A truly unlimited ChatGPT detector does not exist at any responsible vendor. Every scan runs a transformer classifier on GPU compute that costs the vendor real money, so a literally uncapped plan would either invite abuse and collapse the unit economics, or quietly funnel users into ads, data resale, and silent quality throttling. TextSight publishes exact per-tier scan quotas instead: Free 3 scans per day at 5,000 characters each, Starter 50 scans per day, Pro 200 scans per day, Business unlimited in practice for any real workflow plus 150,000 AI rewriter words per month and full REST API access. The numbers appear in the dashboard sidebar, in API response headers, and on the billing page.
Three structural realities make the word "unlimited" impossible to apply honestly to ChatGPT detection. Knowing the reasons makes the published quotas easier to evaluate.
Every detection request runs a transformer classifier across each sentence, plots an Authenticity Score across the full distribution, and looks for the stock phrasings GPT-4, GPT-4o, and GPT-5 tend to produce. The pipeline costs a fraction of a cent per scan in raw GPU and bandwidth. Small at one scan, real money at the volume a single heavy account can generate when nothing caps the request count. A vendor advertising literally uncapped detection at a competitive price is subsidising heavy users with light users 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.
An account with no published ceiling becomes a target for content farms scoring scraped pages, LMS scraping scripts, and prompt-injection-driven QA pipelines. The abuse degrades inference latency for everyone else and forces the vendor to introduce silent rate limits, IP-based blocks, or quality throttling that legitimate users notice last. Publishing the actual quota up front sets honest expectations and lets writers, teachers, and editors plan around real capacity instead of guessing at hidden walls.
A solo writer verifying every ChatGPT draft they produce in a long workday is around 20 to 30 scans, comfortably inside Pro at 200 scans per day. A classroom teacher reviewing a class of 30 essays is 30 scans, also inside Pro. An agency editor stress-testing 50 freelance submissions a week sits inside Business. This is much easier to plan around than a vague "unlimited" plan that throttles at an undocumented threshold or wraps the result panel in advertising.
The word gets used four different ways in ChatGPT-detector marketing. Knowing which one matters to your workflow narrows the buying decision considerably.
Some tools cap each individual scan at 1,500 or 3,000 characters. A 5,000-character article has to be split into chunks, scanned separately, and stitched together by hand. "Unlimited" in this sense means you can paste a whole document and the detector handles it in one pass. TextSight caps each individual scan at 5,000 characters on Free and lifts the per-scan cap on Pro upward, which covers most ChatGPT outputs, essays, and blog posts in a single request.
Some plans cap you at 30 or 50 scans per day even when each one is small. By scan 51 you are locked out until the next reset. "Unlimited" in this sense means you can keep clicking Scan without watching a counter tick down. TextSight publishes the actual daily counts (Free 3, Starter 50, Pro 200, Business unlimited-in-practice) instead of marketing copy that contradicts the inner billing page.
This is what most users actually want. They do not want literally infinite scans; they want a ceiling so far above their real usage that it never enters the workflow. Pro at 200 scans per day covers a heavy reviewer comfortably. Business removes the daily ceiling for any normal workflow while still keeping the platform usable for everyone else. This is the honest sense of "effectively unlimited", and TextSight ships it as Business.
This does not exist at any responsible vendor. A tool that lets a single account run 100,000 scans a day would be flooded by spammers and scraping scripts within a week, and the unit economics would collapse. If a vendor advertises this, the caps are hidden somewhere you have not found yet, the quality silently degrades at high volume, the result page is wrapped in advertising that funds the gap, or the company is burning runway that will run out.
The numbers below are the actual daily ChatGPT-scan quotas. They appear in the dashboard sidebar, in API response headers, and on the billing page. Full details on the pricing page.
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Workloads above Business: sales@textsight.ai for custom enterprise quotas and bulk API pricing.
Most ChatGPT-detector vendors marketing unlimited plans are doing one of four things under the hood. Here is what is happening beneath the headline.
ZeroGPT is the clearest example. The free unlimited tier is wrapped in ad networks that load on every result panel, and the privacy policy reserves broad rights over the text users paste in. Your ChatGPT 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 and does not sell or train on user-pasted text on any tier.
Some vendors advertise unlimited scans but cap the total monthly throughput somewhere in the fine print, often 150,000 to 300,000 words per month. For a solo writer that is generous; for a small editorial desk it is restrictive. The cap is real even when the marketing copy says otherwise. The cleanest tell is when the sales page says "unlimited" but the dashboard sidebar shows a usage bar with a hard ceiling.
A few tools quietly switch to a cheaper distilled-classifier variant once a single account crosses internal scan-count thresholds. The first 50 scans of the day use the full transformer; the 200th uses the distilled model. Users do not see the switch but the scores get noticeably noisier, false-positive rates climb, and the per-sentence highlights become less precise. TextSight does not throttle quality on any tier.
Even on plans marketed as unlimited, many vendors apply a 60-second or 5-minute cooldown between scans once an account exceeds a burst threshold. Casual users never notice; power users notice immediately. The headline plan is unlimited; the practical experience is throttled. TextSight publishes its rate limits in API headers and does not change them silently.
The most aggressive misuse. A free tool advertises unlimited ChatGPT detection but the unlimited part lasts until your first 200-character demo, after which a paywall appears. TextSight's free tier is honestly framed as 3 scans per day at 5,000 characters each, resetting daily, with no "unlimited" claim attached to the free experience.
Most users never come close to a Pro daily ceiling. The accounts that bump into volume walls fall into a few specific categories, and the right tier is different for each.
A student verifying their own work before submission, or a casual user sanity-checking a ChatGPT reply before sending it, lands inside Free at 3 scans per day. Once that becomes a daily habit (every essay, every draft email, every assignment) Starter at 50 scans per day covers a full study week with margin. Anonymous pre-signup scanning is also supported up to a small lifetime cap.
An active freelancer or content marketer publishing 5 to 10 long-form pieces a week, verifying drafts during writing, hits roughly 30 to 50 scans per workday at peak. Pro at 200 scans per day absorbs the daily peak comfortably and leaves room for re-scans after edits. Per-model fingerprint and unlimited sentence-level highlights matter most for this profile, since the workflow is review-then-edit-then-rescan.
A class of 30 essays is 30 scans. Two classes per week is 60. Pro covers this with margin and leaves headroom for re-scans after suspect papers come back from revision. The five-band Authenticity Score and sentence-level 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, comfortably uses 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 often matter for client-facing deliverables.
Publishers running every contributor draft through automated AI checks, LMS platforms flagging every submission before a human reviewer sees it, internal comms teams scanning every external email or doc, SEO teams auditing thousands of historical pages before a Helpful Content review. These workloads exceed Business and move to a custom enterprise contract through sales@textsight.ai with bulk API pricing tied to actual throughput.
Several detector vendors quietly switch to a cheaper classifier variant once an account crosses internal volume thresholds. TextSight does not. The constraint is the per-tier scan quota, never the per-request 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 ChatGPT output 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.
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 will know 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.
The main ChatGPT-detector landing page covering every GPT version and the five score bands.
Open detector →3 scans per day on the free tier explained. Same classifier as paid, no card required.
See the free tier →High-volume scanning with the API, batch queue, and team workflows for agencies and teachers.
See the bulk path →Full tier breakdown for Free, Starter, Pro, and Business. Yearly saves 25%.
See pricing →Free 3 scans per day, Starter 50, Pro 200, Business unlimited-in-practice. Same classifier on every tier, no ads, no hidden caps, no fine print. Start free and upgrade only when you outgrow the published quota.