# Stamp Identifier vs ChemNotes

The clearest difference is in-app purchases: ChemNotes at none against Stamp Identifier's 2. ChemNotes also leads on update cadence (every 2 weeks vs every 4 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Stamp Identifier sells 2 in-app purchases, starting at $4.99 per 7 days. ChemNotes asks for nothing beyond the download.

Stamp Identifier ships an update every 4 months, ChemNotes every 2 weeks. The most recent releases landed on November 12, 2026 and November 9, 2026 respectively.

## The numbers

| Metric | Stamp Identifier | ChemNotes |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (28 ratings)](https://appshunter.io/ios/app/stamp-identifier/id6748842645/reviews)** | — |
| Number of ratings | **28** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 weeks** |
| Monetization | Free | — |
| Size | 32 MB | 4 MB |
| Requires iOS | **17.0** | 18.0 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Kawaii](https://appshunter.io/developer/1696001381) | [SOROOSH GHAREHGOZLO](https://appshunter.io/developer/1851464333) |

## What reviewers say

### Stamp Identifier

[App page](https://appshunter.io/ios/app/stamp-identifier/id6748842645)

Instantly identify any stamp with AI-powered precision by simply taking a photo. Get detailed philatelic analysis, market values, and condition grading in seconds. Organize your collection and explore stamps from collectors worldwide.

**Highlights:** AI-powered stamp identification, Detailed stamp analysis, Professional condition grading, Accurate market valuations, Cross-reference catalog listings, Build and organize digital collection, Community gallery for discovery

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Stamp Identifier Pro (Weekly) | $4.99 | per 7 days |
| Stamp Identifier Pro (Yearly) | $29.99 | per year |


### ChemNotes

[App page](https://appshunter.io/ios/app/chemnotes/id6755041959)

**In-app purchases:** none


## Frequently asked questions

### Is Stamp Identifier free?

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

### Is ChemNotes free?

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

### Do Stamp Identifier or ChemNotes have ads?

Neither Stamp Identifier nor ChemNotes shows ads.

### Which is updated more often, Stamp Identifier or ChemNotes?

Stamp Identifier ships an update every 4 months, and ChemNotes every 2 weeks. Most recently, Stamp Identifier was updated on November 12, 2026 and ChemNotes on November 9, 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.*