# SigiCalc vs GT Graph

The clearest difference is in-app purchases: SigiCalc at none against GT Graph's 1. GT Graph's advantage is update cadence (every 8 days vs every 48 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. GT Graph sells 1 one-off in-app purchase. SigiCalc asks for nothing beyond the download.

SigiCalc ships an update every 48 months, GT Graph every 8 days. The most recent releases landed on October 13, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | SigiCalc | GT Graph |
| --- | --- | --- |
| 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** | Yes |
| Ads | No | No |
| Update frequency | Every 48 months | **Every 8 days** |
| Monetization | Free | — |
| Size | 3 MB | 1 MB |
| Requires iOS | **17.0** | 18.0 |
| Devices | iPhone, iPad | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Siegware](https://appshunter.io/developer/443908611) | [Gennaro Eduardo Tangari](https://appshunter.io/developer/1616502345) |

## 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


### GT Graph

[App page](https://appshunter.io/ios/app/gt-graph/id6757393417)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| GT Graph In-App Purchase | $0.99 | one-time |


## Frequently asked questions

### Is SigiCalc free?

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

### Is GT Graph free?

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

### Do SigiCalc or GT Graph have ads?

Neither SigiCalc nor GT Graph shows ads.

### Which is updated more often, SigiCalc or GT Graph?

SigiCalc ships an update every 48 months, and GT Graph every 8 days. Most recently, SigiCalc was updated on October 13, 2026 and GT Graph on October 8, 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.*