Comparison

Engine Calculator Plus vs EverLine

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

Head to head
About

Engine Calculator Plus

Calculate engine specifications for various car and plane engines, including displacement, compression ratio, and horsepower. Supports metric and imperial systems with a user-friendly interface and 3D engine visualization.

Highlights
  • Engine displacement calculation
  • Compression ratio calculation
  • Horsepower estimation
  • Metric and Imperial support
  • 3D engine display
  • Copyable results
Features
Read full description

Engine Calculator Plus is designed to help you figure out engine specs for all car or plane engine types from inline 4 to V12 Engine. This calculator provides calculations for engine displacement based on either the metric or US standard system. Features: - User friendly UI - Engine type selection from single cylinder to complex W16 or even custom cylinder count. - Display 3D engine from selection - Metric or Imperial input - Output Engine Displacement on cc, liter and cubic inch - Output Compression ratio of engine - Calculate estimate horse power in HP and Kilowatts - Include formula to calculate the engine displacement in help page - Result are copy-able to other app The engine's static compression ratio is easily calculated if you know six measurements or volumes: Bore - The diameter of the cylinder bore Stroke - The distance the piston travels in the cylinder Deck Height - The distance between the top of the cylinder bore and the top of the piston, when the piston is at TDC (Top Dead Center, or at its highest position) Piston top volume - If the piston is dished, domed, or dimpled, that has an affect on compression ratio. Combustion chamber volume - How much open space is in the head above the cylinder Compression ratios: Higher compression ratios cylinder produces better power and fuel economy. It is not just because the charge is squeezed harder and the resulting combustion pressure goes up, but also because the higher expansion ratio allows more energy to be extracted from the original high-pressure. High compression ratio engines burn both much more cleanly and much more efficiently than lower-compression engines. However a lower compression motor will let you run cheap fuel, but your motor won't be as efficient, less efficient and less power. *Thanks for your support, stay tune for more update to come.

About

EverLine

Record and visualize life's moments and progress. Capture events, track growth, and document journeys with customizable timelines. Share your creations easily and sync data across devices.

Highlights
  • Record life timelines
  • Track growth and progress
  • High-definition image uploads
  • Customizable color schemes and icons
  • Custom numerical value tracking
  • Timeline image sharing
  • iCloud data sync
Read full description

EverLine - A High-Quality Timeline Recording Tool You can use it to record any timeline in your life. Record every show you watch, every mountain you climb... Document the growth of a puppy, the development of a relationship... Track your journey of learning a foreign language from mastering the alphabet to passing an exam, or the progress of a product from 0 to 1. High-definition image uploads: Easily capture important moments in life. Customizable color schemes and node icons: Freely define your unique style. Custom numerical values: Track changes in data with each record, visually seeing growth and progress. Timeline image sharing: Generate beautiful timeline images with one click and share them on social media. iCloud data sync: Seamlessly switch between devices anytime, anywhere, with no risk of data loss.

Screenshots

Engine Calculator Plus4 screens
EverLine4 screens

Verdict

The call

The clearest difference is price: EverLine at Free against Engine Calculator Plus's $2.99. EverLine also leads on rating (5.0 vs 4.0) and update cadence (weekly vs every 48 months). Engine Calculator Plus's advantage is in-app purchases (none vs 1) and iOS requirement (13 vs 17.2). On ratings volume, ads 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

EverLine is free to download; Engine Calculator Plus costs $2.99 up front. EverLine sells 1 one-off in-app purchase. Engine Calculator Plus asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

EverLine holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

UpkeepUpdate frequency

Engine Calculator Plus ships an update every 48 months, EverLine weekly. The most recent releases landed on October 15, 2026 and September 20, 2026 respectively.

Scorecard6 real differences · 4 level
Engine Calculator Plus versus EverLine: the parameters behind the verdict, then further details
ParameterEngine Calculator PlusEverLine
Price$2.99Free — better
Rating4.0 (1 ratings)5.0 (1 ratings) — better
Positive reviews12.5% of reviews—
Number of ratings11
Update frequencyEvery 48 monthsWeekly — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS13 — better17.2
Further details — not scored
Size2 MB11 MB
Age rating4+17+
DeveloperNitrio俣 朱

Customer experience

Engine Calculator Plus

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews8 reviews
Positive12.5%
Neutral0.0%
Negative87.5%

EverLine

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Engine Calculator Plus

No in-app purchases

1 purchases

EverLine

One-time1
  • Everline Lifetime Premium$8.99

Questions

Is Engine Calculator Plus free?
Engine Calculator Plus costs $2.99, with no in-app purchases.
Is EverLine free?
EverLine is free to download, with in-app purchases available.
Which has better reviews, Engine Calculator Plus or EverLine?
EverLine is rated higher. Engine Calculator Plus averages 4.0 out of 5 from 1 ratings, while EverLine averages 5.0 from 1 ratings.
Do Engine Calculator Plus or EverLine have ads?
Neither Engine Calculator Plus nor EverLine shows ads.
Which is updated more often, Engine Calculator Plus or EverLine?
Engine Calculator Plus ships an update every 48 months, and EverLine weekly. Most recently, Engine Calculator Plus was updated on October 15, 2026 and EverLine on September 20, 2026.

Other comparisons