# Converter One vs Future Letter

The clearest difference is price: Future Letter at Free against Converter One's $0.99. Future Letter also leads on update cadence (monthly vs every 6 months) and iOS requirement (13.0 vs 17.6). Converter One's advantage is in-app purchases (none vs 3). On ads and device support there is nothing between them.

Future Letter is free to download; Converter One costs $0.99 up front. Future Letter sells 3 one-off in-app purchases. Converter One asks for nothing beyond the download.

Converter One ships an update every 6 months, Future Letter monthly. The most recent releases landed on October 30, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Converter One | Future Letter |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 months | **Monthly** |
| Size | 10 MB | 50 MB |
| Requires iOS | 17.6 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Ashkan Zanjani](https://appshunter.io/developer/1501855480) | [锡球 刘](https://appshunter.io/developer/1886999777) |

## What reviewers say

### Converter One

[App page](https://appshunter.io/ios/app/converter-one/id6753948436)

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

**In-app purchases:** none


### Future Letter

[App page](https://appshunter.io/ios/app/future-letter-time-capsule/id6789511794)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Recharge 5 Points | $0.99 | one-time |
| Recharge 18 Points | $2.99 | one-time |
| Recharge 50 Points | $7.99 | one-time |


## Frequently asked questions

### Is Converter One free?

Converter One costs $0.99, with no in-app purchases.

### Is Future Letter free?

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

### Do Converter One or Future Letter have ads?

Neither Converter One nor Future Letter shows ads.

### Which is updated more often, Converter One or Future Letter?

Converter One ships an update every 6 months, and Future Letter monthly. Most recently, Converter One was updated on October 30, 2026 and Future Letter on October 25, 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.*