What is an applicant tracking system (ATS)? A plain-English guide for employers
On this page
- What does an applicant tracking system do?
- What does an ATS store?
- What hiring records does an ATS keep for compliance?
- How is an ATS different from an HRIS or a CRM?
- What do agency applicant tracking systems add?
- What are some examples of applicant tracking systems?
- Does a small employer need an ATS?
- What are the pros and cons of an ATS?
- How do applicant tracking systems use AI, and what should you watch?
- Related terms
- Questions people ask
An applicant tracking system (ATS) is software that manages job applicants from posting to hire: it publishes job ads, collects applications, keeps a record for each candidate with their resume, stage, interview schedule, feedback and emails, and records the final decision. For an employer it is also the system of record for hiring, which matters because US employers covered by federal anti-discrimination law must keep applications and other hiring records for at least a year. Examples as of October 2026 include Greenhouse, Lever, Workable, Ashby and JazzHR for in-house teams, while agency systems such as Bullhorn, JobAdder and Recruit CRM add clients, job orders and placements.
If you run a recruiting agency and are choosing between systems, see ATS vs CRM for recruiting agencies. This page is the plain definition for hiring managers, small employers and anyone new to recruiting.
What does an applicant tracking system do?
A typical hire moves through the ATS like this:
- Requisition. A manager requests the role, and it is approved, often inside the ATS; see what is a requisition number.
- Posting. The job is published to the careers page and sent to job boards.
- Applications. Candidates apply; the ATS parses resumes into fields and asks any screening questions.
- Review and screening. Recruiters move candidates through stages, with notes at each.
- Interviews. The ATS schedules interviews, sends interview kits and collects scorecards.
- Decision and offer. Offers are approved and sent; rejected candidates get a reason code and, ideally, a message.
- Handoff. The hired candidate's record passes to the HR system for onboarding and payroll.
What does an ATS store?
| Record | Typical contents | Why it matters |
|---|---|---|
| Job | Title, description, location, pay range, hiring team, requisition number | Postings must match the approved role and, in many states, show a pay range |
| Candidate | Contact details, resume, source, consent, communications | Personal data, covered by privacy laws in many places |
| Application | Answers to screening questions, stage history with dates | Shows who was considered, when and how far they got |
| Evaluation | Interview notes, scorecards, assessments | The evidence behind each decision; see how to write candidate notes in your ATS |
| Disposition | Why a candidate was rejected or withdrew | The basis for adverse impact checks and answering complaints |
| Self-identification | Voluntary sex, race or ethnicity, veteran and disability data | Used for reporting, and normally kept apart from the people making decisions |
What hiring records does an ATS keep for compliance?
The ATS is usually where an employer meets its record-keeping duties, whether or not anyone planned it that way. As of October 2026, in the US:
- One year for hiring records. Employers covered by Title VII, the ADA and GINA must keep application forms and other records having to do with hiring for one year from the record or the personnel action, whichever is later, and keep everything relevant once a discrimination charge is filed (29 CFR 1602.14).
- One year under the age discrimination rules for applications and resumes, records of refusals to hire, job orders sent to employment agencies and job advertisements (29 CFR 1627.3(b)(1)).
- Longer in some states. California requires four years for data that automated-decision systems produce or use; see how long to keep interview notes for the state list.
- Federal contractors covered by VEVRAA still count applicants and hires each year; the applicant flow log template shows how.
- Privacy limits. The GDPR in the EU and UK, and the CCPA for covered California businesses, limit how long candidate data may be kept and give candidates rights to see and delete it; see CCPA and job applicant data and the candidate data retention policy template.
An ATS only helps if it is used consistently: every applicant in it, every rejection with a reason, notes written in the system rather than in personal email. This is general information, not legal advice.
How is an ATS different from an HRIS or a CRM?
| ATS | Recruitment CRM | HRIS | |
|---|---|---|---|
| Who is in it | People applying for open jobs | People you might hire one day, and in agencies, clients | Employees |
| Main job | Run each hiring process and record decisions | Build relationships before a role exists | Employee records, payroll, benefits, time off |
| Starts | When someone applies or is added to a job | When you first find or meet someone | At offer acceptance or start date |
| Typical outputs | Pipelines, scorecards, offers | Talent pools, nurture emails | Payslips, headcount reports |
The categories overlap more every year. Lever says it "combines ATS and CRM capabilities", Ashby says its software "consolidates your ATS, Analytics, Scheduling, and CRM", and Workable now calls itself "your system of record for everything HR" (each from the vendor's own site, as of October 2026). The labels matter less than knowing which system holds the official record of each hiring decision.
What do agency applicant tracking systems add?
A staffing or recruiting agency hires for clients, so its system has to track more than candidates:
- Clients and contacts, with business development history.
