Comparison

T15 Controller vs Unlimited Multi

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

Head to head
About

T15 Controller

Features
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Using the 'T15 Controller' app on their iPhone, user can now turn 'on' (activate) or turn 'off' (deactivate) their miniature T15 radio frequency transmitter. Previously, either external magnets (for reed switch on/off control) or a separate light control box were necessary. ย  The pulses of light transmitted by the iPhone's camera flash contain an embedded code that only T15 transmitters understand. Because the LED flash is so bright and the code is very complex there is no worry that the T15 transmitters will be accidentally receive a command via any other indoor or outdoor light source. In order to reduce the size of the T15 wildlife tracking transmitter (to the smallest size telemetry transmitter in the world) conventional activation and deactivation devices (such as magnetically controlled reed switches) had to be abandoned. This also gives biologists the added convenience of being able to control their T15 transmitters with a device that is normally with them all of the time...their iPhone!

About

Unlimited Multi

Features
Read full description

This stopwatch app tracks multiple events simultaneously in simple, intuitive UI, and it tracks time with 0.01-second precision. Whether it's for training, cooking, studying, or work, every feature is designed for your convenience. Features: - Simple and sophisticated design - Intuitive user interface - Display of measurements and lap times with 0.01-second accuracy - Simultaneous timing of multiple events - Individual lap time display/hide for each stopwatch - Accurate timekeeping even when using other apps or after restarting - Designed to minimize background memory consumption and conserve battery life Additional Information: I am an independent developer and strive to accommodate your requests within the limits of my policy. Your feedback and suggestions are greatly appreciated. Thank you for your support.

Screenshots

T15 Controller2 screens
Unlimited Multi4 screens

Verdict

The call

The clearest difference is in-app purchases: T15 Controller at none against Unlimited Multi's 5. T15 Controller also leads on iOS requirement (11.3 vs 16.0). Unlimited Multi's advantage is update cadence (fortnightly vs every 9 months). On price, ads and device support there is nothing between them.

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

CostPrice ยท In-app purchases ยท Ads ยท Monetization

Both are free to download. Unlimited Multi sells 5 one-off in-app purchases. T15 Controller asks for nothing beyond the download.

UpkeepUpdate frequency

T15 Controller ships an update every 9 months, Unlimited Multi fortnightly. The most recent releases landed on September 28, 2026 and October 10, 2026 respectively.

Scorecard3 real differences ยท 3 level
T15 Controller versus Unlimited Multi: the parameters behind the verdict, then further details
ParameterT15 ControllerUnlimited Multi
PriceFreeFree
Update frequencyEvery 9 monthsFortnightly โ€” better
AdsNoNo
In-app purchasesNo โ€” betterYes
DevicesiPhone, iPodiPhone, iPad
Requires iOS11.3 โ€” better16.0
Further details โ€” not scored
Size10 MB4 MB
Age rating4+4+
DeveloperAdvanced Telemetry Systems, Inc.Yuta Onozaki

In-app purchases

None

T15 Controller

No in-app purchases

5 purchases

Unlimited Multi

One-time5
  • Dark mode$2.99
  • Ad-free$3.99
  • CSV Export$4.99
Show 2 more
  • Split$4.99
  • SimultaneousMode$4.99

Questions

Is T15 Controller free?
T15 Controller is free to download, with no in-app purchases.
Is Unlimited Multi free?
Unlimited Multi is free to download, with in-app purchases available.
Do T15 Controller or Unlimited Multi have ads?
Neither T15 Controller nor Unlimited Multi shows ads.
Which is updated more often, T15 Controller or Unlimited Multi?
T15 Controller ships an update every 9 months, and Unlimited Multi fortnightly. Most recently, T15 Controller was updated on September 28, 2026 and Unlimited Multi on October 10, 2026.

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