# Local Sidereal Time vs ADC Urethane Systems

The clearest difference is in-app purchases: ADC Urethane Systems at none against Local Sidereal Time's 1. ADC Urethane Systems also leads on rating (5.0 vs 4.7) and iOS requirement (11.0 vs 15.0). Local Sidereal Time's advantage is ratings volume (1.1K vs 7). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Local Sidereal Time sells 1 one-off in-app purchase. ADC Urethane Systems asks for nothing beyond the download.

ADC Urethane Systems holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Local Sidereal Time has 1.1K ratings behind it against 7, so its average is the more settled of the two.

Local Sidereal Time ships an update every 4 months, ADC Urethane Systems every 3 months. The most recent releases landed on September 26, 2026 and June 1, 2026 respectively.

## The numbers

| Metric | Local Sidereal Time | ADC Urethane Systems |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (1.1K ratings)](https://appshunter.io/ios/app/local-sidereal-time/id1256725300/reviews) | **[5.0 (7 ratings)](https://appshunter.io/ios/app/adc-urethane-systems/id1462098192/reviews)** |
| Number of ratings | **1.1K** | 7 |
| Positive reviews | 70.7% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 months** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 20 MB | 13 MB |
| Requires iOS | 15.0 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Scott Spiller](https://appshunter.io/developer/1256725299) | [CODIFI LLC](https://appshunter.io/developer/1197506641) |

## What reviewers say

### Local Sidereal Time

[App page](https://appshunter.io/ios/app/local-sidereal-time/id1256725300)

This app calculates local sidereal time, a system astronomers use to locate celestial objects. It can also be used for personal development, with studies suggesting increased psychic abilities during specific sidereal times. The pro version offers advanced features like notifications and map-based calculations.

**Highlights:** Calculate local sidereal time, Astronomy celestial object location, Potential psychic ability enhancement, Pro version notifications, Pro version map-based calculation, Pro version date/time conversion

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro | $4.99 | one-time |

**What reviewers like**

- 👍 Easy to use
- 🚀 Useful app
- 💡 Helpful notifications
- 👍 Great customer service
- 💡 Excellent tool

**What reviewers complain about**

- 🐛 Alarm doesn't work
- 🐛 Crashes frequently
- 🔒 Pro purchase issues
- 🐛 Notification issues

**Reported bugs**

- Alarm doesn't work
- Crashes when loading
- Notification issues
- Pro purchase restoration not working

**Requested features**

- Add alarm feature
- Allow setting location manually
- Improve notification handling
- Automatically adjust for daylight saving time


### ADC Urethane Systems

[App page](https://appshunter.io/ios/app/adc-urethane-systems/id1462098192)

This free utility app provides users with essential tools for urethane products. It includes casting calculators, formulation search, and access to technical data sheets and safety data sheets.

**Highlights:** Casting calculators, Formulation search, Technical data sheets, US SDS access, Urethane product information

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Local Sidereal Time free?

Local Sidereal Time is free to download, with in-app purchases available.

### Is ADC Urethane Systems free?

ADC Urethane Systems is free to download, with no in-app purchases.

### Which has better reviews, Local Sidereal Time or ADC Urethane Systems?

ADC Urethane Systems is rated higher. Local Sidereal Time averages 4.7 out of 5 from 1.1K ratings, while ADC Urethane Systems averages 5.0 from 7 ratings.

### Do Local Sidereal Time or ADC Urethane Systems have ads?

Neither Local Sidereal Time nor ADC Urethane Systems shows ads.

### Which is updated more often, Local Sidereal Time or ADC Urethane Systems?

Local Sidereal Time ships an update every 4 months, and ADC Urethane Systems every 3 months. Most recently, Local Sidereal Time was updated on September 26, 2026 and ADC Urethane Systems on June 1, 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.*