# SerproID vs tagCAIXA

The clearest difference is review sentiment: SerproID at 48% against tagCAIXA's 24%. SerproID also leads on ratings volume (180 vs 2) and monetization model (free vs ad-supported). tagCAIXA's advantage is update cadence (every 2 weeks vs every 2 months) and rating (5.0 vs 4.8). On price, ads, in-app purchases and iOS requirement there is nothing between them.

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

tagCAIXA holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: SerproID has 180 ratings behind it against 2, so its average is the more settled of the two. Written reviews complicate that: 48% of SerproID's written reviews are positive against 24% of tagCAIXA's, so the app with the better star average is not the one people write more warmly about.

SerproID ships an update every 2 months, tagCAIXA every 2 weeks. The most recent releases landed on September 28, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | SerproID | tagCAIXA |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (180 ratings)](https://appshunter.io/ios/app/serproid/id1218969864/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/tagcaixa/id1614748846/reviews)** |
| Number of ratings | **180** | 2 |
| Positive reviews | **48.3% of reviews** | 23.8% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Monetization | **Free** | Ad-supported |
| Size | 16 MB | 248 MB |
| Requires iOS | **15.6** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | +4 | +4 |
| Developer | [Servico Federal de Processamento de Dados (SERPRO)](https://appshunter.io/developer/529883044) | [CAIXA CARTOES PRE-PAGOS SA](https://appshunter.io/developer/1610166702) |

## 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


### tagCAIXA

[App page](https://appshunter.io/ios/app/tagcaixa/id1614748846)

This app allows users to make payments at partner locations like toll booths, parking lots, and gas stations without waiting in line. It also helps compare fuel prices, find accepting locations, and track travel expenses.

**Highlights:** Activate tagCAIXA, Compare fuel prices, Find partner locations, Calculate travel costs, Track expenses in real-time, Access invoices and payment slips

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

**In-app purchases:** none


## Frequently asked questions

### Is SerproID free?

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

### Is tagCAIXA free?

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

### Which has better reviews, SerproID or tagCAIXA?

tagCAIXA is rated higher. SerproID averages 4.8 out of 5 from 180 ratings, while tagCAIXA averages 5.0 from 2 ratings.

### Do SerproID or tagCAIXA have ads?

Neither SerproID nor tagCAIXA shows ads.

### Which is updated more often, SerproID or tagCAIXA?

SerproID ships an update every 2 months, and tagCAIXA every 2 weeks. Most recently, SerproID was updated on September 28, 2026 and tagCAIXA on October 1, 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.*