# Letter Explainer vs Optivolt

The clearest difference is iOS requirement: Letter Explainer at 17.0 against Optivolt's 26.0. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Letter Explainer sells 3 in-app purchases, starting at $3.99 per month and Optivolt sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | Letter Explainer | Optivolt |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 5 days | — |
| Size | 22 MB | 2 MB |
| Requires iOS | **17.0** | 26.0 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Armen Ter-Oganezov](https://appshunter.io/developer/1723150483) | [Stefano Ferrario](https://appshunter.io/developer/6822181285) |

## What reviewers say

### Letter Explainer

[App page](https://appshunter.io/ios/app/letter-explainer-postklar/id6816644992)

**Features:** Family Sharing

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Postklar Pro Monthly | $3.99 | per month |
| Postklar Pro Yearly | $24.99 | per year |
| 5 Scans | $2.99 | one-time |


### Optivolt

[App page](https://appshunter.io/ios/app/optivolt-smart-ev-charging/id6822181283)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Optivolt Pro | $2.99 | one-time |


## Frequently asked questions

### Is Letter Explainer free?

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

### Is Optivolt free?

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

### Do Letter Explainer or Optivolt have ads?

Neither Letter Explainer nor Optivolt shows ads.

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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.*