How many prompts should you track for AI visibility?

Behind 'how many prompts' sit different questions. Am I named at all today? That is a diagnosis, and a handful of prompts answers it in an hour. Is my visibility moving? That is a measurement, which needs the same prompts asked every week, with enough answers behind each reading that sampling noise cannot move it on its own. Do I know where I stand across everything buyers ask? That is coverage, and it needs a set that spans the buying journey for every product you sell. The arguments between 5, 40 and 1,000 are mostly people answering different questions.

Five buyer-phrased questions in a temporary chat, scored as you go, tell you whether you are on the shelf at all, which is what the 30-minute audit does. Ten queries across three assistants gives thirty answers, enough spread to sort you into invisible, misdescribed or outranked, which is the one-hour method to check if your business is visible in AI search. The free AI visibility check sits in the same range: it runs up to 10 buyer-style prompts about your brand through Claude with live web search, with no login, and shows the competitors ahead of you and your citation gap; paid plans also cover ChatGPT, Perplexity, Gemini, Copilot, Google AI Overviews and Google AI Mode.

None of these can tell you next month whether anything changed: ten prompts run once are a snapshot, and the same ten run again a month later are two snapshots with no way to say how much of the difference is noise.

The noise argument sets the floor, and it is counted in answers. A single AI answer is one sample from a model that varies its output, so a weekly reading built on a handful of answers is mostly that variation, and the trend line means little. 10 fixed prompts asked every night on each of the six AI services besides Claude, and on Claude once a week, puts 430 answers behind every 7-day reading, so one odd answer is one in 430. A move of a few points is then worth a look, and a move that holds across two or three consecutive weeks is worth acting on. The same 10 prompts asked of one assistant would be 10 answers, where one odd answer is one in 10, so if you check fewer services, check more prompts.

On Discoverable's plans, each brand and each product line has 10 tracked prompts, the ones you confirm, asked every night on every AI service (Claude on Monday nights), and the rest of its share of the plan's prompts is asked once a month.

The rest of the set does a different job. It shows where you stand across everything buyers ask, and one reading of each of those prompts a month shows the gaps worth working on, for about a quarter of the answers that asking them weekly would take.

Every night, read seven days at a time, is deliberate. AI answers change from one asking to the next, so one reading a week can catch a lucky or an unlucky answer; seven readings pooled into the last 7 days keep one answer from moving the number far, and the week is still the unit the trend is drawn in. Four weekly readings give you a direction, and eight give you a trend you can put in front of a board. Two rules: freeze the set, because every prompt you swap breaks the line, and keep branded prompts under ten per cent of it, because asking about your own name measures description accuracy rather than recommendation. What is prompt coverage? sets out how to build and validate the set.

50 prompts is the size at which one product's buying journey is covered rather than sampled: research questions, category questions, a comparison against each serious rival, use-case questions, pricing and fit, and a few branded checks, each in the several phrasings buyers actually use. On Discoverable's Growth plan the 10 tracked prompts are checked every night on every surface (Claude on Monday nights) and the remaining 40 monthly, which works out at about 1,800 AI answers analysed a month. That arithmetic is what keeps a nightly reading affordable.

150 prompts, shared across a company's brands and product lines, is for companies with more than one thing to measure. A business with four product lines needs a prompt set per line, because a blended score hides the line that is invisible; Discoverable's Scale plan tracks up to 5 product lines per brand, each with its own prompts, competitors and score (product-line tracking). Markets multiply the set again, because answers differ by country and language. Engines expand each prompt into sub-questions, so the fan-out behind 50 head prompts can run to several hundred. At that size each brand's and each product line's 10 tracked prompts still run nightly and the rest monthly, from about 2,400 answers a month.

As of 7 October 2026, the published self-serve plans in the comparison on our plans and prices page track up to 500 custom prompts, checked daily. Prompt research is how you fill a set that size with questions buyers actually ask.

Guides on this site quote different prompt counts because they answer different questions. Read each against its purpose.

5 prompts: the 30-minute audit's first step, a checklist diagnosis scored 2, 1 or 0 per answer.

10 prompts: the one-hour audit, the Perplexity citation guide and the free check, a first diagnosis with enough spread to name the pattern.

10 to 20 prompts: the startup guide's first tracked set, measured from a zero baseline.

20 prompts: the manual AI visibility audit in the glossary, about the most a spreadsheet survives when every engine is checked by hand.

20 to 40 prompts: the share-of-voice guide's workable set for weekly manual measurement, and 20 to 50 the share-of-model entry's prompt panel, both limited by how much checking a person keeps up with.

40 prompts: the prompt-coverage entry's example of coverage across a buying journey, against two as an anecdote.

10 tracked prompts: the weekly trend's set, what every check asks of each brand and product line, asked every night on every surface (Claude on Monday nights) on the paid plans (430 answers a week), with the rest of a plan's prompts monthly.

50 and 150 prompts: the product's tiers, where a tool rather than a person does the checking, so the ceiling is set by coverage rather than by effort.

None of these is wrong. A handful asked by hand is a diagnosis. 10 fixed prompts asked every night on every AI service (Claude on Monday nights), 430 answers a week, is a measurement. From 50, you are covering a journey, and from 150 you are covering a company. Pick the number for the question you are actually asking, and if the question is whether your visibility is moving, the answer is the same 10 fixed prompts every night on ChatGPT and every other AI service your buyers use (Claude on Monday nights), with the rest of your set asked monthly.