# Optimal Authenticator vs BioSig

The clearest difference is rating: Optimal Authenticator at 3.0 against BioSig's 1.0. Optimal Authenticator also leads on ratings volume (4 vs 1). BioSig's advantage is iOS requirement (13.0 vs 15.0). 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.

Optimal Authenticator holds the better App Store score, 3.0 against 1.0. Both are backed by a comparable volume of ratings — 4 and 1 respectively.

## The numbers

| Metric | Optimal Authenticator | BioSig |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (4 ratings)](https://appshunter.io/ios/app/optimal-authenticator/id1217402923/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/biosig-id/id1611119275/reviews) |
| Number of ratings | **4** | 1 |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | — |
| Monetization | Free | Free |
| Size | 80 MB | 9 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Optimal IdM](https://appshunter.io/developer/1050742329) | [J.C. Lads Corporation](https://appshunter.io/developer/1611119277) |

## What reviewers say

### Optimal Authenticator

[App page](https://appshunter.io/ios/app/optimal-authenticator/id1217402923)

This app provides a secure way to verify your identity for accessing other applications. It uses two-factor authentication via push notifications or verification codes, and allows organizations to register trusted devices for sign-in requests.

**Highlights:** Two-factor authentication, Push notification verification, On-app verification codes, Trusted device registration, Secure identity verification

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

**In-app purchases:** none


### BioSig

[App page](https://appshunter.io/ios/app/biosig-id/id1611119275)

This app uses behavioral biometrics to create a unique digital signature based on how you draw. It offers a secure, passwordless authentication method that is difficult to replicate, aiming to eliminate fraud and impersonation.

**Highlights:** Behavioral biometrics analysis, Unique drawing signature creation, Passwordless authentication, Fraud and impersonation elimination, Device-centric security, Revoke and replace system

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Optimal Authenticator free?

Optimal Authenticator is free to download, with no in-app purchases.

### Is BioSig free?

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

### Which has better reviews, Optimal Authenticator or BioSig?

Optimal Authenticator is rated higher. Optimal Authenticator averages 3.0 out of 5 from 4 ratings, while BioSig averages 1.0 from 1 ratings.

### Do Optimal Authenticator or BioSig have ads?

Neither Optimal Authenticator nor BioSig shows ads.

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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.*