Wordtune
Rewrites the sentence you already wrote, everywhere you write it
Wordtune is an AI writing assistant from AI21 Labs that rewrites sentences you have already written into alternative phrasings, switches between casual and formal tone, shortens or expands text, summarizes documents, articles, web pages, and YouTube videos, checks grammar, and humanizes AI-generated text, working through Chrome and Edge extensions, an iOS app, and a web editor, with a free plan and paid tiers starting at $4.89 per month billed annually.
Overview
Wordtune sits at the opposite end of this category from the article generators. It does not want a topic and a keyword; it wants the sentence you just wrote and offers you five better versions of it. That distinction matters more than it sounds, because it changes who the product is for. Generators serve people facing a blank page. Wordtune serves people who write constantly and are dissatisfied with how their writing lands, which in practice is a very large population of non-native English speakers, academics, consultants, and anyone whose job is email.
The company behind it is more interesting than the product's modest price suggests. Wordtune is built by AI21 Labs, the Israeli research lab founded in 2017 by Yoav Shoham, Ori Goshen, and Amnon Shashua, one of the few independent foundation-model companies of its generation. AI21 built its own language models and Wordtune was the consumer showcase, launched in 2020, which is why the rewriting quality was noticeably better than the template tools of that era.
That heritage is now also the main risk. AI21 has spent recent years pushing into enterprise agent products, its confirmed funding stops at a 2023 Series C extension, a reported $300M round did not close, and there has been visible strategic churn. Wordtune remains live, priced, and self-serve, with the site copyright still reading 2025 and mobile and extension distribution intact, but it is plainly not the company's center of gravity any more. Buyers should treat it as a stable utility rather than a product with an ambitious roadmap.
Pricing is the friendliest in the category. There is a real free plan with ten rewrites a day, Advanced at $6.99 monthly or $4.89 annually, and Unlimited at $9.99 monthly or $6.99 annually, plus a 30 percent discount for students, educators, and nonprofit staff. At those prices the question is not whether Wordtune is worth it, but whether rewriting is the problem you have.
Best for
Non-native English writers, consultants, academics, students, and anyone whose day is email and documents, who already writes plenty and wants it to read better, at a price low enough that the decision does not need a business case.
Not the right fit for
- Anyone who needs content generated from a brief; Wordtune improves text that exists and is close to useless when you have nothing on the page yet.
- SEO and content marketing teams; there is no keyword research, no SERP grounding, no publishing, no bulk generation, and no article workflow of any kind.
- Teams needing brand governance; there is no brand voice training, no style guide enforcement, no knowledge base, and no shared workspace of consequence.
- Writers working primarily in languages other than English; Wordtune writes in English only and translates from a set of other languages into English rather than working natively in them.
- Buyers who need confidence in long-term roadmap investment; AI21 Labs has clearly redirected toward enterprise agent products and Wordtune shows the signs of a maintained rather than actively developed product.
How it works
- 1
You install the Chrome or Edge extension, or the iOS app, or open the web editor. The extension is the primary surface, because Wordtune is designed to work inside Gmail, Google Docs, LinkedIn, Slack, your CMS, and any other web text field rather than asking you to write somewhere else and paste.
- 2
You highlight a sentence you have written and Wordtune returns alternative phrasings that preserve the meaning. You can constrain the rewrite to casual or formal, or to shorter or longer, which is the single most-used control in the product because it maps onto a real editorial decision rather than an abstract style setting.
- 3
Beyond rewriting, contextual tools extend what you have written: continue a thought, elaborate on a point, add a counterargument, explain a concept, emphasize a claim, or write a conclusion. A smart synonym generator handles single-word replacements, and a grammar and spelling checker runs continuously underneath.
- 4
The reading side is separate and underrated. Wordtune summarizes documents, articles, web pages, and YouTube videos, which turns it into a research aid rather than only an output tool. The AI humanizer rewrites machine-generated text into a less obviously synthetic register, which is a feature the category rarely discusses openly and which Wordtune sells directly.
Feature breakdown
23 features in 5 modulesRewriting and tone
The core mechanic, and still the best implementation of it.- Sentence rewrite
- Highlight any sentence and get multiple alternative phrasings that preserve meaning. This is the feature that built the product's reputation and it remains sharper than the equivalent in general-purpose assistants.
- Casual and formal switching
- One-click register change, which maps directly onto a real decision writers make constantly and is faster than describing the change in a prompt.
