Comparison

SMART Testz vs X

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

Head to head
About

SMART Testz

Features
Read full description

Test the basic functions of the phone and provide a grade.

About

X

Features
Read full description

X-FLAP gives you full control of your exhaust valve controller directly from your smartphone. Connect via Bluetooth and manage your valve settings with ease โ€” no complicated setup, no extra tools required. Valve Mode Control Switch between three modes instantly: ON โ€“ Valve stays open OFF โ€“ Valve stays closed NOR โ€“ Valve operates in normal factory behavior Startup Default Mode Choose what state your valve is in when you start your vehicle: Fixed to ON, OFF, or NOR Or resume the last state before your previous shutdown Custom Valve Threshold Settings Adjust the system value that determines when your valve opens or closes โ€” giving you precise control over your exhaust behavior without relying on automatic triggers. Real-Time Status Display Monitor your current valve state at a glance directly within the app. Simple Bluetooth Connection Pair your phone with the X-FLAP controller quickly and manage everything from one clean interface. X-FLAP is designed for drivers who want straightforward, reliable control over their exhaust system โ€” without unnecessary complexity.

Screenshots

SMART Testz4 screens
X4 screens

Verdict

The call

The clearest difference is device support: SMART Testz at 3 against X's 1. SMART Testz also leads on iOS requirement (13.0 vs 17.0). On price, update cadence, ads and in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

SMART Testz ships an update fortnightly, X every 9 days. The most recent releases landed on October 17, 2026 and October 8, 2026 respectively.

Scorecard2 real differences ยท 4 level
SMART Testz versus X: the parameters behind the verdict, then further details
ParameterSMART TestzX
PriceFreeFree
Update frequencyFortnightlyEvery 9 days โ€” better
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPad, iPod โ€” betteriPhone
Requires iOS13.0 โ€” better17.0
Further details โ€” not scored
Size5 MB9 MB
Age rating4+4+
DeveloperFutureDial Inc.Auto jaw co ltd

In-app purchases

None

SMART Testz

No in-app purchases

None

X

No in-app purchases

Questions

Is SMART Testz free?
SMART Testz is free to download, with no in-app purchases.
Is X free?
X is free to download, with no in-app purchases.
Do SMART Testz or X have ads?
Neither SMART Testz nor X shows ads.
Which is updated more often, SMART Testz or X?
SMART Testz ships an update fortnightly, and X every 9 days. Most recently, SMART Testz was updated on October 17, 2026 and X on October 8, 2026.

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