# SelfSpell vs 瞬息睡眠

The clearest difference is update cadence: SelfSpell at every 8 days against 瞬息睡眠's every 4 weeks. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. SelfSpell sells 1 in-app purchase, starting at $9.99 per year and 瞬息睡眠 sells 2 in-app purchases, starting at $10.99 per month. Whichever you choose, the download price is not the number that matters.

SelfSpell ships an update every 8 days, 瞬息睡眠 every 4 weeks. Both last shipped on October 31, 2026.

## The numbers

| Metric | SelfSpell | 瞬息睡眠 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 8 days** | Every 4 weeks |
| Size | 6 MB | 144 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [泳城 李](https://appshunter.io/developer/1834545350) | [玥 邓](https://appshunter.io/developer/1556261538) |

## What reviewers say

### SelfSpell

[App page](https://appshunter.io/ios/app/selfspell/id6761477429)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SelfSpell Yearly | $9.99 | per year |


### 瞬息睡眠

[App page](https://appshunter.io/ios/app/id6762373331)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Stillnest Monthly | $10.99 | per month |
| Stillnest Annual | $59.99 | per year |


## Frequently asked questions

### Is SelfSpell free?

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

### Is 瞬息睡眠 free?

瞬息睡眠 is free to download, with in-app purchases available.

### Do SelfSpell or 瞬息睡眠 have ads?

Neither SelfSpell nor 瞬息睡眠 shows ads.

### Which is updated more often, SelfSpell or 瞬息睡眠?

SelfSpell ships an update every 8 days, and 瞬息睡眠 every 4 weeks. Most recently, SelfSpell was updated on October 31, 2026 and 瞬息睡眠 on October 31, 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.*