Comparison

HSADSP.31 vs T

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

Head to head
About

HSADSP.31

Features
Read full description

After connecting App to Car Amplifier with Integrated DSP,  EQ, BASS, TIME ALIGNMENT, PHASE, MUTE, FILTER , SAVE SOUND SETTING TO PHONE, SAVE SOUND SETTING TO AMPLIFIER, LOAD SOUND SETTING FROM PHONE, RCA OUTPUT etc could be controlled through this App. How to use: 1.Install App and turn on power of car 2. Turn on Bluetooth on your iPhone 3,Open App and wait for around 5 seconds, then click “Connect” icon in left corner of bottom. Amplifier will be connected to App automatically. 4.DIY you preferred sound and then click “Save to AMP” icon to save. Or click “ Save to Phone” to save.   Note: 1.Do not exit app during saving and do not turn off power supply, program may be shut down caused by this.

About

T

This app offers a dual calculator interface, allowing side-by-side or stacked calculations. Easily transfer results between calculators with a single touch for complex computations. It displays formulas for clarity and allows copying results to your device's memory.

Highlights
  • Two calculators in one
  • Copy and paste results between calculators
  • Input results from one calculator to another
  • Formula display
  • Copy results to device memory
  • Supports basic arithmetic operations
Features
Read full description

A simple and easy-to-use calculator app that combines two calculators into one. Calculators are displayed side by side when the screen is horizontal, and vertically when the screen is vertical. In addition to being able to perform separate calculations with each calculator, calculation results can be also copy and paste with one touch, so you can perform other calculations during calculations, making it even more convenient to use than you might imagine. There is also a paid version without ads. Please try it first. https://apps.apple.com/jp/app/twin-calc/id1619292082 【feature】 1. Calculation results can be copy and paste between two calculators with one touch. 2. The result calculated can be input from one calculator to the other with one touch. ・When press the "→" key, the calculation result of the left calculator is entered at the end of the formula on the right calculator. ・When press the "←" key, the calculation result of the right calculator is entered at the end of the formula on the left calculator. 3. add, subtract, multiply and divide is performed. Do multiplication and division first, then add and subtract. 4. Display the formula The entered formula is displayed under the result, so you can easily check the operations. 5. Calculation results can be copied to iPhone’s memory Calculation results can be pasted into other apps as text , so transcription errors will not occur. Example of use When you find a product for 988 yen for 3 pieces and a product for 1245 yen for 4 pieces while shopping, you can easily calculate "Which is cheaper?" And “How cheaper?"with this calculator. 1) Use the left and right calculators to find the unit price of the product (unit price = product price/number). 2) Tap the "- key" and "arrow key" on either the left or right calculator to calculate the unit price difference. Limitations ・Answer can be calculated up to 9 digits, minimum 0.000000001.

Screenshots

HSADSP.314 screens
T4 screens

Verdict

The call

The clearest difference is update cadence: T at weekly against HSADSP.31's every 3 months. HSADSP.31's advantage is iOS requirement (8.0 vs 15.0). On price, ads, 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

HSADSP.31 ships an update every 3 months, T weekly. The most recent releases landed on October 26, 2026 and October 24, 2026 respectively.

Scorecard2 real differences · 8 level
HSADSP.31 versus T: the parameters behind the verdict, then further details
ParameterHSADSP.31T
PriceFreeFree
Rating—5.0 (2 ratings) — better
Positive reviews—42.9% of reviews
Number of ratings—2 — better
Update frequencyEvery 3 monthsWeekly — better
AdsNoNo
In-app purchasesNoNo
Monetization—Free
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS8.0 — better15.0
Further details — not scored
Size13 MB4 MB
Age rating4+4+
Developer杏生 卢Hiroyuki Ueda

In-app purchases

None

HSADSP.31

No in-app purchases

None

T

No in-app purchases

Questions

Is HSADSP.31 free?
HSADSP.31 is free to download, with no in-app purchases.
Is T free?
T is free to download, with no in-app purchases.
Do HSADSP.31 or T have ads?
Neither HSADSP.31 nor T shows ads.
Which is updated more often, HSADSP.31 or T?
HSADSP.31 ships an update every 3 months, and T weekly. Most recently, HSADSP.31 was updated on October 26, 2026 and T on October 24, 2026.

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