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Best 4Base Converter Apps

201+ iOS apps curated and reviewed

4.4 avg rating
18 free apps
Updated June 2026

With an average user rating of 4.4β˜…, the 4base converter category is one of the App Store's strongest. Browse all 201+ apps we track, sorted so the most loved ones surface first.

Compare top 4Base Converter Apps (June 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
14Base Converter4Base ConverterFreeβ€”NoNoMay 2026
2Convertible: Unit ConverterConvertible: Unit ConverterFree4.8β˜… (97)NoNoJul 2026
3Fancy Units ConverterFancy Units ConverterFree4.7β˜… (1.6K)YesYesJul 2026
4The Video ConverterThe Video ConverterFree4.5β˜… (9.7K)NoYesJul 2026
5Units - Pro Unit ConverterUnits - Pro Unit ConverterFree3.6β˜… (150)YesYesJul 2026
6The Audio ConverterThe Audio ConverterFree4.6β˜… (13K)NoYesJul 2026
7Unit Converter HD.Unit Converter HD.Free4.7β˜… (642)YesYesMay 2026
8Convert Any Unit LiteConvert Any Unit LiteFree4.7β˜… (47K)YesNoJul 2026

Top Picks for 4Base Converter

Convertible: Unit Converter#2

Convertible: Unit Converter by Efecto Pty Ltd

Currency and Unit Converter
Strong Contender
πŸ”§ Utilities
4.8😊(97 ratings)
Free
Convertible: Unit Converter screenshot 1
Convertible: Unit Converter screenshot 2
Convertible: Unit Converter screenshot 3
Convertible: Unit Converter screenshot 4
Convertible: Unit Converter screenshot 5
Convertible: Unit Converter screenshot 6

This app offers a comprehensive unit and currency conversion tool with a visually appealing interface and extensive unit options. It supports standard and non-standard units, compound conversions, and fraction input, making it versatile for various needs.

What We Love

  • πŸ’» Excellent user interface
  • βš™οΈ Comprehensive set of conversion units
  • πŸ” Intuitive and easy to use
  • 🎨 Customizable color themes

Room to Improve

  • πŸ› Occasional crashes or bugs
  • πŸ” Navigation can be confusing at times
  • πŸ”’ Lack of support for custom units
Fancy Units Converter#3

Fancy Units Converter by Ievgenii Lebid

Currency and Unit Converter
Worth Considering
πŸ”§ Utilities
4.7😐(1.6K ratings)
FreeAdsIn-App Purchases
Fancy Units Converter screenshot 1
Fancy Units Converter screenshot 2
Fancy Units Converter screenshot 3
Fancy Units Converter screenshot 4
Fancy Units Converter screenshot 5
Fancy Units Converter screenshot 6

This app offers a fast and user-friendly way to convert units and currencies. Customize your conversion lists and get instant results as you type, with support for over 350 units and 160 currencies. It also includes a built-in calculator and offline currency data.

What We Love

  • πŸ‘ Simple and intuitive UI
  • πŸš€ Quick conversions
  • πŸ’‘ Customizable units
  • 🌟 Aesthetically pleasing design

Room to Improve

  • πŸ”’ Essential units locked behind paywall
  • πŸ› Occasional crashes and bugs
  • πŸ“΅ Ads in free version

More 4Base Converter apps to explore

4
The Video Converter
The Video Converter
The Video Converter
Convert to MP4, MOV, and MP3
Free

Easily transform video and audio files into a wide range of formats like MP4, MOV, and MP3. Select your input, choose an output, and convert in seconds. Save, share, or view your converted files directly from the app.

Convert to MP4, MOV, MP3, and moreSupports dozens of input and output formatsFast conversion in seconds
πŸ”§ Utilities
(9.7K)
freemium
5
Units - Pro Unit Converter
Units - Pro Unit Converter
Units - Pro Unit Converter
by Homegrown Software Ltd
Free

Easily convert between hundreds of units across 43 categories, including currency with daily updated rates. Customize your workflow by hiding or reordering units and categories.

