# Harmony vs Certezia

The clearest difference is in-app purchases: Harmony at none against Certezia's 1. Certezia's advantage is update cadence (every 2 weeks vs every 3 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Certezia sells 1 in-app purchase, starting at $3.99 per year. Harmony asks for nothing beyond the download.

Harmony ships an update every 3 months, Certezia every 2 weeks. The most recent releases landed on October 11, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | Harmony | Certezia |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/certezia/id6756247213/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 weeks** |
| Monetization | — | Free |
| Size | 2 MB | 112 MB |
| Requires iOS | 16.6 | **16.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 17+ |
| Developer | [Assetec](https://appshunter.io/developer/1422887931) | [Certezia EIRL](https://appshunter.io/developer/1859511027) |

## What reviewers say

### Harmony

[App page](https://appshunter.io/ios/app/harmony/id1434562311)

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

**In-app purchases:** none


### Certezia

[App page](https://appshunter.io/ios/app/certezia/id6756247213)

Digitally sign documents securely and legally in Peru using your electronic National Identity Document (DNIe) and NFC technology. This app allows for quick and easy signing directly from your smartphone, eliminating the need for extra hardware or certificates.

**Highlights:** Digital document signing, Utilizes DNIe and NFC, Smartphone signing, Legal compliance in Peru, No USB readers or extra certificates needed

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Firma Personal Premium | $3.99 | per year |


## Frequently asked questions

### Is Harmony free?

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

### Is Certezia free?

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

### Do Harmony or Certezia have ads?

Neither Harmony nor Certezia shows ads.

### Which is updated more often, Harmony or Certezia?

Harmony ships an update every 3 months, and Certezia every 2 weeks. Most recently, Harmony was updated on October 11, 2026 and Certezia on October 4, 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.*