String — Modern Phone Inbox

String — Modern Phone Inbox

Superpowered texting & calling

62 ratings
35 reviews
Free

Details

  • Released
  • Updated
  • April 12, 2019
  • July 16, 2026

Features

String — Modern Phone Inbox screenshot #1 for iPhone
String — Modern Phone Inbox screenshot #2 for iPhone
String — Modern Phone Inbox screenshot #3 for iPhone
String — Modern Phone Inbox screenshot #4 for iPhone
String — Modern Phone Inbox screenshot #5 for iPhone
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About

Enhance customer engagement with a business SMS and voice platform. Organize your inbox, automate responses, and manage contacts efficiently. Send personalized messages to individuals or groups, and access your workflow from any device.

Use existing or new phone numbers
Organize inbox with sales funnel view
Automated responses and auto-replies
Contact management and CRM integrations
1-1, group, and mass messaging
Templates and voicemail transcription
Browser and mobile app access
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What's New in String

3.1.27

July 16, 2026

Added offline mode support Introduced number blocking Smoother in-call experience and handling Enhanced audio routing and Android channel management General bug fixes and performance improvements

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User reviews

Do not even try it

I wish I did my research before switching my business line to string. The calls would drop within 3-10seconds and then I would not be able to call back. Then my line cut out completely and sent people straight to voicemail.

I lost so much business. Their customer support is non-existent. You cannot get anyone on the phone and have to wait days for email replies that are generic.

I finally got my line changed to Ring Central and they are amazing! Highly recommend.
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Don’t waste your time or money

I’ve used String now for 4 years, Nov 2020 to be exact, and when I tell you this app does not get better - even that’s a case understatement.

I was worried, but later had high hopes when they were bought out by Number Barn, yet they seem to have forgotten about the app too. I’ve also been in contact with their support team to try and resolve issues. They’re fixed for a few weeks, but then the issues come right back.

• Most times the website loads to a white screen, I’m lucky to even get in
• App loads message threads out or order
• tapping into a thread does not load any part of the conversation
• sending a message in the thread works, but you wouldn’t know because, well, the thread doesn’t load
• Tapping a thread with a contact you thought you were going to loads an entirely different number/contact at the top, still with no content

At this point, I’m only using it for notifications that messages came in so I can then go spam reload / clear cache on my computer until the page loads so I can respond to clients.
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Service works, mobile app is incredibly buggy and bad.

Started off promising, then they got bought by Number Barn and seem to be the forgotten service. App has been incredibly buggy with every update, often push notification badges don’t clear, text threads are slow to update and sometimes show off screen, and a number of other weird usability flaws requiring you to end the app and reopen to hope it fixes.

Use the website primarily and this app as a backup and you’ll be okay.

It could be MUCH better if it was just stable.
iPhones used on: X, 12 Pro Max, 14 Pro Max
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New user experience

It’s doesn’t have where to sign up on the app

Lost my number, no one to talk to

Had to uninstall and reinstall the app, now I can’t access my account, and there is no one to message or call.

Worst idea ever.

Developer apps

FAQ

What does this app do?

This app is a business SMS and voice platform designed to enhance customer engagement. It allows you to use your existing phone number or get a new one for business communications, organize your inbox, and automate responses to messages and missed calls.

What are the key features of this app?

Key features include the ability to use any phone number, an organized inbox with sales funnel views, powerful message management, automated responses, contact management with CRM integrations, and options for 1-1, group, or mass messaging. It also offers templates and voicemail transcription.

How is this app monetized?

The app is free to download and use, with in-app purchases available for additional features and services. Specific pricing details for upgrades and premium features can be found within the app or on their website.

What devices is this app compatible with?

This app is accessible from both your computer via a browser and on your mobile device through dedicated mobile apps. This allows for increased workflow efficiency and the ability to manage communications from anywhere.

What are common use cases for this app?

Common use cases include sending promotional messages, appointment reminders, and order confirmations to customers. It's also useful for lead generation, managing customer inquiries, and providing customer support through text and voice channels.