Comparison

Authenticator 2FA by KeepSolid vs Duo Authenticator

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

Head to head
About

Authenticator 2FA by KeepSolid

This app generates time-based one-time passwords to add an extra layer of security for your online accounts. It supports multi-factor authentication for services like Facebook, Google, and Amazon, protecting your data from unauthorized access. The app offers multi-device support and a user-friendly interface.

Highlights
  • Two-factor authentication (TFA/2FA)
  • Time-based one-time passwords (TOTP)
  • Multi-device support
  • Secure code generation
  • User-friendly interface
  • Account aggregation
Features
Read full description

Authenticator by KeepSolid is a utility app used with Facebook, Google, Amazon, and other apps to create an extra layer of two-factor (TFA or 2FA) protection when accessing your accounts. With this code generator, you can add a second validation challenge in addition to logins and passwords and protect your data from any unauthorized access. Multi-factor authentication with time-based one-time passwords (TOTP) guarantees access to your account for only verified parties whatever service you use, Facebook, Google, GitHub, Sony PlayStation, or Steam. This mobile app generates time-based one-time passwords that are more secure than event-based ones and widely used in creating security keys for multi-factor or two-factor authentication. WHAT IS TWO-FACTOR AUTHENTICATION (TFA) Two-factor authentication is a security method that requires two separate forms of identification to access your account: something you know (your password) and something you have (a special code from the TFA app on your trusted device). For instance, even if hackers get your password they will not be able to get access to your Binance or Amazon account as they will not have the secret code from Authenticator Mobile App. HOW THE AUTHENTICATOR APP WORKS When you activate the TFA in any service, you can add KeepSolid Authenticator as a second authentication factor. For example, after you add your Instagram or Facebook account to the Authenticator app, it will generate a time-based one-time password that you can use to confirm that it's you logging in to a website or service. BENEFITS OF MULTI-FACTOR AUTHENTICATION AND AUTHENTICATOR APP We use a myriad of online services every day: Instagram, Facebook, Amazon, Binance, etc. and each of them contains sensitive information that we need to protect. If you don’t want to become a victim of identity theft or data leakage, you need a verified authenticator app. Multi-device support. If you decide to use another device for two-factor authentication you don’t need to transfer each separate account manually. You will be able to create an archive file which you can save wherever you want and import your items on a new device. Secure 2FA protection. Using the verified KeepSolid Authenticator app to generate time-based one-time passwords is more secure than text messaging or email. The primary reason is that it's more difficult for a third party to gain physical access to your device and generate a code without you knowing about it. User-friendly navigation and interface. The Authenticator app by KeepSolid was designed with all users in mind. With our app, you don’t need special technical knowledge to activate the two-factor authentication (TFA) or use the time-based one-time passwords on any service you use. All the code generator interface elements are intuitive. All accounts in one place. With our TOTP code generator, you can link many accounts with TFA enabled and you will don’t need to register new emails to use Multi-factor authentication or TFA on new accounts. All your time-based one-time passwords will be kept in one place. The KeepSolid Authenticator app will provide you with an extra layer of security for your Microsoft Windows, Apple, Sony, or any other accounts. With multi-factor authentication and time-based one-time passwords, you don’t need to rely on a single password. With the rising number of identity thefts and cyber attacks in 2022, you have every reason to look for better ways to stay safe on the web. And The KeepSolid Authenticator App is the solution.

About

Duo Authenticator

Enhance your online security with this multi-factor authentication app. It provides an extra layer of protection for your accounts by generating time-sensitive codes, even when offline. Secure your sensitive information with ease and peace of mind.

Highlights
  • Quick and easy setup
  • Wide service compatibility
  • Time-sensitive security codes
  • Offline code generation
  • End-to-end encryption
  • Security code protection
Features
Read full description

