# CoTRAIN vs One Second View

The clearest difference is device support: One Second View at 3 against CoTRAIN's —. On price, in-app purchases and iOS requirement there is nothing between them.

Both are free to download. CoTRAIN sells 2 in-app purchases, starting at $1.99 per month and One Second View sells 3 in-app purchases, starting at $2.90 per month. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | CoTRAIN | One Second View |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | — | No |
| Update frequency | — | Every 4 weeks |
| Size | 90 MB | 49 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | — | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Kazuki Masuda](https://appshunter.io/developer/1871152635) | [CHANG HAO LI](https://appshunter.io/developer/1882627276) |

## What reviewers say

### CoTRAIN

[App page](https://appshunter.io/ios/app/cotrain-ai/id6759483583)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| CoTrain Pro | $1.99 | per month |
| CoTrain Pro 年間プラン | $19.99 | per year |


### One Second View

[App page](https://appshunter.io/ios/app/one-second-view/id6760181098)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| One Second View Pro Monthly | $2.90 | per month |
| Annual Sanctuary (Save 50%) | $22.00 | per year |
| Lifetime Nirvana Access | $56.00 | one-time |


## Frequently asked questions

### Is CoTRAIN free?

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

### Is One Second View free?

One Second View is free to download, with in-app purchases available.

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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.*