Quillbot became the go-to student writing suite by leading with one of the best paraphrasers on the market and adding grammar, summarizer, citation generator, translator, and an AI detector around it. The free tier is generous on paraphrasing, the Premium price is friendly to a student budget, and the browser extension and Docs plugin show up everywhere a student already writes. TextSight came from the other direction: detection-first, ethical AI rewriter as the rewrite layer, sentence-level highlights with per-line rationale, and an ESL-aware classifier tuned against Indian, Filipino, and Chinese student writing. This page is the student-side framing, what each tool actually does for an essay, where each one is the right call, and why the honest workflow uses both at different points in the same submission.
A short feature table first, from a student's perspective. The narrative 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 ethical AI rewriter | Paraphraser-first writing suite (detector is a secondary feature) |
| Detection type | Sentence-level highlights with per-line rationale | Document-level percentage, limited sentence drill-down |
| Free tier | 3 scans/day, 5,000 chars per scan, no signup, no card | Paraphraser 125 words per request, basic detector with upsell prompts |
| Pricing model | Tiered SaaS: Free, Starter, Pro, Business | Free plus single Premium bundle |
| Entry price | Starter $9.99/mo monthly, $7.49/mo annual | Premium $9.95/mo monthly |
| Pro annual effective | $14.99/mo annual ($179.88/year) | Premium $49.95/year (single tier, no Pro split) |
| .edu discount | Pro at $13.99/mo for verified .edu emails | Student plan approx $4/mo on annual billing |
| Sentence-level evidence | Yes, every scan, with rhythm/vocab/cadence reasons per line | No, document-level percentage only |
| ESL FPR | 6% on formally-taught ESL prose | 14% on formally-taught ESL prose |
| Native FPR | 3% on native English essays | 8% on native English essays |
| GPT-4 TPR | 92% on 100-passage GPT-4 benchmark | 86% on 100-passage GPT-4 benchmark |
| Claude TPR | 90% on 100-passage Claude benchmark | 83% on 100-passage Claude benchmark |
| Bundled AI rewriter | Ethical AI rewriter trained against same classifier, 3 modes | Paraphraser bundled (not built to lower detection signals) |
| REST API | Yes, available on Business tier with audit log | Limited public API, mostly paraphraser-focused |
| Best fit | Students who need a calibrated pre-submission AI scan with sentence evidence | Students who mainly need paraphrasing, grammar, and citation help during drafting |
Prices verified June 2026. Quillbot pricing varies by promo and region. Verify on each tool's pricing page before subscribing.
Four things Quillbot does better than TextSight will ever try to. Acknowledging them is the whole point of writing this page as a pairing rather than a replacement.
Quillbot started life as a paraphraser and it is still one of the most polished on the market. Seven rewrite modes, sentence-by-sentence comparison, synonym sliders, freeze-word controls, and a Docs and Word plugin that rewrites in-place inside the editor. For students rewording source material to avoid plagiarism, paraphrasing dense academic passages into plain English, or shortening quotes into discussion-friendly summaries, Quillbot is genuinely the right primary tool. TextSight ships a free paraphraser at /tools/paraphraser/ but it is intentionally simpler and not the focus of the product.
Quillbot Premium bundles the paraphraser, grammar checker, summarizer, citation generator, translator, plagiarism checker, and AI detector behind one subscription. Buying the same features as separate tools would cost $30 to $50 monthly across multiple vendors. For a student who actually uses three or more of those tools every week, the bundle economics are hard to argue with.
Quillbot ships extensions for Chrome, Edge, and Safari plus a Google Docs add-on and a Microsoft Word plugin, so the paraphraser and grammar checker run inside the editor you are already writing in. You select a sentence, the rewrites appear in the sidebar, you click one to swap it. For students writing inside an LMS or Google Docs across a deadline week, that ambient coverage is the realistic 2026 default.
The Quillbot free tier allows paraphrasing up to 125 words per request with unlimited requests, plus basic grammar checking and a limited AI detector. For occasional rewording of a tricky source paragraph or rewriting a stiff intro, the free tier alone may cover the year. TextSight does not try to compete on paraphrasing; we expect students to use Quillbot Free or Premium for the writing-suite layer alongside TextSight for the detection layer.
For paraphrasing, grammar polish, summarizing long readings, generating citations across styles, and the in-editor plugin coverage, Quillbot is the right primary writing suite. The rest of this page is about the parts of the essay workflow Quillbot was not built to solve.
Quillbot's AI detector is a feature inside a writing suite. TextSight is a detector. That difference shows up in five specific places that matter for the pre-submission scan.
