# Keepstone vs Time Letter

The clearest difference is update cadence: Keepstone at every 6 days against Time Letter's monthly. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Keepstone sells 1 one-off in-app purchase and Time Letter sells 4 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

Keepstone ships an update every 6 days, Time Letter monthly. The most recent releases landed on September 22, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | Keepstone | Time Letter |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 6 days** | Monthly |
| Size | 18 MB | 52 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Pablo Silva](https://appshunter.io/developer/1876877015) | [名易 李](https://appshunter.io/developer/1886758085) |

## What reviewers say

### Keepstone

[App page](https://appshunter.io/ios/app/keepstone-time-capsule-diary/id6759112157)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Keepstone Supporter | $0.99 | one-time |


### Time Letter

[App page](https://appshunter.io/ios/app/time-letter/id6761035606)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro - Monthly | $1.99 | per month |
| Max - Monthly | $5.99 | per month |
| Pro - Annual | $14.99 | per year |
| Max - Annual | $34.99 | per year |


## Frequently asked questions

### Is Keepstone free?

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

### Is Time Letter free?

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

### Do Keepstone or Time Letter have ads?

Neither Keepstone nor Time Letter shows ads.

### Which is updated more often, Keepstone or Time Letter?

Keepstone ships an update every 6 days, and Time Letter monthly. Most recently, Keepstone was updated on September 22, 2026 and Time Letter on September 18, 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.*