Comparison

Open Authenticator by Skyost vs Alerta app

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

Head to head
About

Open Authenticator by Skyost

This app generates Time-Based One-Time Passwords (TOTPs) to enhance online account security through two-factor authentication. It offers cross-platform syncing, a self-hostable backend, and an intuitive interface for managing your security codes.

Highlights
  • Generates Time-Based One-Time Passwords (TOTPs)
  • Enhances online account security with 2FA
  • Cross-platform token syncing
  • Self-hostable backend option
  • Fast and easy-to-use interface
  • Open-source and free for local use
Read full description

PROTECT YOUR ONLINE ACCOUNTS WITH OPEN AUTHENTICATOR Open Authenticator generates Time-Based One-Time Passwords (TOTPs), which serve as the second factor in the 2FA process. These temporary codes are valid for a short period of time and are used alongside your password to verify your identity when logging into your accounts. This significantly enhances the security of your online accounts and protects them from unauthorized access. KEY FEATURES - Open-Source & Free to use : Our commitment to transparency and security means our app is open-source and will always remain free for local use. If it doesn't cost anything for us, then it shouldn't cost anything for you ! - Cross-Platform Compatibility : Seamlessly sync your TOTP tokens across all your devices, whether you're using iOS, macOS or another platform. - Self-Hostable Backend : You can host the backend on your own server. Your data, your choice. - A lovely crafted app : Open Authenticator has been designed to be fast and easy to use. Quickly find all your TOTPs and copy them directly from the main page ! IN SUMMARY, WHY OPEN AUTHENTICATOR ? Here are the reasons why you should download Open Authenticator : - Enhanced Security : Protect your online accounts from unauthorized access with strong 2FA. - User-Friendly Interface : Intuitive design makes it easy to add, manage, and organize your TOTP tokens. - Continuous Improvement : We're dedicated to delivering the best user experience and regularly update our app with new features and improvements. LINKS - Check it out on Github : https://github.com/openauthenticator-app/openauthenticator - Visit our website : https://openauthenticator.app LEGAL - Privacy policy : https://openauthenticator.app/privacy-policy - Terms of service : https://openauthenticator.app/terms-of-service

About

Alerta app

Features
Read full description

Your Personal Safety Button — Always With You (Subscription Required) All features of the app require an active subscription. There is no free functionality. Feel the need to reach someone quickly? With one tap, Alerta places a call to a number you choose and sends SMS alerts with your current location to your selected contacts. Perfect For: • Walking alone • Traveling in unfamiliar places • Individuals who want fast access to trusted contacts • Students, commuters, and solo travelers • Anyone seeking extra peace of mind Key Features (with subscription): • One-Tap Quick Call — Instantly dial a contact you choose • Location Sharing via SMS — Sends alerts with your current location • Works Anywhere — Uses your phone’s normal calling and SMS capabilities • Preset Alert Messages — The app sends clear, predefined SMS alerts • Privacy-Focused — No location or data is used unless you activate an alert • Simple and Fast — Designed for quick communication when you need it How It Works: 1. Subscribe to activate all features 2. Add the phone number you want Alerta to call 3. Choose the contacts who will receive SMS alerts 4. Tap the button when you want to reach out 5. Alerta places the call and sends SMS alerts with your location SMS delivery depends on your mobile carrier and signal availability. Important Notice Alerta does not provide or replace emergency services. It simply initiates a direct phone call and sends SMS messages to the contacts you choose. Users are responsible for selecting numbers appropriate for their situation. Subscription Information A subscription is required to use all features of the app. Subscription pricing and duration are clearly displayed before purchase. Terms of Use: https://ios.alerta-app.net/terms-of-use Privacy Policy: https://ios.alerta-app.net/privacy-policy Standard Apple Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ A Restore Purchases option is available in the app. Your Safety Matters Having quick access to trusted contacts can offer valuable peace of mind. Download Alerta and stay connected when it matters most.

Screenshots

Open Authenticator by Skyost3 screens
Alerta app4 screens

Verdict

The call

The clearest difference is device support: Open Authenticator by Skyost at 4 against Alerta app's 2. Open Authenticator by Skyost also leads on iOS requirement (15.0 vs 17.6). 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Open Authenticator by Skyost sells 2 in-app purchases, starting at $0.99 per month and Alerta app sells 2 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Open Authenticator by Skyost ships an update fortnightly, Alerta app every 10 days. The most recent releases landed on October 14, 2026 and October 1, 2026 respectively.

Scorecard2 real differences · 8 level
Open Authenticator by Skyost versus Alerta app: the parameters behind the verdict, then further details
ParameterOpen Authenticator by SkyostAlerta app
PriceFreeFree
Rating4.4 (9 ratings) — better—
Positive reviews0.0% of reviews—
Number of ratings9 — better—
Update frequencyFortnightlyEvery 10 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPod, Mac — betteriPhone, iPad
Requires iOS15.0 — better17.6
Further details — not scored
Size56 MB75 MB
Age rating4+12+
DeveloperHugo DelaunayNOPOINT Limited

In-app purchases

2 purchases

Open Authenticator by Skyost

Subscriptions2
  • Contributor Plan: Monthly$0.991 Month
  • Contributor Plan: Annual$9.991 Year
2 purchases

Alerta app

Subscriptions2
  • Monthly$1.991 Month
  • Yearly14 Days trial$17.991 Year

Questions

Is Open Authenticator by Skyost free?
Open Authenticator by Skyost is free to download, with in-app purchases available.
Is Alerta app free?
Alerta app is free to download, with in-app purchases available.
Do Open Authenticator by Skyost or Alerta app have ads?
Neither Open Authenticator by Skyost nor Alerta app shows ads.
Which is updated more often, Open Authenticator by Skyost or Alerta app?
Open Authenticator by Skyost ships an update fortnightly, and Alerta app every 10 days. Most recently, Open Authenticator by Skyost was updated on October 14, 2026 and Alerta app on October 1, 2026.

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