- Shorten and expand
- Compresses a sentence to fit a character limit or extends it to carry more nuance, without you rewriting from scratch.
- Smart synonym generator
- Context-aware single-word replacement that accounts for the surrounding sentence rather than offering a thesaurus list.
- Daily rewrite allowances
- Ten rewrites and AI suggestions a day on Basic, thirty a day on Advanced, unlimited on the Unlimited tier. The daily rather than monthly meter is unusual and suits bursty writing.
Contextual writing tools
Extending a thought rather than rephrasing it.- Continue writing
- Picks up where you stopped mid-thought, aimed at writer's block rather than at drafting whole pieces from a brief.
- Elaborate and explain
- Expands a claim with supporting detail or explains a concept inline, which is the most-used tool for people writing technical or instructional material.
- Counterargument
- Generates an opposing viewpoint to a stated position, genuinely useful for argumentative and academic writing and rare among competitors.
- Emphasize and conclude
- Strengthens a point or produces a closing paragraph consistent with what came before.
- Grammar and spelling checker
- Continuous proofreading underneath everything else, unlimited on every plan including free.
Reading and summarization
The half of the product most buyers overlook.- Document and article summarization
- Condenses long documents, articles, and web pages into readable summaries, which makes Wordtune a research aid rather than only an output tool.
- YouTube video summarization
- Summarizes video content, which is a meaningful shortcut for anyone researching from conference talks, tutorials, or competitor webinars.
- Summarization allowances
- Three summaries a month on Basic and fifteen on Advanced, unlimited on the top tier. The free allowance is tight enough to be a demo rather than a working tool.
- Source verification approach
- AI21 states that Wordtune checks at least five sources before treating information as credible when providing factual assistance, which is a stronger grounding posture than most tools in this category advertise.
- Translate into English
- Translates from Spanish, Mandarin, Arabic, Hindi, Korean, Hebrew, Russian, German, French, and Portuguese into English, which is precisely the workflow of the non-native writer this product serves best.
Distribution and platform
Being everywhere you already type is the whole distribution strategy.- Chrome extension
- The primary surface, working in Gmail, Google Docs, LinkedIn, CMS editors, and effectively any web text field.
- Microsoft Edge extension
- Same capability for Edge users, which matters more in corporate environments than vendors usually acknowledge.
- iOS application
- Mobile writing assistance for email and messaging on the phone, where rewriting is arguably more valuable because typing is harder.
- Web editor
- A standalone writing surface for people who prefer to draft in a dedicated space rather than in a browser text field.
- Wordtune for business
- A team-oriented offering exists alongside the consumer plans, though the individual tiers are where the published self-serve pricing lives.
AI text handling
The feature the category talks around and Wordtune states plainly.- AI humanizer
- Rewrites machine-generated text into a less obviously synthetic register. Wordtune markets this directly rather than burying it, which is more honest than competitors who imply the same outcome without naming it.
- Detection posture
- Wordtune does not claim its humanizer defeats any specific AI detector, and no vendor in this category can credibly make that claim as detectors change constantly. Treat it as a readability improvement, not a guarantee.
- English-only output
- All writing assistance is produced in English regardless of the source language, a deliberate scope limit that keeps quality high in one language rather than mediocre across forty.
Use cases
4 documentedNon-native English speaker in a client-facing role
The substance of every email is right but the phrasing reads stiff or slightly off, and rewriting each message by hand costs twenty minutes a day.
Rewriting inside Gmail turns awkward sentences into natural ones without changing the meaning, and translation into English handles the cases where thinking happens in another language first.
Consultant writing proposals and reports
Draft material is technically accurate and tonally uneven, swinging between overly casual and needlessly formal across sections written on different days.
Formal and casual switching evens out register across a document, shorten trims bloated paragraphs to fit page constraints, and summarization compresses research inputs before writing begins.
Student or academic writing argumentative work
An essay needs stronger phrasing, an opposing viewpoint addressed, and thirty pages of source material digested before any of it can be written.
The counterargument tool surfaces the objection to address, summarization handles the reading pile including video lectures, and the 30 percent education discount takes the cost close to trivial.
Marketer polishing AI-generated drafts
Content produced by a generator is structurally fine but reads unmistakably synthetic, and editing every sentence by hand defeats the point of generating it.
The humanizer and sentence-level rewriting pass over generated drafts to remove the machine cadence, working as a finishing layer on top of whichever generator produced the draft.