Quillbot added an AI detector to a tool that began as a paraphraser, and it sits inside a Premium bundle alongside seven other writing utilities. TextSight ships detection as the core product. The classifier is retrained on fresh GPT-4, Claude, Gemini, and Llama output every six weeks, and every release ships with a published calibration table against student-essay benchmarks. For a pre-submission scan where the score is the whole reason you are running the tool, the dedicated detector is the safer call than a side feature inside a paraphraser suite.
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 see the exact sentences that drove the score, and you edit those specific lines rather than rewriting the whole essay or running it through a paraphraser blind. Quillbot's AI detector reports a document-level percentage; for editing decisions that means you know the score moved but not which sentences moved it. Per-line evidence shortens the editing loop from rewrite-and-pray to edit-and-verify.
Generalist AI detectors have been challenged by university policy offices for over-flagging formally-taught ESL writing. TextSight is tuned against Indian, Filipino, and Chinese student writing; our internal testing on 2,400 student essays shows roughly 40 percent fewer false positives on identical-quality ESL prose. Quillbot's grammar checker is excellent for non-native writers during drafting, and TextSight's detector calibration matters specifically for the moment a non-native writer is worried about being mislabelled. Different jobs, both useful, no overlap.
When a TextSight scan flags a draft, the integrated AI rewriter rewrites the flagged sentences while preserving the student's voice and the factual content. The AI rewriter is trained against the same classifier that produced the detection score, so changes move the score in a measurable way: 50 GPT-4 paragraphs dropped from an average of 78 percent AI to 21 percent AI in our internal testing. Quillbot's paraphraser was built to preserve meaning during legitimate rewording, not to lower AI detection signals, and on the same 50 samples Quillbot rewrites carried a paraphraser fingerprint that some detectors flag more aggressively than the original ChatGPT output.
TextSight's free tier is three scans a day at 5,000 characters per scan (roughly 1,500 to 1,800 words), no email required, no card, sentence-level highlights included. Pro is $19.99 monthly or $14.99 monthly on annual billing with unlimited scans, and verified .edu emails get Pro at $13.99 monthly. Quillbot Premium is roughly $9.95 monthly, or $4 monthly on the annual student plan, for the writing-suite bundle. Honest framing: Quillbot wins on the bundle price if you mostly need paraphrasing and grammar; TextSight wins on dollar-per-detection-accuracy if your pain is the AI percentage on a graded essay.
Same 100 passages run through both detectors. 50 AI-written (GPT-4 and Claude, mixed prompts), 50 human-written (25 native English, 25 formally-taught ESL student essays). Numbers below are from TextSight internal testing. Re-runnable with the methodology block at the bottom.
| Metric | TextSight | Quillbot |
|---|---|---|
| GPT-4 TPR (true positive rate) | 92% | 86% |
| Claude TPR | 90% | 83% |
| Native English FPR (false positive rate) | 3% | 8% |
| ESL FPR (Indian, Filipino, Chinese student writing) | 6% | 14% |
| Combined TPR | 91% | 84.5% |
| Combined FPR | 4.5% | 11% |
The headline gap is the ESL false-positive rate: 6% for TextSight versus 14% for Quillbot. For a non-native English student, that is the difference between a clean pre-submission scan and a coin flip on whether your honestly-written paragraph gets flagged. On 50 formally-taught ESL student essays, Quillbot mislabelled 7; TextSight mislabelled 3. If your school uses an institutional detector with similar tuning to Quillbot, that gap is where most of the "wait, I actually wrote this" appeals start.
Both detectors catch most GPT-4 output (92% versus 86%). For a student who actually used ChatGPT to draft, either tool will flag the work and the editing job is similar in scope. The gap that actually changes outcomes is on the human-written side, because that is the score that ends up on a final submission. A 6% ESL FPR means TextSight gives a clean pre-submission scan to roughly 94 of 100 honestly-written ESL essays; an 11% combined FPR for Quillbot means roughly 1 in 9 honestly-written drafts get a false flag that the student then has to argue against. Sentence-level highlights make that argument concrete: you can point at the exact lines and the rationale, instead of waving at a document-level percentage.
Quillbot Premium at $9.95/mo covers a paraphraser, grammar, summarizer, citations, translator, and a secondary detector with 84.5% combined TPR and 11% combined FPR. TextSight Pro at $19.99/mo monthly or $14.99/mo annual ($13.99/mo on .edu) is detection-first with 91% TPR and 4.5% FPR plus an integrated AI rewriter trained against the same classifier. If your pain is paraphrasing dense source material, Quillbot is the cheaper primary tool. If your pain is the AI percentage on a graded essay, TextSight is the safer pre-submission scan. The honest stack uses both, since they solve different stages of the same essay; budget around $18 to $24 monthly for active deadline weeks and cancel back to the free tiers between terms.
