Comparison

Power car C.H.A9 vs Ruler Studio

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

Head to head

PowerCar C.H.A9

Ruler, Grid & Ring Sizer

Free

🔧 Utilities

No ratingsView app →

About

Power car C.H.A9

Features

Read full description

Power Car CHA9 throttle controller is the device which can enhance your vehicle's performance.

About

Ruler Studio

Features

Read full description

Precise measuring tools Ruler, grid, calibration, and ring sizing in one clean workspace. Ruler & Grid Studio High-precision multi-unit rulers with a built-in grid for everyday measurements. Smart Ring Sizer Align a real ring with the guide to estimate diameter, circumference, and size. Card Calibration Use a standard card edge to improve real-world measurement accuracy. Free Measuring Toolkit Full-screen grids, scale presets, and measurement overlays are included for everyone. Precise ruler, grid, calibration, and ring sizing tools.

Screenshots

Power car C.H.A94 screens

Ruler Studio4 screens

Verdict

The call

The clearest difference is in-app purchases: Power car C.H.A9 at none against Ruler Studio's 1. Ruler Studio's advantage is update cadence (every 6 weeks vs every 3 months). On price, ads, device support and iOS requirement 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. Ruler Studio sells 1 one-off in-app purchase. Power car C.H.A9 asks for nothing beyond the download.

UpkeepUpdate frequency

Power car C.H.A9 ships an update every 3 months, Ruler Studio every 6 weeks. The most recent releases landed on October 2, 2026 and October 10, 2026 respectively.

Scorecard2 real differences · 4 level

Power car C.H.A9 versus Ruler Studio: the parameters behind the verdict, then further details
Parameter	Power car C.H.A9	Ruler Studio
Price	Free	Free
Update frequency	Every 3 months	Every 6 weeks — better
Ads	No	No
In-app purchases	No — better	Yes
Devices	iPhone, iPod	iPhone, iPad, iPod — better
Requires iOS	12.0 — better	13.0
Further details — not scored
Size	18 MB	19 MB
Age rating	17+	4+
Developer	Kimsroeurn Sokchea	Spyridon Bousios

In-app purchases

None

Power car C.H.A9

No in-app purchases

1 purchases

Ruler Studio

One-time1

Ruler Pro Lifetime$2.99

Questions

Is Power car C.H.A9 free?

Power car C.H.A9 is free to download, with no in-app purchases.

Is Ruler Studio free?

Ruler Studio is free to download, with in-app purchases available.

Do Power car C.H.A9 or Ruler Studio have ads?

Neither Power car C.H.A9 nor Ruler Studio shows ads.

Which is updated more often, Power car C.H.A9 or Ruler Studio?

Power car C.H.A9 ships an update every 3 months, and Ruler Studio every 6 weeks. Most recently, Power car C.H.A9 was updated on October 2, 2026 and Ruler Studio on October 10, 2026.