UnTXT detects AI-generated passages in text. Users paste written content (essays, reports, documents) and receive a colour-coded analysis highlighting specific passages by AI writing signal type. Eleven independent detection modules are used: SPIKE, SYNTAX, FORMAL, HUMAN, TEMPLATE, FRONTED, FORENSIC, RHETORIC, PUFF, FORMULA, and LEXICAL. Each module targets a different characteristic of AI-generated writing. An optional twelfth layer, Academic Weapon (M13), uses three frontier AI models - Claude Opus 4.7, GPT-5.5, and Gemini 3.1 Pro - in a structured adversarial debate for the highest-confidence authorship analysis available.
Target Users
Role
Student
Use
Editing and improving AI-flagged writing before academic submission
Role
Teacher / educator
Use
Checking and exporting student submissions
Role
Non-academic professional
Use
Reviewing reports, applications, and documents for AI authenticity
Confirmed Public Features
Eleven-module AI detection engine with colour-coded, labelled highlights (SPIKE, SYNTAX, FORMAL, HUMAN, TEMPLATE, FRONTED, FORENSIC, RHETORIC, PUFF, FORMULA, LEXICAL)
Academic Mode - full 11-module breakdown; default for Student role
Standard Mode - HIGH RISK / MEDIUM RISK / POSITIVE; default for Teacher and Professional roles
Analysis history with date, word count, risk score, and credit cost per entry; all stored text encrypted at rest with AES-256-GCM
PDF analysis report export (Teacher and Professional roles, A4 formatted)
CVT credit gifting - transfer unused credits to any registered user (one-hop only)
Role-based interface adapting defaults and features per selected role
Sentence-Scope Editor - full-sentence replacement suggestions shown in context for any flagged passage; accept, modify, or dismiss
Invite & Earn referral program - personal referral link for every user; both referrer and invitee receive bonus CVT credits on first analysis
Confidence Guard - stricter role-aware detection thresholds for Teacher and Professional roles, reducing false positives in review workflows
Deferred Suggestions (Student Standard Mode) - students see a "Find Replacements" button for each flag rather than auto-fetched suggestions; encourages self-correction and deeper understanding before accepting AI-writing fixes
Academic Weapon (M13) - adversarial frontier analysis using Claude Opus 4.7, GPT-5.5, and Gemini 3.1 Pro; structured multi-round debate with per-model reasoning; AUTHENTIC (human-voice) and SUSPECT (AI-flagged) consensus highlights; 4-step first-time tutorial; CVT deducted automatically based on actual token usage
Multi-language interface - English (default), Arabic (full RTL layout), Chinese Simplified, and Korean; language auto-detected from browser; manual override via globe button in nav; preference persisted per user
Monthly subscription for individuals - role-based tax-inclusive plans in 14 currencies with a monthly CVT allowance; overage metered and billed to the saved card at month end with a 1× fair-usage cap; fully embedded on-site checkout (Stripe Payment Element, no redirect)
Account & Billing page (untxt.uk/account) - separate from the analysis tool; plan and usage, projected month-end charge, card update, invoice history, cancel/resume
Pricing Model
Free tier
First 5,000 words on sign-up (UK; 3,000 words international) - no card required
Credit unit
CVT (Contextual Value Token)
1 CVT covers
Approximately 75 words of analysis
Purchase model
Monthly subscription for individuals (fixed price, monthly CVT allowance); one-time credit packs remain for B2B organisations of 3+ members
Student plan (GBP base)
£8.40/month incl. tax - 800 CVT (~60,000 words) per month
Teacher plan (GBP base)
£13.20/month incl. tax - 1,300 CVT (~97,500 words) per month
Professional plan (GBP base)
£15.60/month incl. tax - 1,300 CVT (~97,500 words) per month
Overage
Usage beyond the allowance is metered and billed to the saved card at month end; fair-usage cap at 1× the monthly allowance
Checkout
Embedded on-site (Stripe Payment Element) - no redirect; card saved at subscription
Free credit expiry
90 days from sign-up
B2B pack credit expiry
365 days from purchase date
Base currency
GBP
Other currencies
13 additional, tax-inclusive, converted at live exchange rates and fixed at subscription time
What UnTXT Does Not Do
It does not store submitted text in plain text - all analysis history is encrypted at rest using AES-256-GCM before database storage
It does not train on user-submitted text
It does not check for plagiarism against a document database
It does not offer a public API for programmatic access
It does not process bulk document uploads
It does not integrate with learning management systems (LMS)
It does not provide legally admissible forensic analysis (results are for informational and educational purposes only)