Promptless: Product, team and how it was built
Promptless (AI agent that drafts updates to customer-facing documentation, United States): Live with a published price list and named users, November 2026. Evidence grade E: no revenue figure was checked. Team: 2 founders; 4 people in October 2025; 5 people in March 2026 and on the Y Combinator page. Launched 5 February 2025; still running.Added
- Outcome
- Live with a published price list and named users, November 2026
- Evidence
- E no revenue figure was checked
- Launch
- 5 February 2025
- Status
- Still running
- Team
- 2 founders; 4 people in October 2025; 5 people in March 2026 and on the Y Combinator page
- Outside funding
- Y Combinator Winter 2025 batch; the directory VCBacked lists US$500K pre-seed in March 2025, not confirmed by the company
- Main channel
- Not stated
What is not verified
No revenue figure was found. We looked for a payment-processor profile, a founder interview with numbers, a filing and a funding announcement. That customers pay is the company's own statement. Its documentation describes a Billing page for "organizations on a paid plan", and its privacy policy describes purchases. No page states how many customers pay or names one that pays. The closest is a home-page quotation in which a named customer says the product "basically pays for itself". No independent source confirms that a named customer pays. A reader could ask a named customer whether it pays. This story is grade E: the business is real and its product, price and customers are described from public pages, but no revenue figure was checked. Aiolum shows it as an idea worth studying, not as proof that it makes money.
Promptless is an AI agent, a program that takes steps on its own after something happens, for customer-facing documentation. A pull request, a Slack thread about docs or a docs ticket wakes it. It then decides whether the docs need a change and drafts one. A writer reviews it, edits it and publishes it, or the agent opens a pull request, a proposed change to files in a code repository.
Prithvi Ramakrishnan and Frances Liu founded it in 2024 and joined the Y Combinator Winter 2025 batch, according to the Y Combinator company page. The company's pricing page lists a Startup plan at US$500 a month with a 14-day free trial. It lists a Growth plan at US$500 to US$1,000 a month and a custom Enterprise plan. The company's blog names customers such as Vellum, and a blog post of the Mautic open-source project describes about four months of use.
No revenue figure was found, so the story is grade E. The company's own pages describe paid plans and billing, and no independent source confirms that a named customer pays. Several named users are open-source projects, which the company says can use Promptless for free.
Why did Promptless work?
Four causes, in the order they mattered. Each one is a reusable lesson.
The founders had seen docs fall behind at a past employer
Ramakrishnan wrote on 1 March 2026 that docs could not keep up at Bond, where he was VP of Product and Engineering. They covered card issuing and compliance. He wrote that a dedicated developer-experience team failed for lack of context. The Y Combinator page lists Liu's earlier work on machine learning at Cloudflare and OneSignal.
Drafts start from events, so no one has to write a prompt
The home page says a pull request, a Slack thread or a ticket wakes the agent. The company writes that every suggestion has citations to code, Slack or tickets, so a reviewer can check it. The name Promptless refers to this design.
Open-source projects show the work in public
The home page says commits to the Vitess and Helm docs are public. These projects can use the product free, so they show the output but not a payment. Mautic's own post gives the only outside measure found.
How it was built
These details come from the company's own pages and are grade C, unless the line says otherwise. [6, 1, 8]
- The company's blog says it rebuilt its codebase from scratch in March 2026 so that coding agents could work in it. It says human review of pull requests became optional.
- The docs site is built with Astro and its Starlight theme, as its page source states, and loads PostHog, a product analytics service.
- The company says it planned to list the rewrite's requirements as Linear issues. It cites Weave's models for its engineering output.
- Card payments run through Stripe's hosted billing portal, per the company's account documentation.
Tools named in the sources
Each one opens its page in the Tools tab, with every story that uses it.
Who tried this before Promptless, and why did they fail?
Two companies in our database of failed startups tried to share or automate knowledge for customers and failed. The values below are from that database and are not independently verified.
TomoGuides
The promiseA platform where people create and share multimedia guides.
Why it diedThe record says it did not find a unique niche among larger platforms and had high content costs.
Answerly
The promiseEmbedded FAQ answers that cut the number of customer support tickets.
Why it diedThe record says the promise did not match how customer service works.
The failed startups come from our database of 1,749 dead startups, retold here in our own words. Its entries are AI-assisted summaries of public sources, so these cards carry no evidence grade.
What changed
TomoGuides relied on people to write guides, and its record names the high cost of content. Answerly matched questions to answers that people had written in advance. Promptless starts from the change itself and lets a model draft the text.