Hundreds of units across 43 categoriesDaily updated currency exchange ratesHide unused units
πŸ”§ Utilities
(150)
free with in-app purchases
6
The Audio Converter
The Audio Converter
The Audio Converter
Convert to MP3, WAV, M4A, AAC
Free

Easily transform audio and video files into various popular audio formats like MP3, WAV, and M4A. Supports dozens of input formats and offers quick, cloud-based or local conversions. Save, share, or listen to your converted files directly from the app.

Convert audio/video to MP3, WAV, M4A, AAC, FLAC, OGG, WMA, AIFFSupports dozens of input formats (MOV, MP4, WMA, etc.)Fast cloud-based conversions
πŸ”§ Utilities
(13K)
free with in-app purchases
7
Unit Converter HD.
Unit Converter HD.
Unit Converter HD.
30 categories, 700+ units
Free

Easily convert over 700 units across 30 categories with this powerful tool. It offers a user-friendly interface, dark mode support, and a backspace key for quick corrections. Save time on all your measurement conversion needs.

700+ Units of Measure30 Conversion CategoriesEasy-to-Use Interface
πŸ”§ Utilities
(642)
free with in-app purchases
8
Convert Any Unit Lite
Convert Any Unit Lite
Convert Any Unit Lite
Units & Currency Converter
Free

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.

Intelligent unit search with autocompleteAutomatic category selectionIntegrated calculator
✈️ Travel
(47K)
ad-supported
9
Unit Converter: Mila's Tools
Unit Converter: Mila's Tools
Unit Converter: Mila's Tools
Metric Conversion Calculator +
Free

This app offers a comprehensive unit conversion tool with over 300 units across 27 categories. It supports compound units, date calculations, and conversions between various number systems, including historical units. The interface is designed for ease of use with smart keyboards and customizable display options.

27 conversion categories300+ unitsCompound unit support
πŸ”§ Utilities
(1.4K)
free with in-app purchases
10
Unit Converter ∞
Unit Converter ∞
Unit Converter ∞
The Best Unit Converter
$2.99

This app offers a comprehensive unit conversion experience with a vast database of over 1000 units across 50 categories. It supports mixed units, custom unit creation, and provides a unique, visually appealing interface for all your conversion needs.

50+ Categories & 1000+ UnitsCreate your own unitMixed-unit Support
πŸ”§ Utilities
(242)
free
11
myConvert Lite
myConvert Lite
myConvert Lite
Currency and units converter
Free

Convert currencies and units quickly and efficiently on a single screen. This free version offers essential conversion tools with a built-in calculator and natural language search. Upgrade to the full version for expanded unit options and an ad-free experience.

Multiple results displayed simultaneouslyIntegrated calculator keyboardHandles complex unit conversions
πŸ” Reference
(4)
free with in-app purchases
12
Converter-Universal Conversion
Converter-Universal Conversion
Converter-Universal Conversion
by Trelleborg Sealing Solutions
Free

This app offers a comprehensive unit and hardness conversion tool with an easy-to-use interface. It includes currency conversion with updated exchange rates, over 300 engineering and scientific units, and a specialized hardness converter. Additional features like timezone conversion, pace calculation, and a standard calculator enhance its utility.

Currency converter with live exchange ratesOver 300 engineering and scientific unitsSpecialized hardness converter
πŸ”§ Utilities
(897)
free
13
Ad-Free Unit Converter
Ad-Free Unit Converter
Ad-Free Unit Converter
by William Jockusch
Free

A straightforward unit converter designed for ease of use and efficiency. It offers a wide range of conversion options without any advertisements, saving battery and data. All conversions are performed on a single, intuitive screen.

