Free DeepSource alternatives: 5 apps ranked by verified data

Facts checked Nov 8, 2026AppBreakup editorialHow we rank

5 of the 7 DeepSource alternatives we track can be used for free (free, open source, or with a free plan). SonarQube, Semgrep and Snyk rank highest, with facts last verified Nov 8, 2026.

DeepSource has been acquired. DeepSource has joined Harness, according to a notice on the DeepSource website.

Quick comparison

#	App	Pricing	Verified price	Open source	Platforms	Verified facts	Score
1	SonarQube	Free plan + paid	$34/month (Team plan, up to 100k LOC)	Yes	Web, Self-hosted	4 of 4	83.8
2	Semgrep	Free plan + paid	$30 per contributor/month (Teams)	Yes	Web, Windows, macOS +1	5 of 5	64.8
3	Snyk	Free plan + paid	$25 a month, billed monthly (Team)	No	Web, Windows, macOS +1	4 of 4	61.8
4	CodeQL	Free plan + paid	—	No	Windows, macOS, Linux	5 of 5	59.4
5	Aikido Security	Free plan + paid	$4,000 per assessment (typical)	No	Web	6 of 6	57.5

1. SonarQubeTop pick
Best for: Teams that want quality gates for code quality and security on every pull request
Free plan + paidOpen sourceSelf-hostableWeb, Self-hosted
83.8
score / 100
Why switch from DeepSource
Long-established code quality and security analysis with a self-managed edition and broad language support.
Pros
Combines code quality and security in one report
Choice of cloud service or self-hosted server
Free IDE extension for instant feedback
Free for public open-source projects
Cons
Pricing scales with lines of code, which gets costly for large codebases
Free private tier is limited to 50k lines of code
Advanced security features are kept for higher tiers
Visit SonarQube Details and reviews
How this score is calculated
Editorial fit ×0.3100
Reviews ×0.363
Clicks (90 days) ×0.15100
Freshness ×0.15100
Votes ×0.150
0 counted reviews, 0 up and 0 down votes. Full formula
Is SonarQube a good DeepSource alternative?
Verified facts
4 of 4 verified
Free plan
Private projects up to 50k LOC
Checked Nov 8, 2026sonarsource.com(opens source in a new tab)
Starting price
$34/month (Team plan, up to 100k LOC)
Checked Nov 8, 2026sonarsource.com(opens source in a new tab)
Free trial
14 days (Team plan)
Checked Nov 8, 2026sonarsource.com(opens source in a new tab)
License
LGPL-3.0
Checked Oct 30, 2026github.com(opens source in a new tab)
2. Semgrep
Best for: Teams that want fast CI scans and easy-to-write custom rules
Free plan + paidOpen sourceWeb, Windows, macOS, Linux
64.8
score / 100
Why switch from DeepSource
Fast open-source static analysis with easy custom rules, plus supply chain and secrets scanning in its platform.
Pros
Rules are written in code-like patterns that are easy to read
Open-source CLI runs anywhere, including locally
Free edition covers small teams on the hosted platform
SAST, dependency and secrets scanning in one product
Cons
Cross-file analysis and Pro rules need the commercial engine
Free edition is capped at 10 contributors
Paid products are billed separately per contributor
Visit Semgrep Details and reviews
How this score is calculated
Editorial fit ×0.387
Reviews ×0.363
Clicks (90 days) ×0.150
Freshness ×0.15100
Votes ×0.150
0 counted reviews, 0 up and 0 down votes. Full formula
Is Semgrep a good DeepSource alternative?
Verified facts
5 of 5 verified
Free plan
Yes, up to 10 contributors
Checked Nov 8, 2026semgrep.dev(opens source in a new tab)
Starting price
$30 per contributor/month (Teams)
Checked Nov 8, 2026semgrep.dev(opens source in a new tab)
License
LGPL-2.1
Checked Nov 1, 2026github.com(opens source in a new tab)
Languages
35+
Checked Nov 8, 2026semgrep.dev(opens source in a new tab)
Secrets add-on
$15 per contributor/month
Checked Nov 8, 2026semgrep.dev(opens source in a new tab)
3. Snyk
Best for: Development teams that want dependency, code and container scanning in one place
Free plan + paidWeb, Windows, macOS, Linux
61.8
score / 100
Why switch from DeepSource
Developer security platform covering code, dependencies, containers and IaC, with deep IDE and repo integrations.
Pros
Covers dependencies, code, containers and IaC together
Works in the IDE, CLI, pull requests and CI
