Comparison

What Gas? vs WCO CLiKC!

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

What Gas?

This tool helps identify refrigerant gases, including ozone-depleting substances and their alternatives. It provides detailed information on chemical properties, hazards, and regulatory status for customs officers and technicians.

Highlights
  • Refrigerant gas identification
  • Information on ODS and alternatives
  • Details on ODP and GWP values
  • Searchable database
  • Flammability and hazard information
  • Montreal Protocol compliance data
  • Available in French and Spanish
Features
Read full description

The UN Environment Programme (UNEP) OzonAction WhatGas? application is an information and identification tool for refrigerant gases: ozone depleting substances (ODS), hydrofluorocarbons (HFCs) and other alternatives. It is intended to provide a number of stakeholders, including customs officers, Montreal Protocol National Ozone Officers and refrigeration and air-conditioning technicians with a modern, easy-to-use tool that can be accessed via mobile devices to facilitate work in the field, when dealing with or inspecting ODS and alternatives. If the user requires additional information or assistance in identifying a refrigerant gas they are inspecting or that is described in the relevant paperwork, this can be easily obtained by consulting the application. The application has been updated and improved. It uses standard ODP values and GWP values as specified in the text of the Montreal Protocol; other ozone depleting potential and global warming potential values from the recent reports from the Montreal Protocol technology and scientific expert panels as well as the Intergovernmental Panel on Climate Change (IPCC) are indicated when appropriate, with references to sources of all values used. The app includes the new refrigerant mixtures (with ASHRAE approved refrigerant designations) and values for ‘actual GWP’ and ‘Kigali Amendment context GWP’ for pure substances and mixtures (i.e. only including GWP values/components assigned to controlled HFCs). The app is searchable via a variety of methods and provides a wealth of useful information. By entering partial information or browsing the database, the application will provide quick reference information on many aspects of the chemical in question, including: the chemical name and formula; type of chemical, common trade names; various chemical and commodity identifiers (CAS numbers, ASHRAE designations, HS codes, UN numbers, etc); as well as other useful information such as flammability and other hazards; the ozone depleting and global warming potentials, and if the chemical is controlled under the Montreal Protocol. The app includes both pure substances and mixtures (blends) and can also be viewed in French and Spanish. The application forms a part of UNEP OzonAction’s portfolio of activities and tools to assist developing countries. OzonAction provides assistance to various stakeholders in developing countries, including customs officers and technicians, to achieve and maintain compliance with the Montreal Protocol on Substances the Deplete the Ozone Layer.

About

WCO CLiKC!

Features
Read full description

The WCO CLiKC! app gives you access to the World Customs Organisation’s courses and learning directly from your mobile device. On the app, you will be able to complete courses and get certified anywhere and anytime, even whilst you are offline Download the app today to begin your Customs knowledge learning journey.

Screenshots

What Gas?1 screens
WCO CLiKC!2 screens

Verdict

The call

The clearest difference is update cadence: WCO CLiKC! at every 10 months against What Gas?'s every 37 months. What Gas?'s advantage is iOS requirement (13.0 vs 15.6). On price, ads, in-app purchases and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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

UpkeepUpdate frequency

What Gas? ships an update every 37 months, WCO CLiKC! every 10 months. The most recent releases landed on October 11, 2026 and October 25, 2026 respectively.

Scorecard2 real differences · 7 level
What Gas? versus WCO CLiKC!: the parameters behind the verdict, then further details
ParameterWhat Gas?WCO CLiKC!
PriceFreeFree
Rating5.0 (1 ratings) — better—
Number of ratings1 — better—
Update frequencyEvery 37 monthsEvery 10 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.0 — better15.6
Further details — not scored
Size24 MB40 MB
Age rating17+12+
DeveloperUNEPUPLearning B.V.

In-app purchases

None

What Gas?

No in-app purchases

None

WCO CLiKC!

No in-app purchases

Questions

Is What Gas? free?
What Gas? is free to download, with no in-app purchases.
Is WCO CLiKC! free?
WCO CLiKC! is free to download, with no in-app purchases.
Do What Gas? or WCO CLiKC! have ads?
Neither What Gas? nor WCO CLiKC! shows ads.
Which is updated more often, What Gas? or WCO CLiKC!?
What Gas? ships an update every 37 months, and WCO CLiKC! every 10 months. Most recently, What Gas? was updated on October 11, 2026 and WCO CLiKC! on October 25, 2026.

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