String is a business communication app for iOS and Android that enables SMS and voice capabilities on existing landlines for small business owners.
Product velocity
Active
Daily rank 🇺🇸
—
Business
Sentiment
3.5
90 reviews
Nemesis
Quo (formerly OpenPhone)
The App DNA
What makes this app unique?
Users hire String to professionalize their business communication without the complexity of enterprise telephony, allowing them to separate work and personal threads.
For Small business owners and professionals who need to modernize landline or mobile communication for marketing and customer support.
What does it look like?
Key features
Adds SMS and MMS capabilities to existing landline phone numbers without modifying voice service
Transforms message threads into a kanban-style board with filtering, tagging, and status management
Triggers auto-replies and keyword-based responses for lead capture and customer support
How much does it cost?
Monetization relies on the sale of premium phone numbers and business-grade communication features.
Velocity
Active developmentShow more...
5 versions in history. Development pace: active.
Who built it?
User Sentiment
What do users think recently?
How are ratings & reviews evolving?
Not enough recent reviews to extract reliable themes yet.
Read the full review analysisCompetition
Competitive landscape for String — Modern Phone Inbox
How's the Business market?
String occupies the solo-professional business communication niche, currently maintaining a 3.5-star rating across both iOS and Android platforms. The lack of team-collaboration features positions it as a lightweight alternative to enterprise-grade platforms like Dialpad.
Read the market outlookThe rivals identified
By OpenPhone Technologies Inc
Dominates the modern business communication space with a high-velocity release cycle and deep feature set that directly mirrors String's value proposition.
- Offers robust shared inbox functionality for teams that goes beyond basic tagging and filtering
- Provides deep CRM integrations that allow for automated contact syncing and activity logging
- Maintains a high-velocity release cadence with 11 updates in six months, signaling rapid iteration
Unlock the head-to-head verdict: where this rival wins, and where it loses.
Access the full report for freeThe Analyst's Read
Key takeaways for String — Modern Phone Inbox
Where is it heading?
The business communication market is consolidating around team-collaboration and CRM-integrated workflows, leaving standalone messaging apps like String exposed to enterprise-ready rivals. String must transition from a solo-user utility to a team-based platform to avoid being squeezed out by competitors that offer more mature integration ecosystems.
- The rapid release cadence of competitors like Quo accelerates churn pressure on String's solo-user base, forcing a pivot to team-based features to remain relevant.
- Recent updates focused on stability and media rendering, signaling a maintenance-heavy posture rather than active feature expansion for the current quarter.
The SWOT
- Landline text-enablement creates high switching costs for legacy businesses
- Kanban-style inbox organization reduces operational friction for solo users
- Untapped B2B partnerships with local service providers
- Expansion of CRM integration depth to compete with enterprise-grade platforms
Next best moves
Ship native team-collaboration features because Quo’s shared inbox functionality is the top churn risk → retain scaling business users.
+ 1 more prioritized moveThe counter-intuitive read
String’s reliance on solo-user workflows is not a weakness but a moat…
Read the full takeFeature gaps
Shared team inboxes (available in Quo but absent here) +2
Since the last report: String has refined its market positioning to focus on solo-professional workflows while acknowledging significant competitive pressure from team-oriented rivals.
Bottom line
String maintains a strong solo-user niche through landline enablement, but its lack of team-collaboration features leaves it exposed to faster-moving rivals like Quo, so the PM must prioritize team-based functionality to prevent churn among scaling businesses.
Unlock 2 critical frictions, 2 market threats, 1 more prioritized move and the analyst’s take.
Access the full report for freeReport last updated