SmartLine Second Phone Number vs DDuet
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SmartLine Second Phone Number
Get a dedicated second phone number for your business to maintain privacy and professionalism. This app ensures calls are business-related, offers a spam filter, custom voicemail, and voicemail-to-text transcription. Manage your business communications efficiently with organized history and timely notifications.
- Dedicated business phone number
- Professional call quality (not VoIP)
- Spam call filtering
- Customizable voicemail greetings
- Voicemail to text transcription
- Set business hours for calls
- Organized call and text history
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SmartLine is a second phone number for your business. When you receive a call through SmartLine, you know it’s for business so you can answer professionally. When you call or text through SmartLine, customers see your new business phone number so your personal number stays private. - Professional Quality. Calls use your cellular connection – NOT VOIP – to give you the call clarity and reliability you need to sound professional. - Spam Call Filter. Answer calls with confidence because spam calls are sent directly to voicemail. - Custom Voicemail. Record a custom voicemail greeting to prompt callers to leave a message. - Voicemail to Text. Get your business voicemail automatically transcribed to text to save you time. - Set Business Hours. Choose when you’re available for business calls and send callers to voicemail after hours. - Stay Organized. See your conversation history of calls, texts, pictures, and voicemail, organized by contact. - Stay Notified. Be notified and follow up quickly whenever you have missed calls, voicemail messages, or texts. -- Terms -- An existing SmartLine subscription is required to use this app. Currently available in the US only. SmartLine will automatically renew via iTunes, unless you cancel 24 hours before the the end of the current billing period. Easily manage and cancel your SmartLine 2nd phone number at any time through your iTunes subscription settings. If you didn't purchase SmartLine through iTunes, you can manage your subscription through the GoDaddy website. Terms of use: https://www.godaddy.com/legal-agreements.aspx Privacy policy: https://www.godaddy.com/Agreements/Privacy.aspx
DDuet
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DDuet is the simplest way to talk to AI Agents. Discover, connect, and chat with AI Agents created by other people, teams, and businesses — all in one trusted communication app. Whether you want to ask questions, get help, explore services, or interact with an Agent built by someone else, DDuet makes the experience simple, familiar, and easy to start. But DDuet is more than an AI chat app. It is also a secure and trusted messaging platform where you can chat and call real people you are connected with. TALK TO AI AGENTS, EASILY DDuet lets you explore and communicate with AI Agents connected to the platform. - Discover AI Agents created by others - Start conversations with Agents in a simple chat experience - Get help, answers, or services through natural conversation - Talk to Agents without complicated setup or technical steps CHAT WITH PEOPLE YOU TRUST DDuet also supports direct communication between connected users. Messaging does not start with strangers — you can only chat with someone after you are connected, creating a more controlled and dependable communication experience. - No random messages from unknown users - No guessing who is on the other side - Just conversations with people and Agents you choose to connect with A TRUSTED NETWORK DDuet is designed to keep communication cleaner, safer, and more intentional. - Verified users can add and connect with others - Unverified users can only be added by verified users - Every connection is intentional and based on real identity - AI Agents are connected to DDuet so users can explore and chat with them in one trusted place SIMPLE, SECURE, AND EASY TO USE DDuet keeps the experience focused and easy for everyone. - Chat with AI Agents and trusted contacts - Real-time messaging with your connections - User-to-user voice and video calls - Quick and seamless signup with Single Sign-On (SSO) - Share your profile safely via QR code - Clean, focused experience with no unnecessary noise SECURITY THAT PROTECTS YOUR ACCOUNT DDuet adds an extra layer of protection for verified users. - Verified accounts are required to re-verify when signing in on a new device - Helps ensure the same person is accessing the account - Helps prevent unauthorized access and account misuse YOUR MESSAGES, YOUR CONTROL Your conversations are stored on your device only, so you stay in control of your own data. THE SIMPLEST WAY TO TALK TO AI AGENTS DDuet is built for a new kind of communication — where people can talk not only to each other, but also to the AI Agents created by others. Explore Agents. Start conversations. Connect with trusted people. All in one simple app.
Screenshots
Verdict
The clearest difference is in-app purchases: DDuet at none against SmartLine Second Phone Number's 2. DDuet also leads on update cadence (every 6 days vs every 2 months). SmartLine Second Phone Number's advantage is iOS requirement (12.1 vs 17.0). On price, ads 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. SmartLine Second Phone Number sells 2 in-app purchases, starting at $12.99 per month. DDuet asks for nothing beyond the download.
SmartLine Second Phone Number ships an update every 2 months, DDuet every 6 days. The most recent releases landed on October 25, 2026 and October 8, 2026 respectively.
| Parameter | SmartLine Second Phone Number | DDuet |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (44K ratings) — better | — |
| Positive reviews | 15.5% of reviews | — |
| Number of ratings | 44K — better | — |
| Update frequency | Every 2 months | Every 6 days — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Subscription | — |
| Devices | iPhone, iPod — better | iPhone |
| Requires iOS | 12.1 — better | 17.0 |
| Further details — not scored | ||
| Size | 75 MB | 74 MB |
| Age rating | 4+ | 17+ |
| Developer | GoDaddy.com, LLC | B3 Networks Pte Ltd |
Bugs and requests
SmartLine Second Phone Number
Reported bugs
3 issues- Disappearing call/text history
- Incorrect number display on outgoing calls
- Failure to sync across devices
Requested features
4 requests- Ability to send multiple photos/files
- Improved caller ID display
- Option to have multiple voicemail greetings
- Compatibility with VPNs and older devices
DDuet
Not enough reviews yet to summarise bugs or requests.
In-app purchases
SmartLine Second Phone Number
- SmartLine Unlimited (Monthly)7 Days trial$12.991 Month
- SmartLine Toll-Free7 Days trial$19.991 Month
DDuet
No in-app purchases
Questions
Is SmartLine Second Phone Number free?
Is DDuet free?
Do SmartLine Second Phone Number or DDuet have ads?
Which is updated more often, SmartLine Second Phone Number or DDuet?
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