Comparison

CZI Sound vs CalcTabs

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

Head to head

Calculator with Tabs

About

CZI Sound

Features

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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.

About

CalcTabs

Features

Read full description

CalcTabs is a free offline calculator that allows having multiple multifunctional tabs. A tab is a separate calculator, current calculator tab types are: - Simple Calculator - Custom Formula This app works offline and remembers any changes to any tab to your device.

Screenshots

CZI Sound4 screens

CalcTabs4 screens

Verdict

The call

The clearest difference is ads: CZI Sound at none against CalcTabs's shown. CZI Sound also leads on update cadence (every 8 months vs every 37 months) and iOS requirement (13.0 vs 15.0). On price, 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

CZI Sound ships an update every 8 months, CalcTabs every 37 months. The most recent releases landed on November 3, 2026 and October 30, 2026 respectively.

Scorecard3 real differences · 3 level

CZI Sound versus CalcTabs: the parameters behind the verdict, then further details
Parameter	CZI Sound	CalcTabs
Price	Free	Free
Update frequency	Every 8 months — better	Every 37 months
Ads	No — better	Yes
In-app purchases	No	No
Devices	iPhone, iPad, iPod	iPhone, iPad, iPod
Requires iOS	13.0 — better	15.0
Further details — not scored
Size	64 MB	30 MB
Age rating	4+	4+
Developer	Guangzhou Chengzhi Intelligent Machine Technology Co., Ltd.	Black Flame Digital LTD

In-app purchases

None

CZI Sound

No in-app purchases

None

CalcTabs

No in-app purchases

Questions

Is CZI Sound free?

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

Is CalcTabs free?

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

Do CZI Sound or CalcTabs have ads?

CalcTabs shows ads; CZI Sound does not.

Which is updated more often, CZI Sound or CalcTabs?

CZI Sound ships an update every 8 months, and CalcTabs every 37 months. Most recently, CZI Sound was updated on November 3, 2026 and CalcTabs on October 30, 2026.