Ad-free experienceIntuitive single-screen interfaceSupports acceleration, angle, area, density, distance, energy, force, mass, power, pressure, speed, temperature, time, and volume
πŸ”§ Utilities
(54)
free with in-app purchases
14
Unit Converter | Converter4U
Unit Converter | Converter4U
Unit Converter | Converter4U
Student Traveler Cook and DIY
Free
$0.99 | 100% OFF

This app provides a powerful and intuitive way to convert between a wide range of units, including length, weight, temperature, and more. It offers simultaneous conversion of multiple units and customizable options for a personalized experience. Get instant, accurate results for all your conversion needs.

Simultaneous multi-unit conversionCustomizable unit optionsCopy converted values to clipboard
πŸ“Š Productivity
(193)
free
15
Audio Converter: μŒμ›μΆ”μΆœ, λ²¨μ†Œλ¦¬ 메이컀
Audio Converter: μŒμ›μΆ”μΆœ, λ²¨μ†Œλ¦¬ 메이컀
Audio Converter: μŒμ›μΆ”μΆœ, λ²¨μ†Œλ¦¬ 메이컀
Mp3 λ³€ν™˜κΈ°, mp4 λ³€ν™˜: Media to mp3
Free

Easily convert audio files and create custom ringtones with this versatile tool. It supports a wide range of formats and allows for batch conversions and quality control of your audio tracks.

Batch audio conversionConvert audio from videoSupports mp3, mp4, wav, flac, and more
🎡 Music
(49)
free with in-app purchases
16
Audio Converter - MP4 to MP3
Audio Converter - MP4 to MP3
Audio Converter - MP4 to MP3
Convert video to mp3
Free

Easily convert media files into various audio formats. Supports batch conversion and advanced audio settings for flexible audio extraction from both audio and video files.

Convert video to audioSupport for multiple audio formatsBatch conversion
πŸ”§ Utilities
(1.1K)
freemium
17
Convert Any Unit
Convert Any Unit
Convert Any Unit
Units & Currency Converter
$9.99

This app offers a fast and intuitive way to convert between thousands of units and currencies. Simply type to search and select units, with automatic category detection and intelligent suggestions. It includes advanced features like a built-in calculator and bookmark organization.

Fast unit conversion with autocompleteIntelligent search for unitsAutomatic category selection
✈️ Travel
(5.1K)
free
18
Hex Base Converter
Hex Base Converter
Hex Base Converter
by Mark Raymond
Free

Easily convert numbers between decimal, hexadecimal, binary, and octal formats. This versatile tool offers an intuitive interface and automatically corrects incorrect entries for a seamless user experience.

Decimal to Hex, Binary, Octal conversionHexadecimal to Dec, Binary, Octal conversionOctal to Dec, Binary, Hex conversion
πŸ“š Education
(44)
free
19
gUnit Lite - Free Currency & Unit Converter (Conversion)
gUnit Lite - Free Currency & Unit Converter (Conversion)
gUnit Lite - Free Currency & Unit Converter (Conversion)
by Axonic Labs LLC
Free

This free app offers lightning-fast unit and currency conversions with an ultra-sleek design. Easily convert essential units and currencies with just a few taps, making it a delightful and efficient tool for your iOS device.

Fastest unit and currency converterQuick search and conversionConfigure units, categories, and favorites
πŸ”§ Utilities
(70)
free
20
Catalytic Converter Database
Catalytic Converter Database
Catalytic Converter Database
Catalytic Converter Guide
Free

Access a comprehensive database of catalytic converters with real-time pricing based on XRF values. Browse by manufacturer or code, view high-quality images, and stay updated with daily additions and market rate changes.

Real-time pricing updated every 15 minutesDaily additions of new convertersAdvanced search by serial number or code
πŸ” Reference
(20)
free with in-app purchases

FAQ about 4Base Converter

Are there free 4base converter apps for iPhone?
Yes β€” 18 of the top 4base converter apps we rank are free to download, including 4Base Converter and Convertible: Unit Converter.
4Base Converter has no ads and has no in-app purchases, according to its App Store listing as of June 2026.
We track 201+ 4base converter apps on the iOS App Store as of June 2026, ranked by rating, recency, and analysis of real user reviews.