Comparison

Engine Miles vs OS Translator

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

Head to head
About

Engine Miles

This app helps hybrid and plug-in hybrid vehicle owners track their gasoline engine mileage. It logs fuel fill-ups and estimates engine usage for maintenance reminders. Pro features offer advanced insights, multiple vehicle support, and data export.

Highlights
  • Estimate gasoline engine mileage
  • Log fuel fill-ups
  • Oil change reminders
  • Track multiple vehicles (Pro)
  • Fuel use and cost insights (Pro)
  • Gas vs. electric mileage split (Pro)
  • CSV import/export (Pro)
Features
Read full description

Your odometer shows how far your car has gone. Engine Miles helps you estimate how far its gasoline engine has gone. Built for hybrid and plug-in hybrid (PHEV) drivers, Engine Miles uses the fuel you log and your vehicle's gas-mode fuel economy to estimate engine mileage. Keep your fill-ups in one clear log and follow an oil-change goal based on estimated engine miles. START FREE Track one vehicle, log unlimited manual fill-ups, edit your history, and see your estimated engine-mile total. Log oil changes and follow your next oil-change estimate. GO FURTHER WITH ENGINE MILES PRO Add multiple vehicles, explore fuel use and costs in Insights, and look back with a year recap. For plug-in hybrids, see the estimated gas-versus-electric mileage split. Pro also includes CSV import and export, a full backup, Home Screen and Lock Screen widgets, and notification reminders. Choose a monthly or yearly subscription, or a lifetime purchase, to unlock Pro. No account is required. Your vehicle log stays on your iPhone. Usage sharing helps improve the app and can be turned off in Settings > Privacy. Engine mileage and electric mileage are estimates based on the information you enter. Regular hybrids do not show an electric-mileage split. Follow your vehicle manufacturer's maintenance recommendations; the oil-change estimate is a guide, not maintenance advice. Pro subscriptions renew automatically unless cancelled at least 24 hours before the end of the current period. Manage or cancel them in your Apple Account settings. Lifetime is a one-time purchase. Terms of Use: https://enginemiles.com/terms Privacy Policy: https://enginemiles.com/privacy

About

OS Translator

Instantly translate text on your screen while using other apps. It supports games, comics, and online shops, displaying translations in a Picture in Picture window. Choose between mirroring the original text or viewing translations as a list.

Highlights
  • Live on-screen translation
  • Picture in Picture window
  • Mirror mode for text overlay
  • Subtitles mode for dialogue lists
  • Offline translation support
  • Supports 20 languages
Features
Read full description

The translation, right where the original text was. Play a Japanese game, read a Chinese comic or browse an overseas shop, and OS Translator reads the text on your screen and translates it on the spot. While you use any other app, OS Translator reads your screen and shows the translation in a Picture in Picture window. When the screen changes, the translation follows within about a second. No screenshots, no copy and paste. TWO WAYS TO READ • Mirror mode — Place the PiP window at the top or bottom of the screen, and it mirrors the other half with the translation laid over the original text. Speech bubbles and product pages read just as they look. • Subtitles mode — Game dialogue, menus, chat and captions burned into videos appear as a list in the PiP window, starting with the paragraphs closest to what you're reading. • On iPad, put another app next to OS Translator in Split View or Stage Manager. The app mirrors it and lays the translation right over the original text. HOW IT WORKS • Pick the language to read and tap Start Translating. • Share your entire screen when iOS asks, then go to your game, comic or app. • Move and resize the translation window as you like. Stop anytime from the app or the screen recording indicator. GREAT FOR • Dialogue and quests in Japanese games • Manga, webtoons and web novels that haven't been translated yet • Product names, options and details in overseas shops • Social media and forums in other languages • Captions burned into videos ALSO • Reading direction for vertical manga • Choose whether to show the original text • Recent Translations keeps what you read so you can view and copy it again EVERY FEATURE FREE No limits on time or number of translations, and every feature is free. A short ad may play before you start translating. The only purchase is Remove Ads — buy once and it's yours for good. TRANSLATED ON YOUR DEVICE Reading the screen and translating both happen on your device with Apple's built-in text recognition and translation. What's on your screen is never sent anywhere or saved. Once a language is downloaded, translation works even in Airplane Mode. LANGUAGES Translate between 20 languages, including English, Japanese, Korean, Chinese (Simplified and Traditional), Spanish, French, German, Portuguese, Russian, Arabic, Hindi, Thai, Vietnamese and more.

Screenshots

Engine Miles4 screens
OS Translator4 screens

Verdict

The call

The clearest difference is ads: Engine Miles at none against OS Translator's shown. Engine Miles also leads on update cadence (every 3 days vs every 8 days) and iOS requirement (17.0 vs 27.0). On price, rating, ratings volume and in-app purchases 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. Engine Miles sells 3 in-app purchases, starting at $2.99 per month and OS Translator sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for Engine Miles against 5.0 for OS Translator. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

UpkeepUpdate frequency

Engine Miles ships an update every 3 days, OS Translator every 8 days. The most recent releases landed on November 10, 2026 and November 6, 2026 respectively.

Scorecard3 real differences · 7 level
Engine Miles versus OS Translator: the parameters behind the verdict, then further details
ParameterEngine MilesOS Translator
PriceFreeFree
Rating5.0 (1 ratings)5.0 (1 ratings)
Positive reviews—100.0% of reviews
Number of ratings11
Update frequencyEvery 3 days — betterEvery 8 days
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFreemiumFree with in-app purchases
DevicesiPhoneiPhone, iPad — better
Requires iOS17.0 — better27.0
Further details — not scored
Size32 MB13 MB
Age rating4+4+
DeveloperTooAvid Technologies LLCSunghyun Kim

In-app purchases

3 purchases

Engine Miles

Subscriptions2
  • EngineMiles Pro Monthly$2.991 Month
  • EngineMiles Pro Yearly$19.991 Year
One-time1
  • EngineMiles Pro Lifetime$29.99
1 purchases

OS Translator

One-time1
  • Remove Ads$3.99

Questions

Is Engine Miles free?
Engine Miles is free to download, with in-app purchases available.
Is OS Translator free?
OS Translator is free to download, with in-app purchases available.
Which has better reviews, Engine Miles or OS Translator?
Engine Miles and OS Translator are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.
Do Engine Miles or OS Translator have ads?
OS Translator shows ads; Engine Miles does not.
Which is updated more often, Engine Miles or OS Translator?
Engine Miles ships an update every 3 days, and OS Translator every 8 days. Most recently, Engine Miles was updated on November 10, 2026 and OS Translator on November 6, 2026.

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