# Bird ID vs Grade Tests | Corrigi

The clearest difference is in-app purchases: Grade Tests | Corrigi at none against Bird ID's 9. Grade Tests | Corrigi also leads on update cadence (every 6 days vs fortnightly). Bird ID's advantage is device support (3 vs 1). On price, ads and iOS requirement there is nothing between them.

Both are free to download. Bird ID sells 7 in-app purchases, starting at $6.99 per month. Grade Tests | Corrigi asks for nothing beyond the download.

Bird ID ships an update fortnightly, Grade Tests | Corrigi every 6 days. The most recent releases landed on October 15, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | Bird ID | Grade Tests | Corrigi |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (91 ratings)](https://appshunter.io/ios/app/bird-id/id1450002184/reviews)** | — |
| Number of ratings | **91** | — |
| Positive reviews | 28.9% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 6 days** |
| Monetization | Free with in-app purchases | — |
| Size | 109 MB | 19 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [VaultID](https://appshunter.io/developer/1411398300) | [Robotimize Ltda](https://appshunter.io/developer/397681247) |

## What reviewers say

### Bird ID

[App page](https://appshunter.io/ios/app/bird-id/id1450002184)

This app provides a secure cloud-based digital certificate for signing documents with legal validity. It offers enhanced security features, transaction history, and device management for a convenient digital experience.

**Highlights:** Sign documents with legal validity, Cloud-based digital certificate, Secure OTP generation, Manage Bird ID accounts, View connected devices, Transaction history tracking, Purchase credits in-app

**Features:** Vision Pro support

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Mensal | $6.99 | per month |
| Plano Padrão | $6.99 | per month |
| Anual | $29.99 | per year |
| Plano Padrão | $29.99 | per year |
| 1 mês | $9.99 | one-time |
| 3 meses | $17.99 | one-time |
| 1 ano | $29.99 | one-time |


### Grade Tests | Corrigi

[App page](https://appshunter.io/ios/app/grade-tests-corrigi/id6771878747)

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

**In-app purchases:** none


## Frequently asked questions

### Is Bird ID free?

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

### Is Grade Tests | Corrigi free?

Grade Tests | Corrigi is free to download, with no in-app purchases.

### Do Bird ID or Grade Tests | Corrigi have ads?

Neither Bird ID nor Grade Tests | Corrigi shows ads.

### Which is updated more often, Bird ID or Grade Tests | Corrigi?

Bird ID ships an update fortnightly, and Grade Tests | Corrigi every 6 days. Most recently, Bird ID was updated on October 15, 2026 and Grade Tests | Corrigi on October 1, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*