# iDB2Prog vs 投影计算器

The clearest difference is update cadence: iDB2Prog at every 3 months against 投影计算器's every 30 months. iDB2Prog also leads on iOS requirement (9.0 vs 12.0). 投影计算器's advantage is price ($6.99 vs $9.99). On ads, in-app purchases and device support there is nothing between them.

iDB2Prog costs $9.99 and 投影计算器 $6.99 up front. Neither carries in-app purchases, so what you see is what you pay.

iDB2Prog ships an update every 3 months, 投影计算器 every 30 months. The most recent releases landed on November 1, 2026 and January 4, 2026 respectively.

## The numbers

| Metric | iDB2Prog | 投影计算器 |
| --- | --- | --- |
| Price | $9.99 | **$6.99** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 30 months |
| Size | 16 MB | 2 MB |
| Requires iOS | **9.0** | 12.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Balasubramanian Ramanathan](https://appshunter.io/developer/1497624706) | [方军 杨](https://appshunter.io/developer/1116000525) |

## What reviewers say

### iDB2Prog

[App page](https://appshunter.io/ios/app/idb2prog-db2-database-client/id424887458)

**In-app purchases:** none


### 投影计算器

[App page](https://appshunter.io/ios/app/id1116000526)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is iDB2Prog free?

iDB2Prog costs $9.99, with no in-app purchases.

### Is 投影计算器 free?

投影计算器 costs $6.99, with no in-app purchases.

### Do iDB2Prog or 投影计算器 have ads?

Neither iDB2Prog nor 投影计算器 shows ads.

### Which is updated more often, iDB2Prog or 投影计算器?

iDB2Prog ships an update every 3 months, and 投影计算器 every 30 months. Most recently, iDB2Prog was updated on November 1, 2026 and 投影计算器 on January 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.*