# Sampling Calculator vs CVWD Responds

The clearest difference is price: CVWD Responds at Free against Sampling Calculator's $5.99. CVWD Responds also leads on iOS requirement (9.0 vs 15.6). Sampling Calculator's advantage is ads (none vs shown) and chart position (#173 vs unranked). On update cadence, in-app purchases and device support there is nothing between them.

CVWD Responds 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 ships an update every 16 months, CVWD Responds every 19 months. The most recent releases landed on September 10, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | Sampling Calculator | CVWD Responds |
| --- | --- | --- |
| Price | $5.99 | **Free** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/sampling-calculator/id1304811062/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Every 16 months** | Every 19 months |
| Monetization | Paid | — |
| Best chart rank | **#173** | — |
| Size | 3 MB | 21 MB |
| Requires iOS | 15.6 | **9.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Juan Manuel Alfredo Sanchez](https://appshunter.io/developer/1304811061) | [Cucamonga Valley Water District](https://appshunter.io/developer/1556918887) |

## 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


### CVWD Responds

[App page](https://appshunter.io/ios/app/cvwd-responds/id1556918615)

**In-app purchases:** none


## Frequently asked questions

### Is Sampling Calculator free?

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

### Is CVWD Responds free?

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

### Do Sampling Calculator or CVWD Responds have ads?

CVWD Responds shows ads; Sampling Calculator does not.

### Which is updated more often, Sampling Calculator or CVWD Responds?

Sampling Calculator ships an update every 16 months, and CVWD Responds every 19 months. Most recently, Sampling Calculator was updated on September 10, 2026 and CVWD Responds on September 17, 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.*