PiSquared vs BZSt IBAN+
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
PiSquared
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PiSquared is an RPN-only calculator for the Apple Watch. It supports a wide variety of mathematical and scientific functions as well as binary operations for programmers. Integer, floating point (real) and complex numbers are equally supported. These functions are available: - calculation of the number of combinations or permutations for integer numbers - factorials for integer numbers or Gamma function for positive non-integer numbers - trigonometric, logarithmic, exponential and hyperbolic functions for floating point and complex numbers - date and time conversions - logical operations for binary, octal or hexadecimal numbers - cartesian to polar coordinate conversions and vice versa (floating point numbers) - degrees to radians and vice versa conversions (floating point numbers) - absolute, integer and fractional value of a number (floating point and partially complex numbers) - rounding of a real number (standard rounding and rounding up or down) - random number generator and some more. The calculator has a stack depth of ten and features ten additional storage registers. All storage registers and the stack can be inspected. The stack itself can be manipulated by moving it up or down or by swapping its two topmost elements.
BZSt IBAN+
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.
- Submit IBAN for payments
- Query stored IBAN
- Delete stored IBAN
- Track IBAN submission status
- Set personal PIN for login
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Via the app βBZSt IBAN+β, you can easily and securely submit your IBAN to the Federal Central Tax Office (BZSt). To use this service, you will need either a BundID account or an ELSTER certificate. What does the βBZSt IBAN+β app offer? - Transmit IBAN: Transmit your IBAN to the BZSt now in order to enable future non-cash disbursement of public funds. - Query IBAN: Query your stored IBAN. - Delete IBAN: Delete your stored IBAN. - Stay informed: Access all information on the processing status of your IBAN submission directly within the app. - Convenient login: Set up a personal PIN to simplify your login process in the future.
Screenshots
Verdict
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.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
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.
| Parameter | PiSquared | BZSt IBAN+ |
|---|---|---|
| Price | $1.99 | Free β better |
| Positive reviews | β | 44.4% of reviews |
| Update frequency | Every 23 months | Every 3 months β better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | β | Free |
| Best chart rank | #183 β better | β |
| Devices | iPhone, iPod, Apple Watch β better | iPhone, iPod |
| Requires iOS | 13.0 β better | 15.1 |
| Further details β not scored | ||
| Size | 3 MB | 39 MB |
| Age rating | 4+ | 4+ |
| Developer | Hartwig Wiesmann | Bundeszentralamt fΓΌr Steuern |
In-app purchases
PiSquared
No in-app purchases
BZSt IBAN+
No in-app purchases









