# Interval Task Tracker vs 解方程计算器

The clearest difference is price: 解方程计算器 at Free against Interval Task Tracker's $1.99. 解方程计算器 also leads on update cadence (every 3 months vs every 8 months). Interval Task Tracker's advantage is in-app purchases (none vs 4). On ads, device support and iOS requirement there is nothing between them.

解方程计算器 is free to download; Interval Task Tracker costs $1.99 up front. 解方程计算器 sells 4 one-off in-app purchases. Interval Task Tracker asks for nothing beyond the download.

Interval Task Tracker ships an update every 8 months, 解方程计算器 every 3 months. The most recent releases landed on May 18, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | Interval Task Tracker | 解方程计算器 |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | — | **[3.9 (14 ratings)](https://appshunter.io/ios/app/id1512344352/reviews)** |
| Number of ratings | — | **14** |
| Positive reviews | — | 16.7% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 3 months** |
| Size | 8 MB | 28 MB |
| Requires iOS | 12.0 | **11.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Seiji Ura](https://appshunter.io/developer/1358595888) | [轶劼 薛](https://appshunter.io/developer/1509014172) |

## What reviewers say

### Interval Task Tracker

[App page](https://appshunter.io/ios/app/interval-task-tracker/id1398939684)

**Features:** macOS Compatibility

**In-app purchases:** none


### 解方程计算器

[App page](https://appshunter.io/ios/app/id1512344352)

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 一个月 | $0.99 | one-time |
| 三个月 | $2.00 | one-time |
| 6个月 | $4.00 | one-time |
| 永久解锁 | $7.99 | one-time |


## Frequently asked questions

### Is Interval Task Tracker free?

Interval Task Tracker costs $1.99, with no in-app purchases.

### Is 解方程计算器 free?

解方程计算器 is free to download, with in-app purchases available.

### Do Interval Task Tracker or 解方程计算器 have ads?

Neither Interval Task Tracker nor 解方程计算器 shows ads.

### Which is updated more often, Interval Task Tracker or 解方程计算器?

Interval Task Tracker ships an update every 8 months, and 解方程计算器 every 3 months. Most recently, Interval Task Tracker was updated on May 18, 2026 and 解方程计算器 on October 17, 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.*