# Birdathon vs Kotlin Programming Compiler

Birdathon and Kotlin Programming Compiler both sit at 4.7 stars, but that hides the real split: 100% of Birdathon's written reviews are positive against 63% of Kotlin Programming Compiler's. Birdathon also leads on ads (none vs shown) and monetization model (free vs free with in-app purchases). Kotlin Programming Compiler's advantage is iOS requirement (12.0 vs 16.1). On price, rating, ratings volume and update cadence there is nothing between them.

Both are free to download. Birdathon sells 4 one-off in-app purchases and Kotlin Programming Compiler sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 4.7 for Birdathon against 4.6 for Kotlin Programming Compiler. Both are backed by a comparable volume of ratings — 15 and 7 respectively. Written reviews are what separate them: 100% of Birdathon's written reviews are positive against 63% of Kotlin Programming Compiler's.

Birdathon ships an update every 4 months, Kotlin Programming Compiler every 2 months. The most recent releases landed on September 19, 2026 and August 16, 2026 respectively.

## The numbers

| Metric | Birdathon | Kotlin Programming Compiler |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (15 ratings)](https://appshunter.io/ios/app/birdathon/id1211977440/reviews)** | [4.6 (7 ratings)](https://appshunter.io/ios/app/kotlin-programming-compiler/id1450611634/reviews) |
| Number of ratings | **15** | 7 |
| Positive reviews | **100.0% of reviews** | 62.5% of reviews |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 4 months | **Every 2 months** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 192 MB | 20 MB |
| Requires iOS | 16.1 | **12.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Barry Langdon-Lassagne](https://appshunter.io/developer/730758814) | [Ketan Appa](https://appshunter.io/developer/576435759) |

## What reviewers say

### Birdathon

[App page](https://appshunter.io/ios/app/birdathon/id1211977440)

This app helps birdwatchers create and organize detailed checklists of their observations. It automatically records time and location, allowing for easy editing and customization. Users can visualize their sightings on maps, add field notes, and export data for sharing or further analysis.

**Highlights:** Observation-centric checklists, Automatic time and location recording, Customizable maps with boundary overlays, Field notes for additional observations, Multiple checklist sorting options, Data export to CSV and other formats, Create checklist templates

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Good Tip | $0.99 | one-time |
| Great Tip | $1.99 | one-time |
| Amazing Tip | $2.99 | one-time |
| Incredible Tip | $4.99 | one-time |


### Kotlin Programming Compiler

[App page](https://appshunter.io/ios/app/kotlin-programming-compiler/id1450611634)

Write and execute Kotlin code directly on your mobile device. This app is designed for learning and testing code snippets with features like syntax highlighting and a custom keyboard. It allows you to compile, run, and share your Kotlin files.

**Highlights:** Compile and run Kotlin programs, View program output and errors, Custom keyboard for easy input, Advanced source code editor, Syntax highlighting and line numbers, Open, save, import, and share files

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Upgrade | $2.99 | one-time |


## Frequently asked questions

### Is Birdathon free?

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

### Is Kotlin Programming Compiler free?

Kotlin Programming Compiler is free to download, with in-app purchases available.

### Which has better reviews, Birdathon or Kotlin Programming Compiler?

Birdathon is rated higher. Birdathon averages 4.7 out of 5 from 15 ratings, while Kotlin Programming Compiler averages 4.6 from 7 ratings.

### Do Birdathon or Kotlin Programming Compiler have ads?

Kotlin Programming Compiler shows ads; Birdathon does not.

### Which is updated more often, Birdathon or Kotlin Programming Compiler?

Birdathon ships an update every 4 months, and Kotlin Programming Compiler every 2 months. Most recently, Birdathon was updated on September 19, 2026 and Kotlin Programming Compiler on August 16, 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.*