Comparison

OnlyAuth vs TwoLine

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

OnlyAuth

Features
Read full description

OnlyAuth 是一款快速、安全且易于使用的双重身份验证器(2FA),用于保护您的在线账户安全。 通过 OnlyAuth,您可以生成基于时间的一次性验证码(TOTP),即使密码泄露,也能有效防止账户被非法访问。 主要功能: • 支持 TOTP 验证(符合 RFC 6238 标准) • 离线使用,无需网络连接 • 简洁直观的用户界面 • 支持二维码扫描和手动添加账户 • 支持多个平台和账户 • 数据本地存储,更加安全 OnlyAuth 非常重视用户隐私,我们不会收集、存储或共享任何个人数据。 帮助您保护各类平台账户安全。 安全掌控,从 OnlyAuth 开始。

About

TwoLine

Features
Read full description

TwoLine helps you rent a second phone number for SMS verification, account setup, and privacy. Choose a supported country, pick a rental duration, add credits, and receive SMS messages in the app. Use TwoLine when you need a separate number without exposing your personal phone number. Active rentals show the phone number, expiry time, recent SMS messages, and clear policy information before purchase. Recent messages stay in one simple inbox so you can track codes and rental activity from the same place. What you can do with TwoLine: - Rent a 2nd phone number - Receive SMS verification codes - Use a separate number for account setup - Choose supported countries and rental durations - Manage active rentals and recent SMS messages - Add TwoLine credits through in-app purchases - Review refund and credit rules before renting - Delete account data from Settings TwoLine uses app credits. Store purchases add credits to your wallet, and rentals spend credits from that wallet. Some eligible rentals may offer a short credit-back window if no SMS arrives and cancellation succeeds. Credit-back is app credit only, not a cash refund. Important: TwoLine does not guarantee that any third-party app, website, financial service, bank, crypto exchange, or regulated platform will accept a rented number. Number availability, SMS delivery speed, app acceptance, and country support can vary by option. Review the rental policy before each purchase. TwoLine is not an emergency calling service and does not support voice calls. Privacy and account control: TwoLine creates an anonymous app account so wallet balance, rentals, and inbox messages can be tied to your device session. You can delete app account data from Settings. Privacy Policy, Terms of Use, and support links are available in the app and at twoline.io.

Screenshots

OnlyAuth3 screens
TwoLine4 screens

Verdict

The call

The clearest difference is in-app purchases: OnlyAuth at none against TwoLine's 5. On price, ads, device support and iOS requirement 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. TwoLine sells 5 one-off in-app purchases. OnlyAuth asks for nothing beyond the download.

Scorecard1 real difference · 5 level
OnlyAuth versus TwoLine: the parameters behind the verdict, then further details
ParameterOnlyAuthTwoLine
PriceFreeFree
Update frequency—Every 2 weeks
AdsNoNo
In-app purchasesNo — betterYes
DevicesiPhoneiPhone, iPod — better
Requires iOS16.615.1 — better
Further details — not scored
Size1 MB45 MB
Age rating4+4+
Developer秦毓 常SERHAT DOGAN

In-app purchases

None

OnlyAuth

No in-app purchases

5 purchases

TwoLine

One-time5
  • 5 TwoLine credits$4.99
  • 10 TwoLine credits$9.99
  • 25 TwoLine credits$24.99
Show 2 more
  • 50 TwoLine credits$49.99
  • 100 TwoLine credits$99.99

Questions

Is OnlyAuth free?
OnlyAuth is free to download, with no in-app purchases.
Is TwoLine free?
TwoLine is free to download, with in-app purchases available.
Do OnlyAuth or TwoLine have ads?
Neither OnlyAuth nor TwoLine shows ads.

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