Key takeaway: An applicant tracking system (ATS) is the software a company uses to post jobs, receive applications, store candidate records and move each candidate through the stages of a hiring process (applied, screened, interviewing, offer, hired). It is the system of record for recruiting, in the way a CRM is the system of record for sales. Common examples are Greenhouse, Lever, Ashby, Workday Recruiting, iCIMS and Bullhorn.
Almost every company with more than a few dozen employees runs one. The ATS is where compliance data lives, where interview feedback is collected, and what every other recruiting tool integrates with.
What does an ATS actually do?
- Job posting and distribution. Publishes openings to the careers page and job boards.
- Application intake. Collects résumés and application answers, parses them into structured records.
- Pipeline tracking. Shows every candidate's stage per role and who owns the next step.
- Interview coordination. Schedules (or integrates with a scheduler), collects scorecards and feedback.
- Communication log. Stores emails and notes so the history is visible to the whole team.
- Reporting and compliance. Time-to-fill, source-of-hire, pipeline conversion, and the records needed for EEO/OFCCP or GDPR obligations.
What does an ATS not do?
This is where most confusion sits. A traditional ATS is passive: it manages the candidates who come to you. It does not, on its own:
- find candidates who have not applied (that is sourcing, done by recruiters or sourcing tools);
- contact passive candidates (outreach tools or recruiters do that);
- judge candidate quality beyond keyword filters (see AI résumé screening);
- make the old candidates in your database useful without someone searching them.
The last point is a recurring frustration: companies accumulate tens of thousands of past applicants in the ATS and almost never look at them again, because the built-in search is keyword-based and the data is stale.
ATS vs CRM vs sourcing tool
| System | Manages | Candidates come from | Example |
|---|---|---|---|
| ATS | Active applicants through stages | Applications | Greenhouse, Lever, Workday |
| Recruiting CRM | Relationships with people not yet in a process | Events, sourcing, past applicants | Gem, Beamery |
| Sourcing / AI recruiter | Finding and contacting new candidates | Web, professional networks, your ATS | Noon, LinkedIn Recruiter |
Many modern products blur these lines; the ATS remains the one every company needs first.
How is an ATS priced?
Usually per employee (for enterprise HR suites) or per recruiter seat plus a platform fee (for standalone recruiting ATSs), billed annually. See how recruiting software is priced for the full set of models.
Where Noon fits
Noon is not an ATS and does not replace one. It connects to more than 20 ATS providers so that candidates Noon sources and screens land in the existing pipeline, and its ATS Search re-ranks the candidates already sitting in your database against new roles. Noon then handles the finding and the email and SMS outreach that an ATS does not do. One unlimited plan; see pricing.
Frequently asked questions
Do small companies need an ATS?
Once you are hiring for more than two or three roles at a time, yes. Below that, a spreadsheet works until compliance, scheduling or a second recruiter makes it painful.
Is LinkedIn Recruiter an ATS?
No. LinkedIn Recruiter is a sourcing and messaging tool for finding candidates on LinkedIn. Most companies use it alongside an ATS, not instead of one.
What is ATS-friendly résumé formatting?
Résumés the parser can read: standard headings, no tables or text boxes, common fonts, dates in a consistent format. Modern parsers handle most layouts; the advice matters more for older systems.
Can an ATS reject candidates automatically?
Yes, through knock-out questions on the application (for example work authorization). Automatic rejection on résumé keywords is possible but widely discouraged because it discards qualified candidates who used different words.