Undetectable.ai is the most recognized brand in the AI rewriter category and a clear leader in the freelance score-reduction market. The product is built around rewriting AI-assisted drafts so they score lower on common client-side detectors, and a small bundled detector validates the AI rewriter's own output. TextSight comes at the same problem from the working writer's side, built for the freelancer or agency-contracted writer who needs to defend their deliverables in client threads where Originality scans are now routine. The detector is the centre of the product with sentence-level highlights, a published methodology, and an audit log on the agency tier, and the AI rewriter is bundled for the calibration workflow rather than the score-reduction loop. This page is the honest writer comparison: where Undetectable is the right call for some pipelines, where TextSight is the better fit for paying client work, and why a score-reduction framing is a harder conversation to have when an agency asks how a deliverable was prepared.
A short feature table first, framed around what a freelance writer or content agency actually needs the day a deliverable goes out. The narrative sections below go deeper, including the parts where Undetectable is genuinely the better call for some pipelines.
| Feature for a writer workflow | TextSight | Undetectable.ai |
|---|---|---|
| Primary product | AI detector with bundled ethical AI rewriter | Rewrite-first AI rewriter with small bundled detector view |
| Detection type | Rhythm and structural variance, multi-model tuned | Self-validation only, not built for arbitrary deliverable scoring |
| Free tier | 3 scans/day, 1,500 words/scan, permanent, no card | One-time AI rewriter preview gated behind email signup |
| Pricing model | Flat monthly tier, unlimited scans on Pro | Credit packs $5 to $200/mo, word-metered AI rewriter allowance |
| Entry price | Starter $9.99/mo, Free tier permanent | $9.99/mo credit pack entry, no permanent free tier |
| Pro annual effective | $14.99/mo billed yearly ($179.88/year) | Roughly half off list with steep annual prepay, AI rewriter-only |
| .edu discount | Pro at $13.99/mo for verified .edu, billed monthly | No published .edu discount |
| Sentence-level evidence | Yes, every tier including free, with per-line rationale | No, paragraph-level readout only |
| ESL FPR (100-passage benchmark) | 6 percent on ESL writer samples | Not benchmarked as a detector, rewrite-first product |
| Native FPR (100-passage benchmark) | 3 percent on native English samples | Not benchmarked as a detector, rewrite-first product |
| GPT-4 TPR (100-passage benchmark) | 92 percent true-positive rate on GPT-4 output | Internal validation view only, not an independent score |
| Claude TPR (100-passage benchmark) | 90 percent true-positive rate on Claude output | GPT-family tuning historically, weaker on Claude |
| Bundled AI rewriter | Yes, calibration-first, voice-preserving, sentence-level apply | Yes, multi-pass rewrite AI rewriter with aggression slider |
| REST API | Business at $39.99/mo, 5 seats, audit log, white-label PDFs | API on higher credit tiers, no writer-team-shaped agency plan |
| Best fit | Working writer or agency needing pre-send scan plus ethical rewrite for client trust | High-volume API rewrite pipelines that solve detection elsewhere |
Pricing verified May 2026. Verify on each tool's pricing page before subscribing. "Win" markers reflect our reading of the feature gap from a working writer perspective.
Four areas where Undetectable does a job TextSight does not try to do. Acknowledging them is the point of writing this page in the first place, even though our framing is that a score-reduction workflow is a harder one to defend when a client asks how a deliverable was prepared.
Undetectable.ai has been shipping an AI rewriter-centred workflow since 2023, and the focus shows. The rewrite engine, the multi-pass aggression slider, and the Chrome extension are polished in the way that only a singularly-focused product team delivers. TextSight ships a competitive AI rewriter inside a broader detect-plus-rewrite workflow, but the depth Undetectable has built on the rewrite surface specifically is genuinely deeper for writers whose only metric is score reduction on one detector.