- Job orders from each client, with fees, terms and exclusivity; see the job order form template.
- Submittals: which candidate went to which client, when, with the candidate's consent, which is what settles candidate ownership disputes.
- Placements with start dates, fees, guarantee periods and invoices.
- Contractors: timesheets, pay and bill rates, and assignment end dates.
Vendors describe themselves accordingly. Bullhorn calls its product a "recruiting CRM" for agencies, JobAdder sells "ATS and CRM recruitment software", and Recruit CRM lists "ATS + CRM, AI agents, automation, outreach, and timesheets" for recruitment firms (bullhorn.com, jobadder.com, recruitcrm.io, as of October 2026).
What are some examples of applicant tracking systems?
| Product | How it describes itself (own site, October 2026) | Built mainly for |
|---|---|---|
| Greenhouse | "More than a hiring platform or ATS"; a hiring ecosystem bringing employers and job seekers together | In-house recruiting teams |
| Lever | Recruiting software combining ATS and CRM for scaling teams | In-house recruiting teams |
| Ashby | All-in-one recruiting software: ATS, analytics, scheduling and CRM | In-house recruiting teams |
| Workable | HR software and system of record to find, hire and manage talent | Small and mid-size employers |
| JazzHR | Recruiting software for small to medium-sized businesses | Small businesses |
| Bullhorn, JobAdder, Recruit CRM | Recruiting CRM, or ATS plus CRM, for agencies | Recruiting and staffing agencies |
Many HR suites, such as BambooHR, include hiring features alongside employee records. This is a list of examples, not a ranking; for a structured comparison, start from the ATS RFP template.
Does a small employer need an ATS?
Not necessarily. A business making a few hires a year can run a fair, well-documented process with a shared inbox, a spreadsheet and a written scorecard; structured interviews without an ATS shows how. An ATS starts to earn its cost when:
- several roles are open at once, or applications arrive faster than one person can track;
- several people interview and their feedback ends up scattered across email and chat;
- candidates fall through the cracks and never hear back;
- you need reliable records for audits, complaints or reporting.
What are the pros and cons of an ATS?
| Pros | Cons |
|---|---|
| One place for every candidate, note and decision | Only as good as the data people put in |
| Consistent stages, scorecards and messages | Configuration takes time; defaults rarely fit |
| Records ready for audits and complaints | Switching systems later is a project; see the ATS migration checklist |
| Reporting on time to fill, sources and conversion | Automated filters and AI ranking can reject people unfairly if set up carelessly |
How do applicant tracking systems use AI, and what should you watch?
Common AI features include resume parsing, matching or ranking applicants against a job, drafting job ads and messages, and summarizing interviews. Ranking is the one to treat with care: it is a selection procedure, and in New York City a tool that substantially assists hiring decisions can require an annual bias audit and candidate notices; see the Local Law 144 bias audit. Ranking can also be gamed by text hidden in resumes; see resume prompt injection.
Interview notes reach the ATS either through an integration or by pasting. Interview Signal, which we make, has no ATS integration: it shapes notes for Bullhorn, Greenhouse, Lever or JobAdder for the recruiter to paste by hand. How to get AI interview notes into an ATS without an integration covers that workflow for any tool.
Related terms
- Recruitment CRM: software for relationships with future candidates and, in agencies, clients.
- HRIS: the employee system that takes over at hire.
- Disposition reason: the coded reason a candidate left the process.
- Knockout question: a screening question that automatically rejects applicants who do not meet a stated requirement.
- Recruiting operations: the function that usually runs the ATS; see what is recruiting operations.
Questions people ask
What is an ATS in hiring?
An ATS, or applicant tracking system, is software that publishes job postings, collects applications and keeps a record for each candidate as they move through the hiring process: their resume, contact details, stage, interview schedule, feedback, emails and the final decision. It is the hiring team's shared workspace and the employer's record of how each hiring decision was made.
What is the difference between an ATS and an HRIS?
An ATS manages people who are applying for jobs, up to the point of hire. An HRIS manages people who work for you: employee records, payroll, benefits and time off. Many HR suites include both, and the usual handoff is that a candidate's record moves from the ATS to the HRIS when an offer is accepted.
Does a small business need an applicant tracking system?
Not always. A business hiring a few people a year can run a fair process with a shared inbox, a spreadsheet and a written scorecard, as long as it keeps applications and notes for the required period. An ATS starts to pay for itself when several roles are open at once, several people interview, or applications arrive faster than one person can track by email.
Do applicant tracking systems reject resumes automatically?
Only if someone sets them up to. Knockout questions configured by the employer, such as requiring a license, can reject applicants automatically, and some systems rank or score applications with AI. Both are selection procedures the employer is responsible for, and automated ranking can trigger rules such as New York City's bias-audit law.