Lever, Greenhouse and Ashby, compared as an applicant
The short answer
The three systems ask you for nearly the same information. What changes is not the substance of the form but its shape: how many steps it takes to get through, how much you can see before you start, and how forgiving the page is about autofill and resume parsing. Every board in the employer graph we track runs on one of these three, Greenhouse, Lever, or Ashby, and the same universal fields showed up regardless of which one was running underneath a given posting.
What stays the same no matter which one you land on
Across the 20 jobs we measured, the six core fields, first name, last name, email, phone, resume, LinkedIn, appeared every time, independent of the system behind the page. So did the general shape of the screener questions: work authorization, sponsorship, location, referral source, prior employment, and a closing EEO section. If you have those answers ready, it does not much matter which of the three you are looking at. You are answering the same questions in a different order with different labels.
Greenhouse: read it before you load it
Greenhouse publishes its full form definition at a public endpoint, every field, its type, and whether it is required, before the page ever renders in your browser. That makes a Greenhouse-hosted posting the easiest of the three to plan for in advance, since nothing about the form is a surprise once you know where to look. The mechanics of that are covered fully in Greenhouse shows you the form before you apply.
Ashby: the same idea, a different door
Ashby exposes a comparable amount of information, but through a GraphQL endpoint rather than a plain web address, and with introspection turned off, so its shape has to be probed rather than requested outright. Once you have it, the resulting form looks and behaves like any other: sectioned fields, a required flag on each one, the same core questions in Ashby's own labeling. As an applicant you would not notice the difference from Greenhouse at all. The form simply loads and asks what it asks.
Lever: what you see is what you get
Lever does not offer that same look ahead. There is no equivalent public form definition to read before the page loads, so the first time you see the full set of fields and questions is when the application actually renders in your browser. That does not make a Lever form harder to fill out. It tends to present as a single scrollable page rather than a multi-step wizard, which some applicants find faster precisely because there is no back-and-forth between screens, only more to look at once you land on it.
Where the real differences show up
Set the backend aside and the differences that actually affect you as an applicant come down to three things. First, page structure: some systems break the form into steps with a progress indicator, others put everything on one page you scroll through. Second, resume parsing: upload a resume and most of these systems attempt to autofill your name, email, and work history from it, with results that range from clean to requiring a fix on nearly every field, which is the one place the file you upload genuinely matters: PDF or Word, which file to upload covers the two exceptions worth knowing. Third, where the cover letter sits: sometimes it is bundled into the resume upload step, sometimes it is its own separate optional field further down the page. None of this changes what is being asked. It changes how much friction there is in answering.
A few habits that help regardless of the system
Multi-step forms sometimes lose typed answers if you use the browser's back button instead of the form's own navigation, so anything longer than a sentence, an answer to an open-ended screener question, a cover letter, is safer drafted in a separate document and pasted in than typed directly into a field you might accidentally navigate away from. Single-page forms do not have that particular problem, but they make it easier to lose your place if you get interrupted partway through, since there is no step indicator reminding you what is left. Neither failure mode is really about Lever, Greenhouse, or Ashby specifically. Both are just what happens when a long form meets an ordinary interruption, and both are avoidable with the same habit: write anything substantial somewhere else first, then paste it in.
Does this actually make one easier than the others
Applicants sometimes ask which of the three is worth hoping for when a posting turns out to be hosted on it. The honest answer is that none of them meaningfully advantages you. A Greenhouse form and a Lever form asking for the same six fields and the same screener questions take about the same amount of time to complete once you already know your answers, whether or not the page shows a progress bar along the way. The visible differences, step count, autofill quality, where the cover letter field sits, are real but small, on the order of a minute or two either way. What actually determines how long an application takes is whether you have already worked out your answers to the recurring questions, not which of the three systems happens to be running the page that day.
Why the system underneath rarely matters as much as it seems to
It is tempting to develop a preference, to decide Greenhouse forms are easier or Lever pages move faster. In practice the system is a function of what applicant tracking software the employer bought, not a signal about the company or the role. The form you actually care about lives on the employer's own board, not on whatever aggregator originally pointed you there, and a posting mirrored across five job boards is still, underneath, one Greenhouse, Lever, or Ashby form with one real set of questions. Why that distinction matters when you are deciding where to even start looking is covered in company job boards versus aggregators.
For the full pattern behind what any of these forms ask, independent of which of the three is running the page, see what ATS application forms actually ask for.
iapplyai.app works against all three systems the same way, reading each employer's actual form and pre-filling it against your resume, so which platform a company happens to use stops being something you have to think about at all.