This is the core reason most writers reach for Undetectable, and it is not marketing. On Maximum mode the AI rewriter runs multiple rewrite passes and is willing to break voice and cadence to drive scores toward zero on a basket of common detectors. For a writer whose only metric is the AI percentage on a specific client tool, the multi-pass approach delivers numerically. TextSight's calibration-first rewrite trades a few points of score reduction for output that still reads like the source writer, which is the wrong trade-off if pure score chasing is the goal.
Undetectable's API has the deepest community documentation in the AI rewriter category, with credit-based pricing that suits agencies pushing hundreds of posts a month through an authenticity step inside a CMS. SEO shops automating long-tail content production at scale tend to prefer the credit model to a daily cap, especially when monthly volume is predictable. TextSight has REST API access on the Business tier, but Undetectable's third-party tutorial ecosystem is currently deeper.
Undetectable's annual billing is the most aggressive in the category, with effective monthly rates dropping by roughly half on a year commitment. For a writer or shop running steady high-volume rewriting through a single account, the per-word AI rewriter cost is competitive on prepay. The commitment risk is real, but for predictable monthly volume on an AI rewriter-only workflow, the annual plan wins on raw cost.
If you fit any of those patterns, the rest of this page is informational rather than persuasive. Undetectable is the tool that workflow asks for. The TextSight position is that most paying-client work needs detection and audit alongside the rewrite, but that is a separate argument from whether Undetectable delivers what it advertises on the rewriter side.
For freelance content writers, agency-contracted writers and content agencies that need to defend each deliverable in a client thread or an agency audit, here is where TextSight is the better working tool.
If you are about to send a 2,000-word feature to a client who runs every deliverable through Originality or a private classifier, you need a detector that scores arbitrary writing, not one tuned to clear its own AI rewriter's output. Undetectable's bundled detector exists to confirm rewrites land under an internal threshold. TextSight's detector is the centre of the product, with a published methodology, scored sentence by sentence, the same way an independent classifier reads your draft. For a freelance pre-send check, an independent detector is the only thing that gives you useful information.
Every TextSight scan returns a sentence-by-sentence colour map with a short rationale per line: rhythm flat, vocabulary cluster, paragraph cadence, sentence-length variance. On a 2,000-word feature you typically see exactly six to twelve sentences pulling the score down, so you rewrite those rhythms by hand or click the bundled AI rewriter on them. The other 1,988 words stay untouched and keep their voice. Undetectable returns a paragraph-level readout plus a wholesale rewrite, which is the wrong shape when you are protecting an established voice signature for a recurring client.
Working writers in 2026 are not drafting only with GPT. Many use Claude for long-form features, Gemini for research-heavy briefs, and rotate per client. A detector tuned only on GPT under-flags Claude or Gemini drafts, which is the wrong direction for honest pre-delivery feedback. TextSight's detector is tuned across all three families, so Claude's longer sentences, Gemini's hedging phrases and GPT's transition patterns score consistently. Undetectable's detector has historically focused on GPT-family output, which most reviewer benchmarks use.
Many working writers serving English-language clients are non-native speakers writing in formally-taught English. Detectors built on perplexity tend to over-flag that prose because both vocabulary and sentence cadence have lower-than-average predictability. TextSight's rhythm scoring weights structural variance, which separates cleanly from vocabulary choice, and reports false-positive rates roughly 40 percent lower than commodity perplexity-led detectors on identical-quality content across Indian, Filipino, Nigerian and Chinese writer samples. Undetectable's bundled detector is not primarily tuned for ESL accuracy.
TextSight Business at $39.99 a month bundles a REST API, 5 team seats, 100,000 AI rewriter words a month, white-label PDFs and a full audit log of every scan and rewrite. The audit log is the part that matters for content shops whose clients ask how each deliverable was prepared. Undetectable offers API access on its higher tiers with credit-based pricing, which is useful for pipeline authenticity, but it does not ship a writer-team-shaped plan with seats, audit log and bundled detection. Agencies running a defensible agency-writer pipeline tend to pick TextSight Business for that reason.
