# Sampling Calculator vs Locus GTD

The clearest difference is price: Locus GTD at Free against Sampling Calculator's $5.99. Locus GTD also leads on update cadence (every 4 days vs every 16 months) and review sentiment (75% vs 50%). Sampling Calculator's advantage is rating (5.0 vs 4.1) and in-app purchases (none vs 4). On ads and device support there is nothing between them.

Locus GTD is free to download; Sampling Calculator costs $5.99 up front. Locus GTD sells 4 in-app purchases, starting at $1.19 per 7 days. Sampling Calculator asks for nothing beyond the download.

Sampling Calculator holds the better App Store score, 5.0 against 4.1. That said, the two scores are not equally well evidenced: Locus GTD has 9 ratings behind it against 1, so its average is the more settled of the two. Written reviews complicate that: 50% of Sampling Calculator's written reviews are positive against 75% of Locus GTD's, so the app with the better star average is not the one people write more warmly about.

Sampling Calculator ships an update every 16 months, Locus GTD every 4 days. The most recent releases landed on September 28, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | Sampling Calculator | Locus GTD |
| --- | --- | --- |
| Price | $5.99 | **Free** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/sampling-calculator/id1304811062/reviews)** | [4.1 (9 ratings)](https://appshunter.io/ios/app/locus-gtd-ai-task-planner/id6738880378/reviews) |
| Number of ratings | 1 | **9** |
| Positive reviews | 50.0% of reviews | **75.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 16 months | **Every 4 days** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 3 MB | 54 MB |
| Requires iOS | **15.6** | 18.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Juan Manuel Alfredo Sanchez](https://appshunter.io/developer/1304811061) | [嘉豪 栾](https://appshunter.io/developer/1697593253) |

## What reviewers say

### Sampling Calculator

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

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


### Locus GTD

[App page](https://appshunter.io/ios/app/locus-gtd-ai-task-planner/id6738880378)

This app helps you manage tasks and projects efficiently with AI-powered planning, intelligent filtering, and customizable organization. It aims to bring clarity and control to your life, helping you find focus and master your workflow.

**Highlights:** AI-powered task breakdown, Infinite-level projects, Flexible tagging system, Intelligent filtering and perspectives, Customizable themes, iCloud synchronization

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Locus Pro (1 Week) | $1.19 | per 7 days |
| Locus Pro (1 Month) | $2.49 | per month |
| Locus Pro (1 Year) | $24.99 | per year |
| Locus Pro (Lifetime) | $79.99 | one-time |


## Frequently asked questions

### Is Sampling Calculator free?

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

### Is Locus GTD free?

Locus GTD is free to download, with in-app purchases available.

### Which has better reviews, Sampling Calculator or Locus GTD?

Sampling Calculator is rated higher. Sampling Calculator averages 5.0 out of 5 from 1 ratings, while Locus GTD averages 4.1 from 9 ratings.

### Do Sampling Calculator or Locus GTD have ads?

Neither Sampling Calculator nor Locus GTD shows ads.

### Which is updated more often, Sampling Calculator or Locus GTD?

Sampling Calculator ships an update every 16 months, and Locus GTD every 4 days. Most recently, Sampling Calculator was updated on September 28, 2026 and Locus GTD on October 3, 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.*