# Caterpillar Identifier vs Project Monarch Science

The clearest difference is review sentiment: Project Monarch Science at 60% against Caterpillar Identifier's 0%. Project Monarch Science also leads on rating (4.0 vs 2.6) and in-app purchases (none vs 1). Caterpillar Identifier's advantage is iOS requirement (13.0 vs 15.0). On price, ads and device support there is nothing between them.

Both are free to download. Caterpillar Identifier sells 1 in-app purchase, starting at $9.99 per month. Project Monarch Science asks for nothing beyond the download.

Project Monarch Science holds the better App Store score, 4.0 against 2.6. Both are backed by a comparable volume of ratings — 9 and 28 respectively. Written reviews point the same way: 0% of Caterpillar Identifier's written reviews are positive against 60% of Project Monarch Science's.

Caterpillar Identifier ships an update every 2 months, Project Monarch Science every 10 days. The most recent releases landed on October 23, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | Caterpillar Identifier | Project Monarch Science |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.6 (9 ratings)](https://appshunter.io/ios/app/caterpillar-identifier/id1642311954/reviews) | **[4.0 (28 ratings)](https://appshunter.io/ios/app/project-monarch-science/id6460006970/reviews)** |
| Number of ratings | 9 | **28** |
| Positive reviews | 0.0% of reviews | **60.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 10 days** |
| Monetization | Subscription | **Free** |
| Size | 7 MB | 83 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Tolkyn Raimbayeva](https://appshunter.io/developer/1692087944) | [Cellular Tracking Technologies](https://appshunter.io/developer/1588087267) |

## What reviewers say

### Caterpillar Identifier

[App page](https://appshunter.io/ios/app/caterpillar-identifier/id1642311954)

Instantly identify caterpillars from photos with high accuracy using a large database. Subscribe for full access to this identification tool. Cancel anytime.

**Highlights:** Instant photo processing, High accuracy identification, Extensive caterpillar database, Subscription for full access, Cancel anytime subscription

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Caterpillar ID Full Access | $9.99 | per month |


### Project Monarch Science

[App page](https://appshunter.io/ios/app/project-monarch-science/id6460006970)

This app transforms your smartphone into a receiver for tiny tracking devices attached to monarch butterflies. By crowdsourcing data, it helps scientists monitor butterfly migration patterns in unprecedented detail, aiding conservation efforts.

**Highlights:** Crowdsourced tracking network, Monarch butterfly migration monitoring, Detailed movement data, Habitat conservation insights, Utilizes Bluetooth frequency, Citizen science participation

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

**In-app purchases:** none


## Frequently asked questions

### Is Caterpillar Identifier free?

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

### Is Project Monarch Science free?

Project Monarch Science is free to download, with no in-app purchases.

### Which has better reviews, Caterpillar Identifier or Project Monarch Science?

Project Monarch Science is rated higher. Caterpillar Identifier averages 2.6 out of 5 from 9 ratings, while Project Monarch Science averages 4.0 from 28 ratings.

### Do Caterpillar Identifier or Project Monarch Science have ads?

Neither Caterpillar Identifier nor Project Monarch Science shows ads.

### Which is updated more often, Caterpillar Identifier or Project Monarch Science?

Caterpillar Identifier ships an update every 2 months, and Project Monarch Science every 10 days. Most recently, Caterpillar Identifier was updated on October 23, 2026 and Project Monarch Science on October 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.*