# PDFW·电子签名 vs CardBal

The clearest difference is in-app purchases: CardBal at none against PDFW·电子签名's 1. PDFW·电子签名's advantage is device support (3 vs 1). On price, update cadence, ads and iOS requirement there is nothing between them.

Both are free to download. PDFW·电子签名 sells 1 one-off in-app purchase. CardBal asks for nothing beyond the download.

PDFW·电子签名 ships an update every 3 weeks, CardBal every 2 weeks. The most recent releases landed on October 30, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | PDFW·电子签名 | CardBal |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 2 weeks** |
| Size | 3 MB | 51 MB |
| Requires iOS | **15.6** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [上海寻程网络科技有限公司](https://appshunter.io/developer/1500716476) | [Kitta Co.](https://appshunter.io/developer/1896674871) |

## What reviewers say

### PDFW·电子签名

[App page](https://appshunter.io/ios/app/pdfw/id6756837676)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 解锁完整功能 | $29.99 | one-time |


### CardBal

[App page](https://appshunter.io/ios/app/cardbal-transit-card-reader/id6760978958)

**In-app purchases:** none


## Frequently asked questions

### Is PDFW·电子签名 free?

PDFW·电子签名 is free to download, with in-app purchases available.

### Is CardBal free?

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

### Do PDFW·电子签名 or CardBal have ads?

Neither PDFW·电子签名 nor CardBal shows ads.

### Which is updated more often, PDFW·电子签名 or CardBal?

PDFW·电子签名 ships an update every 3 weeks, and CardBal every 2 weeks. Most recently, PDFW·电子签名 was updated on October 30, 2026 and CardBal on October 25, 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.*