# Keyinvoice App vs NOS FOLLOW PRO

The clearest difference is update cadence: Keyinvoice App at every 6 weeks against NOS FOLLOW PRO's every 3 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Keyinvoice App ships an update every 6 weeks, NOS FOLLOW PRO every 3 months. The most recent releases landed on November 1, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Keyinvoice App | NOS FOLLOW PRO |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 6 weeks** | Every 3 months |
| Size | 14 MB | 149 MB |
| Requires iOS | **15** | 15.5 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [T & T-TELEMATICA E TECNOLOGIAS DE INFORMACAO, UNIPESSOAL, LDA](https://appshunter.io/developer/1523497190) | [NOS Comunicacoes, S.A.](https://appshunter.io/developer/407309684) |

## What reviewers say

### Keyinvoice App

[App page](https://appshunter.io/ios/app/keyinvoice-app/id981507076)

**Features:** macOS Compatibility

**In-app purchases:** none


### NOS FOLLOW PRO

[App page](https://appshunter.io/ios/app/nos-follow-pro/id1364908141)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Keyinvoice App free?

Keyinvoice App is free to download, with no in-app purchases.

### Is NOS FOLLOW PRO free?

NOS FOLLOW PRO is free to download, with no in-app purchases.

### Do Keyinvoice App or NOS FOLLOW PRO have ads?

Neither Keyinvoice App nor NOS FOLLOW PRO shows ads.

### Which is updated more often, Keyinvoice App or NOS FOLLOW PRO?

Keyinvoice App ships an update every 6 weeks, and NOS FOLLOW PRO every 3 months. Most recently, Keyinvoice App was updated on November 1, 2026 and NOS FOLLOW PRO 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.*