Whether the drafts are good enough to pay for is not settled by the sources found. Mautic's post says reviewers still caught errors in drafts, such as a button that no longer exists.
Can one person copy Promptless now?
A narrow version is possible for one person.
The method is a trigger plus a draft plus a reviewer, aimed at one platform's docs. A founder who knows one docs system well could start there. The company's own pages show how much integration work a general version needs.
Where it is still open: Docs for one framework, one API product or one open-source community, where a few reviewers see the drafts.
- 1Pick one docs platform and one trigger, such as a merged pull request.
- 2Draft the change with citations to the code or ticket that caused it.
- 3Give a human reviewer one place to accept, edit or reject each draft.
- 4Offer a free plan to open-source projects to get public examples.
How much revenue does Promptless make?
Each row shows the evidence grade and the source numbers from the list at the end of this page. The grades are explained in How Aiolum verifies.
| Fact | Value | Grade | How we know | Sources |
|---|---|---|---|---|
| Status, November 2026 | live product with a published price list and a 14-day free trial | C | Pricing page read on 11 November 2026: "All plans include a 14-day free trial." | [2] |
| Startup plan price | US$500 a month, up to 200 pages | C | The company's pricing page. Growth is listed at "$500-$1,000/mo" and Enterprise as "Custom". | [2] |
| Company start | 2024; Y Combinator Winter 2025 batch | C | Y Combinator company page: "Founded: 2024", "Batch: Winter 2025". Its launch post is dated 5 February 2025 in the page data. | [3] |
| Founders | Prithvi Ramakrishnan and Frances Liu | C | Y Combinator page. Ramakrishnan signs company blog posts as co-founder. He was earlier VP of Product and Engineering at Bond; she led product and machine learning at Cloudflare, OneSignal and Graft. | [3, 4] |
| Team size | 5 people | C | Y Combinator page: "Team Size: 5". An engineer's quote in a company post about March 2026 speaks of a "5-person company". In October 2025 the company wrote of "two technical founders and two engineers". | [3, 5, 6] |
| Funding | US$500,000 pre-seed, March 2025, per a directory | D | VCBacked lists this round with Y Combinator, Pioneer Fund and SAV as investors. The Y Combinator page states no amount, and no company page confirms it. | [13, 3] |
| Named customer: Vellum | 54% of its docs pull requests in one month came from Promptless suggestions | C | The company's case study of 1 July 2025, written by the co-founder. It says Vellum adopted Promptless six months earlier. It does not say what Vellum pays. | [7] |
| Named user: Mautic | 129 docs pull requests merged in about four months | C | Mautic's own blog post of 3 September 2026. It does not say whether Mautic pays. | [9] |
| Free plan for open-source projects | free for CNCF, Linux Foundation and other eligible non-commercial projects | C | Company documentation, Open Source Program. The company's home page calls Vitess and Helm open-source CNCF projects. | [8, 1] |
| Billing | paid plans exist; cards are handled by Stripe | C | Company documentation: the Billing page is "visible only to Admin users in organizations on a paid plan". Its example row shows "Promptless Startup" at "$500/month". | [8] |
| Earlier name | none found | C | The terms (revised 3 April 2025) name the company "Promptless, Inc." and the site gopromptless.ai, which redirects to promptless.ai. A founder wrote that the company took the name before it chose documentation. | [11, 4] |
| Time from launch post to the status fact | 21 months | calc | Calculated: 5 February 2025 to November 2026. | [3, 2] |
How to read this table: a grade C value is a statement by the company or its founders on their own pages. The Y Combinator page is also grade C, and so is the Mautic row, a user's own account. The grade D value comes from a directory. A "calc" value was computed on this page. No revenue figure exists.
| Plan | Per month, billed yearly (US$) | Per month, billed monthly (US$) | Limit |
|---|---|---|---|
| Docs: Startup | 500 | up to 200 pages; Slack and GitHub integrations; 14-day free trial | |
| Docs: Growth | from 500 | US$500 to US$1,000 a month for 200 to 5,000 pages | |
| Docs: Enterprise | custom | unlimited pages, audit logs, custom integrations | |
| Agent Instructions: Startup, Growth, Enterprise | custom | fewer than 50, 50 to 200, more than 200 agent instructions; no amount shown |
The pricing page lists the Startup plan at US$500 a month and says all plans include a 14-day free trial. It does not say whether a yearly price exists. The Growth plan is US$500 to US$1,000 a month by documentation size, and Enterprise is "Custom". The new Agent Instructions product lists three plans by the number of agent instructions, each with "Contact us" and no amount.
