# Timer99 vs Byeoldosa

The clearest difference is update cadence: Timer99 at every 2 days against Byeoldosa's every 6 months. Timer99 also leads on iOS requirement (13.0 vs 18.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Timer99 ships an update every 2 days, Byeoldosa every 6 months. The most recent releases landed on October 27, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Timer99 | Byeoldosa |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/byeoldosa-arithmetic-practice/id6443646489/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 days** | Every 6 months |
| Monetization | — | Free |
| Size | 8 MB | 10 MB |
| Requires iOS | **13.0** | 18.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Takahashi Naoto](https://appshunter.io/developer/375321356) | [Hyekyung Jeong](https://appshunter.io/developer/1634743217) |

## What reviewers say

### Timer99

[App page](https://appshunter.io/ios/app/timer99/id1501276905)

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

**In-app purchases:** none


### Byeoldosa

[App page](https://appshunter.io/ios/app/byeoldosa-arithmetic-practice/id6443646489)

This app offers step-by-step practice for basic arithmetic operations like addition, subtraction, multiplication, and division. It features levels organized by difficulty, from single-digit to three-digit numbers, with a vertical calculation mode that mimics writing sums on paper. Progress is automatically saved and visualized in charts to track speed and accuracy improvements.

**Highlights:** Step-by-step arithmetic practice, Addition, subtraction, multiplication, division, Difficulty levels, Vertical (column) calculation mode, Automatic practice set saving, Progress charts for speed and accuracy

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Timer99 free?

Timer99 is free to download, with no in-app purchases.

### Is Byeoldosa free?

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

### Do Timer99 or Byeoldosa have ads?

Neither Timer99 nor Byeoldosa shows ads.

### Which is updated more often, Timer99 or Byeoldosa?

Timer99 ships an update every 2 days, and Byeoldosa every 6 months. Most recently, Timer99 was updated on October 27, 2026 and Byeoldosa on November 3, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*