# FunctionCalc vs Calculator + AR Ruler BLACK #1

The clearest difference is price: Calculator + AR Ruler BLACK #1 at Free against FunctionCalc's $0.99. Calculator + AR Ruler BLACK #1 also leads on iOS requirement (13.0 vs 26.2). FunctionCalc's advantage is in-app purchases (none vs 1). On rating, review sentiment, ratings volume and update cadence there is nothing between them.

Calculator + AR Ruler BLACK #1 is free to download; FunctionCalc costs $0.99 up front. Calculator + AR Ruler BLACK #1 sells 1 one-off in-app purchase. FunctionCalc asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for FunctionCalc against 5.0 for Calculator + AR Ruler BLACK #1. Both are backed by a comparable volume of ratings — 13 and 19 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

FunctionCalc ships an update every 8 days, Calculator + AR Ruler BLACK #1 every 9 days. The most recent releases landed on October 10, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | FunctionCalc | Calculator + AR Ruler BLACK #1 |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | [5.0 (13 ratings)](https://appshunter.io/ios/app/functioncalc/id1455028714/reviews) | [5.0 (19 ratings)](https://appshunter.io/ios/app/calculator-plus-ar-ruler-black-1/id6443492349/reviews) |
| Number of ratings | 13 | **19** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 8 days** | Every 9 days |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 2 MB | 15 MB |
| Requires iOS | 26.2 | **13.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Lawler Innovations, Inc](https://appshunter.io/developer/1455028713) | [DIGIID LLC](https://appshunter.io/developer/1051432431) |

## What reviewers say

### FunctionCalc

[App page](https://appshunter.io/ios/app/functioncalc/id1455028714)

This all-in-one utility app helps veterans calculate VA disability benefits, track important dates, and perform everyday calculations. It includes a tip splitter, unit converter, and a powerful calculator with saved formulas.

**Highlights:** VA disability benefit calculator, Date countdown and elapsed time tracker, Tip calculator and bill splitting, Unit and currency converter, Time math and custom formulas, Full calculation history

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

**In-app purchases:** none


### Calculator + AR Ruler BLACK #1

[App page](https://appshunter.io/ios/app/calculator-plus-ar-ruler-black-1/id6443492349)

This utility app combines a standard calculator with an augmented reality ruler. Measure lengths by tapping points on your screen and instantly convert units. Perform calculations on surface area or other metrics using the integrated calculator.

**Highlights:** Augmented reality measuring ruler, Basic mathematical functions, Multiple unit conversion, Tap to measure length, Integrated calculator for surface area

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Platinum VIP Membership | $999.99 | one-time |


## Frequently asked questions

### Is FunctionCalc free?

FunctionCalc costs $0.99, with no in-app purchases.

### Is Calculator + AR Ruler BLACK #1 free?

Calculator + AR Ruler BLACK #1 is free to download, with in-app purchases available.

### Which has better reviews, FunctionCalc or Calculator + AR Ruler BLACK #1?

FunctionCalc and Calculator + AR Ruler BLACK #1 are both rated 5.0 out of 5 on the App Store, from 13 and 19 ratings respectively.

### Do FunctionCalc or Calculator + AR Ruler BLACK #1 have ads?

Neither FunctionCalc nor Calculator + AR Ruler BLACK #1 shows ads.

### Which is updated more often, FunctionCalc or Calculator + AR Ruler BLACK #1?

FunctionCalc ships an update every 8 days, and Calculator + AR Ruler BLACK #1 every 9 days. Most recently, FunctionCalc was updated on October 10, 2026 and Calculator + AR Ruler BLACK #1 on October 16, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*