An applicant tracking system (ATS) is software that collects job applications in one place and tracks every candidate from "applied" to "hired", so nobody gets lost in an inbox and every hiring decision has a record behind it. If you have ever searched "what is an applicant tracking system" after a job post brought in 70 resumes by email, this is the tool that solves that problem.
This plain-English guide explains what an ATS does for employers, how it compares with a spreadsheet or an HR system, how AI resume screening works inside it, and a five-question test for whether your business needs one. There is a short section for job seekers at the end. We make a lightweight AI ATS, the Hiring template in KissMySkills AI Recruiting, and we will say where it fits, but this is an explainer first.
ATS in one sentence
An ATS is a database of candidates with a pipeline on top: every applicant gets a record, every record sits in a stage (applied, screen, interview, offer), and the software helps you move people through those stages and talk to them along the way.
So what is ATS in recruiting and HR? The same thing. Recruiters say "the ATS" the way salespeople say "the CRM": the system of record for hiring.
What an ATS does: the hiring flow
Every ATS, from a free tool to an enterprise platform, follows the same basic flow:
- Job. You create a job with a description, requirements and the questions you want applicants to answer. Many ATS tools publish it to a careers page and job boards.
- Application. Candidates apply through a form. The ATS stores their resume, answers and contact details as a candidate record.
- Screening. You (or AI) review applicants against the job and move the promising ones forward. Others get a polite rejection, ideally automatic.
- Interview. The ATS schedules interviews, shares the candidate's record with interviewers and collects their feedback.
- Offer. You make an offer, track the answer, and mark the hire. Good tools then hand the new employee to your HR or payroll system.
Around that flow, an ATS also keeps a history: who applied, who reviewed them, what was decided and why. That record is useful when you hire for the same role again, and it helps you show you treated candidates consistently.
| Hiring step | Without ATS | With ATS | With AI ATS |
|---|---|---|---|
| Post the job | Copy-paste into each site | One form, posted to a careers page and boards | Same, plus AI help writing the description |
| Collect applications | Resumes scattered across email | Every applicant in one list | Same, with resumes parsed into fields |
| Screen resumes | Read everything yourself | Filter by answers and keywords | AI reads each resume and scores fit with reasons |
| Interview | Calendar ping-pong, notes in docs | Scheduling and shared feedback | Plus AI-drafted interview questions per candidate |
| Reply to candidates | Often forgotten | Templates and bulk emails | Drafted replies you approve |
| Decide and offer | Memory and gut feel | Full record per candidate | Plus a summary of strengths and gaps |
ATS vs spreadsheet vs HRIS
A spreadsheet can be an ATS for one or two roles. A Google Form feeding a Sheet with a "stage" column works fine when you have 20 applicants. It breaks when you have several jobs, several reviewers, or more than about 50 resumes, because nobody can see who is waiting on whom.
An HRIS (human resources information system) manages employees after they are hired: personal records, time off, benefits, payroll, performance. Some HRIS products, such as BambooHR, include a built-in ATS. The simple way to remember it: the ATS covers candidates, the HRIS covers employees.
A recruitment CRM is a third category, used mainly by agencies and sourcing teams to nurture candidates over months. Our guide to ATS and AI explains how these pieces fit together.
How AI resume screening works in an ATS
"AI ATS" and "resume screening software" usually mean one of three things:
- Parsing. The oldest form. Software reads a resume and pulls out name, contact details, job titles, dates and skills into fields. Almost every ATS does this.
- Matching and ranking. The system compares each candidate's parsed profile against the job and ranks them. Older systems relied heavily on keyword overlap. Newer ones use language models that understand that "managed a team of six" and "people leadership" are related.
- Reasoned scoring. The newest form. A large language model reads the whole resume against the job, gives a fit score and explains why: "five years of B2B sales, no experience with the CRM you named, strong on the must-have of managing renewals". Some tools also draft interview questions that target each candidate's gaps.
So, can AI screen resumes? Yes, and it saves real time when a role draws dozens or hundreds of applicants. But it should sort and summarize, not decide. AI can undervalue unusual career paths, and it can inherit bias from the job description or past hiring data. A sensible rule: let AI rank and explain, then have a person read the top group and a sample of the rest. Our deep dive on how AI resume screening works covers the details and the risks. Some US jurisdictions also regulate automated hiring tools; this is general information, not legal advice.
In KissMySkills Hiring, the screening is done by your own Claude or ChatGPT through the KissMySkills connector. Applications arrive through a public job page, become candidate cards on a board (Applied, Screen, Interview, Offer), and your AI reads each CV, gives a fit score with the reasons behind it and writes interview questions. People make the decision.
