Tresta vs String
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Tresta
This business phone system offers unlimited calling and texting on a dedicated business number, accessible from your smartphone. It provides essential collaboration features to enhance your company's professional image and communication capabilities.
- Unlimited calling
- Unlimited texting
- Business phone number
- Collaboration features
- Mobile accessibility
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Tresta is a business phone system that’s as mobile as you are, with all the calling, texting and collaboration features you need to help your business look its best. Install Tresta on your smartphone today and begin taking advantage of unlimited calling and texting on your business phone number - from anywhere. Note: The Tresta app uses call bridging to facilitate outbound calls. This requires voice and data to access with your iPhone service provider.
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 review sentiment: String at 69% against Tresta's 17%. String also leads on ratings volume (62 vs 12) and device support (3 vs 1). Tresta's advantage is rating (4.7 vs 3.5) and monetization model (free vs free with in-app purchases). On price, update cadence, ads and in-app purchases 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.
Tresta holds the better App Store score, 4.7 against 3.5. That said, the two scores are not equally well evidenced: String has 62 ratings behind it against 12, so its average is the more settled of the two. Written reviews complicate that: 17% of Tresta's written reviews are positive against 69% of String's, so the app with the better star average is not the one people write more warmly about.
Tresta ships an update every 4 weeks, String every 2 months. Both last shipped on October 24, 2026.
| Parameter | Tresta | String |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (12 ratings) — better | 3.5 (62 ratings) |
| Positive reviews | 17.0% of reviews | 68.6% of reviews — better |
| Number of ratings | 12 | 62 — better |
| Update frequency | Every 4 weeks — better | Every 2 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone | iPhone, iPad, iPod — better |
| Requires iOS | 16.0 | 15.0 — better |
| Further details — not scored | ||
| Size | 38 MB | 68 MB |
| Age rating | 4+ | 4+ |
| Developer | Tresta | NumberBarn, LLC |
Customer experience
Tresta
String
Bugs and requests
Tresta
Reported bugs
57 issues- Text messages no longer show up
- Error message pops up 50% of the time
- Can't make calls until force quit
- Phone locks/shuts off when listening to recordings
- Buggy and often non-responsive iPhone app
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- New update = can't make calls
- Spinning wheel of eternity when calling
- App glitching
- No notifications for text messages
- App directs to website for many options
- No login option on mobile app
- Website doesn't show text conversations
- App won't load texts
- Intermittently does not alert to new messages
- App crashes/closes immediately on iOS
- App doesn't allow picking up calls
- Automatically hangs up calls
- Message app deletes itself, won't send, or sends multiple times
- Caller ID works half the time
- Can't listen to voicemails
- Rings once, no opportunity to answer
- Only allows access to quarter of contact list
- Deletes input when looking elsewhere
- Won't connect calls
- Doesn't send login code
- App constantly freezes
- MMS no longer possible
- Audio gets cut off when phone locks during recordings
- Slow app tends to lag and not display messages at real time correctly
- Call quality dropped badly
- Noticeable delay between speaking and being heard
- Constant delay and echo
- Search shows no results
- Doesn't show contact names
- Notifications don't show
- Text messages not being sent/received
- Calls not connecting to the app
- Call drops
- Lost business due to bugs
- Inconsistent and buggy
- Problems never fixed, got worse
- App having issues, engineers working on it
- Sloppy UI, easy to push wrong buttons
- Bug after bug, can't get code together
- Price went up, features stopped working
- Service feels like perpetual beta
- App is slow and a pain to use
- Technology is from years ago
- Slow when working
- App loads forever
- Customer service and support MIA
- Horrendous customer support
- Chronically malfunctioning app
- Poor design
- Missing key features
- No call transfer
- Web app softphone and text messaging not available
Requested features
11 requests- Make it possible to have a contact list within the Tresta app
- Faster response time between multiple tabs
- Add dark mode option
- Improve UI to look more like a phone service
- Ability to block harassment numbers
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- Add call transfer functionality
- Web app softphone and text messaging over browser
- Fix audio cut off when phone locks during recordings
- Make it possible to cancel membership online
- Add login option to mobile app
- Allow users to see who each number belongs to
String
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Tresta
No in-app purchases
String
No in-app purchases
