# ISN Sentinel vs Silver Hallmark Identifier

The clearest difference is in-app purchases: ISN Sentinel at none against Silver Hallmark Identifier's 2. ISN Sentinel also leads on iOS requirement (11.0 vs 15.1). Silver Hallmark Identifier's advantage is update cadence (every 8 days vs every 5 months). On price, ads and device support there is nothing between them.

Both are free to download. Silver Hallmark Identifier sells 2 in-app purchases, starting at $3.99 per 7 days. ISN Sentinel asks for nothing beyond the download.

ISN Sentinel ships an update every 5 months, Silver Hallmark Identifier every 8 days. The most recent releases landed on October 26, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | ISN Sentinel | Silver Hallmark Identifier |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.7 (3 ratings)](https://appshunter.io/ios/app/silver-hallmark-identifier/id6757441506/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 8 days** |
| Monetization | — | Freemium |
| Size | 7 MB | 44 MB |
| Requires iOS | **11.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Aleut Community of St. Paul Island Tribal Government](https://appshunter.io/developer/1329178887) | [EternalBeam Software](https://appshunter.io/developer/1795031062) |

## What reviewers say

### ISN Sentinel

[App page](https://appshunter.io/ios/app/isn-sentinel/id1329189735)

**Features:** macOS Compatibility

**In-app purchases:** none


### Silver Hallmark Identifier

[App page](https://appshunter.io/ios/app/silver-hallmark-identifier/id6757441506)

Instantly identify silver hallmarks using AI by simply photographing them. This app also features a silver value calculator and tools to help detect fake silver, making it an indispensable companion for collectors and enthusiasts.

**Highlights:** AI-powered hallmark scanning, Silver value calculator, Fake silver detection checklist, International hallmark recognition, Collection management tools, Purity and date letter guides

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Weekly | $3.99 | per 7 days |
| Premium Yearly | $29.99 | per year |


## Frequently asked questions

### Is ISN Sentinel free?

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

### Is Silver Hallmark Identifier free?

Silver Hallmark Identifier is free to download, with in-app purchases available.

### Do ISN Sentinel or Silver Hallmark Identifier have ads?

Neither ISN Sentinel nor Silver Hallmark Identifier shows ads.

### Which is updated more often, ISN Sentinel or Silver Hallmark Identifier?

ISN Sentinel ships an update every 5 months, and Silver Hallmark Identifier every 8 days. Most recently, ISN Sentinel was updated on October 26, 2026 and Silver Hallmark Identifier on October 24, 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.*