Free plan includes every scanner
Cons
Free plan has tight monthly test limits, such as 100 code tests
Team plan caps at 10 developers before enterprise pricing
Hosted service only, no self-managed edition on standard plans
Visit Snyk Details and reviews
How this score is calculated
Editorial fit ×0.377
Reviews ×0.363
Clicks (90 days) ×0.150
Freshness ×0.15100
Votes ×0.150
0 counted reviews, 0 up and 0 down votes. Full formula
Is Snyk a good DeepSource alternative?
Verified facts
4 of 4 verified
Free plan
Yes, $0 a month
Checked Nov 8, 2026snyk.io(opens source in a new tab)
Starting price
$25 a month, billed monthly (Team)
Checked Nov 8, 2026snyk.io(opens source in a new tab)
Free code test limit
100 tests/month
Checked Nov 8, 2026snyk.io(opens source in a new tab)
Integrations
IDE, CLI, source code managers
Checked Nov 8, 2026snyk.io(opens source in a new tab)
4. CodeQL
Best for: Teams on GitHub and security researchers who want deep, query-based vulnerability hunting
Free plan + paidWindows, macOS, Linux
59.4
score / 100
Why switch from DeepSource
GitHub's semantic code analysis engine, free for public repositories and built into GitHub code scanning.
Pros
Deep data-flow and taint analysis across a whole codebase
Custom queries let you find every variant of a known bug
Built into GitHub code scanning with alerts on pull requests
Free for public repositories and research
Cons
Private, commercial use requires a paid GitHub Code Security licence
QL query language takes real effort to learn
Compiled languages need a working build to create the database
Visit CodeQL Details and reviews
How this score is calculated
Editorial fit ×0.369
Reviews ×0.363
Clicks (90 days) ×0.150
Freshness ×0.15100
Votes ×0.150
0 counted reviews, 0 up and 0 down votes. Full formula
Is CodeQL a good DeepSource alternative?
Verified facts
5 of 5 verified
Free for open source
Yes, and for research
Checked Nov 8, 2026codeql.github.com(opens source in a new tab)
Query library license
MIT
Checked Oct 29, 2026github.com(opens source in a new tab)
Private repositories
Requires GitHub Code Security
Checked Nov 8, 2026docs.github.com(opens source in a new tab)
Languages
Includes Java, Kotlin, Python, Rust, Swift, TypeScript
Checked Nov 8, 2026codeql.github.com(opens source in a new tab)
VS Code extension
Yes
Checked Nov 8, 2026codeql.github.com(opens source in a new tab)
5. Aikido Security
Best for: Startups and mid-size teams that want one affordable AppSec tool instead of five scanners
Free plan + paidWeb
57.5
score / 100
Why switch from DeepSource
All-in-one AppSec for small teams, bundling SAST, dependency, secrets and cloud scanning with a free tier.
Pros
One dashboard for SCA, SAST, secrets, IaC, containers and cloud
Free-forever plan for up to two users
Auto-triage cuts false positives before they reach developers
On-prem scanning option keeps source code local
Cons
Free plan leaves out AutoFix, AutoTriage and code quality checks
Breadth means individual scanners may be shallower than specialist tools
Pentests and AI SAST are credit-based or quoted separately
Visit Aikido Security Details and reviews
How this score is calculated
Editorial fit ×0.363
Reviews ×0.363
Clicks (90 days) ×0.150
Freshness ×0.15100
Votes ×0.150
0 counted reviews, 0 up and 0 down votes. Full formula
Is Aikido Security a good DeepSource alternative?
Verified facts
6 of 6 verified
Free plan
Yes, up to 2 users
Checked Nov 8, 2026aikido.dev(opens source in a new tab)
On-prem scanning
Yes (paid plans)
Checked Nov 8, 2026aikido.dev(opens source in a new tab)
Founded
2022
Checked Nov 8, 2026aikido.dev(opens source in a new tab)
Headquarters
Ghent, Belgium
Checked Nov 8, 2026aikido.dev(opens source in a new tab)
Compliance
SOC 2, ISO 27001
Checked Nov 8, 2026aikido.dev(opens source in a new tab)
Pentest price
$4,000 per assessment (typical)
Checked Nov 8, 2026aikido.dev(opens source in a new tab)

Quick comparison

1. SonarQubeTop pick

Pros

Cons

Verified facts

2. Semgrep

Pros

Cons

Verified facts

3. Snyk

Pros

Cons

Verified facts

4. CodeQL

Pros

Cons

Verified facts

5. Aikido Security

Pros

Cons

Verified facts