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Test scope & comparison notes
These are recorded facts, not a unified ranking. Tested tiers and scope are not consistently recorded. Read pricing with its date and timing with its conditions. Privacy observations reflect visible flows and statements, not a security audit.
Cross-task capability coverage across selected products
Each product is scored independently per task edge; switch tasks below while keeping shared products selected| Task edge | languagetool.org | undetectable.ai | Switch / compare |
|---|---|---|---|
| AI paraphrasing & rewriting | 88/100 TXT · Output attached | 81/100 TXT · Output attached | Active task |
| AI content detection | Not tested in topic | 95/100 PDF · Output attached | Compare in task topic → |
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Browse this task →| Criterion | LanguageTool AI paraphrasing & rewriting 88/100 Seven-aspect task score LanguageTool demonstrated exceptional academic precision in AI text paraphrasing: it restructured the complete benchmark anchor within 4.1 seconds, achieving 67.0% lexical diversity while preserving 100% of crucial numerical figures ($1,250,000, 84.2%) and the verification token without hallucination or truncation. Offering 3 free daily rewrites anonymously under strict EU GDPR data protection without model training, it stands out as a highly reliable tool balancing readability and factual integrity. Tested export TXT · Output attached Historical test · 2026-11-02 | Undetectable AI AI paraphrasing & rewriting 81/100 Seven-aspect task score Undetectable AI's Humanizer specializes in adversarial humanization and paraphrasing. During testing, its base model completed rewriting in 0.76s with 92.0% lexical diversity while preserving the verification token and critical numeric facts, supporting free guest usage and one-click clipboard export. Tested export TXT · Output attached Historical test · 2026-11-04 |
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| Pricing & rules | ||
| Pricing plans | LanguageTool Basic and Premium individual multi-period subscription pricing structure · 2026-10-31 Plan · source date Monthly / one-time Annual bill / period Quota & limits Basic2026-10-31 ↗ USD 0/month — Monthly Up to 2,000 characters per check, 3 sentence rephrasings per day, basic grammar and spell check Basic grammar check, punctuation check, personal dictionary Monthly2026-10-31 ↗ USD 24.9/month — Monthly Up to 150,000 characters per text field, unlimited AI sentence paraphrasing, advanced style rules In-depth grammar & punctuation, style improvements, AI paraphrasing, style guide Quarterly2026-10-31 ↗ USD 49.9/3 months Other period Other period Billed quarterly at $49.90 ($16.63/mo equivalent), 150k chars per field and unlimited AI paraphrasing In-depth grammar & punctuation, style improvements, AI paraphrasing, style guide Annual2026-10-31 ↗ — USD 69.9/year Annual Billed annually at $69.90 ($5.83/mo equivalent), 150k chars per field and unlimited AI paraphrasing In-depth grammar & punctuation, style improvements, AI paraphrasing, style guide 4 plan / billing-period records, all listed; — means that period is not recorded. Explicitly details actual invoice amounts: $24.90/month, $49.90/quarter, $69.90/year, and $119.80 for 2 years; Basic tier is permanently free with 2k chars and 3 daily AI rewrites. Cancellation, sources & verification recordCancellation and refund terms unverified LanguageTool Premium Official Pricing Page ↗ · 2026-10-31 Capture 1 ↗ | Undetectable AI Free Trial, Monthly, and Annual word-quota subscription plans · 2026-10-31 Plan · source date Monthly / one-time Annual bill / period Quota & limits Free Trial2026-10-31 ↗ Free Free Free 250 words free trial quota for basic AI detection and humanization Basic AI detection and humanization trial 10K Words (Monthly)2026-10-31 ↗ USD 9.99/month — Monthly 10,000 words per month, unlimited AI detection, API compatibility, high quality output AI content detection and text humanization 10K Words (Annual)2026-10-31 ↗ — USD 60/year Annual Billed annually at $60.00 ($5.00/mo equivalent), 10,000 words per month, unlimited AI detection AI content detection and text humanization 20K Words (Monthly)2026-10-31 ↗ USD 19/month — Monthly 20,000 words per month, unlimited AI detection and Human Auto Typer AI content detection and text humanization 20K Words (Annual)2026-10-31 ↗ — USD 114/year Annual Billed annually at $114.00 ($9.50/mo equivalent), 20,000 words per month AI content detection and text humanization 35K Words (Annual)2026-10-31 ↗ — USD 189/year Annual Billed annually at $189.00 ($15.75/mo equivalent), 35,000 words per month AI content detection and text humanization 6 plan / billing-period records, all listed; — means that period is not recorded. Annual plan cards explicitly show the upfront invoice total (e.g. 10K words charged annually $60.00 at $5.00/mo equivalent) alongside monthly original rates ($9.99/mo); free trial is capped at 250 words. Cancellation, sources & verification recordCancellation and refund terms unverified Undetectable AI Official Pricing Page ↗ · 2026-10-31 Capture 1 ↗ |
| Free & trial allowance on the test date | 3 free AI paraphrasing queries per day without login, up to 1,250 characters per query | Basic model free without login; advanced model requires subscription |
| Cancellation & refunds | Not verified | Not verified |
