# PiSquared vs BZSt IBAN+

The clearest difference is price: BZSt IBAN+ at Free against PiSquared's $1.99. BZSt IBAN+ also leads on update cadence (every 3 months vs every 23 months). PiSquared's advantage is chart position (#183 vs unranked) and iOS requirement (13.0 vs 15.1). On ads, in-app purchases and device support there is nothing between them.

BZSt IBAN+ is free to download; PiSquared costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

PiSquared ships an update every 23 months, BZSt IBAN+ every 3 months. The most recent releases landed on October 30, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | PiSquared | BZSt IBAN+ |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Positive reviews | — | 44.4% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 23 months | **Every 3 months** |
| Monetization | — | Free |
| Best chart rank | **#183** | — |
| Size | 3 MB | 39 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | **iPhone, iPod, Apple Watch** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Hartwig Wiesmann](https://appshunter.io/developer/1658877258) | [Bundeszentralamt für Steuern](https://appshunter.io/developer/1829962335) |

## What reviewers say

### PiSquared

[App page](https://appshunter.io/ios/app/pisquared/id1615268645)

**Currently charting:** #183 Top Paid · Productivity (US App Store)

**Features:** Apple Watch app

**In-app purchases:** none


### BZSt IBAN+

[App page](https://appshunter.io/ios/app/bzst-iban-plus/id6749314498)

Securely submit your IBAN to the Federal Central Tax Office (BZSt) for future payments. Manage your IBAN, check its status, and set a personal PIN for easy access. Requires a BundID account or ELSTER certificate.

**Highlights:** Submit IBAN for payments, Query stored IBAN, Delete stored IBAN, Track IBAN submission status, Set personal PIN for login

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

**In-app purchases:** none


## Frequently asked questions

### Is PiSquared free?

PiSquared costs $1.99, with no in-app purchases.

### Is BZSt IBAN+ free?

BZSt IBAN+ is free to download, with no in-app purchases.

### Do PiSquared or BZSt IBAN+ have ads?

Neither PiSquared nor BZSt IBAN+ shows ads.

### Which is updated more often, PiSquared or BZSt IBAN+?

PiSquared ships an update every 23 months, and BZSt IBAN+ every 3 months. Most recently, PiSquared was updated on October 30, 2026 and BZSt IBAN+ on October 24, 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.*