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Best Free Unit Converter Apps

248+ iOS apps curated and reviewed

4.2 avg rating
20 free apps
Updated October 2026

From beginner-friendly picks to power-user tools, our free unit converter list covers 248+ iPhone apps updated through October 2026. Compare ratings, prices, and screenshots in one place.

Compare top Free Unit Converter Apps (October 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1Unit Converter - Best Unit AppUnit Converter - Best Unit AppFree4.8★ (193K)YesYesOct 2026
2Convert Any Unit LiteConvert Any Unit LiteFree4.7★ (48K)YesNoOct 2026
3Unit Converter - US UnitsUnit Converter - US UnitsFree—YesNoAug 2026
4Unit Converter - Pro Units AppUnit Converter - Pro Units AppFree4.6★ (16K)NoYesOct 2026
5CONVERT UNITSCONVERT UNITSFree4.7★ (1.4K)YesYesOct 2026
6Converter: all unit converterConverter: all unit converterFree—NoNoMay 2026
7Unit Converter - Convert allUnit Converter - Convert allFree4.6★ (14K)YesYesOct 2026
8Unit Converter Pro: UniversalUnit Converter Pro: UniversalFree—YesNoJul 2026

Top Picks for Free Unit Converter

Unit Converter - Best Unit App#1

Unit Converter - Best Unit App by Alan Mrvica

Convert All Units and Currency
Editor's Choice
✈ī¸ Travel
4.8😊(193K ratings)
FreeAdsIn-App Purchases
#92in Travel
Unit Converter - Best Unit App screenshot 1
Unit Converter - Best Unit App screenshot 2
Unit Converter - Best Unit App screenshot 3
Unit Converter - Best Unit App screenshot 4
Unit Converter - Best Unit App screenshot 5
Unit Converter - Best Unit App screenshot 6

Easily convert between a wide range of units across 20 categories, including length, weight, temperature, and more. Features live currency updates for 155 world currencies, refreshed daily. Designed for simplicity and visual appeal.

What We Love

  • 🚀 Easy to use
  • 👍 Comprehensive conversions
  • 💡 Useful for travel and cooking
  • 🚀 Quick and efficient
  • 👍 Intuitive interface

Room to Improve

  • 🐛 Limited character input
  • 🐛 Difficulty with negative numbers
  • 💡 Lack of ability to quickly switch between conversions
  • 💰 Pro version not worth the cost
Convert Any Unit Lite#2

Convert Any Unit Lite by Cider Software LLC

Units & Currency Converter
Strong Contender
✈ī¸ Travel
4.7😊(48K ratings)
FreeAds
Convert Any Unit Lite screenshot 1
Convert Any Unit Lite screenshot 2
Convert Any Unit Lite screenshot 3
Convert Any Unit Lite screenshot 4
Convert Any Unit Lite screenshot 5

Quickly convert between thousands of units with an intelligent search and autocomplete feature. This app offers a streamlined interface, an integrated calculator, and the ability to save favorite conversions. It supports over 6,400 units across 51 categories, making it a comprehensive tool for all your conversion needs.

What We Love

  • 👍 Easy to use
  • 🚀 Comprehensive unit conversions
  • 💡 Allows custom unit creation
  • 🔧 Useful for cooking, travel, and work
  • 🔍 Intuitive and straightforward interface

Room to Improve

  • 🔍 Too many unit options can be overwhelming
  • 🔍 Ads can be intrusive and disrupt usage
  • 🐛 Occasional bugs and freezing issues
  • 🔋 High ad frequency drains battery quickly

More Free Unit Converter apps to explore

FAQ about Free Unit Converter

What are the best free unit converter apps for iPhone?
Unit Converter - Best Unit App tops our free unit converter apps ranking as of October 2026, with a 4.8-star average from 193K App Store ratings, and it's free to download.
Unit Converter - Best Unit App shows ads and offers in-app purchases, according to its App Store listing as of October 2026.
We track 248+ free unit converter apps on the iOS App Store as of October 2026, ranked by rating, recency, and analysis of real user reviews.

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