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Cybersecurity · head to head

Semgrep vs Userscripts

Semgrep logo

Semgrep

Cybersecurity

Open-source static analysis tool for finding security bugs and enforcing code standards.

From
Free
Rated
-
Full reviewWebsite
Userscripts logo

Userscripts

Browser Extensions

Open-source userscript manager for Safari on Mac and iOS

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Semgrep free tier caps out at 10 contributors and 10 repositories.; Userscripts safari cannot let extensions bypass a site's Content Security Policy, so strict sites produce "Refused to execute a script" errors that the @inject-into workaround does not always fix.
  • They diverge on capability: Semgrep covers Static code scanning, Userscripts covers Built-in script editor.
  • Prices and features above were last checked on 17 September 2026.

Where they differ

Only the attributes on which Semgrep and Userscripts actually diverge.

Attributes where Semgrep and Userscripts differ
AttributeSemgrepUserscripts
Pricing modelfreemiumopen-source
Platformsweb, api, linux, mac, windowsSafari, macOS, iOS
CategoryCybersecurityBrowser Extensions

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Semgrep

  • Static code scanning
  • Supply chain scanning
  • Secrets detection
  • Cross-file analysis
  • AI-powered triage and remediation
  • CI/CD integration

Only in Userscripts

  • Built-in script editor
  • Standard metadata support
  • GM API
  • Remote script updating
  • iCloud sync
  • Per-page popup

What people use each for

The jobs each tool is most often brought in to do.

Semgrep

  • Scanning code for security vulnerabilities in CI/CDnot Userscripts
  • Detecting vulnerable open-source dependenciesnot Userscripts
  • Finding hardcoded secrets before code shipsnot Userscripts
  • Enforcing custom code standards with rule setsnot Userscripts
  • Prioritizing findings with AI-assisted triagenot Userscripts

Userscripts

  • Running userscripts on Safari without paying for Tampermonkeynot Semgrep
  • Running userscripts on an iPhone or iPadnot Semgrep
  • Writing scripts on a Mac and syncing them to iOSnot Semgrep
  • Blocking or restyling site elements Safari content blockers cannot reachnot Semgrep
  • Keeping a script library under an open-source licencenot Semgrep

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Semgrep

  • Free tier caps out at 10 contributors and 10 repositories.
  • Secrets scanning is priced as a separate module ($15/contributor) from Code and Supply Chain.
  • Self-managed repositories and custom CI/CD require the Enterprise tier.
  • AI credits are limited per tier and additional usage requires upgrading.

Userscripts

  • Safari cannot let extensions bypass a site's Content Security Policy, so strict sites produce "Refused to execute a script" errors that the @inject-into workaround does not always fix.
  • Apple only. There is no Chrome, Firefox or Edge build, so it cannot be a cross-browser answer.
  • iCloud sync is documented as having delays, which is awkward when editing the same script on two devices.
  • Requires macOS 12 and Safari 14.1, or iOS 15.1, so older Apple hardware is excluded.
  • GPL v3 means a commercial licence is required for non-open-source use, which matters if you are embedding rather than just using it.

Pricing, plan by plan

Semgrep

Free
  • FreeFree
    • Up to 10 contributors
    • Code and Supply Chain scanning
    • 60 AI credits total
  • Teams$30/month
    • Code, Supply Chain, or Secrets scanning per contributor
    • Pro rules
    • AI-powered triage and remediation
  • Enterprise$undefined/month
    • On-prem support
    • Custom CI/CD
    • 50 AI credits per developer/month

Userscripts

Free
  • FreeFree
    • Full functionality
    • GPL v3 licensed
    • macOS, iOS and iPadOS

Which should you pick?

Choose Semgrep if

  • You need static code scanning.
  • You want to start without paying.
  • You work on web, api, linux, mac, windows.
  • You also want supply chain scanning.
Semgrep review

Choose Userscripts if

  • You need built-in script editor.
  • You want to start without paying.
  • You work on Safari, macOS, iOS.
  • You also want standard metadata support.
Userscripts review

Questions people ask

Is Semgrep or Userscripts better?
Neither clearly leads. Semgrep starts at Free and Userscripts at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Semgrep or Userscripts?
Semgrep starts at Free and Userscripts at Free.
Does Semgrep or Userscripts run on more platforms?
Semgrep runs on web, api, linux, mac, windows. Userscripts runs on Safari, macOS, iOS.
Can I use Semgrep for free?
Both have a free tier, so you can try either at no cost before committing.
What is Semgrep best used for?
Semgrep is most often used for scanning code for security vulnerabilities in ci/cd, detecting vulnerable open-source dependencies, finding hardcoded secrets before code ships, enforcing custom code standards with rule sets. Of those, scanning code for security vulnerabilities in ci/cd and detecting vulnerable open-source dependencies are not what Userscripts is typically brought in for.
What can Semgrep do that Userscripts cannot?
Semgrep covers Static code scanning, Supply chain scanning, Secrets detection, Cross-file analysis. Userscripts covers Built-in script editor, Standard metadata support, GM API, Remote script updating.

Answered from the vendors’ own pages

Semgrep: What does Semgrep cost?

The Free edition covers up to 10 contributors; Teams starts at $30/contributor/month for Code scanning (Supply Chain also $30, Secrets $15); Enterprise is custom-priced.

Source
Userscripts: Is Userscripts for Safari free?

Yes, free on the App Store and licensed under GPL v3. A commercial licence is required for use in something that is not itself open source.

Source
Semgrep: Is there a free plan, and what are its limits?

Yes, the Free edition supports up to 10 contributors and 10 repositories with Code and Supply Chain scanning plus 60 AI credits total.

Source
Userscripts: Does it work on iPhone?

Yes, on iOS and iPadOS 15.1 or later, which makes it one of the few ways to run userscripts on an iPhone.

Source
Semgrep: How is usage metered?

Pricing is per contributor, defined as someone who made at least one commit to a scanned private repository in the past 90 days.

Source
Userscripts: Why do I get "Refused to execute a script" errors?

Safari does not let extensions bypass a site's Content Security Policy the way other browsers do. The documented workaround is changing the script's @inject-into setting, though it does not resolve every case.

Source
Semgrep: Is there special pricing for startups?

Yes, Semgrep offers special startup pricing upon request for early-stage companies.

Source
Userscripts: Do my scripts sync between Mac and iPhone?

Yes, over iCloud, though the project notes the sync can be delayed rather than immediate.

Source
Userscripts: What are the system requirements?

macOS 12 or later with Safari 14.1 or later, or iOS and iPadOS 15.1 or later.

Source
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