Being Tricky
The short answer
You can't install the real Cydia without a jailbreak, and there's no public jailbreak for current iOS 26.
At a glance
About 20 minutes · Medium · For iPhone
Key point 1 of 5
Cydia only runs on a jailbroken iPhone, and current iOS 26 releases have no public jailbreak.
Key point 2 of 5
"Cydia without jailbreak" sites install look-alike web pages, risky configuration profiles or survey scams.
Key point 3 of 5
Remove unknown profiles in Settings → General → VPN & Device Management.
Key point 4 of 5
AltStore and Sideloadly install apps without a jailbreak; free Apple IDs allow 3 apps refreshed every 7 days.
Key point 5 of 5
Only sideload apps from the developer's own site or GitHub page.
Quick tip
Only sideload .ipa files from the developer's own website or GitHub page.
Watch out
Never install a configuration profile from a site offering Cydia, free apps or "jailbreak tools".
You might ask
Is there a jailbreak for iOS 26? Not a public, full jailbreak for current iOS 26 releases.
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Being Tricky