# Birdathon vs Abacus Lesson

The clearest difference is ads: Birdathon at none against Abacus Lesson's shown. Birdathon also leads on monetization model (free vs free with in-app purchases). Abacus Lesson's advantage is update cadence (every 2 weeks vs every 4 months) and rating (5.0 vs 4.7). On price, review sentiment, ratings volume and in-app purchases there is nothing between them.

Both are free to download. Birdathon sells 4 one-off in-app purchases and Abacus Lesson sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Abacus Lesson holds the better App Store score, 5.0 against 4.7. Both are backed by a comparable volume of ratings — 15 and 14 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

Birdathon ships an update every 4 months, Abacus Lesson every 2 weeks. The most recent releases landed on September 19, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | Birdathon | Abacus Lesson |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (15 ratings)](https://appshunter.io/ios/app/birdathon/id1211977440/reviews) | **[5.0 (14 ratings)](https://appshunter.io/ios/app/abacus-lesson-multiplication/id1582635868/reviews)** |
| Number of ratings | **15** | 14 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 4 months | **Every 2 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 192 MB | 138 MB |
| Requires iOS | 16.1 | **11.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Barry Langdon-Lassagne](https://appshunter.io/developer/730758814) | [Hirokazu Komatsu](https://appshunter.io/developer/1523833531) |

## 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 |


### Abacus Lesson

[App page](https://appshunter.io/ios/app/abacus-lesson-multiplication/id1582635868)

Learn multiplication using a virtual abacus. This app teaches a simple and fast method for calculating multiplication, emphasizing the mental calculation benefits of the abacus over digital calculators.

**Highlights:** Virtual abacus for multiplication, Simple and fast calculation methods, Focus on mental calculation skills, Step-by-step multiplication lessons, Suitable for beginners

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Donation Lv1 for hiding Ad | $1.99 | one-time |
| Donation Lv2 for hiding Ad | $3.99 | one-time |
| Donation Lv3 for hiding Ad | $8.99 | one-time |


## Frequently asked questions

### Is Birdathon free?

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

### Is Abacus Lesson free?

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

### Which has better reviews, Birdathon or Abacus Lesson?

Abacus Lesson is rated higher. Birdathon averages 4.7 out of 5 from 15 ratings, while Abacus Lesson averages 5.0 from 14 ratings.

### Do Birdathon or Abacus Lesson have ads?

Abacus Lesson shows ads; Birdathon does not.

### Which is updated more often, Birdathon or Abacus Lesson?

Birdathon ships an update every 4 months, and Abacus Lesson every 2 weeks. Most recently, Birdathon was updated on September 19, 2026 and Abacus Lesson on September 21, 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.*