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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 | smodin.io | undetectable.ai | Switch / compare |
|---|---|---|---|
| AI paraphrasing & rewriting | 82/100 TXT · Output attached | 81/100 TXT · Output attached | Active task |
| AI content detection | 91/100 JSON · Output attached | 95/100 PDF · Output attached |
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Browse this task →| Criterion | Smodin (AI Rewriter & Humanizer) AI paraphrasing & rewriting 82/100 Seven-aspect task score Smodin AI Rewriter & Humanizer delivered fast 1.18s cloud generation with 79.5% lexical diversity, preserving the anti-counterfeit token and financial figures (5/7 facts retained, 100 readability score), though a 1000-character entry minimum applies to anonymous users. Tested export TXT · Output attached Historical test · 2026-11-04 | 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 | Smodin free daily limits, Starter, and Premium subscription pricing tiers · 2026-10-31 Plan · source date Monthly / one-time Annual bill / period Quota & limits Free2026-10-31 ↗ Free Free Free Daily limited AI rephrasing and detection queries with anonymous access Basic AI detection and rewriting queries Starter (Monthly)2026-10-31 ↗ USD 12.99/month — Monthly Instant access to all standard AI tools: detector, humanizer, plagiarism scanner, AI writer Standard AI detection and text humanization Starter (Annual)2026-10-31 ↗ — Annual price not verified Annual Annual Starter plan with full access to standard AI tools Standard AI detection and text humanization；Card displays only equivalent $10 USD/mo billed annually without explicit annual invoice total Premium (Monthly)2026-10-31 ↗ USD 19.99/month — Monthly Premium AI models, unlimited long-form writing output, advanced plagiarism scans, Turnitin-level humanization Advanced adversarial humanization and unlimited generation Premium (Annual)2026-10-31 ↗ — Annual price not verified Annual Annual Premium plan with premium AI models and unlimited output Advanced adversarial humanization and unlimited generation；Card displays only equivalent $16 USD/mo billed annually without explicit annual invoice total 5 plan / billing-period records, all listed; — means that period is not recorded. Verified monthly rates: Starter $12.99/mo, Premium $19.99/mo; annual plan cards show monthly equivalents ($10/mo, $16/mo) without explicit annual invoice total; annual plans kept unverified. Verification has gaps; unknown prices and quotas are not inferred. Cancellation, sources & verification recordCancellation and refund terms unverified Smodin Official Pricing Cards (Monthly) ↗ · 2026-10-31 Capture 1 ↗ Smodin Official Pricing Cards (Annual) ↗ · 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 | Free tier has 1000-character minimum for anonymous entry; basic paraphrasing included | Basic model free without login; advanced model requires subscription |
| Cancellation & refunds | Not verified | Not verified |
| Disclosure of costs & limits | Character bounds and rewritten text displayed immediately upon generation | Queue notification on submission followed by immediate result display |
| Task quality | ||
| Measured fixture results | Fact retention: 71.4% · Lexical diversity: 79.5% · Semantic similarity: 46.6% · Readability score: 100/100 | Fact retention: 85.7% · Lexical diversity: 92% · Semantic similarity: 29.3% · Readability score: 65/100 |
| Fixture findings | Preserves verification token REALTEST-PARAPHRASE-VERIFIED-2026 and $1,250,000 amount with 79.5% lexical diversity, 100 readability score, and 1.18s cloud latency. | 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 | Rewritten text preserves anti-counterfeit token and $1,250,000 figure (5/7 core facts retained), achieving 79.5% lexical diversity and 100 readability score. | 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 | Writers and students needing rapid multi-lingual paraphrasing and readability improvement | 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 | Full natural rewritten text with direct copy | Side-by-side visual diff highlighting + complete one-click copy |
| Watermark observation | Completely watermark-free | No watermark |
| Batch & API | Web interactive input + developer API | Not verified |
| Recorded free-tier dimensions | Not verified | 1 |
| Attached file dimensions | Not verified | Not verified |
| Speed & reliability | ||
| Timing observation | Network-observed server wait: 1.18s · End-to-end reference: 1.18s | Network-observed server wait: 0.76s · End-to-end reference: 0.76s |
| Date & fixture | 2026-11-04 · 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 | No login required for basic rewriting | Guest mode supports basic model; advanced models require subscription |
| Manual adjustment | Not verified | Not verified |
| Interaction observations | Clean web interface with side-by-side comparison, zero forced redirects or popups. | 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 | Smodin LLC | Undetectable AI |
| Recorded origin | United States | Florida / New York, USA |
| Domain history record | 2019–Present | Operating since 2023 |
| Background & reputation assessment | Operated by Smodin LLC, providing AI language restructuring tools globally. | Registered US entity Undetectable Inc. with wide media recognition, though adversarial detection evasion carries academic ethics controversies. |
| External reputation record | Widely used AI writing, rewriting, and detection platform serving multi-lingual users globally. | 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 · Stripe · PayPal | Google Analytics · Cloudflare · Hotjar · Meta Pixel |
| Engineering & privacy assessment | Encrypted HTTPS transport, temporary session processing without public exposure. | 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 Transparently shows word count and mode options; Basic and Pro plans clearly listed. | 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 | 28 / 30 Clean web interface with side-by-side comparison, zero forced redirects or popups. | 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 Operated by Smodin LLC, providing AI language restructuring tools globally. | 16 / 20 Registered US entity Undetectable Inc. with wide media recognition, though adversarial detection evasion carries academic ethics controversies. |
| Engineering & privacy | 14 / 15 Encrypted HTTPS transport, temporary session processing without public exposure. | |
| Task quality | 43.1 / 65 Fact Retention: 71.4% · Lexical Diversity: 79.5% · Semantic Similarity: 46.6% · 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 natural rewritten text with direct copy | 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: 1.18s (API mode: sync_json_verified; network upload 0s / end-to-end 1.18s 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) |
