# 13 vs Abacus

The clearest difference is price: 13 at Free against Abacus's $2.99. 13 also leads on update cadence (every 3 months vs every 9 months) and iOS requirement (5.1.1 vs 15.6). Abacus's advantage is in-app purchases (none vs 2) and review sentiment (15% vs 0%). On ads there is nothing between them.

13 is free to download; Abacus costs $2.99 up front. 13 sells 2 one-off in-app purchases. Abacus asks for nothing beyond the download.

13 ships an update every 3 months, Abacus every 9 months. The most recent releases landed on June 5, 2026 and September 4, 2026 respectively.

## The numbers

| Metric | 13 | Abacus |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | **[3.0 (3 ratings)](https://appshunter.io/ios/app/13/id526971511/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 0.0% of reviews | **15.4% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 9 months |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 142 MB | 12 MB |
| Requires iOS | **5.1.1** | 15.6 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Tatiana Churanova](https://appshunter.io/developer/456152397) | [俊 姜](https://appshunter.io/developer/974809005) |

## What reviewers say

### 13

[App page](https://appshunter.io/ios/app/13/id526971511)

A Halloween-themed shape puzzle game designed for young children to learn counting through interactive play. It features intuitive puzzles, animated toys, and mini-games to keep kids engaged while practicing one-to-one correspondence.

**Highlights:** Halloween-themed puzzles, Counting practice with 1-to-1 correspondence, Intuitive shape matching, Animated toys upon completion, Two mini-games: Find the number and Memory cards, Engaging and fun learning experience

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| More Languages | $0.99 | one-time |
| Full Version | $1.99 | one-time |


### Abacus

[App page](https://appshunter.io/ios/app/abacus-dancing-fingers/id1153561673)

This educational app combines ancient calculation wisdom with modern technology. It features a beautiful interface with large beads, supports decimal points and negative numbers, and offers multilingual support for a fun and engaging learning experience.

**Highlights:** Beautiful interface with large beads, Support for decimal points and negative numbers, 21-column abacus, Multilingual support (19 languages), Interactive calculation examples

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

**In-app purchases:** none


## Frequently asked questions

### Is 13 free?

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

### Is Abacus free?

Abacus costs $2.99, with no in-app purchases.

### Do 13 or Abacus have ads?

Neither 13 nor Abacus shows ads.

### Which is updated more often, 13 or Abacus?

13 ships an update every 3 months, and Abacus every 9 months. Most recently, 13 was updated on June 5, 2026 and Abacus on September 4, 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.*