Originality.ai is the SEO-agency gold standard and has been the default detector inside large content teams since 2023. TextSight is the newer, writer-first tool built around sentence-level highlights, a bundled AI rewriter, and a flat-rate subscription instead of a credit meter. This page is the honest comparison: where Originality is the right call, where TextSight wins, and what the actual differences look like once you run both on your own content.
A short feature table first. The narrative sections below go deeper on each row, with the parts where Originality.ai is genuinely the better call called out clearly.
| Feature | TextSight | Originality.ai |
|---|---|---|
| Free tier (no signup) | 3 scans/day, 5,000 chars/scan, no card | None: paid plan required to scan |
| Pricing model | Flat subscription, predictable monthly cost | Credit-based, pay per scan (~$0.01 per 100 words) |
| Entry price | $19.99/month Pro (flat) | $14.95/month Base (2,000 credits ≈ 200K words) |
| Annual effective rate (Pro) | $14.99/month ($179.88/year) | $30/month Pro Plan (15,000 credits) |
| .edu student discount | $13.99/month (verified .edu) | No published .edu rate |
| Sentence-level highlights | Yes: colour-coded per sentence with per-line evidence on free tier | Partial: document-level score + highlighted segments |
| Per-sentence "why-flagged" rationale | Yes: rhythm, vocabulary, paragraph cadence, length variance | No: document-level rationale only |
| ESL false-positive rate (Indian/Filipino/Chinese student writing) | ~6% (TextSight internal benchmark, 600 ESL essays) | Not publicly published; SEO-content-tuned |
| True-positive rate (raw GPT-4 + Claude output) | ~91% on TextSight 50-passage benchmark | Originality claims ~95%+ on SEO content (not independently audited) |
| Bundled AI rewriter in same scan | Yes: Light / Balanced / Maximum modes | No: separate product (originality.ai/AI rewriter), separate subscription |
| Plagiarism source URLs (database match) | Style-based Plagiarism Risk only | Mature database matching with source URLs |
| REST API | Business $39.99/mo ($29.99 annual), 150K words/month included | Available: credits same as UI ($0.01/100 words) |
| Chrome extension | Free on all tiers | Available on higher tiers |
| Brand recognition in SEO-agency space | Newer brand, growing | SEO-content-agency standard since 2022, 1,300+ blog posts |
| Best fit | Individual writers, students, ESL writers, small teams | High-volume SEO content shops, link-building firms, publishers |
Prices verified May 2026. Verify on each tool's pricing page before subscribing. "Win" markers reflect our reading of the feature gap, not a third-party audit.
Four things Originality does better than TextSight today. Acknowledging them is the point of writing this page in the first place.
Originality.ai has been the default AI detector inside large SEO content teams since 2023. When a content lead says "we ran it through Originality," that sentence parses without explanation inside an editorial workflow. Their team-workspace UX, shared scan history, and reviewer roles are mature, and an entire generation of SEO ops documentation references the product by name. TextSight does the same detection job, but inside a five-plus-seat agency it still needs a sentence of context.
If your team already pays for Originality, the surrounding tooling is built around it: SOPs name the score thresholds, freelancer briefs require an Originality screenshot, and your editorial calendar plumbing pulls Originality scores into Airtable or Notion. Switching is not a single-tool decision, it is a workflow decision. For solo writers or a brand-new team, the lock-in is zero; for a mature team, it is real.
Originality's credit model is one credit per 100 words. For teams with spiky volume, that is a feature rather than a bug, because a quiet month does not burn through a flat subscription. TextSight's flat-rate Pro at $19.99 monthly (or $14.99 on annual) is predictable but assumes consistent use. If your detection volume swings month-to-month, the credit math can be cheaper on Originality.
Originality.ai's plagiarism checker has a deeper crawled-web index and returns explicit source-match URLs, which is what an academic-integrity review or a legal copyright dispute actually needs. TextSight ships a Plagiarism Risk indicator inside every scan, but it is a publish-or-not signal, not a full source-attribution report. For editorial workflows that require traceable plagiarism evidence, Originality is the better tool today.
If you fit any of those four patterns, the rest of this page is informational rather than persuasive. Originality.ai is the tool for the job.
For freelancers, solo SEOs, small agencies, and individual students pre-scanning their own essays, here is where TextSight beats Originality.ai on the work that matters.
Every scan returns a sentence-by-sentence colour map showing exactly which lines tripped the model, plus a short rationale per line (rhythm flat, vocabulary cluster, paragraph cadence, and so on). You edit the specific sentences instead of rewriting the whole draft. Originality shows a strong document-level score and highlighted segments, which is great for a publish-or-not decision but less actionable when you are trying to ship a piece in fifteen minutes.
Originality's classifier was tuned for native SEO content, and on formally-taught English from non-native writers it over-flags clean human prose more than we would like. TextSight tuned its detector in 2025 against writing samples from Indian universities (IIT, IIM, DU, JNU), Filipino education programmes, and Chinese postgraduate writing. On identical-quality essays our internal false-positive rate is meaningfully lower. If your team writes globally distributed content, the calibration gap matters.
Originality.ai has no real ongoing free tier; you subscribe at $14.95 minimum to scan. TextSight's free tier is 3 scans per day at 5,000 characters per scan, no signup and no card. Verified student emails also get Pro at $13.99 monthly instead of the standard $19.99 ($14.99 on annual). The discount is automatic at signup with a .edu address.
The Business tier ships a full audit log of every scan: who scanned what, when, with which confidence score, exported as CSV. For agencies and editorial teams that need to defend a published piece against later AI-content disputes, the log is the evidence. Originality has team workspace history; TextSight ships the exportable audit log at $39.99 monthly (or $29.99 on annual).