Pricing
from $0 free forever, then $4.89 per month billed annuallyFreemium individual subscription metered by daily rewrites and monthly summarizations, with a separate business offering.
| Plan | Price | Includes |
|---|---|---|
| Basic | $0 per month |
Ten rewrites a day is enough to prove the value and not enough to work with, which is exactly how a free tier should be calibrated. |
| Advanced | $6.99 per month, or $4.89 billed annually |
Sufficient for most individuals. The 50 percent annual discount makes the annual commitment the obvious choice if you intend to keep it. |
| Unlimited | $9.99 per month, or $6.99 billed annually |
At $6.99 annually, the top tier costs less than most competitors' entry tiers, so heavy users should skip Advanced entirely. |
Billing notes
- Annual billing is advertised at a 50 percent discount, taking Advanced from $6.99 to $4.89 and Unlimited from $9.99 to $6.99 per month.
- Students and educators with a .edu address and nonprofit staff qualify for a 30 percent discount on both monthly and annual plans, arranged through support.
- The free plan meters rewrites daily rather than monthly, which suits bursty writing better than a monthly bucket but punishes a single heavy afternoon.
- Summarization is metered separately from rewriting and is the tightest constraint on the free and Advanced tiers.
- Paid tiers carry a 3-day trial, which is short but adequate because the value of a rewriting tool is obvious within an hour.
- The gap between Advanced and Unlimited is roughly two dollars a month, which makes Advanced difficult to justify for anyone who writes daily.
Value assessment: Wordtune is the least financially consequential purchase in this category. At $6.99 a month annually for unlimited rewriting, summarization, and grammar checking, it costs less than a third of a frontier model subscription and does one thing better than any of them, which is offering multiple faithful rephrasings of a sentence in one keystroke inside the tool you are already typing in. The value question is not price, it is fit: if your bottleneck is producing content, Wordtune will not help at all, and no discount changes that. If your bottleneck is that your writing does not read the way you want, it is close to free relative to the time it returns.
Strengths & limitations
Strengths
- Sentence rewriting is still the best in class, faster and more faithful to original meaning than asking a general assistant to rephrase, largely because the interaction is a keystroke rather than a prompt.
- The extension model means it works where you already write, in Gmail, Docs, LinkedIn, and CMS fields, rather than asking you to move to a new workspace.
- Pricing is genuinely low, with a usable free tier, a 50 percent annual discount, and a further 30 percent off for students, educators, and nonprofit staff.
- Summarization of documents, articles, web pages, and YouTube videos turns it into a reading tool as well as a writing tool, which most competitors ignore entirely.
- The counterargument and elaborate tools are genuinely differentiated for argumentative and academic writing and have no real equivalent in the generator-focused products.
- Built by AI21 Labs, a real foundation-model research company rather than a prompt wrapper, which is why the rewriting quality was ahead of the field for years.
- AI21 states a five-source verification threshold for factual assistance, a stronger public grounding posture than most of this category bothers to describe.
Limitations
- It does not generate content from a brief. If your problem is the blank page, this is the wrong product entirely.
- English-only output. Translation goes from ten languages into English, but you cannot write natively in Spanish, German, or anything else, which rules it out for multilingual content teams.
- No brand voice training, no style guide, no knowledge base, and no meaningful team workspace, so it offers nothing to an organization trying to make several writers sound alike.
- No SEO, no publishing, and no integrations with content systems, so it sits entirely outside a content marketing workflow.
- The strategic position is weak. AI21 Labs has redirected toward enterprise agent products, confirmed funding stops at a 2023 Series C extension, a reported large round did not close, and the site copyright still reads 2025. The product is live and maintained but not obviously prioritized.
- Free tier summarization at three a month is a demo rather than a usable allowance, and the daily rewrite meter on Basic runs out inside a single working session.
Head-to-head comparisons
3 alternativesWordtune vs Jasper
from $59 per seat per month billed annually, or $69 billed monthlyJasper generates governed campaigns from a stored brand system for $69 a seat; Wordtune improves individual sentences for under $10 a month. They are complements rather than rivals, and a Jasper team with non-native English writers still benefits from Wordtune in the browser. If all you need is for your own writing to read better, Wordtune is the entire answer and Jasper is a large overpayment.
