# 闪电短信 vs Second Clock & Countdown

The clearest difference is review sentiment: Second Clock & Countdown at 100% against 闪电短信's 50%. Second Clock & Countdown also leads on rating (5.0 vs 3.7). 闪电短信's advantage is monetization model (free vs freemium) and ratings volume (3 vs 1). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. 闪电短信 sells 3 in-app purchases, starting at $0.99 per month and Second Clock & Countdown sells 3 in-app purchases, starting at $0.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Second Clock & Countdown holds the better App Store score, 5.0 against 3.7. Both are backed by a comparable volume of ratings — 3 and 1 respectively. Written reviews point the same way: 50% of 闪电短信's written reviews are positive against 100% of Second Clock & Countdown's.

闪电短信 ships an update every 11 days, Second Clock & Countdown every 3 weeks. The most recent releases landed on September 7, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | 闪电短信 | Second Clock & Countdown |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.7 (3 ratings)](https://appshunter.io/ios/app/id1624721528/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/second-clock-and-countdown/id6761598609/reviews)** |
| Number of ratings | **3** | 1 |
| Positive reviews | 50.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 11 days** | Every 3 weeks |
| Monetization | **Free** | Freemium |
| Size | 13 MB | 15 MB |
| Requires iOS | **16.0** | 18.0 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Guilin Square Network Technology Co., Ltd.](https://appshunter.io/developer/1624721530) | [旭东 刘](https://appshunter.io/developer/1565635060) |

## What reviewers say

### 闪电短信

[App page](https://appshunter.io/ios/app/id1624721528)

This app uses AI to automatically identify and filter spam, scam, and promotional messages. It offers intelligent categorization, customizable rules, and a privacy-first approach with offline processing.

**Highlights:** AI-powered spam detection, Intelligent SMS categorization, Customizable blocking rules, Offline message processing, Anti-bombing mode, Sample submission for model improvement

**Features:** Family Sharing

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 月度订阅 | $0.99 | per month |
| 年度订阅 | $0.99 | per year |
| 终身版 | $2.99 | one-time |


### Second Clock & Countdown

[App page](https://appshunter.io/ios/app/second-clock-and-countdown/id6761598609)

This utility app provides precise, second-level timekeeping through floating windows, dynamic island integration, and lock screen widgets. It helps users never miss important deadlines, sales, or events with customizable alarms and notifications.

**Highlights:** Floating clock window, Dynamic Island integration, Live Activities display, Lock Screen Widgets, Home Screen Widgets, Alarms and notifications, Personalization options

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $0.99 | per 7 days |
| Yearly | $4.99 | per year |
| Lifetime | $9.99 | one-time |


## Frequently asked questions

### Is 闪电短信 free?

闪电短信 is free to download, with in-app purchases available.

### Is Second Clock & Countdown free?

Second Clock & Countdown is free to download, with in-app purchases available.

### Which has better reviews, 闪电短信 or Second Clock & Countdown?

Second Clock & Countdown is rated higher. 闪电短信 averages 3.7 out of 5 from 3 ratings, while Second Clock & Countdown averages 5.0 from 1 ratings.

### Do 闪电短信 or Second Clock & Countdown have ads?

Neither 闪电短信 nor Second Clock & Countdown shows ads.

### Which is updated more often, 闪电短信 or Second Clock & Countdown?

闪电短信 ships an update every 11 days, and Second Clock & Countdown every 3 weeks. Most recently, 闪电短信 was updated on September 7, 2026 and Second Clock & Countdown on September 21, 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.*