# SigiCalc vs Unit Circle Calculator PRO

The clearest difference is review sentiment: Unit Circle Calculator PRO at 100% against SigiCalc's 50%. Unit Circle Calculator PRO also leads on update cadence (monthly vs every 48 months) and ratings volume (25 vs 1). SigiCalc's advantage is price (Free vs $1.99) and rating (5.0 vs 4.7). On ads, in-app purchases and device support there is nothing between them.

SigiCalc is free to download; Unit Circle Calculator PRO costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

SigiCalc holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Unit Circle Calculator PRO has 25 ratings behind it against 1, so its average is the more settled of the two. Written reviews complicate that: 50% of SigiCalc's written reviews are positive against 100% of Unit Circle Calculator PRO's, so the app with the better star average is not the one people write more warmly about.

SigiCalc ships an update every 48 months, Unit Circle Calculator PRO monthly. The most recent releases landed on September 3, 2026 and August 30, 2026 respectively.

## The numbers

| Metric | SigiCalc | Unit Circle Calculator PRO |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/sigicalc/id522503444/reviews)** | [4.7 (25 ratings)](https://appshunter.io/ios/app/unit-circle-calculator-pro/id1606376541/reviews) |
| Number of ratings | 1 | **25** |
| Positive reviews | 50.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 48 months | **Monthly** |
| Monetization | **Free** | Paid |
| Size | 3 MB | 181 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Siegware](https://appshunter.io/developer/443908611) | [Glindemann, Sennoun, Langer GbR](https://appshunter.io/developer/1024972809) |

## 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


### Unit Circle Calculator PRO

[App page](https://appshunter.io/ios/app/unit-circle-calculator-pro/id1606376541)

Visualize and understand the unit circle with step-by-step calculations, diagrams, and animations. Supports various input formats including negative values, decimals, fractions, and pi. Save, share, and revisit past calculations.

**Highlights:** Unit circle visualization, Step-by-step calculation, Diagrams and animations, Supports negative values, decimals, fractions, and π, Calculation history, Shareable solutions

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

**In-app purchases:** none


## Frequently asked questions

### Is SigiCalc free?

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

### Is Unit Circle Calculator PRO free?

Unit Circle Calculator PRO costs $1.99, with no in-app purchases.

### Which has better reviews, SigiCalc or Unit Circle Calculator PRO?

SigiCalc is rated higher. SigiCalc averages 5.0 out of 5 from 1 ratings, while Unit Circle Calculator PRO averages 4.7 from 25 ratings.

### Do SigiCalc or Unit Circle Calculator PRO have ads?

Neither SigiCalc nor Unit Circle Calculator PRO shows ads.

### Which is updated more often, SigiCalc or Unit Circle Calculator PRO?

SigiCalc ships an update every 48 months, and Unit Circle Calculator PRO monthly. Most recently, SigiCalc was updated on September 3, 2026 and Unit Circle Calculator PRO on August 30, 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.*