# MailToFuture vs Keepstone

The clearest difference is update cadence: MailToFuture at every 2 days against Keepstone's every 6 days. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. MailToFuture sells 10 one-off in-app purchases and Keepstone sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

MailToFuture ships an update every 2 days, Keepstone every 6 days. The most recent releases landed on September 13, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | MailToFuture | Keepstone |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 2 days** | Every 6 days |
| Size | 111 MB | 18 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Tunahan Cetinkaya](https://appshunter.io/developer/1839662313) | [Pablo Silva](https://appshunter.io/developer/1876877015) |

## What reviewers say

### MailToFuture

[App page](https://appshunter.io/ios/app/mailtofuture/id6757543281)

**Features:** macOS Compatibility

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Short Term Capsule | $2.99 | one-time |
| Mid Term Capsule | $4.99 | one-time |
| Long Term Capsule | $6.99 | one-time |
| 5× Short Term Pack | $7.99 | one-time |
| Horizon Capsule | $8.99 | one-time |
| Starter Pack | $9.99 | one-time |
| Milestone Capsule | $11.99 | one-time |
| Life Pack | $11.99 | one-time |
| Love Pack | $13.99 | one-time |
| Legacy Capsule | $14.99 | one-time |


### 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 |


## Frequently asked questions

### Is MailToFuture free?

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

### Is Keepstone free?

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

### Do MailToFuture or Keepstone have ads?

Neither MailToFuture nor Keepstone shows ads.

### Which is updated more often, MailToFuture or Keepstone?

MailToFuture ships an update every 2 days, and Keepstone every 6 days. Most recently, MailToFuture was updated on September 13, 2026 and Keepstone on September 22, 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.*