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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 | zerogpt.com | undetectable.ai | Switch / compare |
|---|---|---|---|
| AI paraphrasing & rewriting | 87/100 TXT · Output attached | 81/100 TXT · Output attached | Active task |
| AI content detection | 96/100 JSON · Output attached | 95/100 PDF · Output attached |
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Browse this task →| Criterion | ZeroGPT AI paraphrasing & rewriting 87/100 Seven-aspect task score Anonymous instant rewriting up to 300 words per scan, finishing cloud inference in 5.83s with 100% fact/token retention, 80.7% lexical diversity, and multi-color change highlights. Tested export TXT · Output attached Historical test · 2026-11-05 | 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 |
|---|---|---|
| Pricing & rules | ||
| Pricing plans | ZeroGPT Free, Pro, Plus, and Max personal subscription pricing structure · 2026-10-31 Plan · source date Monthly / one-time Annual bill / period Quota & limits Free2026-10-31 ↗ USD 0/month — Monthly 15,000 characters per scan, 1,250,000 words/mo allowance, 300 words one-time plagiarism check Basic AI detection and text analysis PRO (Monthly)2026-10-31 ↗ USD 14.99/month — Monthly 100,000 chars per scan, 50 batch files, 4.5M words/mo, ad-free experience, PDF reports Ad-free AI detection, PDF report export, thinking mode paraphraser & summarizer PLUS (Monthly)2026-10-31 ↗ USD 21.99/month — Monthly 100,000 chars per scan, 60 batch files, 5M words/mo, 35,000 words/mo plagiarism All PRO features, AI video detector, monthly plagiarism allowance MAX (Monthly)2026-10-31 ↗ USD 30.99/month — Monthly 150,000 chars per scan, 75 batch files, 7.5M words/mo, 60,000 words/mo plagiarism All PLUS features, unlimited paraphrase modes, ZeroCHAT-5 access PRO (Annual)2026-10-31 ↗ — USD 107.88/year Annual $107.88 billed annually ($8.99/mo equivalent), all PRO features included PRO tier annual features PLUS (Annual)2026-10-31 ↗ — USD 167.88/year Annual $167.88 billed annually ($13.99/mo equivalent), all PLUS features included PLUS tier annual features MAX (Annual)2026-10-31 ↗ — USD 239.88/year Annual $239.88 billed annually ($19.99/mo equivalent), all MAX features included MAX tier annual features 7 plan / billing-period records, all listed; — means that period is not recorded. Verified monthly rates: Pro $14.99/mo, Plus $21.99/mo, Max $30.99/mo; explicit annual upfront invoice totals: Pro $107.88/yr ($8.99/mo), Plus $167.88/yr ($13.99/mo), Max $239.88/yr ($19.99/mo); Free tier provides 15k chars/scan and 1.25M words/mo. Cancellation, sources & verification recordCancellation and refund terms unverified ZeroGPT Official Pricing Page (Annual View) ↗ · 2026-10-31 Capture 1 ↗ ZeroGPT Official Pricing Page (Monthly View) ↗ · 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 | 300 words per scan free; paid tiers expand to 10k words and unlimited modes | Basic model free without login; advanced model requires subscription |
| Cancellation & refunds | Not verified | Not verified |
| Disclosure of costs & limits | Results displayed immediately in workspace with one-click copy | Queue notification on submission followed by immediate result display |
| Task quality | ||
| Measured fixture results | Fact retention: 100% · Lexical diversity: 80.7% · Semantic similarity: 55.3% · Readability score: 100/100 | Fact retention: 85.7% · Lexical diversity: 92% · Semantic similarity: 29.3% · Readability score: 65/100 |
| Fixture findings | 100% retention across all 7 facts and security token, natural syntax rephrasing, 100% readability score, and fully usable without login. | 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 | Input 80-word standard paraphrase anchor fixture (anchor_paraphrase_v1/input.txt); ZeroGPT returned 93-word rewritten text in 5.83s, retaining 100% of facts including REALTEST-PARAPHRASE-VERIFIED-2026, $1,250,000, and 84.2% with 80.7% lexical diversity. | 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 · No watermark in test | TXT · Output attached · No watermark in test |
