QuillBot
Comprehensive AI writing and paraphrasing platform integrating sentence rewriting, grammar checking, AI content detection, and tone enhancement
Product node overview & trust baseline
Operator provenance, privacy baseline and site-wide pricing belong directly to the product node and are inherited across linked task edgesQuillBot (founded in 2017 by UIUC alumni, now a Learneo, Inc. business in Redwood City, California) is one of the world's most widely adopted AI writing and paraphrasing platforms. Anchored by its signature Paraphraser engine, it has expanded into a full-featured writing suite featuring Grammar Checker, AI Content Detector, AI Humanizer, Plagiarism Checker, and Summarizer. The site operates a freemium model: the Free tier allows anonymous text rewriting up to 100 words across 2 core modes; QuillBot Premium displays an annual equivalent rate of $8.33/month (58% discount), unlocking unlimited word counts, 9 advanced phrasing modes, faster processing, and 25,000 words/month of plagiarism detection.
United States · Founded in 2017; acquired by Learneo in 2021
Provenance baseline: 18/20 · Operated by Learneo, Inc., serving over 35 million writers worldwide with complete terms and compliance disclosures.
Annual tier displays $8.33 USD per month billed annually (58% off) without explicit annual invoice total; annual amount remains null and unverified. Free tier is permanently free with 100-word limit.
Pricing transparency baseline: 33/35 · Cancellation:
Subject to Learneo privacy terms; texts processed for requested outputs and optional user history without selling personal data
Google Analytics · Datadog · Cloudflare
Product-level pricing & rules baseline
Verified plans, billing periods and cancellation terms owned by this product node; task-specific credit costs and free export limits are detailed per capability edge belowQuillBot Free and Premium annual pricing structure · 2026-10-31
Text rewriting, basic grammar proofreading, summarizer, citation generator
Unlimited words, advanced suggestions, tone analysis, faster processing；Displays only equivalent $8.33 USD/mo billed annually without explicit annual total
2 plan / billing-period records, all listed; — means that period is not recorded.
Annual tier displays $8.33 USD per month billed annually (58% off) without explicit annual invoice total; annual amount remains null and unverified. Free tier is permanently free with 100-word limit.
Verification has gaps; unknown prices and quotas are not inferred.
Cancellation, sources & verification record
Cancellation and refund terms unverified
QuillBot Premium Official Pricing Page ↗ · 2026-10-31 Capture 1 ↗
Archived official pricing sources: QuillBot Premium Official Pricing Page (2026-10-31) [text snapshot ↗]
Capability map & linked task edges
Whenever a capability passes fixed-fixture testing, an edge is automatically linked between this product node and the task topic for horizontal comparison.
| Linked task edge | Score | Assessment · historical test | Test scope & delivery | Inspect capability / follow edge |
|---|---|---|---|---|
| AI content detection | 97/100 | QuillBot, widely adopted by tens of millions of writers globally, demonstrates outstanding diagnostic precision and rapid turnaround with its AI Content Detector. Against our 90-word benchmark AI sample, the v7.1.0 cloud engine completed inference in 1.03s, delivering a calibrated 100.0% AI score alongside sentence-level highlighting and stylistic attribution. With full guest readability on results and registration only needed for PDF downloads, it represents a top-tier detection utility. | JSON · Output attached Historical test · 2026-11-03 Account / tier unconfirmed · Calibrated AI vs human text benchmark (literature master & LLM prose, 780 B) · Output attached |
Discovered product capabilities (pending fixture test / edge incubation)
Recorded capability · Not yet scoredThese capabilities have been identified on the product but have not yet undergone fixed-fixture testing. When an emerging capability co-occurs across multiple products, it incubates a new task edge.
Tested task edges (with scores and native artifacts) are strictly separated from discovered untested capabilities (unscored).
Peer product comparison across shared task edges
Matched by overlapping tested task edges; compare site-wide billing models alongside per-task benchmark scoresVerified monthly rates: Personal $16.99/mo, Pro $99.99/mo; explicit annual upfront invoice totals: Personal $167.88/yr ($13.99/mo), Pro $899.88/yr ($74.99/mo); extra unified credits available for top-up.
- AI content detection：QuillBot 97/100 vs Copyleaks 94/100
Verified direct monthly rates: Premium $23.99/mo, Professional $45.99/mo; annual plan cards show monthly equivalents ($12.99/mo, $24.99/mo) without explicit annual invoice total; Free tier provides 10,000 words/mo.
- AI content detection：QuillBot 97/100 vs GPTZero 96/100
Free tier is permanently free; Pro tier is $12/month with a 7-day free trial and email reminder sent 2 days prior to billing.
- AI content detection：QuillBot 97/100 vs Grammarly 96/100
Linked capability test: AI content detection
2026-11-03 · Native output attached. Findings cover the recorded fixture and conditions; paid specifications may be untested.
