# Web PKI vs Grain SA

The clearest difference is update cadence: Grain SA at monthly against Web PKI's every 2 months. Web PKI's advantage is iOS requirement (8.2 vs 10.2). On price, ads, in-app purchases and device support there is nothing between them.

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

Web PKI ships an update every 2 months, Grain SA monthly. The most recent releases landed on September 22, 2026 and September 8, 2026 respectively.

## The numbers

| Metric | Web PKI | Grain SA |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.0 (4 ratings)](https://appshunter.io/ios/app/web-pki/id1390701957/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 30.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Monthly** |
| Monetization | Free | — |
| Size | 98 MB | 98 MB |
| Requires iOS | **8.2** | 10.2 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Lacuna Software](https://appshunter.io/developer/1390701956) | [4SIGHT SYSTEMS (PTY) LTD](https://appshunter.io/developer/656095757) |

## What reviewers say

### Web PKI

[App page](https://appshunter.io/ios/app/web-pki/id1390701957)

Perform digital signatures using certificates from your mobile device on compatible websites and applications. Securely authenticate documents and transactions on the go.

**Highlights:** Digital signatures with mobile certificates, Compatibility with websites, Compatibility with applications, Secure authentication

**Features:** Vision Pro support

**In-app purchases:** none


### Grain SA

[App page](https://appshunter.io/ios/app/grain-sa/id1665831580)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Web PKI free?

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

### Is Grain SA free?

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

### Do Web PKI or Grain SA have ads?

Neither Web PKI nor Grain SA shows ads.

### Which is updated more often, Web PKI or Grain SA?

Web PKI ships an update every 2 months, and Grain SA monthly. Most recently, Web PKI was updated on September 22, 2026 and Grain SA on September 8, 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.*