Comparison

Mark That vs C

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

Head to head
About

Mark That

Features
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Never forget when was the last time you fed your dog, took your pills or had coffee. Just ask Siri to mark that something happened, and you can later ask Siri when did it happen. Can only take a headache medication every 4 hours, let Siri remember it for you! *** Siri commands available with Mark That *** To remember that something happened right now Say Hey Siri, Mark That, pause for Siri to ask what happened, and then continue, for example: say "Hey Siri Mark that", pause, "I had coffee" say "Hey Siri Mark that", pause, "I woke up from my nap" To have Siri tell you when you something happened say, Hey Siri, When did I mark that, for Siri to ask which event you're interested in, and then continue, for example: say "Hey Siri When did I mark" pause, "That I had coffee?" say "Hey Siri When did I mark", pause "That I work up from my nap?" You can also ask Siri to show you today's events: say, Hey Siri show me what I marked today", or what was the last thing you marked today say, Hey Siri what was the last thing I marked today

About

C

Features
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C OX is a new type of smart glasses assistive tool. When connected to a device, it can view images in real time, take photos and record videos, and also has functions such as setting the recording duration, checking the storage space of the glasses' SD card, and firmware upgrades. It can also view, download, and delete videos and pictures on the glasses' SD card.

Screenshots

Mark That4 screens
C3 screens

Verdict

The call

The clearest difference is iOS requirement: C at 12.0 against Mark That's 16.0. 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

Mark That ships an update every 5 days, C every 10 days. The most recent releases landed on October 9, 2026 and October 5, 2026 respectively.

Scorecard1 real difference · 5 level
Mark That versus C: the parameters behind the verdict, then further details
ParameterMark ThatC
PriceFreeFree
Update frequencyEvery 5 days — betterEvery 10 days
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPadiPhone, iPod
Requires iOS16.012.0 — better
Further details — not scored
Size1 MB56 MB
Age rating4+12+
DeveloperRon SrebroXiamen C-chip Technology Co., Ltd.

In-app purchases

None

Mark That

No in-app purchases

None

C

No in-app purchases

Questions

Is Mark That free?
Mark That is free to download, with no in-app purchases.
Is C free?
C is free to download, with no in-app purchases.
Do Mark That or C have ads?
Neither Mark That nor C shows ads.
Which is updated more often, Mark That or C?
Mark That ships an update every 5 days, and C every 10 days. Most recently, Mark That was updated on October 9, 2026 and C on October 5, 2026.

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