortlinks in your bulk SMS campaigns and grab your customers’ attention. Convey more in 160 characters. Let your customers instantly reach you by just texting into your long codes and keywords. Set auto-replies or take the conversation forward on other channels. Measure campaign outreach and effectiveness with real-time SMS delivery reports, and granular click metrics for all weblinks and attachments sent as Textlocal short links.Starting Price: $3.88 per month -
6
Chert
Chert
Chert is iMessage infrastructure for reaching people at scale, providing the API and workflow layer for sending, receiving, routing, and observing real iMessage conversations. It lets teams build and deploy AI on iMessage while maintaining quality, trust, and personalized interaction, with blue-bubble threads from verified numbers delivered like native iMessage. Typing indicators, reactions, reply context, read receipts, and attachments stay intact for AI or human follow-up, while multi-recipient threads support named senders and clean handoffs. If a recipient is not on iMessage, conversations can fall back to SMS or RCS, with delivery status surfaced per message. Workflow primitives include phone number pools, reply routing, webhooks, and audit trails, and the same API can start a thread, interpret a reply, and move the workflow forward.Starting Price: Free -
7
Project Blue
Project Blue
Project Blue is an iMessage and SMS marketing platform that turns an existing CRM into a direct business messaging channel without requiring users to send from a personal phone. It provides dedicated messaging lines and connects with CRMs such as HighLevel, Close, and HubSpot, allowing sales teams to send iMessages directly from their normal workflows. If iMessage is unavailable, intelligent detection automatically falls back to SMS, while RCS support enables rich messaging with high-definition video, images, and voice notes across compatible devices. It also includes a business dialer built into the CRM for inbound and outbound calls, with automatic call logging, searchable transcripts, CRM sync, and AI-generated call outcomes. Messaging features include standard and AI-generated voice memos, voice cloning, HD media, Bitmoji cards, and support for marketing-specific numbers. Real-time analytics track response rates, message volume, delivery performance, and other KPIs.Starting Price: $250 one-time payment -
8
Tall Bob
Tall Bob
Tall Bob is a mobile messaging/engagement platform focused on SMS, MMS, RCS, WhatsApp Business, and mobile landing pages, designed to maximise interaction, conversions, and insights. It offers a suite of products; SMS and MMS messaging; a web-portal for SMS, SMS and MMS gateway APIs; and mobile landing pages to build media-rich, interactive customer journeys. Tall Bob emphasises rich content and engagement tools, including video content, surveys, gamification, augmented reality, and catalogues, to make messages more compelling. It provides real-time analytics, dashboards, and reporting to show the performance of campaigns, detailed journey behaviour per recipient, enabling marketers to see which messages, content, and paths are working, and to segment, export, or feed data into third-party systems. The infrastructure promises reliable delivery, strong uptime, and robust local support, including account management and technical team assistance. -
9
Apidaze
Apidaze
Add real-time voice, video, messaging, and more into your VoIP, web, and mobile services. No CapEx. No contracts. Pay as you grow. 100% freedom to build what you want. Handle inbound or outbound calling seamlessly with Apidaze’s Voice APIs. There is no need for complex phone systems, or commitments with large carriers. Apidaze gives you access to phone numbers in more than 8,000 cities in 60 different countries. Create simple IVRs without the need for a phone system. Play a welcome message to the caller and route the call to different people depending on the caller’s input. With 6,000,000,000 SMS being sent each day in the US, SMS has quickly become an important communication medium to keep in touch with your customers. -
10
Creating Customer Journeys Through Conversations. Engaging experiences that move with your customers. Loved by developers. Built for business. Vonage Communications APIs (formerly Nexmo) helps growing startups and agile enterprises enhance their customer experience and realize new business outcomes at scale. With our easy-to-use APIs, global platform, and expert support, you can abstract the complexity of communications and innovate faster. Reimagine voice interactions to redefine your customer experiences. Make each message count as an opportunity for your customers and your business. Enhance security and privacy—and create seamless login experiences. Build modern, high-quality voice applications in the cloud. Programmatically send and receive SMS in practically every country. Get real-time intelligence on any phone number in the world. Make and receive calls from the cloud with your existing VoIP infrastructure.
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