Last updated: September 2026 (v4.60.0) · For informational use · All details reflect the publicly available product
UnTXT finds the AI written passages in a piece of text. You paste in an essay, a report or whatever you happen to be working on, and what comes back is the passages themselves, each one marked either AUTHENTIC or SUSPECT with the reasoning written out, so you are looking at particular sentences instead of a bare percentage that tells you nothing you can use. There is no percentage anywhere in the product, and that is deliberate: a number invites you to work it downwards, which is not the same activity as writing better. Eleven detection modules do the underlying work, each tuned to a different tell, and they still reach developers in full through the API even though the app itself no longer asks a reader to learn eleven colours. Then there is Academic Weapon, which we call M13 internally, though it works quite differently from the others. It sets two frontier models against each other, Claude Opus 5 and GPT-5.6 Sol, arguing over the same passage, so disagreement is actually possible rather than smoothed away. When they do disagree, Claude Sonnet 5 steps in and settles it. That is the strongest reading the system produces, and it is the one we would defend.
| Free tier | First 1,000 words on sign-up, plus one complimentary Academic Weapon run - no card required |
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| Credit unit | CVT (Contextual Value Token) |
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| 1 CVT covers | Approximately 75 words of preliminary analysis. Charges are derived from what an operation costs to serve, so an Academic Weapon run is roughly 89 CVT regardless of length band |
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| Purchase model | Monthly subscription for individuals (fixed price, monthly CVT allowance); one-time credit packs remain for B2B organisations of 3+ members |
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| Student plan (GBP base) | £8.40/month incl. tax - 800 CVT (~60,000 words) per month |
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| Educator plan (GBP base) | £13.20/month incl. tax - 1,300 CVT (~97,500 words) per month |
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| Professional plan (GBP base) | £15.60/month incl. tax - 1,400 CVT (~105,000 words) per month |
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| Private Tutoring Firm (per seat, net) | £12.00/seat/month net - 1,400 CVT (~105,000 words) per seat; 1-5 seats, extendable to 20 with admin approval |
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| Enterprise (per seat, net) | £12.00/seat/month net - 1,400 CVT (~105,000 words) per seat; 5-1,000 seats, 5-seat minimum paid up front |
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| Overage | Usage beyond the allowance is metered and billed to the saved card at month end; fair-usage cap at 1× the monthly allowance. An optional auto top-up can also fund a shortfall mid-analysis, with explicit consent taken at signup and revocable any time |
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| Unused allowance | Students bank unused credit to their academic-year boundary; professionals to their fiscal quarter - both capped, so it can't accumulate indefinitely |
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| Checkout | Embedded on-site (Stripe Payment Element) - no redirect; card saved at subscription |
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| Free credit expiry | 90 days from sign-up |
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| B2B pack credit expiry | 365 days from purchase date |
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| Base currency | GBP |
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| Other currencies | 13 additional, tax-inclusive, converted at live exchange rates and fixed at subscription time |
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