- LetMeCheck is best for: people who built an app with an AI tool, are not developers, and want to know from a URL whether it is safe, with a fix prompt for each issue.
- Semgrep is best for: developers and security teams who want to write and run their own code-scanning rules, in the terminal and in CI, with an open-source engine.
At a glance
What Semgrep is
Semgrep is a code security platform. Its engine finds security problems in source code by matching patterns, and developers can write their own rules. The platform adds dependency scanning, secrets scanning and malware protection.
The Semgrep Community Edition is open source under the LGPL 2.1 licence and supports 30+ programming languages. You run it from the command line or in CI. According to Semgrep’s own repository, it analyses within a single function or file, and the paid platform adds cross-file analysis.
It is popular with developers who want control: you can read the rules, change them and run them anywhere.
What LetMeCheck is
LetMeCheck is a hosted security check for apps built with AI tools. You paste a website address and read the result in about a minute. Nothing is installed and nothing on your site is changed.
For a deeper look, connect GitHub with read-only access and choose the repositories. The full check reads the code for exposed secret keys (including ones deleted since but still in the history), who can read and change each database table, packages with known holes and pages that skip the login check.
Issues come with a rating and a fix prompt for your AI tool. LetMeCheck helps you find and fix problems. It does not promise an app is secure.
Key differences
Who it is made for
Semgrep assumes you can run a command, read a rule and work in a terminal or CI. That is a feature for developers who want to tune the scanner.
LetMeCheck assumes you would rather not. You get a result from a URL and an explanation in words, not in rules.
Control versus convenience
Semgrep gives you control. You can write custom rules, run the engine on your own machine and see how it works.
LetMeCheck gives you convenience. The checks are chosen for you and hosted for you. If you want to write your own rules, Semgrep is the better fit.
What gets looked at
Semgrep scans source code, dependencies and secrets. LetMeCheck looks at the live site from outside, and with GitHub connected at secret keys, packages and login checks in your code.
LetMeCheck’s full check also looks at database rules, meaning who can read and change each table. We did not find a database access rule check on the Semgrep pages we read (as of November 2026), so ask Semgrep if you need one.
Free versus paid depth
The Semgrep Community Edition is free and open source, but Semgrep says it does not include Supply Chain scanning, secrets scanning, dashboards or managed scans, and it analyses within a single function or file. The platform adds those.
LetMeCheck’s quick check is free and unlimited, and the Free plan includes a full report for 1 app. Full GitHub checks start on the paid plans.
How the pricing works
Semgrep prices by contributor: anyone who committed to a scanned private repository in the last 90 days. As of November 2026 the Free Edition covers up to 10 contributors, and Teams starts from $30 a month per contributor for Code.
LetMeCheck prices by the number of apps you want full checks for, not by who wrote the code. See pricing.
Where Semgrep is the better choice
- You are a developer and want to write, read and change scanning rules.
- You want an open-source engine you can run anywhere.
- You work in many languages: Semgrep’s Community Edition supports 30+.
- You want scanning in CI and pull requests across GitHub, GitLab, Bitbucket and Azure.
- You need cross-file analysis, dashboards or enterprise controls from the platform.
Where LetMeCheck is the better choice
- You are not a developer and want plain-English results.
- You want an answer from a URL, with nothing to install.
- You want fix prompts written for your AI tool.
- Your worry is exposed keys, open database tables and pages with no login check.
- You may want a vetted developer to do the fixes, with a fixed quote and a re-check.
Can you use both?
Yes. A developer can run Semgrep in CI for source-level rules, and a founder can run the LetMeCheck quick check on the live site for what a stranger sees.
If both point to the same file or issue, start there.
Which should you pick?
- You are a developer who wants custom rules.
- You want an open-source engine.
- You need CI and pull request checks.
- You work across many languages.
- You built with an AI tool and are not a developer.
- You want to start from a URL with nothing to install.
- You want plain English and fix prompts.
- You want database access and key checks first.
Frequently asked questions
Is Semgrep free?
Part of it is. The Community Edition is open source under the LGPL 2.1 licence. The Free Edition of the platform is $0 for up to 10 contributors, and paid Teams plans start from $30 a month per contributor for Code, as of November 2026. LetMeCheck’s quick check is free and unlimited.
Is LetMeCheck a Semgrep alternative?
For people who built an app with an AI tool and are not developers, yes, because it needs only a URL and explains results in plain English. For developers who want custom rules and an open-source engine, Semgrep is the better fit.
Does Semgrep check a live website from a URL?
Semgrep’s pages describe scanning code, dependencies and secrets. We did not find a feature that checks a deployed site from only its URL (as of November 2026). LetMeCheck’s quick check does that, with no sign-up.
Do I need CI to use Semgrep?
No, you can run it from the command line or an editor plugin. Many teams add it to CI. LetMeCheck needs neither: paste a URL for the quick check.
Does LetMeCheck check database access rules?
Yes, in the full check. It looks at who can read and change each database table, because open database rules can leave customer data exposed. We did not find that check on the Semgrep pages we read.
Can I use both?
Yes. They answer different questions. Semgrep checks source code against rules, and LetMeCheck checks what a stranger can see and the problems common in AI-built apps.
See what a check finds on your app
Run the quick check on your live site in about a minute, with no sign-up. Connect GitHub (read-only) when you want the full check.
More comparisons
Last verified:
Competitor details come from their own websites and docs and can change. Spot something out of date? Tell us.
- semgrep.dev/ (checked 2026-11-03)
- semgrep.dev/products/community-edition/ (checked 2026-11-03)
- github.com/semgrep/semgrep (checked 2026-11-03)
- semgrep.dev/pricing (checked 2026-11-03)