# EngSyno vs StampValue

The clearest difference is price: StampValue at Free against EngSyno's $0.99. StampValue also leads on update cadence (every 9 days vs every 20 months). EngSyno's advantage is in-app purchases (none vs 2) and iOS requirement (12.0 vs 15.1). On ads and device support there is nothing between them.

StampValue is free to download; EngSyno costs $0.99 up front. StampValue sells 2 in-app purchases, starting at $4.99 per 7 days. EngSyno asks for nothing beyond the download.

EngSyno ships an update every 20 months, StampValue every 9 days. The most recent releases landed on September 21, 2026 and September 27, 2026 respectively.

## The numbers

| Metric | EngSyno | StampValue |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | — | **[4.2 (18 ratings)](https://appshunter.io/ios/app/stampvalue-stamp-identifier-plus/id6751752714/reviews)** |
| Number of ratings | — | **18** |
| Positive reviews | — | 66.7% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 20 months | **Every 9 days** |
| Monetization | — | Free with in-app purchases |
| Size | 45 MB | 49 MB |
| Requires iOS | **12.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Bo Peters](https://appshunter.io/developer/495903931) | [伟烽 莫](https://appshunter.io/developer/1821461071) |

## What reviewers say

### EngSyno

[App page](https://appshunter.io/ios/app/engsyno/id527615366)

**Features:** macOS Compatibility

**In-app purchases:** none


### StampValue

[App page](https://appshunter.io/ios/app/stampvalue-stamp-identifier-plus/id6751752714)

Instantly identify and evaluate stamps using AI and a comprehensive database. Track your collection, calculate its total value, and learn about philately. Ideal for both new and experienced collectors.

**Highlights:** AI stamp recognition, Built-in stamp database, Favorites and value calculator, Collection management, Stamp value estimation

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| StampValue Pro Weekly (1 Week) | $4.99 | per 7 days |
| StampValue Pro Yearly (1 Year) | $29.99 | per year |


## Frequently asked questions

### Is EngSyno free?

EngSyno costs $0.99, with no in-app purchases.

### Is StampValue free?

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

### Do EngSyno or StampValue have ads?

Neither EngSyno nor StampValue shows ads.

### Which is updated more often, EngSyno or StampValue?

EngSyno ships an update every 20 months, and StampValue every 9 days. Most recently, EngSyno was updated on September 21, 2026 and StampValue on September 27, 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.*