Comparison

Idioms and Slang Dictionary vs Deep Dictionary

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

Head to head
About

Idioms and Slang Dictionary

Explore the meanings and origins of over 61,000 idioms, slang terms, proverbs, and expressions. Understand conversational English like a native speaker with definitions, historical context, and example sentences.

Highlights
  • Definitions from top sources
  • History and origin of phrases
  • Example sentences
  • Voice search
  • Audio pronunciations
  • Bookmark favorite phrases
  • Advanced search options
Features
Read full description

Idioms and Slang Dictionary by Farlex gives you definitions and examples from top sources like McGraw-Hill and Houghton Mifflin for more than 61,000 terms, including: Idioms Slang terms Verbal phrases Abbreviations Proverbs Clichés Regionalisms Colloquialisms Expressions Sayings and more! Get clear, in-depth definitions of tens of thousands of idioms used in the US and throughout English-speaking world. You say them every day, but do you know where they come from? Get the history behind the phrase. FEATURES * Search by keyword or full phrase and always find what you're looking for. * View multiple example sentences to see how an idiom is used in everyday speech. * Get the history behind the phrase. Find out when and where an idiom originated. * Use native voice search to look up a word or phrase just by saying it. (With supported devices) * Play 13,000+ audio pronunciations of keywords for both American and British speakers in online mode. * Learning English? To sound like a native speaker, you need to know idioms! Master conversational English with this free resource. * Add unlimited bookmarks and build your vocabulary. * View your recent searches. * See search suggestions as you type. * Perform advanced searches, including "Starts with," "Ends with," "Contains," and "Wildcard." * Share your favorite phrases via social networks, email, and text. (With supported devices) * This is NOT a preview or a trial version, and there is no "locked" content. Open the app and immediately access all content, no subscriptions required! * User-friendly, comprehensive, and authoritative: the perfect free Idioms and Slang Dictionary for new English speakers or anyone curious about the English language! Here's a sneak-peak of what you'll find inside: let the cat out of the bag Give away a secret, as in "Mom let the cat out of the bag and told us Karen was engaged." This expression alludes to the dishonest practice of a merchant substituting a worthless cat for a valuable pig, which is discovered only when the buyer gets home and opens the bag. [Mid-1700s] silver lining An element of hope or a redeeming quality in an otherwise bad situation, as in "The rally had a disappointing turnout, but the silver lining was that those who came pledged a great deal of money." This metaphoric term is a shortening of "Every cloud has a silver lining," in turn derived from John Milton's Comus (1634): "A sable cloud turns forth its silver lining on the night." a picture is worth a thousand words A graphic illustration conveys a stronger message than words, as in "The book jacket is a big selling point—one picture is worth a thousand words." This saying was invented by an advertising executive, Fred R. Barnard. To promote his agency's ads he took out an ad in Printer's Ink in 1921 with the headline "One Look Is Worth a Thousand Words" and attributed it to an ancient Japanese philosopher. Six years later he changed it to "Chinese Proverb: One Picture Is Worth Ten Thousand Words," illustrated with some Chinese characters. The attribution in both was invented; Barnard simply believed an Asian origin would give it more credibility. Download now for free and get instant access to content you won't find anywhere else! How do we do it? TheFreeDictionary.com - Farlex apps have been downloaded tens of millions times across multiple platforms, with top ratings after hundreds of thousands of reviews. We work with the best publishers to bring together trusted content in the most comprehensive, authoritative dictionary apps on the market. Our flagship app is The Free Dictionary (TFD), powered by TheFreeDictionary.com. Find our other apps by searching "Dictionary by Farlex" in the App Store.

About

Deep Dictionary

Access definitions from various sources like Wikipedia and Urban Dictionary, with multilingual support and pronunciation guides. Enhance your vocabulary with synonyms, related words, and real-life usage examples.

Highlights
  • Multilingual definitions
  • Urban Dictionary slang integration
  • Wikipedia content access
  • Pronunciation guides and usage examples
  • Comprehensive thesaurus
  • Images and contextual phrases
Features
Read full description

