No responsible vendor ships a truly unlimited free AI detector. Every scan runs a transformer classifier on GPU compute that costs the vendor real money, so the tools that advertise unlimited free almost always rate-limit by IP under the hood, wrap the result panel in display ads, monetise the text you paste in, or silently downgrade the classifier at higher volume. TextSight Free is framed honestly: 3 scans per day at 5,000 characters per scan, the same transformer the paid tiers use, the same five-band Authenticity Score, the same per-sentence highlights, and no credit card ever collected. If you need real volume, Pro at $19.99 per month lifts the daily ceiling to 200 scans with API access. The published quotas appear in the dashboard sidebar and in API response headers.
Three structural realities make the phrase "unlimited free" impossible to apply honestly to AI detection. Knowing the reasons makes TextSight's published 3-per-day cap easier to evaluate against competitor marketing.
An AI detection scan runs a transformer classifier across every sentence, plots an Authenticity Score across the full distribution, and cross-checks the text against the stock phrasings GPT-4, GPT-4o, GPT-5, Claude, and Gemini tend to produce. That whole pipeline costs roughly a fraction of a cent per scan in raw GPU and bandwidth. Small at one scan, real money at the volume a single heavy free account can generate when nothing caps the request count. A vendor that promises literally uncapped free use is either subsidising scrapers with paying customers until the unit economics fail, throttling quality somewhere the marketing does not mention, or selling your scanned text to data brokers to close the gap.
A free account with no published ceiling becomes a target for content farms scoring scraped pages, LMS scraping scripts, prompt-injection-driven QA pipelines, and SEO operators auditing thousands of historical pages on someone else's GPU. The abuse degrades inference latency for legitimate students, writers, and teachers, and forces the vendor to introduce silent rate limits, IP-based blocks, or quality throttling that real users notice last. Publishing the actual quota up front (3 per day on Free) sets honest expectations and keeps the platform usable for the people the free tier was meant for.
A vague "unlimited" claim that throttles at an undocumented threshold is harder to work with than a published number, because you cannot tell whether the next scan will load instantly or be silently downgraded. The TextSight free tier publishes 3 scans per day so the workflow is plannable: one scan for the draft, one re-scan after the targeted edits, and one more for a friend's quick check. Real volume needs Pro at 200 scans per day, and the published 200 is also a real number rather than a marketing word.
Vendors marketing an unlimited free AI detector are almost always doing one of these four things under the hood. Knowing which one helps you evaluate the offer honestly.
ZeroGPT is the clearest example. The headline says unlimited and the dashboard never shows a hard counter, but the same browser running the same scan repeatedly hits a per-IP cooldown after a handful of requests. Power users notice immediately, casual users assume the tool is slow. The cap is real even when it is not labelled. TextSight publishes 3 scans per day on Free instead of hiding a soft cap behind unlimited marketing copy.
Several free detectors wrap the result panel in display ad networks and reserve broad rights over user-pasted text in the privacy policy. Your drafts may be cached, profiled, or sold to data brokers to fund the gap between marketing copy and unit economics. TextSight runs no third-party ad networks on any tier, does not sell user text, and does not use scanned content for model training.
A few tools quietly switch to a cheaper distilled-classifier variant once a free account crosses internal scan-count thresholds. The first scan of the day uses the full transformer; the eighth uses the distilled model. Users do not see the switch, but scores get noticeably noisier and false-positive rates climb. TextSight does not throttle quality on any tier: Free, Starter, Pro, and Business all use the same classifier.
The most aggressive misuse. A free tool advertises unlimited AI detection, but the unlimited part lasts until the first 200-character demo result, after which a paywall covers the highlights. TextSight's free tier is honestly framed: 3 full 5,000-character scans per day, full result panel with sentence highlights and Authenticity Score on every one of them, no paywall covering the output.
The numbers below are the actual daily AI-detection scan quotas. They appear in the dashboard sidebar, in API response headers, and on the billing page. Full details on the pricing page.
Billed $89.88/year — Save $30
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Workloads above Business: sales@textsight.ai for custom enterprise quotas and bulk API pricing.
The 3-per-day cap sounds small in the abstract. In a real student or casual workflow it covers most of the use cases people open a free AI detector for. Here is where Free is genuinely enough.
A typical college essay sits inside 5,000 characters, so a single TextSight Free scan covers the whole draft in one request. Scan once, read the result, edit the few sentences the detector flags, scan again to confirm the fix landed. That is two scans, with one in reserve for a friend who wants a quick check on theirs. Most students who use Free in this mode never bump into the daily ceiling.
