Unity vs String
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Unity
This business communication app extends call control, visual voicemail, and instant messaging to your mobile device. It offers a unified "one number" solution, masking your cellular number for professional calls. Manage your VoIP environment, check user availability, and communicate with colleagues seamlessly.
- Call control (hold, transfer, conference, record)
- Visual voicemail
- Directory integration
- Busy Lamp Field status
- Instant messaging and presence
- Service configuration
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Unity Mobile extends the call control, visual voicemail, service configuration, Busy Lamp Field, directory integration and IM&P capabilities of Unity Client to the mobile phone, allowing you to take your business identity with you. The underlying cellular number is completely masked when both making and receiving calls, providing a total “one number” solution. Unity leverages BroadWorks Anywhere functionality with the native dialler on the mobile device, greatly enhancing reliability and simplifying support for service providers. Supported Features: • Call Control: Hold, transfer, conference, call recording. Both for inbound and outbound calls • Visual Voicemail: Download, play, delete and view all voicemails • Contacts: Lookup group/enterprise and personal contacts from BroadWorks, as well as contacts stored on the mobile device. • Busy Lamp Field: See the phone status of any user in your group or enterprise • Send SMS and Emails: Use the native apps to send SMS messages and Emails to contacts with a mobile number or email address in their profile • Instant Messaging: IM any other Unity user in the group or enterprise, or set your presence status for others to see. • Service Configuration: Control your VoIP environment directly from Unity Mobile. From activating Do Not Disturb to managing your call center availability and visual voicemail to creating conference calls. • Dark mode supported
String
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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Boost your brand engagement with String’s intuitive business SMS marketing, text and voice. ANY PHONE NUMBER, EVEN LANDLINES Use your existing mobile or landline number with String. Select a new local number or upgrade to a vanity or toll free number of your choice. ORGANIZE YOUR INBOX Transform your inbox into a sales funnel or kanban board with various viewing, filtering and tagging options — Stay on top of your conversations and never miss a message again. POWERFUL MESSAGE MANAGEMENT Mark Unread and Archive — You love it for your emails, you’ll love it for your texts. STAY RESPONSIVE, 24/7 Amplify your interaction with automations and Auto-Replies — Respond to texts and missed calls on time, every time. TAP INTO ENDLESS POSSIBILITIES Contact Management & Integrations — Save important contact notes directly from the message thread. Capture contacts, import from your phone or computer,, automate workflows, integrate with tools you love (like your CRM, etc). REACH THE MASSES, OR JUST ONE Conversational, Groups or Mass Messaging — Respond directly with 1-1 messaging, message with a group,r or send personalized Mass Messages to multiple people at once, individually. BUILD A LOYAL CUSTOMER BASE Send promos, reminders and confirmations and never miss a lead, client or customer with Elite features like triggered Keyword Responses, and Auto-Replies. SAVE TIME Templates — No more copy-pasting the same message over and over. No time to listen to voicemail? View voicemail transcriptions in your inbox with visual voicemail. USE IT ANYWHERE Browser & Mobile Apps — Increase your workflow efficiency with access to String from your computer and mobile device. CALL FORWARDING & VOICE Separate your personal and professional calls with call forwarding and flexible voice settings. GOT QUESTIONS? Email our stellar support at support@joinstring.com. Find helpful articles, join our customer community and create tickets in our Help Center: https://help.joinstring.com/hc/en-us Terms of Service: https://www.joinstring.com/terms Privacy Policy: https://www.joinstring.com/privacy
Screenshots
Verdict
The clearest difference is rating: Unity at 5.0 against String's 3.5. Unity also leads on monetization model (free vs free with in-app purchases) and iOS requirement (12.0 vs 15.0). String's advantage is ratings volume (62 vs 2) and update cadence (every 2 months vs every 3 months). On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Unity holds the better App Store score, 5.0 against 3.5. That said, the two scores are not equally well evidenced: String has 62 ratings behind it against 2, so its average is the more settled of the two.
Unity ships an update every 3 months, String every 2 months. The most recent releases landed on September 10, 2026 and October 5, 2026 respectively.
| Parameter | Unity | String |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) — better | 3.5 (62 ratings) |
| Positive reviews | — | 68.6% of reviews |
| Number of ratings | 2 | 62 — better |
| Update frequency | Every 3 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 12.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 17 MB | 68 MB |
| Age rating | 17+ | 4+ |
| Developer | Kakapo Systems Ltd | NumberBarn, LLC |
Customer experience
Unity
String
In-app purchases
Unity
No in-app purchases
String
No in-app purchases









