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Bitly gives you more than just basic redirects, but the interface feels outdated and key features like real-time tracking are locked behind higher pricing, while Short.io is even more barebones and its reporting is such a mess you probably won't use it.
Stick with Bitly if you need more than the most basic redirects, but avoid Short.io unless you have absolutely no other option.
Short.io only really works for the most basic redirects and falls apart if you need anything more, especially reporting. Its analytics are described as a complete mess, to the point where they just got ignored entirely.
Bitly is outdated and not user-friendly, but at least it's "capable" and can handle link shortening and tracking, even if the experience is clunky and key features are locked behind expensive paid tiers. Its reporting is unnecessarily complicated and lacks real-time updates, but it's still more functional than Short.io, which isn't really usable for tracking at all.
If you have to pick between these two for anything beyond just making a short link, Bitly is the only one that actually gets the job done, even if it's frustrating. Short.io is only for someone who needs the bare minimum and doesn't care about analytics or reporting.
Bitly
Bitly's analytics dashboard
Best URL Shorteners (Bitly vs Short.io vs TinyURL vs Dub)
Best URL Shorteners (Bitly vs Short.io vs TinyURL vs Dub)