# SerproID vs Nano Key

SerproID and Nano Key are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on September 21, 2026 and May 16, 2026 respectively.

## The numbers

| Metric | SerproID | Nano Key |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (180 ratings)](https://appshunter.io/ios/app/serproid/id1218969864/reviews)** | — |
| Number of ratings | **180** | — |
| Positive reviews | 48.3% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | Free | — |
| Size | 16 MB | 61 MB |
| Requires iOS | 15.6 | **14.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | +4 | 4+ |
| Developer | [Servico Federal de Processamento de Dados (SERPRO)](https://appshunter.io/developer/529883044) | [Promont Solucoes Ltda](https://appshunter.io/developer/1450762911) |

## What reviewers say

### SerproID

[App page](https://appshunter.io/ios/app/serproid/id1218969864)

Utilize certificados digitais ICP-Brasil em dispositivos móveis com segurança e alta disponibilidade. Autentique-se e assine documentos eletrônicos com validade jurídica de qualquer lugar, sem a necessidade de dispositivos físicos.

**Highlights:** Mobile ICP-Brasil digital certificate use, Electronic authentication, Digital signatures, Action history tracking, Device and station management

**In-app purchases:** none


### Nano Key

[App page](https://appshunter.io/ios/app/nano-key/id1495821408)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is SerproID free?

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

### Is Nano Key free?

Nano Key is free to download, with no in-app purchases.

### Do SerproID or Nano Key have ads?

Neither SerproID nor Nano Key shows ads.

### Which is updated more often, SerproID or Nano Key?

SerproID ships an update every 2 months, and Nano Key every 2 months. Most recently, SerproID was updated on September 21, 2026 and Nano Key on May 16, 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.*