Comparison

BT Light vs TMark

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

Head to head

Security at ease

About

BT Light

Features

Read full description

Changing color by smart phone or pad with easy installation, through changing the lighting atmosphere by your finger! Whether common white light of home, colorful lighting for party, atmosphere for watching movie, or reading atmosphere of warm white lighting, all the atmosphere can be create through APP of BLTC color changing lamp series, creating fantastic visual enjoyment.

About

TMark

Features

Read full description

Tmark provides Employees attendance & guards activity in real time to coordinate and manege with them to increase organization's overall performance. Get a smart detailed report of all attendance & activity. Including date, time, location and image processing feature. Manage all your clients, sites routes and checkpoints on platform in an easy and effective way.

Screenshots

BT Light4 screens

TMark4 screens

Verdict

The call

The clearest difference is iOS requirement: BT Light at 11.0 against TMark'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

BT Light ships an update every 6 weeks, TMark every 2 months. The most recent releases landed on October 9, 2026 and October 1, 2026 respectively.

Scorecard1 real difference · 5 level

BT Light versus TMark: the parameters behind the verdict, then further details
Parameter	BT Light	TMark
Price	Free	Free
Update frequency	Every 6 weeks — better	Every 2 months
Ads	No	No
In-app purchases	No	No
Devices	iPhone, iPod	iPhone, iPad
Requires iOS	11.0 — better	16.0
Further details — not scored
Size	27 MB	29 MB
Age rating	4+	4+
Developer	Beautiful Light Technology Corp.	Anuj Nigam

In-app purchases

None

BT Light

No in-app purchases

None

TMark

No in-app purchases

Questions

Is BT Light free?

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

Is TMark free?

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

Do BT Light or TMark have ads?

Neither BT Light nor TMark shows ads.

Which is updated more often, BT Light or TMark?

BT Light ships an update every 6 weeks, and TMark every 2 months. Most recently, BT Light was updated on October 9, 2026 and TMark on October 1, 2026.