SMS marketing for nonprofits & charities 

Share urgent needs and opportunities over SMS

Quickly reach volunteers. String enables nonprofits of all kinds to increase their visibility and funding while educating and inspiring supporters.

  • Volunteers

    Rapidy deploy volunteers to assist immediate needs
  • Donors

    Keep supporters invested with action-oriented micro-content blasts
  • Staff

    Expedite staff response times with multiple user access across devices

Multiply your multitasking superpowers with String’s premium voice and text optimization, call forwarding, voicemail transcription and text-to-landline options, available directly from your desktop or mobile device.

Get Started Today

Improve your outreach & mobilize your mission

Modern communication & stakeholder engagement

98% open rates in SMS marketing make String’s SMS and voice solutions an essential for nonprofit leaders and teams. String’s automated text messaging provides ease-of-use, affordability, and power-packed versatility.

Empower your superhero staff with String’s dynamic customization possibilities. Segment lists to send SMS updates and needs to specific audiences. Faster engagement converts one-time visitors into committed supporters with autoresponders, personalized mass messaging or individual 1-to-1 texting.

View Features View Integrations

  • Automations

    Flexibility at your fingertips. Advance your organization’s mission with String’s extensive automations like built-in templates and keyword autoresponders. Segment subscribers with tags and lists to quickly communicate with donors and supporters, volunteers and staff, media and community partners.
  • 1-to-1 Texting & SMS Blasts

    Use 1-to-1 text messaging as a client, volunteer, and staff communication channel. Improve your volunteer coordination and information distribution. Send time-sensitive info in group, mass or individual messages. Keep your stakeholders engaged with event images, educational content and client or project success stories.
  • Contact List Management

    Don’t get lost in your inbox. Easily organize contact lists with tags and notes. Immediately find clients, volunteers, donors, staff and partner lists with search and filter features. Voicemail transcriptions enable faster follow-up.

SMS communications for nonprofit professionals


Increase your organizational visibility and build your support-base with proactive automated text messaging. Generate interest with special projects or informative campaigns including statistics and calls-to-action. Create “Text-to-Donate” keyword responders to automatically send a link to your donation platform.


Cultivate connection to your cause. Expand your outreach capacity with quick and efficient volunteer communications. Use segmented lists and mass messaging to swiftly deploy volunteers to help serve immediate needs. Improve your impact and reinforce your organizational reputation with active, invested and satisfied volunteers.


Multiple user access and additional phone numbers equip your staff to handle greater communication volume across devices, from one cloud-based String account. Use a number as a hotline, with wifi calling and voicemail. String’s multi-faceted  features like auto replies, keyword responders, text-to-landline and voicemail transcription ensure expedient follow-up with the people you serve.

Stay relevant to your client’s communications considerations. With over 20 robust features, String lets you superpower your conversations, scale up your responsiveness, and never miss a message again.

Professional SMS Solutions

Increase organization visibility

Generate interest

Personalize events and opportunities blasts

Create Text-to-Donate autoresponders

Use as a donor, volunteer, & staff communication channel

9 in 10 consumers prefer to text with their favorite businesses. Are your customer touchpoints built for a messaging-first, remote world?

View Plans & Pricing

Designed to automate your business messaging


Import, add, tag and note to organize & segment your contacts.


Mass Texting

Send mass messages to specific audiences at the same time.

Segment Tags

Tag contacts to segment and send targeted, relevant messages.


Keyword Responses

Create keyword campaigns to build lead lists, run promotions, etc.

Message Templates

Preformatted and personalizable text message templates.


Connect web apps you already use to your String account.

WiFi Calling

Place and receive calls over WiFi in app or on the web.

Multiple Numbers

Add multiple phone numbers, each with separate inboxes.

View All Features

Increase stakeholder retention and engagement

With SMS response rates averaging up to 8x’s higher than email responses, String’s text solutions provide advantages you can’t afford to miss.

Add keywords to banners, social media campaigns, websites and automated messages to create targeted announcements and event invitations. Never miss a client or donor with text-to-landline, call forwarding, voicemail transcription, built-in-templates and customized keyword responders.

Meet your organization's needs in real-time

  • Motivate donors & supporters

    Text exclusive events invites and opportunities for loyal supporters.
  • Personalize messages

    Personalization fields tailor texts to client’s first names.
  • Communications & dispatch

    Use as a dispatch tool to quickly deploy staff and volunteers to the field.
  • Auto-replies & away messages

    Automatic text replies and away messages allow you to respond instantly to your contacts 24 hours a day, 7 days a week.

Join String Today

Thousands of app integrations

Infinite opportunities. Integrate with thousands of platforms like Donately, Salesforce and Quickbooks to expedite your administrative, development and marketing flow. Connect to email, social media, and countless customer engagement tools directly from your String account.







Zoho CRM

Constant Contact

View All Integrations

Power-up your number or get a new one

  • Add superpowers to your existing phone number
    Transfer your existing phone number to String to begin using texting, calling, and direct messaging superpowers.
  • Get a new String phone number of your choice
    String includes a local phone number of your choice, along with millions of options for toll free, premium and vanity phone numbers for purchase.

Get String Today