# Sampling Calculator vs Unit Converter A1

The clearest difference is price: Unit Converter A1 at Free against Sampling Calculator's $5.99. Sampling Calculator's advantage is rating (5.0 vs 2.0) and chart position (#173 vs unranked). On ratings volume, update cadence, ads and in-app purchases there is nothing between them.

Unit Converter A1 is free to download; Sampling Calculator costs $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Sampling Calculator holds the better App Store score, 5.0 against 2.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

Sampling Calculator ships an update every 16 months, Unit Converter A1 every 30 months. Both last shipped on September 10, 2026.

## The numbers

| Metric | Sampling Calculator | Unit Converter A1 |
| --- | --- | --- |
| Price | $5.99 | **Free** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/sampling-calculator/id1304811062/reviews)** | [2.0 (1 ratings)](https://appshunter.io/ios/app/unit-converter-a1/id1588554636/reviews) |
| Number of ratings | 1 | 1 |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 16 months** | Every 30 months |
| Monetization | Paid | **Free** |
| Best chart rank | **#173** | — |
| Size | 3 MB | 24 MB |
| Requires iOS | 15.6 | **15.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Juan Manuel Alfredo Sanchez](https://appshunter.io/developer/1304811061) | [Binary And Bricks Pvt Ltd](https://appshunter.io/developer/1587170688) |

## What reviewers say

### Sampling Calculator

[App page](https://appshunter.io/ios/app/sampling-calculator/id1304811062)

**Currently charting:** #173 Top Paid · Productivity (US App Store)

This tool helps calculate sampling plans based on ANSI/ASQ Z1.4 and MIL-STD-105E standards. It supports various sampling size code letters and AQLs for normal, tightened, and reduced inspections. It serves as an aid to understanding and applying these quality control standards.

**Highlights:** ANSI/ASQ Z1.4 2013 compliance, MIL-STD-105E compliance, Single sampling size code letters, Normal, Tightened, and Reduced inspection, AQLs from 0.065 to 15

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

**In-app purchases:** none


### Unit Converter A1

[App page](https://appshunter.io/ios/app/unit-converter-a1/id1588554636)

This application simplifies daily unit conversions with easy-to-use tools. It offers a comprehensive range of conversions across basic, living, and science categories, making calculations accessible to everyone.

**Highlights:** Basic, Living, and Science Converters, Length, Weight, Area, Volume conversions, Temperature, Time, Speed, Fuel conversions, Pressure, Force, Power, Angle conversions, Digital and Frequency conversions, Easy and simple interface, Accurate and fast calculations

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

**In-app purchases:** none


## Frequently asked questions

### Is Sampling Calculator free?

Sampling Calculator costs $5.99, with no in-app purchases.

### Is Unit Converter A1 free?

Unit Converter A1 is free to download, with no in-app purchases.

### Which has better reviews, Sampling Calculator or Unit Converter A1?

Sampling Calculator is rated higher. Sampling Calculator averages 5.0 out of 5 from 1 ratings, while Unit Converter A1 averages 2.0 from 1 ratings.

### Do Sampling Calculator or Unit Converter A1 have ads?

Neither Sampling Calculator nor Unit Converter A1 shows ads.

### Which is updated more often, Sampling Calculator or Unit Converter A1?

Sampling Calculator ships an update every 16 months, and Unit Converter A1 every 30 months. Most recently, Sampling Calculator was updated on September 10, 2026 and Unit Converter A1 on September 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.*