String
String is a cloud-based SMS marketing and business texting platform serving small businesses across 10 verticals including retail, restaurants, real estate, hospitality, nonprofits, fitness and eCommerce, offering subscription plans with keyword autoresponders, mass messaging and text-to-landline capabilities.
- Company typePrivate
- Founded2016
- HeadquartersSan Francisco, United States
- Headcount1–10
- GTM typeB2B
- OfferingSoftware
What String does
String is a cloud-based SMS marketing and business texting platform serving small and mid-sized businesses across multiple verticals including retail, restaurants, real estate, hospitality, nonprofits, churches, sports teams, fitness, eCommerce, and general small business services. Founded around 2016 and headquartered in San Francisco, California, the company operates as a subsidiary of ClearHello, a multi-brand communications holding company that also owns NumberBarn, NumberGarage, TierraNet, DomainSpot, and ClearHello. The Terms of Service specify California governance and San Francisco County as venue for disputes, and the company serves a primarily U.S. customer base.
The String platform combines text messaging, voice calling, and automation tools delivered through web and native mobile applications for iOS and Android. Its core technology supports standard business texting plus a differentiated text-to-landline capability that enables SMS on existing landline phone numbers without modifying voice service. The platform offers 20+ features including keyword autoresponders, voicemail transcription, drip campaigns, contact segmentation, mass texting, multiple phone numbers per account, WiFi calling, and personalization fields. It integrates natively with 60+ third-party applications and extends to 1,000+ via Zapier, spanning CRM (Salesforce, HubSpot, Zoho, Pipedrive), eCommerce (Shopify, eBay, WooCommerce, BigCommerce), marketing automation (Mailchimp, Drip, ConvertKit, Infusionsoft), payments (Square, Stripe), and productivity tools (Slack, Google Workspace, Trello, ClickUp).
String monetizes through two monthly subscription tiers — Essential at $19.99/month (unlimited texting and calling with basic tools) and Elite at $26.99/month (adding mass messaging, keyword responses, custom audiences, and integrations) — supplemented by usage-based mass message credit packs priced $4.99 to $34.99 and per-unit overage fees. Distribution is primarily product-led through self-serve signup at app.string.ai/signup, with an inside sales contact path for larger teams. The company has historically targeted the SMB and prosumer market, with no disclosed named customer logos, and reports headcount of 1–10 employees.
String firmographics
Firmographics- Name
- String
- Legal name
- String
- Website
- https://joinstring.com
- Company type
- Private
- Founded year
- 2016
- Operating status
- Operating
- Headcount range
- 1–10 employees
- Short description
- String is a cloud-based SMS marketing and business texting platform serving small businesses across 10 verticals including retail, restaurants, real estate, hospitality, nonprofits, fitness and eCommerce, offering subscription plans with keyword autoresponders, mass messaging and text-to-landline capabilities.
