# Compound Offset Calculator vs Empower, by ISN

The clearest difference is price: Empower, by ISN at Free against Compound Offset Calculator's $1.99. Empower, by ISN also leads on rating (4.8 vs 2.7) and review sentiment (68% vs 33%). Compound Offset Calculator's advantage is update cadence (every 3 weeks vs every 2 months) and chart position (#193 vs unranked). On ads, in-app purchases and device support there is nothing between them.

Empower, by ISN is free to download; Compound Offset Calculator costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Empower, by ISN holds the better App Store score, 4.8 against 2.7. That said, the two scores are not equally well evidenced: Empower, by ISN has 31K ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 33% of Compound Offset Calculator's written reviews are positive against 68% of Empower, by ISN's.

Compound Offset Calculator ships an update every 3 weeks, Empower, by ISN every 2 months. The most recent releases landed on October 26, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Compound Offset Calculator | Empower, by ISN |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | [2.7 (3 ratings)](https://appshunter.io/ios/app/compound-offset-calculator/id554440222/reviews) | **[4.8 (31K ratings)](https://appshunter.io/ios/app/empower-by-isn/id1609286976/reviews)** |
| Number of ratings | 3 | **31K** |
| Positive reviews | 33.3% of reviews | **68.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 2 months |
| Monetization | Paid | **Ad-supported** |
| Best chart rank | **#193** | — |
| Size | 20 MB | 53 MB |
| Requires iOS | **10.0** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [LMF.Services](https://appshunter.io/developer/493762237) | [ISNetworld](https://appshunter.io/developer/1060652855) |

## What reviewers say

### Compound Offset Calculator

[App page](https://appshunter.io/ios/app/compound-offset-calculator/id554440222)

**Currently charting:** #193 Top Paid · Productivity (US App Store)

This app calculates complex pipe offsets, offering 36 isometric combinations. It provides accurate angles, true cut lengths, and dimensions for custom fittings, supporting both metric and imperial units. Designed for pipefitters to improve workplace efficiency.

**Highlights:** Calculates complex pipe offsets, 36 isometric combinations, Accurate offset angles, True cut length of pipe, Custom fitting dimensions, Metric and imperial charts

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

**In-app purchases:** none


### Empower, by ISN

[App page](https://appshunter.io/ios/app/empower-by-isn/id1609286976)

Access work-readiness training, digital IDs, and jobsite requirements. Manage licenses and certifications, and stay informed with AI-generated toolbox talks. Connect with hiring clients to view compliance status and bulletin board messages.

**Highlights:** Digital ISN-ID card access, View jobsite requirements and compliance, Complete trainings on-the-go, AI-generated Toolbox Talks™, Manage licenses and certifications, Access bulletin board messages

**Features:** Apple Wallet, Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 👍 Easy to use
- 🚀 Efficient training platform
- 💡 Great administrative controls
- 👍 Straightforward navigation

**What reviewers complain about**

- 🐛 Setup issues for larger companies
- 🐛 Update problems
- 🔒 Verification issues with phone number

**Reported bugs**

- Partial error messages during video playback
- App progress wiped out after restart

**Requested features**

- Option to store external documents
- Email verification option


## Frequently asked questions

### Is Compound Offset Calculator free?

Compound Offset Calculator costs $1.99, with no in-app purchases.

### Is Empower, by ISN free?

Empower, by ISN is free to download, with no in-app purchases.

### Which has better reviews, Compound Offset Calculator or Empower, by ISN?

Empower, by ISN is rated higher. Compound Offset Calculator averages 2.7 out of 5 from 3 ratings, while Empower, by ISN averages 4.8 from 31K ratings.

### Do Compound Offset Calculator or Empower, by ISN have ads?

Neither Compound Offset Calculator nor Empower, by ISN shows ads.

### Which is updated more often, Compound Offset Calculator or Empower, by ISN?

Compound Offset Calculator ships an update every 3 weeks, and Empower, by ISN every 2 months. Most recently, Compound Offset Calculator was updated on October 26, 2026 and Empower, by ISN on November 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.*