# Digital Stamp Decoder vs Dr. Green・Plant Identifier

The clearest difference is price: Dr. Green・Plant Identifier at Free against Digital Stamp Decoder's $2.99. Dr. Green・Plant Identifier also leads on update cadence (every 11 days vs every 5 months) and ratings volume (277 vs 2). Digital Stamp Decoder's advantage is in-app purchases (none vs 2) and rating (5.0 vs 4.6). On ads and device support there is nothing between them.

Dr. Green・Plant Identifier is free to download; Digital Stamp Decoder costs $2.99 up front. Dr. Green・Plant Identifier sells 2 in-app purchases, starting at $3.99 per month. Digital Stamp Decoder asks for nothing beyond the download.

Digital Stamp Decoder holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: Dr. Green・Plant Identifier has 277 ratings behind it against 2, so its average is the more settled of the two.

Digital Stamp Decoder ships an update every 5 months, Dr. Green・Plant Identifier every 11 days. The most recent releases landed on June 1, 2026 and September 15, 2026 respectively.

## The numbers

| Metric | Digital Stamp Decoder | Dr. Green・Plant Identifier |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/digital-stamp-decoder/id1671241165/reviews)** | [4.6 (277 ratings)](https://appshunter.io/ios/app/dr-greenplant-identifier/id6581483550/reviews) |
| Number of ratings | 2 | **277** |
| Positive reviews | — | 70.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 11 days** |
| Monetization | Paid | **Free** |
| Size | 205 MB | 36 MB |
| Requires iOS | **15.6** | 17.6 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Graphic Security Systems Corp.](https://appshunter.io/developer/1176688211) | [ZFR NOVA SL](https://appshunter.io/developer/1754999835) |

## What reviewers say

### Digital Stamp Decoder

[App page](https://appshunter.io/ios/app/digital-stamp-decoder/id1671241165)

Reveal hidden images on USPS postage stamps using advanced Scrambled Indicia® technology. Originally designed for anti-counterfeiting, this app offers stamp collectors a unique way to authenticate and appreciate their collection. Explore the innovative world of philately with this modern collector's tool.

**Highlights:** Reveal hidden stamp images, Utilizes Scrambled Indicia® technology, Authenticates USPS postage stamps, Aids stamp collectors and philatelists, Showcase stamp collection

**In-app purchases:** none


### Dr. Green・Plant Identifier

[App page](https://appshunter.io/ios/app/dr-greenplant-identifier/id6581483550)

Instantly identify plants and minerals with AI, receive detailed care instructions, and diagnose plant diseases. Get personalized care plans, reminders, and even consult with botanists for expert advice.

**Highlights:** AI Plant Identification, Disease Diagnosis & Treatment, Personalized Care Plans, Care Reminders, Light Meter, Expert Botanist Consultation

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Dr. Green PRO Monthly | $3.99 | per month |
| Paywall | $24.99 | per year |


## Frequently asked questions

### Is Digital Stamp Decoder free?

Digital Stamp Decoder costs $2.99, with no in-app purchases.

### Is Dr. Green・Plant Identifier free?

Dr. Green・Plant Identifier is free to download, with in-app purchases available.

### Which has better reviews, Digital Stamp Decoder or Dr. Green・Plant Identifier?

Digital Stamp Decoder is rated higher. Digital Stamp Decoder averages 5.0 out of 5 from 2 ratings, while Dr. Green・Plant Identifier averages 4.6 from 277 ratings.

### Do Digital Stamp Decoder or Dr. Green・Plant Identifier have ads?

Neither Digital Stamp Decoder nor Dr. Green・Plant Identifier shows ads.

### Which is updated more often, Digital Stamp Decoder or Dr. Green・Plant Identifier?

Digital Stamp Decoder ships an update every 5 months, and Dr. Green・Plant Identifier every 11 days. Most recently, Digital Stamp Decoder was updated on June 1, 2026 and Dr. Green・Plant Identifier on September 15, 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.*