When did Promptless launch, and how did it grow?
From a company founded in 2024 to a price list and a second product in November 2026. Each entry carries its grade.
- 2024CFounding year on the Y Combinator page. The page lists San Francisco as the location. [3]
- 5 February 2025CThe company's launch post appears in the Y Combinator launch list, during its Winter 2025 batch. [3]
- 1 July 2025CThe company publishes the Vellum case study, which names Vellum as a customer for six months. [7]
- 31 March 2026CThe company moves its last customers to a rebuilt codebase, which it had started about two weeks before 14 March. A later post says 3 to 5 times more output per engineer followed. [6]
- 3 September 2026CMautic reports that 129 Promptless docs pull requests were merged in about four months. [9]
- 11 November 2026CThe pricing page lists the docs plans and a new Agent Instructions product, each with a 14-day free trial. [2, 1]
What could go wrong for Promptless?
The risks are the mirror image of the causes above.
What is not verified
No revenue figure was found. We looked for a payment-processor profile, a founder interview with numbers, a filing and a funding announcement. That customers pay is the company's own statement. Its documentation describes a Billing page for "organizations on a paid plan", and its privacy policy describes purchases. No page states how many customers pay or names one that pays. The closest is a home-page quotation in which a named customer says the product "basically pays for itself". No independent source confirms that a named customer pays. A reader could ask a named customer whether it pays.
Named customers and open-source projects
The home page quotes named people at Prove, Vellum, Latitude.sh, Bazel and Runpod, and says it serves "Fortune 500 enterprises". It also shows a row of 14 logos, among them Aptible, Basis, Coactive, Flatfile, Megaport, Mezmo, Miter and Rain. No customer page names which of them pay. We searched for four of the five quotations and found them only on the company's pages. Vitess, Helm and Mautic are open-source projects, which the company's program can serve for free.
Counters on the home page
The home page shows figures such as "Token Spend ↓ 18%" and an example report of "482 sessions" for the new Agent Instructions product. The page does not say whether they come from customers or from an example.
Team and funding
The team size of 5 comes from the Y Combinator page and one engineer's quote. No company page gives a funding amount. The directory VCBacked lists US$500,000 raised in a pre-seed round in March 2025, from Y Combinator and two funds. The Internet Archive lists copies of the pricing page from August and November 2025, which we could not open.
Sources
The grade next to each source is the best grade that the source can support. "Read in full" means that the text of the page was downloaded and the numbers were checked in it.
- C Promptless home page, read 11 November 2026Read in full. Source for the product, the testimonials, the open-source claim and the Agent Instructions product.
- C Promptless pricing page, read 11 November 2026Read in full. Source for the plans, the prices and the 14-day trial.
- C Y Combinator company page: PromptlessRead in full, with the page data. Source for the founding year, the batch, the founders and the team size.
- C Promptless blog, 1 March 2026: Why we're building PromptlessRead in full. Written by the co-founder. Source for the founder's earlier work and the choice of name.
- C Promptless blog, 1 October 2025: Running a Lightweight Research Paper ClubRead the opening paragraphs. Source for the team of two founders and two engineers.
- C Promptless blog, 28 August 2026: 6 months ago, we rebuilt our codebase from scratchRead in full. Source for the rebuild dates, the "5-person company" quote and the tools named.
- C Promptless blog, 1 July 2025: How Vellum uses Promptless to draft over 50% of their doc updatesRead in full. A case study by the company. It does not say what Vellum pays.
- C Promptless documentation: account management and the open-source quickstartRead the Billing section in full, and the Open Source Program section of the quickstart. Source for the paid plan, Stripe and the free open-source program.
- C Mautic blog, 3 September 2026: How Mautic pairs Promptless with human review to catch up on docsRead in full. A user's own account, with merged pull request counts. It does not say whether Mautic pays.
- C HUGE Magazine, 8 January 2026: Promptless Fixes the Docs Nobody Wants to UpdateRead in full. A short feature that retells the Y Combinator profile and the home-page testimonials. It adds no figure.
- C Promptless terms of use (revised 3 April 2025) and privacy policyRead the opening of the terms and the privacy policy for the company name, the site name and the billing statements.
- C Database of failed startups, local exportRecord pages read on the website on 11 November 2026. AI-written summaries, not independently verified. Source for the failed predecessors.
- D VCBacked: Promptless funding and investors, data dated 12 March 2025Read in full on 11 November 2026. A directory page. Source for the funding amount only.
Run this company? Send corrections or a verified figure to aiolum@livyden.com