- Ownership category
- akta.pro rank
String industry classification
Industry- Product category
- Business Messaging Software
- NAICS
- Telecommunications (517), All Other Telecommunications (517810)
- SIC
- Communications Services, Nec (4899), Telegraph & Other Message Communications (4822)
- akta.pro primary industry
- SMS/MMS & Messaging Marketing Services (Text, RCS, WhatsApp/OTT) (MPAAAIAB)
- akta.pro secondary industry
- SMS/RCS Messaging Platforms (BPAMACAF)
Keywords
Where String is headquartered
LocationHeadquarters
- HQ city
- San Francisco
- HQ country
- United States
- HQ region
- North America
Offices1 record
Markets served
String business model
Business model- GTM type
- B2B
- Offering type
- Software
- Cost components
- Technology or R&D, Infrastructure, Personnel, Marketing or Sales, Operations
Revenue model
- Subscription Plans: Monthly subscription revenue from two tiers: Essential ($19.99/mo) includes unlimited texting, calling, and basic productivity tools; Elite ($26.99/mo) adds mass messaging, keyword responses, custom audiences, and business integrations
- Mass Message Credits: Optional credit packs for mass SMS messaging beyond plan limits. 50 credits for $4.99, 200 credits for $9.99, 1000 credits for $34.99. Messages consume 1 credit each
- Overage Charges: Additional charges for usage exceeding fair use thresholds. 0.03 cents/minute for calling overages, $0.015 cents/text message for messaging overages
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Subscription | Monthly | Essential plan - unlimited texting and calling with basic tools |
| Subscription | Monthly | Elite plan - full-featured SMS marketing with mass messaging and automations |
| Unit Pricing | Pay-as-you-go | Mass Message Credit Packs - optional add-on for bulk SMS |
Go-to-market motion3 records
Distribution channels5 records
Marketing channels6 records
String product offering
Product offeringCore offering
String provides a cloud-based business texting and voice platform that enables SMS marketing, mass messaging, one-to-one conversations, voicemail transcription, call forwarding, and keyword-driven automation. It includes text-to-landline capability allowing businesses to send and receive texts from existing landline numbers without changing voice service. Customers access the platform via web or native iOS/Android apps, with contact segmentation, drip campaigns, and integrations to 1000+ third-party apps.
Product overview
String is a unified cloud-based SMS marketing and business communications platform that combines text messaging, voice calling, and automation tools. The core String Platform offers essential features including unlimited texting, calling, contact management, and keyword autoresponders, which are available through two pricing tiers: Essential Plan ($19.99/month) for basic features and Elite Plan ($26.99/month) adding mass messaging, keyword responses, custom audiences, and business integrations. Additional offerings include optional Mass Message Credits for volume SMS sending, Number Transfer Service for porting existing numbers, and Text-to-Landline for enabling SMS on landline phones. Sub-products include Voicemail Transcription, Drip Campaigns, Contact Segmentation with personalization fields, Message Templates, WiFi Calling, and native Mobile Apps for iOS and Android. The platform integrates with 60+ third-party applications including CRM, e-commerce, marketing automation, and accounting tools. String is developed by ClearHello, headquartered in San Francisco, California.
Differentiator
Problem solved
Functional benefit
Products and services
- String Platform Cloud-based business texting and voice solution offering SMS marketing, mass texting, one-to-one messaging, call forwarding, voicemail transcription, keyword autoresponders, drip campaigns, contact segmentation, and integrations with 1000+ apps, accessible via desktop web and native iOS/Android mobile applications. Targeted at small and mid-sized businesses across retail, restaurants, real estate, hospitality, fitness, nonprofits, churches, sports teams, eCommerce, and general small business verticals.
Quantifiable outcome
- 98% SMS open rate vs 20-30% average email open rate
- +4 more outcomes
Companies that use String
Customer profileSegments10 records
Ideal customer profiles3 records
String technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Integration80 records
Feature10 records
String partnerships and signals
Strategic signalPartnerships
Eleven partnerships are on record, tiered core.
- ZapiercoreZapier integration enables users to connect String with thousands of apps and platforms, creating automated workflows (zaps) between String and CRM systems, email platforms, project management tools, and more
- SalesforcecoreNative integration with Salesforce CRM for syncing contacts and enabling workflow automation between SMS communications and Salesforce records
- ShopifycoreNative integration with Shopify eCommerce platform for connecting SMS marketing with online store customer data and order management
- MailchimpcoreNative integration with Mailchimp email marketing platform for cross-channel marketing automation and contact synchronization
- SlackcoreNative integration with Slack for receiving real-time notifications about String messages in Slack channels, enabling team collaboration
- HubSpotcoreNative integration with HubSpot CRM for syncing contacts and automating workflows between SMS marketing and HubSpot marketing/sales tools
- SquarecoreNative integration with Square payment and POS platform for connecting SMS marketing with in-person sales and customer transactions
- QuickBookscoreNative integration with QuickBooks accounting software for syncing business data and customer information with SMS marketing workflows
- InstagramcoreNative integration with Instagram for social media connectivity and marketing campaign coordination across platforms
- eBaycoreNative integration with eBay marketplace for connecting SMS communications with e-commerce listings and customer transactions
- ClearHellocoreParent company - ClearHello is the parent organization of String and related communication brands including NumberBarn, NumberGarage, TierraNet, DomainSpot, and ClearHello
Scale indicators7 records
Recent moves6 records
Expansion highlights5 records
String competitors and assessment
Company assessmentDirect peers
- SimpleTexting: Direct competitor in the SMB SMS marketing space with tiered subscriptions, mass texting, keyword autoresponders, and 1:1 conversations — overlapping on nearly every headline feature String offers.
