A free vulnerability scanner is enough when you have a few repositories, one team, no audit evidence requirement and someone who will read the results. It stops being enough when you need scale, prioritisation, history and enforcement. Try a free option first and write down the limits you actually hit.
What free usually gives you
A one off scan of a repository or a container image, a list of known vulnerable packages, and sometimes update suggestions. That is genuinely useful. It answers the first question: what is in here and what is known to be wrong with it?
Where "enough" holds
- One to a few repositories, one language family.
- A team small enough to talk about every finding.
- No customer or regulator asking for continuous evidence.
- A habit of running the scan, whether in CI or on a schedule.
Where it starts to strain
Continuity. A single scan is a snapshot. New advisories land every day, and last month's clean result means little today. If the free tool runs only when someone remembers, coverage decays.
Noise. Without reachability or exploit data, a long list of findings is hard to rank.
History. Showing improvement over time needs stored results.
Enforcement. Blocking a risky merge needs a gate, not just a report.
Breadth. Containers, infrastructure and APIs each need their own checks.
A fair test before you pay
- Run the free tool on your two most important repositories.
- Note how many findings it raises and how many are actionable.
- Set a calendar reminder to rerun it in two weeks.
- Ask whether anyone acted on the results without being nudged.
If the answers are good, keep going and revisit in a quarter. If results were ignored, adding more tooling will not fix a process problem.
Free is not the same as costless
Someone has to run it, read it, update it, and handle false matches. Your engineer's time is a cost. For some teams that cost exceeds a paid tool, and for others it does not. Do the arithmetic honestly.
Try it yourself
Open the continuous monitoring demo and watch how a clean project becomes affected when a new advisory is published. That gap is the main thing a one off scan cannot show.
Click through it at your own pace, or open it full screen.
Where Safeguard fits: the free scan at https://gold.safeguard.sh/scan covers a repository check with no commitment, and the platform adds policies and gates, reachability analysis and continuous monitoring when you outgrow a one off scan.
Quick check
Is a free scan safe to run on private code?
Check what is uploaded and how long it is kept before you scan private code, and use a test repository first if unsure.
How often should I rerun a free scanner?
At least weekly for active projects, and on every pull request if you can automate it.
Last reviewed: 19 October 2026.
