Sinch vs. String Comparison


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About Sinch is a cloud communications platform that enables businesses to communicate with customers through SMS, MMS, RCS, WhatsApp, email, voice, and other digital channels. The platform provides communication APIs and ready-to-use applications for marketing campaigns, transactional notifications, customer support, and identity verification. Its messaging capabilities support personalized text campaigns, two-way conversations, automated reminders, and rich media interactions across global mobile networks. Sinch also offers email delivery services, programmable voice calling, phone number management, and authentication tools for securing customer accounts. AI-powered capabilities include conversational chatbots, customer service automation, fraud prevention, and intelligent communication workflows. The platform integrates with business applications through REST APIs, SDKs, and prebuilt integrations while providing delivery analytics, communication management, and enterprise security.	About String is a web-based SaaS platform that modernizes business texting, voice calling, and direct messaging across industries. Accessible from desktop or mobile, it provides a unified interface for automated and conversational SMS campaigns, mass text messaging, and voice communications. Users can import contacts, apply tags for segmentation, and create personalized campaigns using preformatted message templates. Keyword responses enable opt-in lead generation and promotions, while integrations with Zapier, Salesforce, Mailchimp, Shopify, Slack, QuickBooks, and thousands of other apps automate workflows and sync data across systems. Wi-Fi calling and support for multiple numbers, existing landlines, or new local, toll-free, premium, or vanity numbers allow seamless voice and text messaging from one application. Built-in dashboards track open rates, response times, conversion metrics, and customer engagement trends, freeing teams to focus on strategy rather than manual processes.
Platforms Supported Windows Not Supported Mac Not Supported Linux Not Supported Cloud Supported On-Premises Not Supported iPhone Not Supported iPad Not Supported Android Not Supported Chromebook Not Supported	Platforms Supported Windows Not Supported Mac Supported Linux Not Supported Cloud Supported On-Premises Not Supported iPhone Supported iPad Supported Android Supported Chromebook Not Supported
Audience Enterprises, small and medium-sized businesses, software developers, SaaS companies, ecommerce businesses, marketing teams, customer support departments, financial institutions, healthcare providers, telecommunications companies, and IT teams seeking omnichannel messaging, SMS marketing, programmable communications APIs, email delivery, voice services, customer engagement automation, and identity verification	Audience Businesses interested in a solution to automate marketing, customer support, and lead generation
Support Phone Support Not Supported 24/7 Live Support Not Supported Online Supported	Support Phone Support Supported 24/7 Live Support Supported Online Supported
API Offers API Supported	API Offers API Not Supported
Screenshots and Videos View more images or videos	Screenshots and Videos View more images or videos
Pricing No information available. Free Version Not Supported Free Trial Supported	Pricing $19.99 per month Free Version Supported Free Trial Not Supported
Reviews/Ratings Overall 1.0 / 5 ease 1.5 / 5 features 2.5 / 5 design 1.0 / 5 support 1.0 / 5 Read all reviews	Reviews/Ratings Overall 0.0 / 5 ease 0.0 / 5 features 0.0 / 5 design 0.0 / 5 support 0.0 / 5 This software hasn't been reviewed yet. Be the first to provide a review: Review this Software
Pros & Cons from Real Users Pros It used to be a good service a few years ago - it was a CLX Communication brand in the past. After the acquisitions, it got only worse. They appeared to have all the functions I needed in their API but unfortunately, because of their horrendous support, we never got up and running with them. Cons They claim SMSes have been delivered and charge you even if the SMSes do not reach the destination—that is totally unacceptable. After some communication ping-pong, the service recommends resetting the headset! The problem persists for a few months now. As mentioned above, we never got "launched" with Sinch, and it was completely on them that we didn't.
Training Documentation Supported Webinars Not Supported Live Online Not Supported In Person Not Supported	Training Documentation Supported Webinars Not Supported Live Online Supported In Person Supported
Company Information Sinch Founded: 2008 Sweden www.sinch.com	Company Information String United States www.joinstring.com
Alternatives Twilio Messaging Twilio	Alternatives TextBox
Twilio Voice Twilio	Text My Main Number
CM.com	SummitText
Vonage Communications APIs (Nexmo) Vonage	Business Texting TextBetter
Plivo View All	Pony Express HQ View All
Categories Bulk SMS Supported Chat SDK & API Supported Cloud Communication Platform Supported Communication APIs Supported Communications Platform as a Service (CPaaS) Supported SMS Gateways Supported SMS Marketing Supported Voice Calling API & SDK Supported	Categories SMS Marketing Supported

Integrations Instagram Supported Action Network Not Supported Axis LMS Supported Bizzabo Not Supported Calendly Not Supported Campaign Monitor Not Supported Comarch Loyalty Marketing Platform Supported CompanyCam Not Supported Cvent Abstract Management Not Supported Facebook Ads Not Supported Jotform Not Supported Meta Ads Not Supported Model Context Protocol (MCP) Supported MyWiFi Networks Not Supported Process Street Not Supported QuickBooks Online Not Supported Salesforce Not Supported Terapeak Not Supported X (Twitter) Not Supported Zapier Not Supported Show More Integrations View All 33 Integrations	Integrations Instagram Supported Action Network Supported Axis LMS Not Supported Bizzabo Supported Calendly Supported Campaign Monitor Supported Comarch Loyalty Marketing Platform Not Supported CompanyCam Supported Cvent Abstract Management Supported Facebook Ads Supported Jotform Supported Meta Ads Supported Model Context Protocol (MCP) Not Supported MyWiFi Networks Supported Process Street Supported QuickBooks Online Supported Salesforce Supported Terapeak Supported X (Twitter) Supported Zapier Supported Show More Integrations View All 70 Integrations
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