Verified native export & same-run screenshot evidence
Open native exported file (JSON · Output attached) ↗
Task quality
AI probability 100% · Human probability 0% · Classification label AI-generated · Confidence calibrated Yes
Detailed facts & historical record
- Measured fixture results
AI probability: 100% · Human probability: 0% · Classification label: AI-generated · Confidence calibrated: Yes
- Fixture findings
Exceptional benchmark performance: 100.0% AI probability detection matching ground truth, complete with sentence attribution and style trigger analysis in just 1.03s.
- Original historical observation
Not verified
- Suitable uses · historical assessment
Not verified
- Result & output evidence
Delivery capabilities
JSON · Output attached · Check watermark record
Detailed facts & historical record
- Recorded export specifications
JSON · Output attached · Check watermark record
- Historical specification note · not an official maximum
Overall AI probability verdict + sentence attribution and trigger analysis (Technical language, Overly polished)
- Watermark observation
Not verified
- Batch & API
Not verified
- Recorded free-tier dimensions
Not verified
- Attached file dimensions
Not verified
Speed & reliability
About 1.03s end to end in this run; reliability not retested
Detailed facts & historical record
- Timing observation
Network-observed server wait: 1.03s · End-to-end reference: 1.03s
- Date & fixture
2026-11-03 · anchor_aidetector_v1 · US-West (California, AS2914)
- Repeated tests & reliability
No standardized repetition count, success rate or variability range is recorded.
Interaction experience
Account requirement unconfirmed
Detailed facts & historical record
- Account requirements
Not verified
- Sign-in methods
Not verified
- Manual adjustment
Not verified
- Interaction observations
Not verified
Background & reputation
Learneo, Inc. (Quillbot Division) · Long-term reputation not independently verified
Detailed facts & historical record
- Service lifecycle notice
Not verified
- Operator
Learneo, Inc. (Quillbot Division)
- Recorded origin
Not verified
- Domain history record
Not verified
- Background & reputation assessment
Not verified
- External reputation record
Not verified
Engineering & privacy
Processing location unconfirmed；Explicit retention period unconfirmed; inspect policy record
Detailed facts & historical record
- Processing location
Processing location unconfirmed
- Third-party tracking record
Google Analytics · Datadog · Cloudflare
- Engineering & privacy assessment
Not verified
- Retention statement
Explicit retention period unconfirmed; inspect policy record
Task free allowance & pricing disclosure
Not recorded
Not recorded
Site-wide plans belong to the product node (see Product-level pricing baseline ↑).
Expand site-wide plans aligned for AI content detection (2 records)
QuillBot Free and Premium annual pricing structure · 2026-10-31
Text rewriting, basic grammar proofreading, summarizer, citation generator
Unlimited words, advanced suggestions, tone analysis, faster processing；Displays only equivalent $8.33 USD/mo billed annually without explicit annual total
2 plan / billing-period records, all listed; — means that period is not recorded.
Annual tier displays $8.33 USD per month billed annually (58% off) without explicit annual invoice total; annual amount remains null and unverified. Free tier is permanently free with 100-word limit.
Verification has gaps; unknown prices and quotas are not inferred.
Cancellation, sources & verification record
Cancellation and refund terms unverified
QuillBot Premium Official Pricing Page ↗ · 2026-10-31 Capture 1 ↗
Evaluation basis & full scores · Overall 97/100
Overall = honesty & reputation × 30% + capability × 70%. Component maxima follow this report’s rubric. List scores are rounded for display; original precision is retained here.
Scoring version 2.3.1 · Test fixture anchor_aidetector_v1
Honesty & reputation · 90/100 · 30%
| Criterion | Score | Rationale | Basis |
|---|---|---|---|
| Pricing transparency | 33 / 35 | Explanation unavailable | Evidence A → |
| Interaction restraint | 26 / 30 | Explanation unavailable | Evidence A → |
| Background & reputation | 18 / 20 | Explanation unavailable | Evidence A → |
| Engineering & privacy | 13 / 15 | Explanation unavailable | Evidence A → |
Capability · 100/100 · 70%
| Criterion | Score | Rationale | Basis |
|---|---|---|---|
| Task quality | 65 / 65 | AI Probability: 100% · Human Probability: 0% · Label: ai · Calibrated: Yes | Evidence A → |
| Deliverable specifications | 20 / 20 | Clean unwatermarked export (8/8); Export spec: Overall AI probability verdict + sentence attribution and trigger analysis (Technical language, Overly polished) | Evidence A → |
| Processing speed | 15 / 15 | Network-observed server wait: 1.03s (API mode: sync_json_verified; network upload 0s / end-to-end 1.03s shown for reference only, never penalized) | Evidence A → |
Legacy scores may include advertised maximum capabilities. Read tested output separately from paid capabilities. Records without matching tiers and scope are not ranked together.
Developer & citation kit · Claim updates, request benchmarks & embed verified badges
Product developers and writers can embed these SVG badges in official websites, GitHub READMEs or documentation, or use the channels below to sync product-wide plans and capabilities.
[](https://realtest.org/tools/quillbot.com/) <a href="https://realtest.org/tools/quillbot.com/"><img src="https://realtest.org/badges/quillbot.com.svg" alt="QuillBot — RealTest" height="24" /></a> 
[](https://realtest.org/tools/quillbot.com/#feature-ai-detector)