whichtld
🧭 TLD chooser · 2026

IO Domain Alternatives

The best alternative to an .io domain depends on why you chose .io in the first place. If the appeal was developer credibility, .dev offers the same signal with built-in HTTPS enforcement and no sovereignty uncertainty. If it was startup recognition, a creative .com eliminates the renewal escalation .io holders face. The TLD chooser matches your priorities.

IO Domain Alternatives

Four questions
1  What are you putting on it?
2  Does the renewal price matter?
3  Who is going to read it?
4  How long must the name survive?

No prices anywhere in this tool. Registry and registrar pricing moves and differs at every seller, so the picker ranks extensions on things that do not change week to week — and the cost question is handled by the renewal calculator, where you type in the two numbers from your own checkout.

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        The whole shortlist, ranked on your answers

        Fit is relative to the best-scoring extension for the four answers you gave — it is a ranking, not a rating out of a hundred. Change one answer and the order moves, which is the honest way to read any tool like this.

          Developer-Focused Replacements

          The .dev extension has emerged as the most direct substitute for .io in developer communities. Operated by Google Registry, it sits on the HSTS preload list — meaning every browser enforces HTTPS automatically. That technical feature matters for developer tools, APIs, and documentation sites where security credibility is expected. Unlike .io, .dev is a generic TLD with no country-code sovereignty complications.

          The .app extension shares the same HSTS enforcement and reads naturally for product-focused projects. A CLI tool or infrastructure product at brandname.app communicates both technology and polish. Hacker News discussions have positioned .dev and .app as the natural successors to .io for projects where the .com is unavailable.

          A practical note: .dev renewal pricing is higher than .com but substantially lower than .io. Hacker News users have described .dev as carrying a "2-3x .com" premium, which for many projects is manageable — especially compared to .io's trajectory. The dev domain vs io domain page compares the two extensions side by side.

          Moving Away from io: Migration Considerations

          If you already hold an .io domain and are considering a move, the migration itself is the main obstacle. Your current domain may be embedded in customer bookmarks, API endpoints, package registry entries, and search-engine indexes. A clean migration requires maintaining the .io as a redirect for at least twelve to eighteen months while search engines and users transition to the new address.

          The Chagos sovereignty question adds urgency to this planning. A Hacker News thread with over two hundred comments discussed the precedent of retired country-code TLDs and recommended registering backup domains on stable extensions. Even if you do not migrate immediately, holding a .com or .dev equivalent as a defensive registration protects against future disruption.

          The cost calculus favours early action. Holding both an .io and a backup domain temporarily costs more than running a single domain, but it is cheaper than an emergency migration if .io's status changes unexpectedly. The io domain renewal price calculator helps you project the total cost of holding .io alongside the alternative.

          HSTS preload documented by Google Registry. dev pricing '2-3x com' from Hacker News user reports. Chagos discussion hedged with 'reported' and 'as of mid-2026.'

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          Built and maintained by Mustafa Bilgic · Independent — no registrar affiliation, no referral links, no price quotes ·

          Sources

            Sources: Google Registry — HSTS preload documentation, Hacker News — Chagos sovereignty thread (2024), Hacker News — dev domain discussions, Domain Name Wire — io price increase (2026)
          • HSTS preload list — the dev and app zones are preloaded, so browsers refuse plain HTTP on them: hstspreload.org.
          • A generic top-level domain is not a ranking factor: Ahrefs glossary; Semrush.
          • Practitioner reports on extension reputation, pricing and typo loss, quoted with the thread they came from: Hacker News 23799061, 41163433, 41729526.
          • Counterweight on extension reputation — behaviour, not the extension, drives deliverability: Spamhaus.
          • Country-code exposure precedent: CircleID on the vb.ly seizure.