Comparison

CDI vs RevLogic

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

Head to head
About

CDI

Features
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Unlock Full Performance Take Full Control! Enhance your engine’s performance with easy tuning at your fingertips. Key Features: 1. Ignition Timing Adjustment – Fine-tune ignition timing for maximum torque and power. 2. Rev Limit Adjustment – Set the engine's rev limit to unlock its full potential. 3. Mode Switching – Easily switch between driving modes for optimal performance. 4. Quick Shift – Faster gear shifts, reduced lag, and improved acceleration. 5. Hold/Reset Max Speed – Record and reset your top speed effortlessly. 6. Logging Function – Monitor real-time engine performance data. 7. Load/Save File Tune – Save and load tuning files instantly. 8. Launch Control – Optimize launch settings for powerful, wheel-spin-free acceleration. User-friendly – Suitable for both beginners and pro tuners! Download now and unleash your engine’s true potential!

About

RevLogic

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RevLogic – Engine Build Calculators Build smarter. Tune with confidence. RevLogic is the all-in-one engine calculator suite for racers, engine builders, mechanics, tuners, and performance enthusiasts. Whether you're building a two-stroke or four-stroke engine, RevLogic provides accurate, easy-to-use calculators to help you make informed decisions throughout your build. From basic engine specifications to advanced performance calculations, RevLogic helps eliminate guesswork and saves valuable time in the garage. Features β€’ 50+ precision engine calculators β€’ Support for both two-stroke and four-stroke engines β€’ Save and organize your engine builds β€’ Metric and Imperial unit support β€’ Fast, clean, and intuitive interface β€’ Instant calculations with accurate formulas β€’ Export build summaries for reference Included Calculators Bottom End β€’ Engine Displacement β€’ Static Compression Ratio β€’ Dynamic Compression Ratio β€’ Piston Speed β€’ Piston Ring Gap β€’ Reciprocating Inertia β€’ Crankshaft Bob Weight β€’ Target Compression Ratio Solver Valvetrain β€’ Cam Timing β€’ Valve Size & Lift β€’ Valve Spring Calculator Induction β€’ Airflow / Carb CFM β€’ Carburetor Venturi Size β€’ Airflow to Horsepower Driveline β€’ Gear Ratio & RPM β€’ Final Drive Optimizer Performance β€’ Quarter Mile Horsepower Estimator Cylinder Head β€’ Port Shape Converter β€’ Squish Area Calculator Fuel β€’ Fuel Injector Sizing β€’ Fuel Pump Sizing β€’ Ethanol / E85 Blend Calculator Exhaust β€’ Exhaust Header Calculator Tuning β€’ AFR Target Table β€’ Spark Advance Recommendations β€’ Altitude Correction Forced Induction β€’ Effective Compression Ratio β€’ Boost Calculator Power Adders β€’ Nitrous Calculator More calculators are added with every major update. RevLogic Lite Start for free with RevLogic Lite. Lite includes essential calculators and allows you to save one active engine build, making it perfect for hobbyists and first-time users. Upgrade to RevLogic Pro Unlock the full potential of RevLogic with Pro. Pro includes: β€’ Access to every calculator β€’ Unlimited saved engine builds β€’ Advanced calculation tools β€’ Detailed results and recommendations β€’ Future premium features as they're released Whether you're building a street engine, race engine, kart, dirt bike, motorcycle, or custom project, RevLogic gives you the tools you need to build with confidence. Download RevLogic today and build smarter. Perform better.

Screenshots

CDI4 screens
RevLogic4 screens

Verdict

The call

The clearest difference is in-app purchases: CDI at none against RevLogic's 1. CDI also leads on ads (none vs shown) and iOS requirement (13.0 vs 15.0). RevLogic's advantage is update cadence (daily vs every 2 months). On price and device support there is nothing between them.

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

CostPrice Β· In-app purchases Β· Ads Β· Monetization

Both are free to download. RevLogic sells 1 one-off in-app purchase. CDI asks for nothing beyond the download.

UpkeepUpdate frequency

CDI ships an update every 2 months, RevLogic daily. The most recent releases landed on September 30, 2026 and September 13, 2026 respectively.

Scorecard4 real differences Β· 2 level
CDI versus RevLogic: the parameters behind the verdict, then further details
ParameterCDIRevLogic
PriceFreeFree
Update frequencyEvery 2 monthsDaily β€” better
AdsNo β€” betterYes
In-app purchasesNo β€” betterYes
DevicesiPhone, iPodiPhone, iPod
Requires iOS13.0 β€” better15.0
Further details β€” not scored
Size29 MB65 MB
Age rating17+17+
DeveloperECU=SHOPRHEINEL ROI MANALO

In-app purchases

None

CDI

No in-app purchases

1 purchases

RevLogic

One-time1
  • RevLogic Pro$29.99

Questions

Is CDI free?
CDI is free to download, with no in-app purchases.
Is RevLogic free?
RevLogic is free to download, with in-app purchases available.
Do CDI or RevLogic have ads?
RevLogic shows ads; CDI does not.
Which is updated more often, CDI or RevLogic?
CDI ships an update every 2 months, and RevLogic daily. Most recently, CDI was updated on September 30, 2026 and RevLogic on September 13, 2026.

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