# Birdathon vs GRE Math Calculator 2025

The clearest difference is in-app purchases: Birdathon at none against GRE Math Calculator 2025's 2. Birdathon also leads on ads (none vs shown) and rating (4.7 vs 4.4). GRE Math Calculator 2025's advantage is update cadence (every 8 days vs every 4 months) and iOS requirement (12.0 vs 16.1). On price and device support there is nothing between them.

Both are free to download. GRE Math Calculator 2025 sells 2 in-app purchases, starting at $4.99 per month. Birdathon asks for nothing beyond the download.

Birdathon holds the better App Store score, 4.7 against 4.4. Both are backed by a comparable volume of ratings — 15 and 5 respectively.

Birdathon ships an update every 4 months, GRE Math Calculator 2025 every 8 days. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Birdathon | GRE Math Calculator 2025 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (15 ratings)](https://appshunter.io/ios/app/birdathon/id1211977440/reviews)** | [4.4 (5 ratings)](https://appshunter.io/ios/app/gre-math-calculator-2025/id1494427060/reviews) |
| Number of ratings | **15** | 5 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 4 months | **Every 8 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 192 MB | 31 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) | [PoChu. Hsu](https://appshunter.io/developer/997180843) |

## 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:** none


### GRE Math Calculator 2025

[App page](https://appshunter.io/ios/app/gre-math-calculator-2025/id1494427060)

This app simulates the official GRE math calculator, offering features like parentheses, memory functions, and a realistic timer. It aims to help users practice calculations with the same behavior as the ETS PowerPrep tool, reducing errors and improving speed.

**Highlights:** Official ETS PowerPrep behavior simulation, Parentheses for faster calculations, Memory functions (M+, MR, MC), Thousands separator, Realistic timer, Transfer Display button

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| AI Tutor | $4.99 | per month |
| Remove Ads | $9.99 | one-time |


## Frequently asked questions

### Is Birdathon free?

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

### Is GRE Math Calculator 2025 free?

GRE Math Calculator 2025 is free to download, with in-app purchases available.

### Which has better reviews, Birdathon or GRE Math Calculator 2025?

Birdathon is rated higher. Birdathon averages 4.7 out of 5 from 15 ratings, while GRE Math Calculator 2025 averages 4.4 from 5 ratings.

### Do Birdathon or GRE Math Calculator 2025 have ads?

GRE Math Calculator 2025 shows ads; Birdathon does not.

### Which is updated more often, Birdathon or GRE Math Calculator 2025?

Birdathon ships an update every 4 months, and GRE Math Calculator 2025 every 8 days. Most recently, Birdathon was updated on November 2, 2026 and GRE Math Calculator 2025 on November 3, 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.*