# 海纳医学 vs DailyDiff

The clearest difference is update cadence: DailyDiff at every 6 days against 海纳医学's fortnightly. 海纳医学's advantage is iOS requirement (11.0 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. 海纳医学 sells 1 one-off in-app purchase and DailyDiff sells 2 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

海纳医学 ships an update fortnightly, DailyDiff every 6 days. The most recent releases landed on October 26, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | 海纳医学 | DailyDiff |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 6 days** |
| Size | 41 MB | 4 MB |
| Requires iOS | **11.0** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 12+ | 4+ |
| Developer | [IMD Science&Technology Co., Ltd.](https://appshunter.io/developer/990938489) | [LuYang Li](https://appshunter.io/developer/1711364387) |

## What reviewers say

### 海纳医学

[App page](https://appshunter.io/ios/app/id990938490)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 白金会员 | $119.99 | one-time |


### DailyDiff

[App page](https://appshunter.io/ios/app/dailydiff-synonyms-and-nuance/id6780440998)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $1.99 | per month |
| Yearly | $12.99 | per year |


## Frequently asked questions

### Is 海纳医学 free?

海纳医学 is free to download, with in-app purchases available.

### Is DailyDiff free?

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

### Do 海纳医学 or DailyDiff have ads?

Neither 海纳医学 nor DailyDiff shows ads.

### Which is updated more often, 海纳医学 or DailyDiff?

海纳医学 ships an update fortnightly, and DailyDiff every 6 days. Most recently, 海纳医学 was updated on October 26, 2026 and DailyDiff on October 28, 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.*