As cyber threats continue to become more sophisticated, it's essential to use strong and reliable security measures to protect your online accounts. That's where MFA Authenticator comes in – a mobile app designed to provide an extra layer of security to your online accounts, making it harder for hackers to gain access to your sensitive information. One of the most significant advantages of using MFA Authenticator is its ease of use. With this app, you can set up two-factor authentication (2FA) quickly, making it easy to secure your accounts. You can use MFA Authenticator with a wide range of services, including Google, Facebook, Dropbox, and many more. The app generates unique, time-sensitive codes that you can use to verify your identity when logging in to your accounts, ensuring that only you can access your information. Another great feature of MFA Authenticator is its ability to work offline. Unlike some other 2FA solutions that rely on an internet connection, MFA Authenticator can generate codes even when your phone isn't connected to the internet. This feature is particularly useful when traveling or in areas with a weak or non-existent internet connection. MFA Authenticator is also designed to be highly secure, with a range of measures in place to keep your information safe. For example, the app uses end-to-end encryption to ensure that your codes are only visible to you. Additionally, the app has a built-in security code that you need to enter when setting up the app, ensuring that only you can access your account. • Quick and easy to set up • Compatible with a wide range of services • Generates unique, time-sensitive codes for added security • Works offline, making it ideal for travel • Uses end-to-end encryption to keep your information safe • Requires a security code for added protection. Overall, MFA Authenticator is an excellent app that can help you stay safe and secure online. With its ease of use, offline functionality, and strong security features, you can rest assured that your information is well-protected. So why not give it a try and take your online security to the next level? Terms of service: https://www.code4flutter.in/terms-mfauthenticator

Screenshots

Authenticator 2FA by KeepSolid4 screens
Duo Authenticator4 screens

Verdict

The call

The clearest difference is in-app purchases: Authenticator 2FA by KeepSolid at none against Duo Authenticator's 3. Authenticator 2FA by KeepSolid also leads on ads (none vs shown) and review sentiment (75% vs 50%). Duo Authenticator's advantage is rating (4.2 vs 3.9). On price, ratings volume and update cadence 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. Duo Authenticator sells 3 in-app purchases, starting at $3.99 per 7 days. Authenticator 2FA by KeepSolid asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Duo Authenticator holds the better App Store score, 4.2 against 3.9. Both are backed by a comparable volume of ratings — 11 and 24 respectively. Written reviews complicate that: 75% of Authenticator 2FA by KeepSolid's written reviews are positive against 50% of Duo Authenticator's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly monthly. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

Scorecard7 real differences · 3 level
Authenticator 2FA by KeepSolid versus Duo Authenticator: the parameters behind the verdict, then further details
ParameterAuthenticator 2FA by KeepSolidDuo Authenticator
PriceFreeFree
Rating3.9 (11 ratings)4.2 (24 ratings) — better
Positive reviews75.0% of reviews — better50.0% of reviews
Number of ratings1124 — better
Update frequencyMonthlyMonthly
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationAd-supported — betterFree with in-app purchases
DevicesiPhone, iPad, iPod, Apple Watch — betteriPhone
Requires iOS14.0 — better16.6
Further details — not scored
Size45 MB61 MB
Age rating4+4+
DeveloperKeepSolid Inc.Petr Polasek

Customer experience

Authenticator 2FA by KeepSolid

All ratings11 ratings
Positive72.7%
Neutral0.0%
Negative27.3%
Written reviews4 reviews
Positive75.0%
Neutral0.0%
Negative25.0%

Duo Authenticator

All ratings24 ratings
Positive83.3%
Neutral0.0%
Negative16.7%
Written reviews4 reviews
Positive50.0%
Neutral0.0%
Negative50.0%

In-app purchases

None

Authenticator 2FA by KeepSolid

No in-app purchases

3 purchases

Duo Authenticator

Subscriptions3
  • Premium 1 Week$3.997 Days
  • Premium 1 Month1 Month trial$9.991 Month
  • Premium 1 Year3 Days trial$29.991 Year

Questions

Is Authenticator 2FA by KeepSolid free?
Authenticator 2FA by KeepSolid is free to download, with no in-app purchases.
Is Duo Authenticator free?
Duo Authenticator is free to download, with in-app purchases available.
Which has better reviews, Authenticator 2FA by KeepSolid or Duo Authenticator?
Duo Authenticator is rated higher. Authenticator 2FA by KeepSolid averages 3.9 out of 5 from 11 ratings, while Duo Authenticator averages 4.2 from 24 ratings.
Do Authenticator 2FA by KeepSolid or Duo Authenticator have ads?
Duo Authenticator shows ads; Authenticator 2FA by KeepSolid does not.
Which is updated more often, Authenticator 2FA by KeepSolid or Duo Authenticator?
Authenticator 2FA by KeepSolid ships an update monthly, and Duo Authenticator monthly. Most recently, Authenticator 2FA by KeepSolid was updated on October 24, 2026 and Duo Authenticator on October 25, 2026.

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