Username Availability Checker — Search 20+ Platforms Instantly
Check if your desired username is available across 20+ platforms including YouTube, Instagram, GitHub and more — all at once. GitHub is verified via live API; others open directly for manual check. 100% free, no server costs.
Username Availability Checker
41 PlatformsCheck 40+ platforms instantly — social, gaming, dev, Korean & more
ℹ️ GitHub is checked via API (exact result). Others: click the link to verify.
Platform Categories We Check
Popularity-weighted coverage across 6 categories
How to read the Username Availability Checker — Search 20+ Platforms Instantly result
Username Availability Checker — Search 20+ Platforms Instantly is most useful when it is treated as a quick decision aid, not as a standalone answer. Enter clean inputs, compare the result with a related tool, and keep the final decision tied to the real context behind the numbers or text.
Check the input first
A small typo, wrong unit, or missing condition can change the Username Availability Checker — Search 20+ Platforms Instantly output. Recheck the input before copying, saving, or sharing the result.
Compare one related signal
Use another MillionsCode tool or hub to confirm the same decision from a different angle. This reduces mistakes when the result affects money, health, publishing, or planning.
Keep the result reusable
If the result is something you will revisit, copy it into your notes with the date and the assumption you used. A saved result without its assumption is easy to misread later.
Use guides for edge cases
When the result feels close to a limit, read the related guide before acting. Calculators and browser tools are fast, but rules, fees, policies, and personal conditions can change the final answer.
Before you act on the result
Use this short checklist before treating the Username Availability Checker — Search 20+ Platforms Instantly result as final. It helps separate a quick browser calculation from a real decision that may affect money, publishing, travel, health, study, or work.
Is the result sensitive to one input?
If one value can change the answer heavily, run the tool twice with a conservative and an optimistic assumption. The difference between those two results is often more useful than a single exact number.
Does the result need a date?
Many decisions depend on the date of the calculation. Exchange rates, search demand, platform rules, fees, and personal conditions move over time, so save the date with the result when you plan to reuse it.
Can another tool confirm it?
When the result leads to a real action, open one related tool or guide and check whether the same direction still makes sense. This is especially important for finance, SEO, crypto, tax, health, and publishing decisions.
Is there a policy or local rule behind it?
A browser tool cannot know every local rule, bank condition, platform limit, or personal exception. If the result is close to a threshold, read the related guide before making the final call.
A practical next step
After using Username Availability Checker — Search 20+ Platforms Instantly, write down the input, the output, and the action you are considering. If the action still looks useful after a second check, move to the related hub or guide and compare the broader context before you commit.
Frequently Asked Questions
Q. Does it automatically check all platforms?
GitHub is verified in real time via its public API. Other platforms (Instagram, X, YouTube, etc.) cannot be directly queried from the browser due to CORS security policies, so we provide direct profile links that open in one click for manual verification.
Q. Do special character rules differ by platform?
Yes. Most platforms allow letters, numbers, underscores (_), and hyphens (-). Instagram also allows dots (.) but not at the start or end. X (Twitter) only allows underscores. The safest username uses only letters, numbers, and underscores.
Q. How is the uniqueness score calculated?
It's scored 0–100 based on length, special characters, starting character, and other factors. Higher scores mean better cross-platform availability. Short usernames (5 chars or fewer) score lower because they're almost always already taken.
Q. Can I get suggestions if my username is taken?
The current version searches your exact input. If taken, try adding numbers or a year (johndoe2025), an underscore (johndoe_), reversing the name (doejohn), or using initials. Short, memorable variations work best.
Q. Can I save or share my results?
Yes. The "Copy All URLs" button copies all 20 platform links to your clipboard at once. The "Share Result" button generates a URL pre-filled with your username for sharing via KakaoTalk or social media.
Q. Do you support Korean platforms?
Yes — Naver Blog, KakaoStory, Tistory, AfreecaTV, and Velog are included, covering 5 major Korean platforms alongside 15 global ones, displayed in separate sections.
How to Use
Type your desired username. Letters, numbers, and underscores work best across all platforms.
GitHub is checked automatically via API. All other platforms generate direct profile links.
Check each platform card status and click the link icon to verify directly on that platform.
Use "Copy All URLs" to save or the share button to send results via KakaoTalk or social media.
Expert Knowledge: Username Availability Checker — Search 20+ Platforms Instantly
Your SNS handle is the foundation of your personal brand. Using the same username across YouTube, Instagram, X (Twitter), and other major platforms creates a "handle SEO" effect — when someone searches your name on Google, each platform profile appears in the top results, dramatically increasing your digital visibility.
The Sherlock Project (80K+ GitHub stars) is a Python CLI that searches 300+ sites for username availability. This web tool accounts for browser CORS restrictions by combining a real-time GitHub API check with direct profile links for 20 major platforms. Everything runs 100% client-side — no server costs, no data sent externally, and results appear instantly.
Username selection tips: 6–15 characters are easiest to remember and most compatible across platforms. Usernames similar to celebrities or trademarks risk being suspended under platform policies. For long-term personal branding, choose a short, pronounceable English combination — ideally one that's available across all major platforms simultaneously.
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