# iSign vs Authenticator App

The clearest difference is review sentiment: iSign at 100% against Authenticator App's 0%. iSign also leads on rating (5.0 vs 4.5) and update cadence (fortnightly vs monthly). Authenticator App's advantage is ratings volume (24 vs 1) and iOS requirement (15.0 vs 18.0). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. iSign sells 4 in-app purchases, starting at $0.99 per month and Authenticator App sells 4 in-app purchases, starting at $4.99 per 7 days. Whichever you choose, the download price is not the number that matters.

iSign holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: Authenticator App has 24 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 100% of iSign's written reviews are positive against 0% of Authenticator App's.

iSign ships an update fortnightly, Authenticator App monthly. Both last shipped on September 29, 2026.

## The numbers

| Metric | iSign | Authenticator App |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/isign-pdf-reader-ai-editor/id6444390217/reviews)** | [4.5 (24 ratings)](https://appshunter.io/ios/app/authenticator-app-duo-secure/id6470662300/reviews) |
| Number of ratings | 1 | **24** |
| Positive reviews | **100.0% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Fortnightly** | Monthly |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 69 MB | 101 MB |
| Requires iOS | 18.0 | **15.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Bruno Wide](https://appshunter.io/developer/1262013609) | [Apperture Limited](https://appshunter.io/developer/1727867515) |

## What reviewers say

### iSign

[App page](https://appshunter.io/ios/app/isign-pdf-reader-ai-editor/id6444390217)

Transform any document into a searchable, signable PDF. Scan, organize, and edit with AI-powered summaries and OCR. Your data remains private on your device.

**Highlights:** Scan documents to PDF, Automatic edge detection, Edit and sign documents, OCR text recognition, AI-powered summaries, On-device data storage

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Scanner Pro - Monthly Promo | $0.99 | per month |
| Scanner Pro - Monthly | $1.99 | per month |
| Scanner Pro - Yearly Promo | $9.99 | per year |
| Scanner Pro - Yearly | $19.99 | per year |


### Authenticator App

[App page](https://appshunter.io/ios/app/authenticator-app-duo-secure/id6470662300)

Enhance digital security with a multi-factor authenticator app. It provides an extra layer of protection for sensitive accounts and information, working offline for reliable access. Protect email, social media, financial accounts, and more with this user-friendly solution.

**Highlights:** Multi-factor authentication, Offline 2FA code generation, Wide service integration, User-friendly interface, Enhanced account protection

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Version | $4.99 | per 7 days |
| Pro Version | $7.99 | per 7 days |
| Pro Version | $14.99 | per month |
| Pro Version | $39.99 | per year |


## Frequently asked questions

### Is iSign free?

iSign is free to download, with in-app purchases available.

### Is Authenticator App free?

Authenticator App is free to download, with in-app purchases available.

### Which has better reviews, iSign or Authenticator App?

iSign is rated higher. iSign averages 5.0 out of 5 from 1 ratings, while Authenticator App averages 4.5 from 24 ratings.

### Do iSign or Authenticator App have ads?

Neither iSign nor Authenticator App shows ads.

### Which is updated more often, iSign or Authenticator App?

iSign ships an update fortnightly, and Authenticator App monthly. Most recently, iSign was updated on September 29, 2026 and Authenticator App on September 29, 2026.

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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.*