Best iOS Version for Sideloading in 2026

ByScarlet iOS Team Updated on

Best iOS Version for Sideloading in 2026

Choosing the right iOS version for sideloading is one of those questions that seems simple on the surface but has a genuinely nuanced answer, because the answer depends on which tool you want to use. If you are planning to sideload apps using Scarlet iOS and want to know which iOS version actually gives you working results in 2026, this is the guide for you.

We will look at what is actually confirmed for TrollStore, Scarlet iOS, AltStore, and Sideloadly as of October 2026, so you can match your iPhone or iPad to the right tool instead of guessing.

Why iOS Version Matters for Sideloading

Sideloading tools rely on certificate signing, a mechanism that lets apps run outside the App Store using a free Apple ID, a paid developer account or, in Scarlet iOS’s case, a shared certificate. Apple can revoke these certificates at any time, which stops the signed apps from opening until you reinstall or re-sign them.

Beyond certificate revocation, the tools themselves are built differently. Some, like TrollStore, use a method that only works on specific older iOS versions. Others, like Scarlet iOS, AltStore, and Sideloadly, use certificate-based signing that works across a much wider range of versions but still has limits on the newest releases.

For a detailed explanation of how the signing process works, see our guide on what is Scarlet iOS and how does it work in 2026.

TrollStore: Only for Specific Older Versions

TrollStore is a permanent, certificate-free installation method that does not need re-signing every few days. The catch is that it only works on a narrow range of iOS versions: iOS 14.0 through 16.6.1, and iOS 17.0. It does not work on iOS 17.1 or later, and it does not work on iOS 18, iOS 26, or iOS 27.

If your device is already running one of those supported versions and you have not updated past iOS 17.0, TrollStore is worth considering because of its permanence. But if you are already on iOS 18 or newer, there is no way to get TrollStore running without being on different hardware or a device that was never updated, since you cannot downgrade past Apple’s signing window.

Who TrollStore Is For

  • Users with a spare device still on iOS 14.0 to 16.6.1, or exactly iOS 17.0
  • Users who want apps to stay installed without repeated re-signing
  • Not an option for anyone already running iOS 18, iOS 26, or iOS 27

Scarlet iOS: The Widest Supported Range

Scarlet iOS works on iOS 14 through iOS 26, which covers the vast majority of iPhones and iPads in use today. It installs directly from Safari with no computer required, and it uses certificates that Apple can revoke, so apps may occasionally need reinstalling.

For iOS 27, which has been publicly available since September 14, 2026, there are third-party reports that Scarlet iOS also works, but this is not officially confirmed as of October 2026. If you are on iOS 27 and want to sideload, it is reasonable to try, but you should treat it as unconfirmed rather than guaranteed.

Depending on how an app is signed, Developer Mode, introduced in iOS 16, may also need to be turned on. You can enable it under Settings, then Privacy and Security, then Developer Mode, followed by a restart. Trusting the certificate afterward is done under Settings, then General, then VPN and Device Management.

AltStore and Sideloadly: Confirmed Through iOS 26

AltStore and Sideloadly are both confirmed to work up to iOS 26. Neither has confirmed support for iOS 27 at this time. Unlike Scarlet iOS, both require a computer: AltStore needs the AltServer companion app running, and Sideloadly needs its desktop application, so they are a better fit if you already keep a laptop or desktop nearby for re-signing apps on a schedule.

If your priority is installing straight from your iPhone with no computer involved, Scarlet iOS remains the more convenient option, while AltStore and Sideloadly suit users who prefer a desktop-based workflow.

Free Apple ID vs Paid Developer Account

Whichever certificate-based tool you use, how long an app stays signed depends on the Apple ID behind it. A free Apple ID lets apps run for seven days before they need reinstalling, and it limits you to three sideloaded apps active at once. A paid Apple Developer account, which costs 99 USD per year, extends that signing period to up to a year and removes the three-app limit.

EU Users: Alternative Marketplaces on iOS 17.4 and Later

If you are in the European Union, the Digital Markets Act gives you an additional option that does not exist elsewhere. Since iOS 17.4, EU users can install alternative app marketplaces and web-distributed apps directly, outside of certificate-based sideloading entirely. Apple has since opened alternative marketplaces in Japan (iOS 26.2 and later) and Brazil as well, but web distribution is listed for the EU only. Outside those regions, this option is not available and you still need Scarlet iOS, AltStore, Sideloadly, or TrollStore depending on your iOS version.

Should You Update Immediately When a New iOS Version Drops?

A cautious approach is usually best. When Apple releases a new iOS version, certificate behavior can change, and it takes some time for sideloading tools and their communities to confirm whether anything broke. Before updating, check the Scarlet iOS blog or your sideloading tool’s official channels for compatibility notes on the new version rather than updating the moment it is available.

This matters even more if you are relying on TrollStore, since any update at all can move you out of its supported range permanently with no way back.

How iOS Updates Affect Your Existing Sideloaded Apps

Updating iOS does not automatically remove your sideloaded apps. The apps remain installed, and their data is preserved. However, if a certificate was revoked prior to your update, or the update changes how the system validates certificates at launch, some apps may refuse to open afterward.

If that happens, the fix is straightforward: open Scarlet iOS and reinstall the affected apps. The signing process applies a fresh certificate, and the apps work again. Installing a new build over the existing app normally keeps its data; deleting the app first removes it.

For a deeper dive into this topic, see our full guide on how iOS updates affect your sideloaded apps.

The Special Case: Jailbreak-Compatible iOS Versions

Some users maintain a specific older iOS version specifically because it supports a public jailbreak. This is a legitimate strategy, but it involves accepting significant security risk and losing access to years of patches. For users who simply want to sideload apps without the complexity of jailbreaking, Scarlet iOS on a current iOS version is the recommended approach.

The jailbreak route makes sense if you need deep system-level modifications. For app sideloading alone, it is unnecessary overhead.

Recommendations by Use Case

  • Everyday iPhone on iOS 14 through iOS 26: Scarlet iOS, no computer needed
  • Already on iOS 27: Scarlet iOS is reported to work by third parties but is not officially confirmed; AltStore and Sideloadly are not yet confirmed on iOS 27 either
  • Have a computer and prefer a desktop workflow: AltStore or Sideloadly, confirmed through iOS 26
  • Still on iOS 14.0 through 16.6.1, or exactly iOS 17.0: TrollStore for permanent installs without re-signing
  • Living in the EU, Japan or Brazil: Alternative app marketplaces are also available (in the EU from iOS 17.4, in Japan from iOS 26.2)

Download Scarlet iOS for Your iOS Version

Whatever version you are running from iOS 14 through iOS 26, Scarlet iOS has you covered, and it is also worth trying on iOS 27 with the understanding that support there is not yet officially confirmed. The installer is updated to track new iOS releases, so check back for the latest compatibility status before you sideload.

Visit Scarlet iOS to download and start installing apps on your current iOS version today.

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