Undetectable.ai is a rewrite-first AI rewriter, not a detector, so a TPR/FPR head-to-head is the wrong shape. The relevant question for a working writer is: if a client drops your Undetectable-rewritten draft into TextSight or Originality, does it still read AI? We ran 50 GPT-4 passages through Undetectable at each of three aggression modes and scored the outputs with TextSight on default settings. The TextSight ESL false-positive rate on the same 100-passage detector benchmark is 6 percent, against 14 to 22 percent on the perplexity-led detectors writers typically face on Upwork and Fiverr.
| Undetectable.ai mode | TextSight catch rate | What a writer should read into this |
|---|---|---|
| Light aggression | 82 percent caught as AI | Mild rewrite barely shifts rhythm signal, score stays high |
| Balanced aggression | 71 percent caught as AI | Mid-aggression breaks some voice, leaves detectable cadence |
| Maximum aggression | 58 percent caught as AI | Most aggressive mode still flags more than half; voice damage real |
If you are a working writer worried about an editor or client flagging AI signal in published work, the load-bearing question is not which AI rewriter pushes a score lowest. It is which workflow gives you confidence the deliverable will hold up against the detectors your client actually runs. TextSight reports 92 percent true-positive on GPT-4 and 90 percent on Claude on the 100-passage detector benchmark, at a 3 percent native and 6 percent ESL false-positive rate. That means when you pre-scan a draft you wrote yourself, the score you see is close to the score the client's detector will read, with no inflated false-positive risk on formally-taught English.
For freelance writers building a recurring byline, the cost of a flagged deliverable is not just one rejected milestone. It is the chilling effect on future assignments, especially with agencies that review how each deliverable was prepared. The catch-rate numbers above show that even Undetectable's Maximum mode leaves a 58 percent residual AI signal on TextSight, which means the score-reduction route is genuinely fragile for repeat client work. The calibration route, where you pre-scan and rewrite the six to twelve flagged sentences in a 2,000-word feature, keeps your voice intact and gives you a defensible answer to the question every agency now asks: how was this prepared.
Ethical authenticity is not a marketing phrase, it is a working stance. The TextSight bundled AI rewriter runs in Standard or Maximum mode on the specific sentences the detector flagged, preserves the surrounding rhythm and the client quote, and leaves a calibration log on Business plans. The aggregate detector score climbs from 41 to 84 on the typical 2,000-word feature after rewriting eleven sentences, which is closer than a Maximum-mode rewrite pass would land if the client's detector is anything more recent than mid-2025. The score-reduction route trades that calibration for raw score reduction and breaks voice consistency across paragraphs that did not need rewriting.
This is the part of the comparison most vs-pages skip. We think it is the most important thing for a working writer to hear, because the freelance market has changed faster than the tooling pages admit.
By 2026, most repeat clients on Upwork, Fiverr and Contra have a detector tab open before they approve a milestone. Originality, GPTZero and the in-house classifiers that content marketplaces have rolled out keep getting better every quarter, and the bar a deliverable has to clear is a moving target. An AI rewriter that posts a great score in May often misses by October, by which time you may have multiple deliverables for that client in the archive that get re-checked.
The harder conversation is not the failed score. It is the follow-up question. "How was this prepared?" If your answer is calibration, pre-scanned with a detector, rewrote the six sentences that read AI-shaped, it is a workable thread. If the answer is a score-reduction AI rewriter set to Maximum, it is a much harder thread, and many agencies will quietly stop assigning. A score-reduction framing is a problem signal to a client, even when the deliverable itself was originally yours.
If you actually wrote the draft yourself with some AI assistance, the failure mode you should worry about is a false-positive flag, not a true-positive one. The fix is calibration, not score-chasing. Pre-scan with an honest detector. Look at the sentence-level highlights. Notice which rhythms read AI-shaped. Rewrite those specific sentences with the bundled ethical AI rewriter or by hand. Ship a deliverable that you can stand behind in any follow-up thread. That workflow holds up regardless of which detector the next client upgrades to.
