# Xref.AI vs Flember

The clearest difference is iOS requirement: Xref.AI at 13.4 against Flember's 15.1. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Xref.AI sells 1 one-off in-app purchase and Flember sells 6 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | Xref.AI | Flember |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | — | Every 6 weeks |
| Size | 14 MB | 36 MB |
| Requires iOS | **13.4** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Ignite Channel Inc.](https://appshunter.io/developer/1594156436) | [Victor Igor Gomes Martins](https://appshunter.io/developer/1681808416) |

## What reviewers say

### Xref.AI

[App page](https://appshunter.io/ios/app/xrefai/id6736659235)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Buy Credits | $99.99 | one-time |


### Flember

[App page](https://appshunter.io/ios/app/flember-ai-study-guide/id6742158406)

**Features:** macOS Compatibility

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $4.99 | per month |
| Pro Monthly | $14.90 | per month |
| Max Monthly | $24.99 | per month |
| Pro Yearly | $39.99 | per year |
| Pro Yearly | $89.90 | per year |
| Max Yearly | $199.99 | per year |


## Frequently asked questions

### Is Xref.AI free?

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

### Is Flember free?

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

### Do Xref.AI or Flember have ads?

Neither Xref.AI nor Flember 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.*