Comparison

MAR vs CZI Sound

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

Head to head
About

MAR

Features
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These are datasheets of chemical substances developed by EMSA (European Maritime Safety Agency) that contain relevant information for responding to marine spill of hazardous and noxious substances (HNS). The MAR-CIS datasheets provide concise information on the substances' physical and chemical properties, handling and emergency spill response procedures, as well as maritime transport requirements for safe transport at sea. They collect different types of information on individual chemical substances: −Key properties: main hazards, and physical and chemical properties that define the emergency response operations from the very beginning e.g. flash point, vapour pressure; −Identification: reference numbers and names used to identify the substance; −Substance properties: main properties, appearance and behaviour; −Shipping information: explanatory information from the maritime transportation codes (e.g. IMDG, IBC and IMSBC codes) to help to understand how the substance is transported by sea and what responders can expect when they go on-board a vessel. Graphical representation of the GESAMP hazard profile; −Hazards and risks: classification and labelling, health and environmental hazards and substance intrinsic hazards; −Emergency measures: emergency health measures, emergency measures on board of vessels, exposure safety limits, environmental protection measures and danger zones for six different spill scenarios; −Case histories: past incidents involving the substances and response used; −Physical and chemical properties: the fingerprint of the substance. The application runs offline.

About

CZI Sound

Features
Read full description

CZI Sound processes the audio source files (TTS, recordings, mixed audio) with a loudness-enhancing algorithm and then uploads them to the shoutbox via Bluetooth. It can also push the latest broadcast content of firmware and industry applications, ground proximity control of the shoutbox to play songs, etc.

Screenshots

MAR4 screens
CZI Sound4 screens

Verdict

The call

The clearest difference is iOS requirement: MAR at 11.0 against CZI Sound's 13.0. On price, update cadence, ads and in-app purchases 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

MAR ships an update every 9 months, CZI Sound every 8 months. The most recent releases landed on November 11, 2026 and November 3, 2026 respectively.

Scorecard1 real difference · 5 level
MAR versus CZI Sound: the parameters behind the verdict, then further details
ParameterMARCZI Sound
PriceFreeFree
Update frequencyEvery 9 monthsEvery 8 months — better
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS11.0 — better13.0
Further details — not scored
Size15 MB64 MB
Age rating4+4+
DeveloperEuropean Maritime Safety AgencyGuangzhou Chengzhi Intelligent Machine Technology Co., Ltd.

In-app purchases

None

MAR

No in-app purchases

None

CZI Sound

No in-app purchases

Questions

Is MAR free?
MAR is free to download, with no in-app purchases.
Is CZI Sound free?
CZI Sound is free to download, with no in-app purchases.
Do MAR or CZI Sound have ads?
Neither MAR nor CZI Sound shows ads.
Which is updated more often, MAR or CZI Sound?
MAR ships an update every 9 months, and CZI Sound every 8 months. Most recently, MAR was updated on November 11, 2026 and CZI Sound on November 3, 2026.

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