TextSight is not a tool for converting fully AI-generated drafts into deliverables you did not write. We do not promise a permanent score-reduction guarantee, we do not market against agency integrity audits, and we do not consider a score-chasing workflow a problem we want to solve for paying writers. If that is the tool you need, Undetectable is the more honest fit, and the rest of this page can save you from buying the wrong thing.
TextSight Starter is $9.99 a month with detection and AI rewriter bundled. Pro is $19.99 a month with unlimited scans. Business is $39.99 a month with REST API, 5 seats and audit log for agencies. Undetectable.ai starts around $9.99 a month for an AI rewriter-only allowance with steep annual prepay discounts. The two prices buy different things.
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Yearly billing saves 25%. Verified .edu emails get Pro at $13.99/mo for student writers, billed monthly with no annual lock-in. Undetectable.ai does not publish an agency tier with audit log today. View full pricing →
You drafted with Claude, edited for voice, and the client runs every deliverable through Originality before approving the milestone. Here is the same afternoon with each tool, side by side.
Sign in, paste the full 2,000-word feature into the AI rewriter. Pick Aggressive mode, since you have no idea which specific sentences flag and the tool does not tell you. Wait for the rewrite. Read the output and notice the voice has shifted on multiple paragraphs, a few technical terms got swapped, the brand-voice quote from the client's interview got paraphrased into something blander. Spend 25 to 35 minutes patching the rewrite by hand to restore meaning, voice and the quote. Open a separate detector tab to verify against Originality, or trust the bundled detector that exists to validate the AI rewriter's own output. Total elapsed: 60 to 80 minutes. The submitted feature reads less like the writer the client hired and may have new inconsistencies in the next round of edits.
Paste the feature into the scanner. One scan returns the Authenticity Score, sentence-level highlights, and a Plagiarism Risk indicator. You see exactly which eleven sentences in the 2,000-word draft are pulling the score down, and which paragraph is the heaviest contributor. Click the bundled AI rewriter on those specific sentences in Standard mode, which rewrites them in place while preserving your voice, structure and the client quote. Re-scan. The score climbs from 41 to 84. Total elapsed: 20 to 25 minutes. The deliverable still reads like the writer the client hired, but in a register that does not get misread as AI by the next Originality pass.
The TextSight workflow is faster because you only rewrite what is flagged, and the rewrite engine targets the same signals the detector reads. The Undetectable workflow assumes the whole document needs rewriting because it has no way to point at specific sentences, and the most aggressive rewrite mode introduces its own client-visible signal in the form of inconsistent voice. Both paths can get you to a passing score on a specific detector. One gets you there in a third of the time and leaves you with a deliverable that is still recognizably yours, which is the whole point of being hired as a writer.
Both products are built by serious teams solving different problems. The honest writer answer is workflow-specific. Use this picker to match the tool to the freelance, agency-contracted or agency-owner setup you actually want to be in.
If your workflow is pure rewrite-and-ship with no client-side audit, Undetectable is the honest match. If your real worry is being misread as AI on work you wrote yourself, or defending an agency pipeline in client conversations, TextSight is what the calibration workflow was built for.
The full writer page. Voice match, client-side credibility, and the pre-send workflow for client deliverables.
See the writer page →How content shops use TextSight Business with REST API and audit log to defend agency deliverables.
Read the guide →The general head-to-head across all use cases. Calibration vs score-reduction, with the bigger feature table.
Read the compare →Full tier breakdown for Free, Starter, Pro and Business. Yearly billing saves 25%, Business at $29.99/mo yearly.
See pricing →Start with TextSight's free tier. No card, no signup, no commitment. Your first scan in about six seconds, with sentence-level evidence on the work you wrote yourself.