Common ATS features beyond the basics
Once you move past "one list of applicants", ATS products differ mainly in these extras. Knowing the names helps when you read pricing pages:
- Job-board distribution: posting one job to many boards at once. Often the main reason to pay.
- Careers page: a branded page on your site listing open roles, with an application form for each.
- Knockout questions: required answers (work authorization, location, license) that filter applicants automatically. Use them carefully and only for genuine requirements.
- Interview scheduling: candidates pick a slot from your calendar instead of trading emails.
- Scorecards: each interviewer rates the same criteria, so decisions compare like with like.
- Email templates and automation: acknowledgments, rejections and reminders sent on time without you remembering.
- Reporting: time to hire, source of hire, pass-through rates per stage.
- Integrations: calendar, email, background checks, HRIS and payroll.
A small business rarely needs all of these on day one. A form, a pipeline, quick replies and some help reading resumes cover most of the value.
Do you need an ATS? (5-question test)
Answer yes or no:
- Do you have more than one role open at a time, or hire more than four people a year?
- Does a typical job post bring in more than 30 applicants?
- Do two or more people review candidates?
- Have you ever lost track of a good candidate, or forgotten to reply to someone?
- Do you need a record of why each candidate was or was not moved forward?
0 to 1 yes: a form and a spreadsheet are fine for now. 2 to 3 yes: a free or low-cost ATS will save you time. 4 to 5 yes: you need an ATS, and probably AI screening too.
Examples of ATS by company size
These are examples, not recommendations; the right pick depends on your volume and budget.
- Very small businesses (1 to 20 employees): free or light tools. Breezy HR and Zoho Recruit have free plans for one active job. KissMySkills Hiring is free for up to 300 records in AI CRM (candidates count toward this limit), 1 user and unlimited job posts; the All-Access subscription at $15 a month (or $129 a year) removes the record limit. Google Forms plus Sheets works for a single role.
- Small and mid-size businesses (20 to 200): Workable, Breezy HR's paid plans, Manatal, JazzHR, or BambooHR if you want HR and hiring in one system.
- Growth-stage and mid-market (100 to 1,000): Greenhouse, Ashby and Lever, built for structured interviews, analytics and larger hiring teams.
- Enterprise: Workday, iCIMS and similar platforms. They win for compliance-heavy, high-volume hiring across many locations, where audit trails and integrations with large HR systems matter most.
Where our tool does not fit: if you need job-board distribution, structured interview scorecards, compliance reporting or high-volume hiring, choose one of the larger systems above.
For candidates: how to get through an ATS
A large share of people searching "what is ATS" are job seekers. The short version: an ATS is not a robot that rejects you for a missing keyword, but it does need to read your resume correctly, and many employers now use AI to rank applicants.
- Use a simple layout. One column, standard headings (Experience, Education, Skills), no text inside images or complex tables.
- Mirror the job's language honestly. If the posting says "account management" and you did it, use those words.
- Lead with results. "Cut onboarding time from 3 weeks to 10 days" reads well to both AI and humans.
- Send a PDF or Word file unless the employer asks for something else, and answer the screening questions fully.
Our comparison of AI resume builders and what recruiters actually notice goes further.
FAQ
What is ATS in HR?
In HR, ATS stands for applicant tracking system. It is the software HR teams use to post jobs, collect applications, screen and interview candidates, and record hiring decisions. It covers candidates before they are hired; an HRIS covers employees afterward.
What is ATS software?
ATS software is a program, usually web-based, that stores every job applicant in one database and moves them through hiring stages such as applied, screen, interview and offer. Most ATS software also publishes jobs, emails candidates and schedules interviews.
What are ATS systems?
ATS systems are applicant tracking systems: tools employers use to manage hiring. They range from free single-job tools for small businesses to enterprise platforms like Workday and iCIMS that handle thousands of applicants and compliance requirements.
Can AI screen resumes?
Yes. Modern AI can read a resume against a job description, score the fit and explain its reasoning. It saves time on large applicant pools, but a person should review the results and make the final decision, because AI can miss unusual backgrounds or repeat bias.
Summary
An applicant tracking system is the system of record for hiring: one place for every job, applicant and decision. Small businesses can start free, growing teams pay for job-board reach and automation, and AI screening is now common at every size. See an AI ATS in action: create a job in KissMySkills Hiring and screen your first applicants, free to start at crm.kissmyskills.com.