The honest workflow is not Quillbot versus TextSight. It is Quillbot during drafting for paraphrasing and grammar, then TextSight as the pre-submission AI calibration pass. Two tools serving two stages of the same essay.
Open Google Docs, Word, or your LMS editor with the Quillbot extension or Docs add-on active. Write the essay in your own voice from your own notes. When you need to reword a source quotation or simplify a dense paragraph, run it through the Quillbot paraphraser in Standard or Formal mode and pick the rewrite that preserves your meaning. Run the Quillbot grammar checker for clarity polish. The prose itself comes from you.
Open app.textsight.ai, paste the finished draft, and scan. Free tier handles 5,000 characters in one paste; Pro handles 10,000. The scan returns in roughly thirty seconds with an Authenticity Score, a sentence-by-sentence colour map, and a short rationale per flagged line. Because you drafted yourself rather than generating with ChatGPT, the score is usually high; Quillbot paraphrased sections are the most common red zones.
Above 75 on the Authenticity Score, submit as is. Between 50 and 75, rewrite the red sentences specifically and re-scan. Below 50, the essay needs more substantial editing or an AI rewriter pass. The integrated AI rewriter rewrites flagged lines in three modes (Light, Balanced, Maximum) while preserving your voice; use it on the hardest sentences if you have free uses left, or on every flagged line on a Pro plan.
Submit through your LMS as required. Because you pre-scanned and edited, any institutional AI report (Turnitin or otherwise) should land in the low-AI range. The 90-day TextSight scan history on Pro is real evidence if an examiner ever asks about a draft from three weeks ago, and the Quillbot version history inside Docs shows the drafting trail.
Three things. First, Quillbot handles the paraphrasing, grammar, and clarity layer that hurts your grade before you reach the AI question at all. Second, TextSight catches the AI-shaped sentences that a detector will flag, before your professor sees them. Third, the combined tooling makes the editing loop short: Quillbot fixes the writing and the source rewording, TextSight fixes the calibration, and you stop second-guessing whether the draft is ready to submit.
TextSight Pro is $19.99 monthly or $14.99 monthly on annual billing, with verified .edu emails at $13.99 monthly. Quillbot Premium runs around $9.95 monthly, with an annual student plan near $4 monthly, plus a generous free tier on the paraphraser and a basic detector. The two stacks are complementary, not a replacement decision.
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Four common student situations and the realistic Quillbot plus TextSight stack for each. Pick whichever matches your next deadline.
Free tier on both. Quillbot Free for paraphrasing tricky source paragraphs at 125 words per request and a basic grammar pass. TextSight Free for a pre-submission AI scan: three scans a day at 5,000 characters covers a typical 800-word undergrad essay with two re-scan attempts. Total cost: zero.
Setup: Quillbot Free + TextSight Free.
Four to eight essays across two weeks. Quillbot Premium Student (around $4/mo on annual) for unlimited paraphrasing, summarizer, and citation generator across the deadline week. TextSight .edu Pro at $13.99/mo for unlimited scans, 10,000 character pastes, and 90-day history. Cancel both back to free after finals if you want.
Setup: Quillbot Premium Student + TextSight Pro .edu.
Long document, multiple revision cycles, examiner who is now expected to check for AI. Quillbot Premium for paraphrasing source material into your own words and the summarizer for literature review compression. TextSight Pro .edu for 10,000 character pastes per chapter section, file upload, and 90-day history that matters when an examiner asks about a draft from three weeks ago.
Setup: Quillbot Premium + TextSight Pro .edu.
Quillbot Free or Premium for the grammar correction and paraphrasing polish that hurts non-native essays. TextSight specifically for the ESL calibration: pre-scan, expect scattered yellows on formally-taught prose, focus edits on clusters of red. The 90-day Pro history is real evidence if a false positive ever needs to be contested with a professor or honour board.
Setup: Quillbot Free or Premium + TextSight Pro .edu.
The college-student landing page with perplexity, burstiness, and the .edu Pro plan.
For college →The sibling writing-assistant-vs-dedicated-detector head-to-head from a student's angle.
Read the compare →Seven-tool ranking with Turnitin correlation and false-positive rates side by side.
See the ranking →The general head-to-head outside the student frame, with the paraphraser angle deeper.
Read the compare →Free to try. No card. Verified .edu emails get Pro at $13.99 a month.