- EZ Texting: Direct competitor focused on SMB mass texting, keywords, MMS campaigns and contacts — overlapping on core product, pricing position and target buyer.
- SlickText: Direct competitor targeting small and mid-sized businesses with mass SMS, automation, list growth and CRM integrations in a similar price/feature band.
- Textedly: Direct competitor offering SMS marketing, mass texting, drip campaigns and keyword automation for SMBs across retail, real estate, fitness and similar verticals.
- TextMagic: Direct competitor providing business text messaging, bulk SMS, two-way conversations and SMS API — overlapping on both marketing and transactional messaging use cases.
- Postscript: SMS marketing platform tightly focused on Shopify eCommerce with automations, segmentation and keyword flows — comparable functionality for the eCommerce vertical String targets.
- Attentive: Higher-end direct competitor in SMS marketing specializing in eCommerce; competes on segmentation, AI and analytics for the same retailer/eCommerce buyer String targets with Elite tier.
Broad incumbents
- Klaviyo: Established email + SMS + reviews platform for eCommerce; overlapping on SMS marketing but offers a much broader owned-marketing stack than String's narrow SMS/voice focus.
- Twilio: Foundational CPaaS underlying much of the SMS ecosystem; overlaps broadly on programmable SMS and voice but is a developer/infrastructure layer rather than a marketing-focused UI like String.
- AWeber: Established email-marketing platform that has expanded into SMS; serves the same SMB marketing buyer with a cross-channel mix overlapping String's positioning.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat4 records
Key risks5 records
Key highlights6 records
Customer concentration
String social profiles
Digital presenceString financial estimates
Financial estimateRevenue estimate
Valuation estimate
String leadership team
Management profileNumber of profiles
String funding detail
Funding detailFunding overview
Funding rounds1 record
Investors2 records
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
String M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about String
What does String do?
String provides a cloud-based business texting and voice platform that enables SMS marketing, mass messaging, one-to-one conversations, voicemail transcription, call forwarding, and keyword-driven automation. It includes text-to-landline capability allowing businesses to send and receive texts from existing landline numbers without changing voice service. Customers access the platform via web or native iOS/Android apps, with contact segmentation, drip campaigns, and integrations to 1000+ third-party apps.
Is String a public or private company?
String is a private company. It is classified as corporate owned and is currently operating.
When was String founded?
String was founded in 2016. It employs 1 to 10 people.
Where is String based?
String is headquartered in San Francisco, United States, in the North America region.
How does String make money?
Three revenue lines are on record. Subscription Plans are the primary driver. The others are mass Message Credits and overage Charges.
Who are String's main competitors?
Direct peers on record are SimpleTexting, EZ Texting, SlickText, Textedly, TextMagic, Postscript and Attentive. Broad incumbents are Klaviyo, Twilio and AWeber.
Does String have an API?
No public API is recorded for String.
What industry is String in?
String's product category is Business Messaging Software. Its primary akta.pro industry code is MPAAAIAB, SMS/MMS & Messaging Marketing Services (Text, RCS, WhatsApp/OTT), with a secondary code of BPAMACAF, SMS/RCS Messaging Platforms. Its NAICS code is 517 and its SIC code is 4899.