| Disclosure of costs & limits | Not verified | Queue notification on submission followed by immediate result display |
| Task quality | ||
| Measured fixture results | Fact retention: 100% · Lexical diversity: 67% · Semantic similarity: 63.3% · Readability score: 100/100 | Fact retention: 85.7% · Lexical diversity: 92% · Semantic similarity: 29.3% · Readability score: 65/100 |
| Fixture findings | In the anchor_paraphrase_v1 benchmark, LanguageTool substantively restructured all 5 sentences with 67.0% lexical diversity and a perfect 100 readability score, flawlessly preserving 100% of facts and verification markers. | Achieved 92.0% lexical diversity while accurately preserving the verification token and core financial figures, exporting 168 words of complete text without truncation. |
| Original historical observation | Submitted anchor_paraphrase_v1/input.txt; LanguageTool neural rephraser completed sentence restructuring in ~4.1s with 67.0% lexical diversity and 100% fact retention. | Input 87-word standard paraphrase fixture (anchor_paraphrase_v1/input.txt); Undetectable AI delivered structural rewriting (168 words, 92.0% lexical diversity) while retaining REALTEST-PARAPHRASE-VERIFIED-2026, $1,250,000, and 84.2%. |
| Suitable uses · historical assessment | Not verified | Not verified |
| Result & output evidence | ||
| Delivery capabilities | ||
| Recorded export specifications | TXT · Output attached · Check watermark record | TXT · Output attached · No watermark in test |
| Historical specification note · not an official maximum | Not verified | Side-by-side visual diff highlighting + complete one-click copy |
| Watermark observation | Not verified | No watermark |
| Batch & API | Not verified | Not verified |
| Recorded free-tier dimensions | Not verified | 1 |
| Attached file dimensions | Not verified | Not verified |
| Speed & reliability | ||
| Timing observation | Network-observed server wait: 4.1s · End-to-end reference: 4.1s | Network-observed server wait: 0.76s · End-to-end reference: 0.76s |
| Date & fixture | 2026-11-02 · anchor_paraphrase_v1 · US-West (California, AS2914) | 2026-11-04 · anchor_paraphrase_v1 · US-West (California, AS2914) |
| Repeated tests & reliability | No standardized repetition count, success rate or variability range is recorded. | No standardized repetition count, success rate or variability range is recorded. |
| Interaction experience | ||
| Account requirements | Not verified | No login in this test |
| Sign-in methods | Completely anonymous usage supported; optional Google, Apple, and email login | Guest mode supports basic model; advanced models require subscription |
| Manual adjustment | Not verified | Not verified |
| Interaction observations | Not verified | Direct paste and rewrite workflow; free queue does not require login, and rewritten output copies with a single click without intrusive ads. |
| Background & reputation | ||
| Service lifecycle notice | Not verified | Not verified |
| Operator | LanguageTooler GmbH | Undetectable AI |
| Recorded origin | Not verified | Florida / New York, USA |
| Domain history record | Not verified | Operating since 2023 |
| Background & reputation assessment | Not verified | Registered US entity Undetectable Inc. with wide media recognition, though adversarial detection evasion carries academic ethics controversies. |
| External reputation record | Not verified | Well-known AI detection and humanization platform widely discussed across developer and content creator communities. |
| Engineering & privacy | ||
| Processing location | Uploaded for cloud processing | Processing location unconfirmed |
| Third-party tracking record | Stripe · Cloudflare | Google Analytics · Cloudflare · Hotjar · Meta Pixel |
| Engineering & privacy assessment | Not verified | Protected by TLS 1.3 and Cloudflare security with clear privacy terms. |
| Retention statement | Explicit retention period unconfirmed; inspect policy record | Explicit retention period unconfirmed; inspect policy record |
| Evaluation basis | ||
| Pricing transparency | 32 / 35 Pricing transparently lists monthly rates, annual monthly equivalents, and exact upfront annual totals ($60.00, $114.00, $189.00); free trial available without mandatory card binding. | |
| Interaction restraint | 27 / 30 Direct paste and rewrite workflow; free queue does not require login, and rewritten output copies with a single click without intrusive ads. | |
| Background & reputation | 16 / 20 Registered US entity Undetectable Inc. with wide media recognition, though adversarial detection evasion carries academic ethics controversies. | |
| Engineering & privacy | ||
| Task quality | 51 / 65 Fact Retention: 100% · Lexical Diversity: 67% · Semantic Similarity: 63.3% · Readability Score: 100/100 | 46 / 65 Fact Retention: 85.7% · Lexical Diversity: 92% · Semantic Similarity: 29.3% · Readability Score: 65/100 |
| Deliverable specifications | 16 / 20 Clean unwatermarked export (8/8); Export spec: Side-by-side visual diff highlighting + complete one-click copy | |
| Processing speed | 14 / 15 Network-observed server wait: 4.1s (API mode: sync_json_verified; network upload 0.1s / end-to-end 4.1s shown for reference only, never penalized) | 15 / 15 Network-observed server wait: 0.76s (API mode: sync_json_verified; network upload 0s / end-to-end 0.76s shown for reference only, never penalized) |
