# NISTM vs API 571 Helpmate

The clearest difference is in-app purchases: NISTM at none against API 571 Helpmate's 1. NISTM also leads on update cadence (every 3 months vs every 8 months) and iOS requirement (12.0 vs 16.0). On price, ads and device support there is nothing between them.

Both are free to download. API 571 Helpmate sells 1 in-app purchase, starting at $29.00 per year. NISTM asks for nothing beyond the download.

NISTM ships an update every 3 months, API 571 Helpmate every 8 months. The most recent releases landed on October 8, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | NISTM | API 571 Helpmate |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/nistm/id6469011299/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 8 months |
| Monetization | Free | — |
| Size | 84 MB | 34 MB |
| Requires iOS | **12.0** | 16.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [vFairs LLC](https://appshunter.io/developer/1349888986) | [Austenite Pty Ltd](https://appshunter.io/developer/1525502686) |

## What reviewers say

### NISTM

[App page](https://appshunter.io/ios/app/nistm/id6469011299)

This platform connects professionals in the aboveground storage tank industry with the latest services, products, and technologies. It has been a leading resource for industry insights since 1989.

**Highlights:** Industry-specific services, Latest products and technology, Professional networking, Resource discovery, Industry insights

**Features:** macOS Compatibility

**In-app purchases:** none


### API 571 Helpmate

[App page](https://appshunter.io/ios/app/api-571-helpmate/id6746396841)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 12 Months Plan | $29.00 | per year |


## Frequently asked questions

### Is NISTM free?

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

### Is API 571 Helpmate free?

API 571 Helpmate is free to download, with in-app purchases available.

### Do NISTM or API 571 Helpmate have ads?

Neither NISTM nor API 571 Helpmate shows ads.

### Which is updated more often, NISTM or API 571 Helpmate?

NISTM ships an update every 3 months, and API 571 Helpmate every 8 months. Most recently, NISTM was updated on October 8, 2026 and API 571 Helpmate on October 15, 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.*