# DuoLine vs SMS Online

The clearest difference is review sentiment: SMS Online at 85% against DuoLine's 0%. SMS Online also leads on rating (4.4 vs 2.0) and ratings volume (107 vs 2). DuoLine's advantage is update cadence (every 8 days vs every 6 months) and iOS requirement (12.0 vs 15.6). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. DuoLine sells 6 in-app purchases, starting at $4.99 per 7 days and SMS Online sells 6 in-app purchases, starting at $7.99 per 7 days. Whichever you choose, the download price is not the number that matters.

SMS Online holds the better App Store score, 4.4 against 2.0. That said, the two scores are not equally well evidenced: SMS Online has 107 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 0% of DuoLine's written reviews are positive against 85% of SMS Online's.

DuoLine ships an update every 8 days, SMS Online every 6 months. Both last shipped on November 12, 2026.

## The numbers

| Metric | DuoLine | SMS Online |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.0 (2 ratings)](https://appshunter.io/ios/app/duoline-second-mobile-number/id6447859028/reviews) | **[4.4 (107 ratings)](https://appshunter.io/ios/app/sms-online-sms-verification/id6547871787/reviews)** |
| Number of ratings | 2 | **107** |
| Positive reviews | 0.0% of reviews | **85.4% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 8 days** | Every 6 months |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 57 MB | 52 MB |
| Requires iOS | **12.0** | 15.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [SORO SONS BILGI TEKNOLOJISI TICARET LIMITED SIRKETI](https://appshunter.io/developer/1091025398) | [Huseyin Varelci](https://appshunter.io/developer/1757682971) |

## What reviewers say

### DuoLine

[App page](https://appshunter.io/ios/app/duoline-second-mobile-number/id6447859028)

Obtain a secondary phone number for private calls, business use, or social media verification. Manage multiple lines easily without a second device. Enjoy unlimited calling and international access with robust privacy options.

**Highlights:** Second phone number for private use, Business communication line, Social media verification codes, Unlimited calling, International calls, Ad-free experience, No extra SIM card needed

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 Number Weekly | $4.99 | per 7 days |
| 1 Number Monthly | $9.99 | per month |
| 3 Number Weekly | $12.99 | per 7 days |
| 5 Number Weekly | $19.99 | per 7 days |
| 3 Number Monthly | $24.99 | per month |
| 5 Number Monthly | $44.99 | per month |


### SMS Online

[App page](https://appshunter.io/ios/app/sms-online-sms-verification/id6547871787)

Receive SMS messages securely and privately using virtual phone numbers. Ideal for account verification on various online services and apps, offering a disposable second number for enhanced privacy and convenience.

**Highlights:** Instant disposable numbers, Easy SMS reception, Simple account verification, Enhanced privacy, Transparent pricing, Virtual numbers for WhatsApp, Telegram, Instagram

**Features:** macOS Compatibility, Family Sharing, Vision Pro support

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Virtual Number Unlimeted SMS | $7.99 | per 7 days |
| Virtual Number Unlimited SMS | $11.99 | per month |
| Virtual Number 1 Credit | $9.99 | one-time |
| Virtual Number 3 Credit | $14.99 | one-time |
| Virtual Number 5 Credit | $19.99 | one-time |
| Virtual Number 9 Credit | $29.99 | one-time |

**What reviewers like**

- 🚀 Fast and easy performance
- 👍 User friendly interface
- 👍 Smooth and easy to use
- 👍 Convenient and helpful
- 👍 Works good and trusted

**What reviewers complain about**

- 🐛 Fake app
- 🐛 Fraud scam
- 🐛 Another fee after subscribe
- 🐛 No live chat support

**Reported bugs**

- Subscription issues
- Delayed or no number delivery

**Requested features**

- Ability to receive calls
- Promo code availability


## Frequently asked questions

### Is DuoLine free?

DuoLine is free to download, with in-app purchases available.

### Is SMS Online free?

SMS Online is free to download, with in-app purchases available.

### Which has better reviews, DuoLine or SMS Online?

SMS Online is rated higher. DuoLine averages 2.0 out of 5 from 2 ratings, while SMS Online averages 4.4 from 107 ratings.

### Do DuoLine or SMS Online have ads?

Neither DuoLine nor SMS Online shows ads.

### Which is updated more often, DuoLine or SMS Online?

DuoLine ships an update every 8 days, and SMS Online every 6 months. Most recently, DuoLine was updated on November 12, 2026 and SMS Online on November 12, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*