Working writers do not have the same problem set as students. There is no Turnitin gate. There is an Upwork milestone, a Substack publish button, a Medium editor, a client portal, and a Google ranking that depends on how the piece reads in three months. Quillbot is the editor-stage tool: a strong paraphraser, a competent grammar checker, a summarizer for research PDFs, an AI detector and an AI humanizer, all bundled at $19.95 a month, or $8.33 a month billed annually. TextSight is the delivery-stage tool: a dedicated detector that tracks within 5 to 10 points of what your client will run on Originality or Copyleaks, plus an AI humanizer purpose-built for calibration. This page is the honest comparison for content writers, freelancers, work-for-hire writers and small agency editors choosing between them, or both.
A compact feature table mapped against the writer workflow. The sections below go deeper on each row, with the parts where Quillbot is genuinely the better call called out clearly.
| Feature | TextSight | Quillbot |
|---|---|---|
| Primary product | Dedicated AI detector plus humanizer | Paraphraser-first suite with an AI detector and AI humanizer |
| Detection type | Sentence-level highlights, per-line rationale | Document-level score, limited per-line view |
| Free tier | 3 actions a day, no card required | 100-word paraphrase cap, signup required |
| Pricing model | 4 tiers: Free, Starter, Pro, Business | Single Premium tier plus team add-ons |
| Entry price | $9.99 monthly Starter, $7.49 yearly effective | $19.95 monthly Premium, $8.33 monthly billed annually |
| Pro annual effective | $14.99 monthly on annual, unlimited scans | $8.33 monthly Premium billed annually, paraphraser-led bundle |
| Sentence-level evidence | Colour-coded with rhythm, vocab, cadence rationale | No per-line rationale on detector output |
| False positives on human writing | 5.85% of 1,180 human-written academic papers wrongly flagged (published benchmark) | Not measured by us |
| Second-language writers | No significant gap: 4.6% flagged vs 8.1% for native writers | Not measured by us |
| Bundled humanizer | Calibration-tuned, 58 to 71 point average drop | AI Humanizer with four modes, not measured by us |
| REST API | Business tier at $29.99 yearly, detect plus humanize plus bulk | No API listed on its pricing page |
| Best fit | Pre-delivery scan for client work, Substack, Medium | Drafting kit for paraphrase, grammar, summarize |
Prices verified 23 August 2026. Verify on each tool's pricing page before subscribing. "Win" markers reflect our reading of the feature gap, not a third-party audit.
Four things Quillbot does better than TextSight inside a writer's day. Acknowledging them is the point of writing this comparison in the first place.
If your writing day involves paraphrasing client-supplied quotes, fixing tense slips in a fast first draft, summarizing a 30-page research PDF for an explainer post and generating citations for a B2B whitepaper, Quillbot Premium handles all of that for $19.95 a month, or $8.33 a month billed annually. Buying these as separate subscriptions would run $20 to $40 a month across Grammarly, a standalone summarizer and a paraphraser. On annual billing Quillbot is the cheapest path to a competent drafting kit, and that is a real advantage for a freelancer assembling tools on a freelance budget.
Quillbot started as a paraphraser and the tool still leads on the specific job of varying phrasing while preserving meaning. Premium lists 9 built-in modes plus custom modes (the free plan has Standard and Fluency), which gives writers finer control than most free alternatives. For rewriting client brand guidelines into a tone that fits their voice, or turning a press release into a blog hook that does not read corporate, Quillbot is the right tool. TextSight ships a Paraphraser in the free tools collection, but it is not at Quillbot's level of polish or mode coverage.
Quillbot's free tier gives access to a 100-word paraphrase limit, basic grammar checking, a summarizer with capped input length, limited AI detector access and up to 100 words of humanizing with limited usage. It is gated behind a Google or email signup, but the surface area is broader than most free plans on the market. For an early-career writer trying out a drafting kit before committing to a subscription, the Quillbot free tier shows off more of the product than TextSight's free tier shows off of its writing-suite side.
Quillbot ships a battle-tested Chrome extension, a Microsoft Word add-in, an Edge extension, and desktop and mobile apps. They integrate paraphrase, grammar and summarize directly inside the editing flow, which matters for writers whose draft never leaves the browser or Word. TextSight ships a Chrome extension with detection plus humanizer inline, but the Google Docs and Word integrations are not on parity yet. If your team writes in Word or in the browser and wants a polish tool at the cursor, Quillbot fits the editorial muscle memory better today.
If you fit any of those patterns and you do not deliver to clients who run their own AI scans, the rest of this page is informational rather than persuasive. Quillbot is the tool for the job.
For freelancers, work-for-hire writers, content shops and SEO writers running drafts past a client's own detector, here is where TextSight beats Quillbot on the work that decides whether the milestone gets approved.