If you generated a long-form email, a cover letter, or a draft reply with ChatGPT or Claude and want to know how AI it reads before pasting it into Gmail, that is one Free scan. The full 5,000-character cap covers most professional emails comfortably. Three of those a day covers a normal week of one-off generations without ever pushing the limit.
If you publish one blog post a week and want to verify the draft before it goes live, the Free tier handles that workflow end to end. Scan, read, rewrite the few flagged sentences by hand, scan again. If the post is longer than 5,000 characters it splits into two requests, which still leaves one scan of headroom.
The biggest job the free tier does is letting you evaluate the actual detection quality on your own text before committing to a paid plan. Three scans is enough to test the classifier against a known-AI draft, a known-human draft, and an edited hybrid, and form a real opinion about whether the scores feel calibrated to your category. That is the whole point of an honest free tier.
Three patterns where Free runs out and the right next step is Pro at $19.99 per month, or Business for editorial teams. The published Pro and Business quotas are real numbers, not marketing words.
The moment AI verification becomes a daily habit (every essay, every email, every blog post, every draft reply) you will burn 3 scans by lunch. Pro at 200 scans per day absorbs that habit comfortably and leaves room for re-scans after every edit. The per-model fingerprint flagging GPT-4, GPT-4o, GPT-5, Claude, and Gemini matters more in this mode, because you start needing to know not just whether the text reads AI but which model likely produced it.
An active freelancer publishing 5 to 10 long-form pieces a week, verifying drafts during writing, hits roughly 30 to 50 scans per workday at peak. The free 3-per-day cap covers maybe one draft per day. Pro is the natural baseline for this profile, and the unlimited sentence-level highlights plus URL upload (paste a published URL and TextSight scrapes the content) matter for the review-then-edit-then-rescan loop.
A class of 30 essays is 30 scans, and the Free tier covers exactly one of those before the daily ceiling. Pro at 200 scans per day covers two full class sets a day with margin for re-scans after suspect papers come back from revision. The five-band Authenticity Score and per-sentence highlights matter more than raw scan count for this profile, because the conversation with a student needs evidence (which paragraph, which span) rather than a single percentage.
A small agency vetting 50 freelance submissions a week, stress-testing every client deliverable before line edits, sits inside Business. The unlimited-in-practice scan ceiling plus 5 team seats and full REST API access scope cleanly to this workflow. White-label PDF reports and the per-model fingerprint matter most for client-facing deliverables where the agency needs to defend a recommendation.
Several detector vendors quietly downgrade the free-tier classifier to a cheaper variant. TextSight does not. The constraint between tiers is daily quota, never per-scan quality.
Free, Starter, Pro, and Business all run the same transformer-based classifier on every scan. A Free 3-scans-per-day account scoring a 1,200-character draft and a Business unlimited-in-practice account scoring the same text return the same Authenticity Score, the same five-band classification, and the same per-sentence highlights. The model fingerprint that distinguishes GPT-4, GPT-4o, GPT-5, Claude, and Gemini is also identical across tiers. Free is a real evaluation surface, not a watered-down demo.
If you hit a per-minute or per-day burst limit, the API returns a 429 status with the remaining quota and reset window in the response headers, and the dashboard shows a clear in-line message. The scan never silently returns a lower-quality score to manage server load. This matters because a silently degraded scan is the worst possible failure mode: you do not know it happened, you act on a noisier number, and you blame the classifier instead of the throttle.
Every API response includes the remaining daily scan quota, the daily and per-minute rate limits, and the reset windows. Build the integration once against the headers and your pipeline knows exactly when it is about to hit a wall, with enough warning to slow down, batch differently, or route to a higher tier. No surprise mid-day wall, no opaque "you have been throttled" email after the fact.
The main AI-detector landing page covering every major LLM and the five score bands.
Open detector →Same honest framing for the ChatGPT-specific detector across every tier.
See the quotas →Same 3-scans-per-day free tier focused on ChatGPT outputs and per-model fingerprinting.
See the free tier →Full tier breakdown for Free, Starter, Pro, and Business. Yearly saves 25%.
See pricing →Free 3 scans per day at 5,000 characters each, same classifier as Pro and Business, no card required, no trial countdown, no ad walls. Upgrade to Pro at $19.99 per month only when daily volume outgrows the published quota.