# Isoelectric Point vs Birdathon

The clearest difference is price: Birdathon at Free against Isoelectric Point's $2.99. On update cadence, ads, in-app purchases and device support there is nothing between them.

Birdathon is free to download; Isoelectric Point costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Both ship on a similar rhythm, roughly every 4 months. The most recent releases landed on November 1, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | Isoelectric Point | Birdathon |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | — | **[4.7 (15 ratings)](https://appshunter.io/ios/app/birdathon/id1211977440/reviews)** |
| Number of ratings | — | **15** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | Every 4 months |
| Monetization | — | Free |
| Size | 3 MB | 192 MB |
| Requires iOS | **15.3** | 16.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Roman Volinsky](https://appshunter.io/developer/977951850) | [Barry Langdon-Lassagne](https://appshunter.io/developer/730758814) |

## What reviewers say

### Isoelectric Point

[App page](https://appshunter.io/ios/app/isoelectric-point/id1018663238)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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:** none


## Frequently asked questions

### Is Isoelectric Point free?

Isoelectric Point costs $2.99, with no in-app purchases.

### Is Birdathon free?

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

### Do Isoelectric Point or Birdathon have ads?

Neither Isoelectric Point nor Birdathon shows ads.

### Which is updated more often, Isoelectric Point or Birdathon?

Isoelectric Point ships an update every 4 months, and Birdathon every 4 months. Most recently, Isoelectric Point was updated on November 1, 2026 and Birdathon on November 2, 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.*