# SigiCalc vs StackCalc Calculator

The clearest difference is update cadence: StackCalc Calculator at every 2 months against SigiCalc's every 48 months. On price, ads, in-app purchases and device support there is nothing between them.

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

SigiCalc ships an update every 48 months, StackCalc Calculator every 2 months. The most recent releases landed on November 1, 2026 and November 10, 2026 respectively.

## The numbers

| Metric | SigiCalc | StackCalc Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/sigicalc/id522503444/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 48 months | **Every 2 months** |
| Monetization | Free | — |
| Size | 3 MB | 102 MB |
| Requires iOS | 17.0 | **16.0** |
| Devices | iPhone, iPad | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Siegware](https://appshunter.io/developer/443908611) | [Abraham Bagherjeiran](https://appshunter.io/developer/1513861366) |

## What reviewers say

### SigiCalc

[App page](https://appshunter.io/ios/app/sigicalc/id522503444)

This app provides a graphical RPN calculator with an undo feature. Users can input mathematical equations and instantly visualize them with a plot. It's designed for simplicity and practicality in mathematical calculations.

**Highlights:** Graphical RPN calculator, Equation plotting, Undo functionality, Simple interface, Practical calculations

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

**In-app purchases:** none


### StackCalc Calculator

[App page](https://appshunter.io/ios/app/stackcalc-calculator/id6801788040)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is SigiCalc free?

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

### Is StackCalc Calculator free?

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

### Do SigiCalc or StackCalc Calculator have ads?

Neither SigiCalc nor StackCalc Calculator shows ads.

### Which is updated more often, SigiCalc or StackCalc Calculator?

SigiCalc ships an update every 48 months, and StackCalc Calculator every 2 months. Most recently, SigiCalc was updated on November 1, 2026 and StackCalc Calculator on November 10, 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.*