The Business REST API exposes detection, AI rewriter, and bulk scanning behind a single key, so a single backend call can score a draft and request a rewritten rewrite in the same workflow. Originality exposes detection via a more mature API; rewriting is a separate product on a separate subscription. For pipelines that publish hundreds of articles a month, the bundled endpoints cut both code and total tool spend.
100-passage internal benchmark scanned through both tools the same day. Same passages, same conditions. Methodology + raw CSV at the bottom of this section. Re-tested quarterly. Originality.ai requires a paid plan to scan, so we used our research subscription on the Pro Plan ($30/mo, 15,000 credits) to run the comparison.
| Passage type | n | TextSight TPR / FPR | Originality.ai TPR / FPR | Notable gap |
|---|---|---|---|---|
| Raw GPT-4 output | 25 | 92% TPR | 95% TPR | Originality +3pp TPR on raw AI |
| Raw Claude (Sonnet/Opus) output | 25 | 90% TPR | 93% TPR | Originality +3pp TPR on raw AI |
| Native English human writing (SEO content style) | 25 | 3% FPR | 4% FPR | Both clean on native SEO content |
| ESL human writing (India/PH/CN) | 25 | 6% FPR | 19% FPR | TextSight 13pp lower FPR |
| Combined (all categories) | 100 | 91% TPR · 4.5% FPR | 94% TPR · 11.5% FPR | TextSight 7pp lower combined FPR |
If your work is SEO content for native English audiences. Originality is genuinely 3 percentage points better at catching raw AI on the kind of content it was built for. For an SEO content shop running 200 agency-written articles a week, that 3pp gap compounds. Originality's TPR advantage on SEO content is real and we won't pretend otherwise.
If your work involves ESL writers. TextSight's 13-percentage-point lower false-positive rate on ESL writing is the single biggest practical difference. On 100 ESL student essays, Originality wrongly flags 19 of them; TextSight wrongly flags 6. Over a semester of grading or a year of editing, that's the difference between sustainable workflow and a constant stream of overturned decisions.
If you write essays, journalism, fiction, or non-SEO content. The 7-percentage-point overall FPR gap matters more than the 3pp TPR gap. Originality's classifier is calibrated to SEO content register; TextSight's is calibrated to mixed-genre human writing. Pick the tool whose training distribution matches your content.
TextSight Pro is $19.99 monthly or $14.99 monthly on annual billing, flat-rate. Originality.ai uses a credit model: Base at $14.95 monthly for 2,000 credits, Pro at $30 monthly for 15,000 credits, where one credit scans 100 words.
Billed $89.88/year. Save $30
Billed $179.88/year. Save $60
Billed $359.88/year. Save $120
Yearly billing saves 25%. Originality.ai Base is $14.95/mo for 2,000 credits, Pro is $30/mo for 15,000 credits at the time of writing. View full pricing →
The biggest practical gap between the two products is the billing model, because the math flips depending on your monthly scan volume.
Originality.ai sells credits. Base at $14.95 monthly buys 2,000 credits, which scans 200,000 words. Pro at $30 monthly buys 15,000 credits, which scans 1.5 million words. If your team writes 500,000 words a month you are paying around $30 to scan all of it, and any unused credits roll into the next month on most plan variants. For spiky-volume teams this is the more honest meter.
TextSight Pro is $19.99 monthly or $14.99 monthly on annual billing for effectively unlimited scans inside a fair-use ceiling. Business is $39.99 monthly (or $29.99 on annual) with 100,000 AI rewriter words per month and REST API access. The trade-off is the inverse of credits: a quiet month does not give money back, but a busy month never bills more.
For a solo writer scanning around 50,000 words a month, Originality Base at $14.95 leaves a lot of credits unused; TextSight Pro on annual at $14.99 is the same money with the AI rewriter included. For a five-seat SEO agency scanning 800,000 words a month, Originality Pro at $30 covers it; TextSight Business at $29.99 covers it as well, with the audit log and REST API bundled. The flat vs credit gap matters most at the extremes: very low volume or very high spiky volume.
Both detectors are good products built by serious teams. The honest answer is workload-specific. Use this picker to find the tool that fits the work you actually do.
If you decide to switch, the migration takes most solo and small-team workflows under an hour. The one calibration step worth doing is re-running a sample so you can re-tune your team's "what counts as AI" threshold.
From the Originality dashboard, open the Scans tab and use the CSV export. You get a list of past scans with their AI and plagiarism scores. Keep it as your baseline; you will compare TextSight scores against it in the next step.
Pick eight to twelve documents from the Originality export that span the range of scores you saw (a few low, a few mid, a few high). Run each one through TextSight's bulk upload. TextSight typically scores a few points lower on the same human-written long-form content because rhythm-based scoring is less punitive on tidy SEO prose. Adjust your team's threshold accordingly, and re-write any SOP that names a fixed Originality score cutoff.
Install the Chrome extension, swap the API key in any internal tooling, and update internal documentation that names the detector. If your freelancer briefs require an Originality screenshot, swap that for a TextSight scan link or PDF export. We have a brief template on the API docs page you can crib from.
The full seven-tool ranking with detection accuracy, pricing, and use-case fit side-by-side.
See the ranking →The classroom head-to-head. Sentence-level highlights, ESL calibration, and student workflows compared.
Read the compare →Bulk scan workflow, audit log, and the agency editorial pipeline built around per-line evidence.
Read the guide →Full tier breakdown for Free, Starter, Pro, and Business. Annual billing saves 25%.
See pricing →Start with TextSight's free tier. No card, no signup, no commitment. Your first scan in about six seconds.