# Birdathon vs Science Calc

The clearest difference is in-app purchases: Science Calc at none against Birdathon's 4. Science Calc also leads on update cadence (every 5 days vs every 4 months) and rating (5.0 vs 4.7). Birdathon's advantage is ratings volume (15 vs 3). On price, ads, monetization model and device support there is nothing between them.

Both are free to download. Birdathon sells 4 one-off in-app purchases. Science Calc asks for nothing beyond the download.

Science Calc holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Birdathon has 15 ratings behind it against 3, so its average is the more settled of the two.

Birdathon ships an update every 4 months, Science Calc every 5 days. The most recent releases landed on September 19, 2026 and June 3, 2026 respectively.

## The numbers

| Metric | Birdathon | Science Calc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (15 ratings)](https://appshunter.io/ios/app/birdathon/id1211977440/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/science-calc/id1620799327/reviews)** |
| Number of ratings | **15** | 3 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 5 days** |
| Monetization | Free | Free |
| Size | 192 MB | 1 MB |
| Requires iOS | 16.1 | **15.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Barry Langdon-Lassagne](https://appshunter.io/developer/730758814) | [Luke Drushell](https://appshunter.io/developer/1565902401) |

## 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 |


### Science Calc

[App page](https://appshunter.io/ios/app/science-calc/id1620799327)

This app simplifies complex science calculations with handy formulas and simulations. It offers features like wavelength, frequency, and velocity calculations, plus a nuclear bomb blast radius simulator. Enjoy a dark mode for late-night study sessions.

**Highlights:** Wavelength, Frequency, Velocity Calculator, Nuclear Bomb Blast Radius Simulator, Half Life Computation, Atomic Mass Calculation, Volume and Surface Area Calculator, Logarithm Equation Solver, Dark Mode

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Birdathon free?

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

### Is Science Calc free?

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

### Which has better reviews, Birdathon or Science Calc?

Science Calc is rated higher. Birdathon averages 4.7 out of 5 from 15 ratings, while Science Calc averages 5.0 from 3 ratings.

### Do Birdathon or Science Calc have ads?

Neither Birdathon nor Science Calc shows ads.

### Which is updated more often, Birdathon or Science Calc?

Birdathon ships an update every 4 months, and Science Calc every 5 days. Most recently, Birdathon was updated on September 19, 2026 and Science Calc on June 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.*