| Historical specification note · not an official maximum | Full 5-paragraph rewritten text + 3-color highlights + statistics card | Side-by-side visual diff highlighting + complete one-click copy |
| Watermark observation | No watermark | No watermark |
| Batch & API | Not verified | Not verified |
| Recorded free-tier dimensions | 0.7 | 1 |
| Attached file dimensions | Not verified | Not verified |
| Speed & reliability | ||
| Timing observation | Network-observed server wait: 5.83s · End-to-end reference: 6.49s | Network-observed server wait: 0.76s · End-to-end reference: 0.76s |
| Date & fixture | 2026-11-05 · 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 | No login in this test | No login in this test |
| Sign-in methods | Anonymous rewriting supported; Google OAuth and email sign-in for accounts | Guest mode supports basic model; advanced models require subscription |
| Manual adjustment | Not verified | Not verified |
| Interaction observations | Direct anonymous rewriting on homepage without popup barriers; presence of banner advertisements around workspace. | 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 | Olive Works LLC | Undetectable AI |
| Recorded origin | Wyoming, USA | Florida / New York, USA |
| Domain history record | Operating since January 2023 | Operating since 2023 |
| Background & reputation assessment | Operated by Olive Works LLC in Wyoming; massive global traffic, though debated in academia regarding false positive thresholds. | Registered US entity Undetectable Inc. with wide media recognition, though adversarial detection evasion carries academic ethics controversies. |
| External reputation record | Globally popular AI text detector and paraphraser widely adopted across students and content creators. | Well-known AI detection and humanization platform widely discussed across developer and content creator communities. |
| Engineering & privacy | ||
| Processing location | Processing location unconfirmed | Processing location unconfirmed |
| Third-party tracking record | Google Analytics · Cloudflare | Google Analytics · Cloudflare · Hotjar · Meta Pixel |
| Engineering & privacy assessment | Secured via Cloudflare and TLS 1.3; privacy terms state texts are processed for instant analysis and not repurposed for foundation model training. | 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 | 35 / 35 Free tier allows 300 words per scan; paid plans Pro ($14.99/mo or $107.88/yr), Plus ($21.99/mo or $167.88/yr), and Max ($30.99/mo or $239.88/yr) provide 10k words with clear upfront billing. | 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 | 24 / 30 Direct anonymous rewriting on homepage without popup barriers; presence of banner advertisements around workspace. | 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 | 15 / 20 Operated by Olive Works LLC in Wyoming; massive global traffic, though debated in academia regarding false positive thresholds. | 16 / 20 Registered US entity Undetectable Inc. with wide media recognition, though adversarial detection evasion carries academic ethics controversies. |
| Engineering & privacy | 14 / 15 Secured via Cloudflare and TLS 1.3; privacy terms state texts are processed for instant analysis and not repurposed for foundation model training. | |
| Task quality | 52.2 / 65 Fact Retention: 100% · Lexical Diversity: 80.7% · Semantic Similarity: 55.3% · Readability Score: 100/100 | 46 / 65 Fact Retention: 85.7% · Lexical Diversity: 92% · Semantic Similarity: 29.3% · Readability Score: 65/100 |
| Deliverable specifications | 20 / 20 Clean unwatermarked export (8/8); Export spec: Full 5-paragraph rewritten text + 3-color highlights + statistics card | 16 / 20 Clean unwatermarked export (8/8); Export spec: Side-by-side visual diff highlighting + complete one-click copy |
| Processing speed | 15 / 15 Network-observed server wait: 5.83s (API mode: sync_json_verified; network upload 0s / end-to-end 6.49s 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) |
