# RSA Authenticator (SecurID) vs Saybolt Viscosity

The clearest difference is ratings volume: RSA Authenticator (SecurID) at 335 against Saybolt Viscosity's 2. RSA Authenticator (SecurID) also leads on update cadence (every 3 months vs every 14 months) and chart position (#161 vs unranked). Saybolt Viscosity's advantage is rating (3.0 vs 2.7) and iOS requirement (9.3 vs 16.0). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Saybolt Viscosity holds the better App Store score, 3.0 against 2.7. That said, the two scores are not equally well evidenced: RSA Authenticator (SecurID) has 335 ratings behind it against 2, so its average is the more settled of the two.

RSA Authenticator (SecurID) ships an update every 3 months, Saybolt Viscosity every 14 months. The most recent releases landed on November 10, 2026 and November 1, 2026 respectively.

## The numbers

| Metric | RSA Authenticator (SecurID) | Saybolt Viscosity |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.7 (335 ratings)](https://appshunter.io/ios/app/rsa-authenticator-securid/id318038618/reviews) | **[3.0 (2 ratings)](https://appshunter.io/ios/app/saybolt-viscosity/id631153914/reviews)** |
| Number of ratings | **335** | 2 |
| Positive reviews | 26.6% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 14 months |
| Monetization | Free | Free |
| Best chart rank | **#161** | — |
| Size | 64 MB | 3 MB |
| Requires iOS | 16.0 | **9.3** |
| Devices | iPhone, Mac | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [RSA Security](https://appshunter.io/developer/318038621) | [Saybolt International B.V.](https://appshunter.io/developer/493919167) |

## What reviewers say

### RSA Authenticator (SecurID)

[App page](https://appshunter.io/ios/app/rsa-authenticator-securid/id318038618)

**Currently charting:** #161 Top Free · Business (US App Store)

This app provides multi-factor authentication for enterprises, offering passwordless security through device-bound passkeys. It supports various authentication methods like OTP, biometrics, and push notifications to secure digital access.

**Highlights:** Multi-Factor Authentication (MFA), Passwordless Security with Passkeys, One-Time Passcodes (OTP), Push Notifications, Biometric Authentication, QR Code Authentication

**In-app purchases:** none

**What reviewers like**

- 🚀 Works great
- 🔒 Secure authentication
- 👍 Easy to use
- 🚀 Convenient alternative to hardware token

**What reviewers complain about**

- 🐛 Face ID bug
- 🐛 Persistent token disappearing issue
- 🐛 Buggy app
- 🤔 Confusing UI changes
- 🤔 Ugly app icon

**Reported bugs**

- App crashes on launch
- Token import/sync issues
- Incompatibility with newer iOS versions
- Incorrect token generation on wrong PIN entry

**Requested features**

- Add Apple Watch support
- Implement Face ID/Touch ID authentication
- Allow copying/pasting of token
- Provide option to customize notification sounds
- Add widget for quick token access


### Saybolt Viscosity

[App page](https://appshunter.io/ios/app/saybolt-viscosity/id631153914)

This application serves as a calculator for converting viscosity and temperature values for petroleum fuels. It allows users to convert Kinematic Viscosity in Centistokes to desired target values across different temperature scales. In landscape mode, it transforms into a slider for visual comparison of viscosity units.

**Highlights:** Viscosity/Temperature conversion calculator, Converts Kinematic Viscosity (cSt), Supports Fahrenheit and Celsius, Landscape slider for unit comparison, Compares Centistokes to Saybolt Universal Seconds and Furol

**In-app purchases:** none


## Frequently asked questions

### Is RSA Authenticator (SecurID) free?

RSA Authenticator (SecurID) is free to download, with no in-app purchases.

### Is Saybolt Viscosity free?

Saybolt Viscosity is free to download, with no in-app purchases.

### Which has better reviews, RSA Authenticator (SecurID) or Saybolt Viscosity?

Saybolt Viscosity is rated higher. RSA Authenticator (SecurID) averages 2.7 out of 5 from 335 ratings, while Saybolt Viscosity averages 3.0 from 2 ratings.

### Do RSA Authenticator (SecurID) or Saybolt Viscosity have ads?

Neither RSA Authenticator (SecurID) nor Saybolt Viscosity shows ads.

### Which is updated more often, RSA Authenticator (SecurID) or Saybolt Viscosity?

RSA Authenticator (SecurID) ships an update every 3 months, and Saybolt Viscosity every 14 months. Most recently, RSA Authenticator (SecurID) was updated on November 10, 2026 and Saybolt Viscosity on November 1, 2026.

---

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