Full Wordtune vs Jasper comparisonWordtune vs Anyword
from $39 per month billed annually, or $49 billed monthlyAnyword tells you which of five variants will convert; Wordtune gives you five ways to say the same thing and no opinion about which performs. Performance marketers with real ad spend need Anyword's prediction and Wordtune has nothing to offer them there. Writers whose problem is phrasing rather than conversion should take Wordtune at a tenth of the cost.
Full Wordtune vs Anyword comparisonWordtune vs Rytr
from $0 free forever, then $7.50 per month on the yearly planRytr produces copy from nothing, Wordtune improves copy that exists, and they cost about the same. The choice is a diagnosis: if you stare at empty fields, buy Rytr; if you write plenty and dislike how it reads, buy Wordtune. Both have real free tiers, so the honest advice is to run both for a week and see which one you keep opening.
Full Wordtune vs Rytr comparisonImplementation & onboarding
- Setup time
- Five minutes. Install the extension, sign in, and it appears wherever you type. There is no configuration and nothing to train.
- Learning curve
- Essentially none. Highlight text, pick a rewrite. The only underused parts are the summarization and counterargument tools, which most people never discover because the rewriting is so immediately obvious.
- Onboarding
- Entirely self-serve with a permanent free plan and 3-day trials on paid tiers. The education and nonprofit discount requires contacting support rather than a checkout code.
- Migration notes
- Nothing to migrate. Wordtune stores no content library of consequence and does not own your documents, so adopting or dropping it changes nothing about where your writing lives. This is a genuine advantage: the switching cost in both directions is zero.
Platform, API & security
- Platforms
- Chrome extensionMicrosoft Edge extensioniOS applicationWeb editor
- API
- An API is referenced alongside the extension and app distribution, but Wordtune is not sold or documented as a developer platform and API access is not part of the published consumer tiers.
- Compliance
- GDPR
- Data residency
- Not published as a customer-selectable option.
- SSO
- Not published on the individual plans; enquire under the business offering.
- Security notes
- Wordtune is operated by AI21 Labs, which builds its own language models, so the text you submit is processed by a vendor with first-party model infrastructure rather than being brokered to a third-party API. AI21 states a five-source verification threshold before treating information as credible in factual assistance. Detailed certification information is not published on the consumer pricing pages.
Support & resources
- Channels
- Email supportHelp centerSupport contact for education and nonprofit discounts
- Documentation
- Help center covering the extensions, mobile app, editor, summarization, and billing.
- Community
- A very large user base, claimed at over ten million, but no significant official community forum.
Company
- Founded
- 2017
- Headquarters
- Tel Aviv, Israel
- Ownership
- Venture-backed (AI21 Labs)
- Founders
- Yoav Shoham, Ori Goshen, Amnon Shashua
- Employees
- Not disclosed; headcount has been reduced during the shift toward enterprise products
- Funding
- AI21 Labs has confirmed roughly $336M raised, with the last confirmed capital event a Series C extension in November 2023. A reported $300M Series D discussed in 2025 did not formally close. Investors include Google, Nvidia, Zoom Ventures, and others.
Funding history
| Round | Amount | Year | Notes |
|---|---|---|---|
| Series B | $64M | 2022 | Funding AI21's own foundation model development alongside Wordtune as the consumer product. |
| Series C and extension | $155M plus extension | 2023 | Raised at a reported $1.4B valuation with participation from Google and Nvidia; the last confirmed capital event. |
Timeline
- 2017AI21 Labs founded in Tel Aviv by Yoav Shoham, Ori Goshen, and Amnon Shashua to build independent foundation models.
- 2020Wordtune launches as AI21's consumer writing assistant, with sentence rewriting quality noticeably ahead of the template-based tools of the period.
- 2022Adds summarization for documents, articles, and web pages, expanding from a rewriting tool into a reading and writing assistant.
- 2023AI21 raises a $155M Series C at a reported $1.4B valuation with Google and Nvidia participating, and expands Wordtune with generative and business-oriented features.
- 2025AI21 redirects toward enterprise agent products; a reported $300M Series D does not formally close and the company faces strategic pressure while Wordtune continues to ship.
- 2026Wordtune remains live and self-serve with a free plan, Advanced at $6.99, and Unlimited at $9.99, plus the AI humanizer and YouTube summarization, though it is clearly no longer the parent company's strategic priority.
Integrations
- Google Docs, Gmail, and Google Workspace via the Chrome extension
- LinkedIn, Slack, and other web applications via the extension
- Microsoft Edge via the Edge extension
- iOS for mobile writing and messaging
- YouTube for video summarization
- No native CMS, CRM, or marketing platform connectors
Frequently asked questions
10 questionsWhat is Wordtune?
