# ESS2go vs Physical Constants

The clearest difference is ads: ESS2go at none against Physical Constants's shown. ESS2go also leads on monetization model (free vs ad-supported). Physical Constants's advantage is update cadence (every 9 months vs every 37 months). On price, review sentiment, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ESS2go ships an update every 37 months, Physical Constants every 9 months. The most recent releases landed on September 23, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | ESS2go | Physical Constants |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.3 (3 ratings)](https://appshunter.io/ios/app/physical-constants-ml/id837679891/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | 33.3% of reviews | 33.3% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 37 months | **Every 9 months** |
| Monetization | **Free** | Ad-supported |
| Size | 19 MB | 25 MB |
| Requires iOS | 12.2 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Justice Institute of British Columbia](https://appshunter.io/developer/506721632) | [Takuya Ishikawa](https://appshunter.io/developer/468311118) |

## What reviewers say

### ESS2go

[App page](https://appshunter.io/ios/app/ess2go/id669853349)

This educational tool helps emergency responders plan and manage disaster situations. It provides features for team contact management, task checklists, resource calculation, and best practice guides for worker care.

**Highlights:** Team contact management, Function checklists, Evacuee meal calculation, Staffing needs planning, Guides and standards reference, Worker care reminders

**Features:** macOS Compatibility

**In-app purchases:** none


### Physical Constants

[App page](https://appshunter.io/ios/app/physical-constants-ml/id837679891)

Access a comprehensive list of physical constants, organized by category for easy searching. This app supports all AppStore languages and allows users to report corrections via email.

**Highlights:** Physical constants database, Categorized by topic, Search functionality, Multi-language support, User feedback for corrections

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

**In-app purchases:** none


## Frequently asked questions

### Is ESS2go free?

ESS2go is free to download, with no in-app purchases.

### Is Physical Constants free?

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

### Do ESS2go or Physical Constants have ads?

Physical Constants shows ads; ESS2go does not.

### Which is updated more often, ESS2go or Physical Constants?

ESS2go ships an update every 37 months, and Physical Constants every 9 months. Most recently, ESS2go was updated on September 23, 2026 and Physical Constants on October 2, 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.*