Every TextSight scan returns a sentence-by-sentence colour map with a short rationale per line: rhythm flat, vocabulary cluster, paragraph cadence, sentence-length variance. You edit the specific lines instead of rewriting the whole draft. Quillbot returns a document-level score without per-sentence breakdown, so editing means guessing which paragraphs to touch. On a 2,000-word piece with six flagged sentences, the per-line evidence cuts editing time from about thirty minutes to under ten. For client-deliverable work, this is the difference between hitting deadline and missing it.
Detection is the core product at TextSight, not a feature bolted on later. The classifier was tuned in 2025 against a corpus of edited and paraphrased AI output, and tracks within 5 to 10 points of Originality, Copyleaks and GPTZero across our internal long-form test set. That is the number that matters when an Upwork client uploads your delivery to their own checker before approving the milestone. We have not measured Quillbot's detector against those checkers.
AI detectors can over-flag formally-taught English from non-native writers. Our training data includes second-language academic prose, and we measured the result rather than claiming one: on 1,180 human-written academic papers, second-language writers were flagged 4.6% of the time against 8.1% for native writers, a gap whose confidence interval crosses zero, so there is no significant difference in either direction. For a non-native English freelancer worried about being mislabelled as AI on a delivery, a published number is something you can point a client to.
The TextSight humanizer optimizes for rhythm, sentence-length variance and vocabulary-cluster removal rather than fluency or formality. On 50 GPT-4 paragraphs the Balanced mode dropped average AI scores by 58 points; Maximum mode dropped them by 71. The humanizer is in the same UI as the scan; you click Humanize on a flagged sentence and the rewrite drops in place. Quillbot's AI Humanizer shows its own Human score, and its AI Detector is a separate tool.
TextSight Business is $39.99 monthly or $29.99 monthly on annual billing with 100,000 AI humanizer words a month, five team seats, REST API access for detection plus AI humanizer plus bulk scan in one key, white-label PDF reports and an audit log. For a content shop running five to ten contractors, you can wire automatic pre-delivery scans into the submission portal. Quillbot's pricing page lists no API.
Most working writers do not pick one. They use Quillbot during drafting and TextSight before delivery. Here is what an afternoon on a 1,500-word B2B blog post for an Upwork client looks like with both tools in the same tab stack.
Open the client's three research PDFs, run each through the Quillbot summarizer to get the key claims in 200 words apiece. Paste the brief into a Google Doc, draft a section outline. Write the first draft in your own voice. Hit one paragraph that reads stiff, paste it into the Quillbot paraphraser on Fluency mode, swap two sentences back in. Catch comma splices and tense slips with the grammar checker. Generate two APA citations for the stats you pulled. Total time on the draft, about 90 minutes.
Paste the full 1,500 words into the TextSight scanner. The AI score lands at 62, with six sentences highlighted as AI-likely and two phrases flagged as plagiarism risk. Click Humanize on each red sentence on Light mode and the rewrites drop in place keeping the meaning and your voice. Rewrite the two plagiarism-flagged phrases manually in twenty seconds. Re-scan. Score moves to under 25, no red sentences, no plagiarism flags. Total time on the delivery pass, about eight minutes.
Quillbot Premium is $19.95 a month, or $8.33 a month billed annually. TextSight Starter is $9.99 a month, or $7.49 a month billed annually. Month to month the pair costs $29.94; on annual billing it is $15.82 a month. At the annual rate that is under forty minutes of work for a freelancer billing $25 an hour, or twelve minutes for one billing $80 an hour. Both are deductible as business software for self-employed filers, so the post-tax cost is lower again at your marginal rate. The dual stack pays for itself the first time you avoid one Upwork dispute or one Substack subscriber-trust collapse, and most working writers cross that line inside the first month.
TextSight Pro is $19.99 monthly or $14.99 monthly on annual billing, unlimited scans. Quillbot Premium is $19.95 monthly, or $8.33 monthly billed annually, for the paraphraser, grammar, summarizer, detector and humanizer bundle. Two prices, two different jobs, and the working-writer answer is often both.
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Yearly billing saves 25%. Quillbot Premium is $19.95/mo, or $8.33/mo billed annually, for the full writing suite (paraphraser, grammar, summarizer, plagiarism, detector, humanizer). View full pricing →
Both products are built by serious teams solving different problems. For writers the honest answer is workload-specific. Use this picker to match the tool to the work you actually do.
If you do both jobs heavily, the honest answer is both subscriptions. Combined cost is roughly $20 to $25 a month per editor and the dual stack pays for itself the first time you avoid one Upwork dispute.
The general head-to-head across detection, paraphrasing, pricing and free tier.
Read the compare →The essay-workflow comparison: Turnitin, ESL false positives and the student-writer discount.
Read the compare →The deliverable-first detector tuned for freelance, agency and SEO writing workflows.
Read the guide →The full writer workflow page: detection, humanizer, pricing and integrations.
See the page →Run one client draft through TextSight's free tier before your next Upwork milestone or Substack publish. Sentence-level highlights in about six seconds.
Honest head-to-heads with other detectors and humanizers.