Wordtune is an AI writing assistant from AI21 Labs that improves writing you have already produced. It rewrites sentences into alternative phrasings, switches between casual and formal tone, shortens and expands text, checks grammar, summarizes documents and videos, and humanizes AI-generated text, working inside Chrome, Edge, iOS, and a web editor.
How much does Wordtune cost?
The Basic plan is free with 10 rewrites a day, 3 summarizations a month, and unlimited grammar checking. Advanced is $6.99 a month, or $4.89 billed annually. Unlimited is $9.99 a month, or $6.99 billed annually, and removes all caps. Students, educators with a .edu address, and nonprofit staff get a further 30 percent off through support.
Does Wordtune generate content from scratch?
Not really, and this is the key thing to understand before buying. Wordtune has continuation and elaboration tools that extend what you have started, but it is built to improve text that exists rather than to produce a draft from a brief. If your problem is the blank page, buy a generator such as Rytr, Junia, or Koala instead, and consider adding Wordtune as a finishing pass.
Is Wordtune better than asking ChatGPT to rewrite something?
For this specific task, usually yes, and the reason is interaction cost rather than model quality. Highlighting a sentence and getting five faithful rephrasings in one keystroke inside Gmail is a fundamentally faster loop than switching to a chat window, pasting, prompting, and pasting back. Wordtune also costs about a third of a frontier model subscription. For anything beyond rewriting, the frontier model wins comfortably.
What languages does Wordtune support?
Output is English only. Wordtune translates from Spanish, Mandarin, Arabic, Hindi, Korean, Hebrew, Russian, German, French, and Portuguese into English, which serves non-native English speakers well, but you cannot use it to write natively in another language. Multilingual content teams should look elsewhere.
Does the AI humanizer defeat AI detectors?
Wordtune sells a humanizer that rewrites machine-generated text into a less obviously synthetic register, and unlike several competitors it names the feature plainly. It does not claim to defeat any particular detector, and no vendor in this category can credibly make that claim, because detection systems change constantly and their accuracy is contested. Treat it as a readability improvement rather than a guarantee.
Can a team use Wordtune?
There is a business offering alongside the individual plans, but the published self-serve pricing covers individuals and the product has no brand voice training, style guide enforcement, shared workspace, or review workflow. A team can buy several licences, but Wordtune will not make several writers sound like one company. For that, look at Jasper or Anyword.
How does summarization work and what are the limits?
Wordtune summarizes documents, articles, web pages, and YouTube videos. Limits are three summaries a month on the free plan, fifteen on Advanced, and unlimited on the top tier. The free allowance is a demonstration rather than a working amount, and video summarization in particular is worth the upgrade for anyone who researches from conference talks and tutorials.
Is Wordtune still actively developed?
It is live, priced, self-serve, and distributed on Chrome, Edge, and iOS, so it is not abandoned. But AI21 Labs has clearly redirected toward enterprise agent products, its last confirmed funding was a 2023 Series C extension, a reported $300M Series D did not close, and the site copyright still reads 2025. Buy it as a stable utility at a low monthly price, not as a bet on an ambitious roadmap.
Who is behind Wordtune?
AI21 Labs, founded in Tel Aviv in 2017 by Yoav Shoham, Ori Goshen, and Amnon Shashua, who also co-founded Mobileye. AI21 builds its own foundation models rather than reselling someone else's API, which is why Wordtune's rewriting quality was ahead of the template-driven competition for years. Confirmed funding is around $336M with investors including Google and Nvidia.
Editorial verdict
Wordtune is the most useful product in this category for the largest number of people and almost nobody thinks of it as an AI writing tool, because it does not write. It rewrites, and it does that better and faster than any general assistant because the interaction is a keystroke on a highlighted sentence rather than a prompt in another window. For non-native English speakers, consultants, students, and anyone whose job is email, $6.99 a month for unlimited rewriting, summarization, and grammar checking is close to a rounding error against the time it returns. The two honest cautions are scope and sponsor: it will not generate anything, produce SEO content, or make a team sound consistent, and AI21 Labs has visibly moved on to enterprise products with funding that stopped confirming in 2023. Try the free plan, and if you keep hitting the daily limit, go straight to Unlimited and skip Advanced.
Written by the SaaSTracker editorial team. Awards, when shown, are judged against the published criteria in our methodology.