c99.nl — September 2026 traffic, keywords & AI visibility

Search engines send c99.nl an estimated 7,178 visits a month. Effectively all of it is organic — about 7,178 visits from unpaid results. Spread across 264 ranking keywords, that averages roughly 27 organic visits per keyword.

c99.nl scores 59 out of 100 on our AI visibility scale, grade D. It takes full marks for LLMS.txt. The biggest gap is SEO health, at 0 of 20 points (0/100), worth 20 points if closed. It also loses points on Crawlability (0/10), Company profile (19/25) and Structured data (0/5).

The llms.txt on c99.nl runs to 130 lines (7,582 characters) across 12 sections, last generated in August 2026. It introduces the site as "C99 - Straightforward web utilities". It tells AI engines the business works in Software & Internet, Developer Tools and Web Utilities. It describes 3 products, with prices such as JSON Formatter at Free, Base64 Encoder at Free and Data Validator at Free. The audience it names is Developers and IT professionals, aged 18-45 (Europe and growing international). Technologies it mentions include standard web stack. The keywords it claims start with "web utilities", "developer tools", "json formatter" and "base64 encoder".

# C99 - Straightforward web utilities

## About
C99 started as a small side project in the Netherlands and has grown into a reliable provider of online utilities that developers and small teams actually use every day. The company focuses on straightforward web-based tools that solve common tasks without forcing users through complicated sign-ups or bloated interfaces. Over time the team added features based on direct feedback from people who visit the site regularly for quick jobs like encoding, formatting or checking data. Most users come from Europe but traffic has steadily increased from other regions as word spreads through forums and GitHub discussions. The value comes from keeping everything fast, free for basic use and transparent about what the tools do. C99 avoids heavy marketing and instead relies on the quality of the utilities themselves to bring people back. The small team handles everything from maintenance to new feature ideas without outside funding. They keep the site lightweight so it loads quickly even on slower connections. Regular updates fix issues reported by users and add small improvements that make daily work easier. No one at the company pretends to be a massive enterprise platform. Instead they stay focused on the niche of simple, no-nonsense web utilities. This approach has created a loyal base of developers, students and IT professionals who return

Google lists c99.nl for about 264 keywords, which together bring an estimated 7,178 organic visits a month.

The latest technical audit of c99.nl scored 0 out of 100 overall. The audit makes 12 recommendations in all, and 4 of the 4 listed first are rated high priority or critical.

C99's company profile names jsonlint.com, base64encode.org, urlencoder.org and regex101.com as competitors. Its own llms.txt adds cyberchef.org and jsonformatter.org. Outside its market, the domains ranked closest to it in our worldwide ranking are sunrisecasino.org, diary.to, jbservers.net and ute.com.

jsonlint.com

base64encode.org

urlencoder.org

regex101.com

cyberchef.org

jsonformatter.org