Deep Dictionary is a powerful English dictionary designed to help you understand words, explore their meanings, and build your vocabulary. It is like Wikipedia, Urban Dictionary, Oxford English Dictionary, and Youglish all in one App! Deep Dictionary supports multiple languages! Get definitions in Japanese, Chinese, Russian, German, Spanish, and French alongside English. The best multilingual dictionary for learning and translation—perfect for English-Japanese dictionary, English-Chinese dictionary, English-Russian dictionary, English-German dictionary, English-Spanish dictionary, and English-French dictionary! With direct integration with Urban Dictionary, you'll never miss the latest slang and expressions. Our app ensures you stay updated with contemporary language trends, capturing the essence of the latest terms just like Urban Dictionary. Like YouGlish, our app offers pronunciation guides and real-life usage examples through integrated YouTube clips. Need scientific definitions? Our app connects you to comprehensive Wikipedia entries. For dictionary definitions, Deep Dictionary includes images and contextual phrases to make vocabulary building a breeze. Download now to enhance your vocabulary with the best of both traditional and contemporary language tools. Download the Deep Dictionary app for free and start your English learning right away. ## KEY FEATURES: ## Thesaurus: Deep Dictionary is more than just a dictionary—it's a comprehensive thesaurus at your fingertips. Unlike traditional thesaurus apps that focus solely on synonyms and antonyms, Deep Dictionary broadens your vocabulary with a wide range of related words that are more practical for everyday use. Whether you’re writing, studying, or simply want to expand your vocabulary, our thesaurus feature offers tools that go beyond just finding synonyms and antonyms. Discover new words and enhance your language skills with Deep Dictionary’s unique approach to the thesaurus! ## Wikipedia: Deep Dictionary includes direct references to authentic Wikipedia content, wrapped in an improved, user-friendly interface. Now you can access reliable Wikipedia information. Whether you’re a student, a professional, or simply curious, Deep Dictionary provides a seamless Wikipedia-like experience for all things related to words and their meanings. ## Reliable Sources: Looking for an alternative to Dictionary.com? Deep Dictionary provides everything you need, from detailed definitions to pronunciation guides, much like Dictionary.com. With features similar to Dictionary.com, Deep Dictionary helps you explore the English language with ease. If you love Dictionary.com, you'll find Deep Dictionary an equally valuable resource for learning and mastering English. And what's better? Deep Dictionary doesn't have Ads to interrupt your learning experience. ## Pick Up Slangs like Urban Dictionary: Stay updated with the latest trends in language. Our direct integration with Urban Dictionary ensures you’re never out of the loop with contemporary and evolving terms. When you prefer, jump over to the Urban Dictionary website to explore more with one simple tap! ## Best Youglish Alternative on iOS: iPhone users have long sought a good YouGlish substitute, and now you've found it! Deep Dictionary offers pronunciation guides and real-life usage examples. ## Academic: Inspired by the Oxford English Dictionary, Deep Dictionary offers a wealth of detailed definitions and historical contexts, just like the Oxford English Dictionary. Dive into the depths of the English language with a dictionary that mirrors the comprehensive nature of the Oxford English Dictionary. Whether you’re studying or just curious about words, our app provides the insights you need, much like the Oxford English Dictionary.

Screenshots

Idioms and Slang Dictionary4 screens
Deep Dictionary4 screens

Verdict

The call

The clearest difference is in-app purchases: Deep Dictionary at none against Idioms and Slang Dictionary's 1. Deep Dictionary also leads on update cadence (weekly vs every 17 months). Idioms and Slang Dictionary's advantage is ratings volume (1.1K vs 51) and device support (3 vs 1). On price, rating, review sentiment and ads 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. Idioms and Slang Dictionary sells 1 one-off in-app purchase. Deep Dictionary asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.7 for Idioms and Slang Dictionary against 4.7 for Deep Dictionary. That said, the two scores are not equally well evidenced: Idioms and Slang Dictionary has 1.1K ratings behind it against 51, so its average is the more settled of the two. Written reviews are what separate them: 83% of Idioms and Slang Dictionary's written reviews are positive against 78% of Deep Dictionary's.

UpkeepUpdate frequency

Idioms and Slang Dictionary ships an update every 17 months, Deep Dictionary weekly. The most recent releases landed on October 26, 2026 and October 25, 2026 respectively.

Scorecard5 real differences · 5 level
Idioms and Slang Dictionary versus Deep Dictionary: the parameters behind the verdict, then further details
ParameterIdioms and Slang DictionaryDeep Dictionary
PriceFreeFree
Rating4.7 (1.1K ratings) — better4.7 (51 ratings)
Positive reviews82.9% of reviews — better77.8% of reviews
Number of ratings1.1K — better51
Update frequencyEvery 17 monthsWeekly — better
AdsYesYes
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesAd-supported — better
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS15.0 — better16.0
Further details — not scored
Size96 MB11 MB
Age rating12+12+
DeveloperFarlex, Inc.DEEPCO

Customer experience

Idioms and Slang Dictionary

All ratings1,106 ratings
Positive93.7%
Neutral3.5%
Negative2.8%
Written reviews105 reviews
Positive82.9%
Neutral6.7%
Negative10.5%

Deep Dictionary

All ratings51 ratings
Positive92.2%
Neutral3.9%
Negative3.9%
Written reviews9 reviews
Positive77.8%
Neutral0.0%
Negative22.2%

Bugs and requests

Idioms and Slang Dictionary

Reported bugs

2 issues
  • Offline mode issues causing the app to go offline frequently
  • Bookmarks/favorites not saving properly across device resets

Requested features

5 requests
  • Provide translations of idiom definitions in other languages
  • Add audio functionality to help with pronunciation
  • Improve navigation and browsing experience
  • Sync favorites across devices
  • Categorize and list commonly used idioms and slang

Deep Dictionary

Not enough reviews yet to summarise bugs or requests.

In-app purchases

1 purchases

Idioms and Slang Dictionary

One-time1
  • Ad-free upgrade$4.99
None

Deep Dictionary

No in-app purchases

Questions

Is Idioms and Slang Dictionary free?
Idioms and Slang Dictionary is free to download, with in-app purchases available.
Is Deep Dictionary free?
Deep Dictionary is free to download, with no in-app purchases.
Which has better reviews, Idioms and Slang Dictionary or Deep Dictionary?
Idioms and Slang Dictionary is rated higher. Idioms and Slang Dictionary averages 4.7 out of 5 from 1.1K ratings, while Deep Dictionary averages 4.7 from 51 ratings.
Do Idioms and Slang Dictionary or Deep Dictionary have ads?
Both Idioms and Slang Dictionary and Deep Dictionary show ads.
Which is updated more often, Idioms and Slang Dictionary or Deep Dictionary?
Idioms and Slang Dictionary ships an update every 17 months, and Deep Dictionary weekly. Most recently, Idioms and Slang Dictionary was updated on October 26, 2026 and Deep Dictionary on October 25, 2026.

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