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Best alternatives to Lookup Definitions Online (2026)

10 Chrome extensions that do a similar job to Lookup Definitions Online, closest first. Each shows real store users, its rating, how recently it was updated and how many permissions it asks for.

Lookup Definitions Online: reviews, users and permissionsBest Education extensions

Lookup Definitions Online today

≈5K users4.6★ from 86 ratingsNot updated for 2+ years4 permissions

Lookup Definitions Online alternatives, compared

  1. 1

    Definitions.net

    Get instant dictionary definitions for any word or term that hits you anywhere on the web!

    ≈3K users4.9★ from 10 ratingsUpdated 23 months ago4 permissions
    • About 1.7× fewer users than Lookup Definitions Online
    • Updated more recently
    • Listed under Tools
    Compare side by side
  2. 2

    Lookup Word in Dictionary

    Looks up the selected text on a world famous online dictionary.

    ≈9K users4.3★ from 85 ratingsUpdated 20 months ago4 permissions
    • About 1.8× more users than Lookup Definitions Online
    • Rated 0.2 stars lower
    • Updated more recently
    • Listed under Tools
    Lookup Word in Dictionary alternativesCompare side by side
  3. 3

    English-to-English Definitions - Merriam-Webster Dictionary

    Find precise English-to-English definitions effortlessly and for free with this intuitive dictionary extension.

    ≈50K users4.5★ from 115 ratingsUpdated 10 months ago2 permissions
    • About 10× more users than Lookup Definitions Online
    • Updated more recently
    • Asks for fewer permissions (2 vs 4)
    • Listed under Tools
    English-to-English Definitions alternativesCompare side by side
  4. 4

    Oxford Dictionary Lookup

    Looks up the selected text on Oxford Learner's Dictionaries

    ≈10K users4.8★ from 33 ratingsUpdated 17 months ago2 permissions
    • About 2.0× more users than Lookup Definitions Online
    • Updated more recently
    • Asks for fewer permissions (2 vs 4)
    Oxford Dictionary Lookup alternativesCompare side by side
  5. 5

    Cambridge Dictionary Lookup

    Looks up the selected text on Cambridge Dictionary

    ≈20K users4.7★ from 63 ratingsUpdated 17 months ago2 permissions
    • About 4.0× more users than Lookup Definitions Online
    • Updated more recently
    • Asks for fewer permissions (2 vs 4)
    Cambridge Dictionary Lookup alternativesCompare side by side
  6. 6

    LSJ Ancient Greek Lookup

    Look up on lsj.gr, multiple Ancient Greek and Latin dictionaries with ALT+double click on a word.

    ≈1K users4.5★ from 2 ratingsUpdated 18 months ago5 permissions
    • About 5.0× fewer users than Lookup Definitions Online
    • Updated more recently
    • Asks for more permissions (5 vs 4)
    • Listed under Tools
    Compare side by side
  7. 7

    Dictionary, Thesaurus & Reference

    Quick access to reference pages on thefreedictionary.com and freethesaurus.com.

    ≈10K users4.1★ from 27 ratingsUpdated 7 months ago4 permissions
    • About 2.0× more users than Lookup Definitions Online
    • Rated 0.4 stars lower
    • Updated more recently
    • Listed under Tools
    Dictionary, Thesaurus & Reference alternativesCompare side by side
  8. 8

    Longman Dictionary Bubble

    Search a definition from Longman Dictionary of Contemporary English (5th edition)

    ≈3K users3.9★ from 24 ratingsUpdated 3 weeks ago5 permissions
    • About 1.7× fewer users than Lookup Definitions Online
    • Rated 0.7 stars lower
    • Updated more recently
    • Asks for more permissions (5 vs 4)
    • Listed under Workflow & Planning
    Compare side by side
  9. 9

    Tureng Dictionary

    Tureng English-Turkish Online Dictionary

    ≈40K users3.8★ from 357 ratingsUpdated 9 months ago7 permissions
    • About 8.0× more users than Lookup Definitions Online
    • Rated 0.8 stars lower
    • Updated more recently
    • Asks for more permissions (7 vs 4)
    • Listed under Workflow & Planning
    Tureng Dictionary alternativesCompare side by side
  10. 10

    Google Dictionary (by Google)

    View definitions easily as you browse the web.

    ≈4M users3.8★ from 13.7K ratingsUpdated 9 months ago1 permissions
    • About 800× more users than Lookup Definitions Online
    • Rated 0.8 stars lower
    • Updated more recently
    • Asks for fewer permissions (1 vs 4)
    • Listed under Tools
    Google Dictionary (by Google) alternativesCompare side by side

Lookup Definitions Online alternatives: questions

What is the best alternative to Lookup Definitions Online?

By users, the most popular alternative is Google Dictionary (by Google) with ≈4M users and a 3.8-star rating. The closest match by what it does is Definitions.net.

Which Lookup Definitions Online alternative has the best rating?

Cambridge Dictionary Lookup has the highest rating of these alternatives with 50+ ratings: 4.7 out of 5 from 63 ratings.

Is there a Lookup Definitions Online alternative that asks for fewer permissions?

Google Dictionary (by Google) asks for 1 permissions, against 4 for Lookup Definitions Online.

How many alternatives to Lookup Definitions Online are there?

We list 10 close alternatives to Lookup Definitions Online on the Chrome Web Store, picked by what they do and ranked by how close they are.

Users and ratings are the figures shown on the Chrome Web Store, re-checked continuously. Alternatives are matched on name, description, category and topic. Browse best-of lists by niche.