Feather vs Scarlet: Which iOS Sideloading App Is Better?
Feather is the name that keeps coming up wherever ESign used to be mentioned. It is a free, open-source, on-device IPA signer that appeared as the community’s answer to ESign’s decline — and the natural question for readers here is how it stacks up against Scarlet. They are not quite the same kind of tool, and that difference matters more than any feature list. This comparison covers how each one signs apps, what each demands from you before the first install, and which one fits which kind of user.
The Core Difference: Signer vs Ecosystem
Feather is a signer. You bring it an IPA file and a certificate, and it signs and installs the app on your device. That is the whole job, done cleanly: multiple certificate management, signing options such as bundle ID changes, and a tidy library of what you have installed.
Scarlet is an ecosystem. It signs and installs too, but wrapped around that core is a repo system for browsing and updating apps, tweak injection, backup and restore, and a shared certificate that lets a total beginner install their first app within minutes of downloading Scarlet itself.
If you have read our ESign vs Scarlet comparison, Feather will feel familiar: it occupies ESign’s old niche, modernised and open source. The contest is once again “bring your own certificate and sign exactly what you choose” versus “open the app and browse a library.” Neither framing is a criticism — they are answers to different questions, asked by users at different points in their sideloading lives.
Feather vs Scarlet at a Glance
| Feather | Scarlet | |
|---|---|---|
| Primary job | Signing IPA files you supply | Browsing repos + installing and managing apps |
| Certificate needed to start | Yes — you must import your own (.p12 + .mobileprovision) | No — ships with a shared certificate; your own can be imported later |
| Cost | Free and open source | Free |
| App discovery | Supports adding repo/source URLs, but discovery is secondary | Repos are the centre of the experience; see our best Scarlet repos guide |
| Revoke exposure | Only as risky as your own certificate | Shared certificate dies in public revoke waves unless you import your own |
| Tweak injection | Signing options cover common modifications during signing | Built-in tweak injection for .deb/.dylib during install |
| Backup/restore of apps | Basic app management | Dedicated backup and restore features |
| Learning curve | Moderate — assumes you understand certificates | Low to start, deeper as you customise |
Getting Started: The Real Dividing Line
Feather cannot sign anything until you import a certificate — there is no shared certificate bundled with it. For experienced sideloaders that is a non-issue; for a newcomer it is a wall, because obtaining a certificate is the least beginner-friendly part of this entire hobby. The process is the one we walk through in our Scarlet certificate import guide — the same .p12 and .mobileprovision pair works in Feather — but you have to do it before Feather does anything at all.
Scarlet inverts that: install it, the included shared certificate signs your first apps immediately, and you only meet the certificate system when a revoke pushes you to learn it. That on-ramp is Scarlet’s biggest advantage and explains most of its user base.
Stability and Revokes
Once both are running on the same quality of certificate, stability is equal — because stability is the certificate. The difference is the default. Feather users are on their own certificate by definition, so they never experience the public revoke waves that periodically take down every shared-certificate Scarlet install at once. Scarlet users who import their own certificate reach the same position; Scarlet users who never do will keep having bad weeks. Neither app can protect a certificate Apple has decided to kill, and neither app deserves blame when it happens.
Features Beyond Signing
Scarlet is the richer environment day-to-day: repos that refresh app libraries automatically, injection of tweaks at install time, backups you can restore after a revoke, and several install methods including a computer-based one. Feather is deliberately leaner — a well-organised signed-app library, certificate switching for people who keep several, and signing options presented without clutter. It also has the quiet advantage of being open source: its code can be inspected, which matters to users who (reasonably) want to know what a tool with their signing certificate inside it is doing.
Which One Should You Use?
- You are new to sideloading: Scarlet. Start with the shared certificate, learn the ecosystem, and graduate to importing your own certificate when you are ready.
- You already own a certificate and just sign specific IPAs: Feather. It is purpose-built for exactly that workflow and stays out of your way.
- You are done with revoke waves: Either — the fix is the certificate, not the app. Feather forces the issue; Scarlet lets you import the same certificate whenever you choose.
- You browse repos and tweaked apps: Scarlet, comfortably.
- You want both: A common setup is Scarlet for discovery and Feather as the calm fallback signer for the apps you cannot live without.
And if you are weighing the whole field rather than just these two, our roundup of the best Scarlet alternatives covers the other serious options.
A Word on Sources and Downloads
Because both apps are distributed outside the App Store, impostor copies circulate — a recurring problem for every popular signer. Feather’s open-source nature gives it a specific defence: there is one canonical home for the project, its code is public, and releases can be checked against it. Scarlet’s defence is its long-standing official website. The rule that protects you with both is the same one that applies across this entire site: never download a signer from a random mirror, a video description, or a page promising it “with a free certificate included.” A signer holds your certificate and touches every app you install; it is the last piece of software whose provenance you should be casual about. If a download page for either app is plastered with countdown timers and fake download buttons, you are in the wrong place.
FAQ
Is Feather better than Scarlet?
For signing your own IPAs with your own certificate, Feather is the cleaner tool. For discovering, installing and managing apps as a beginner, Scarlet is better. They overlap in the middle — both sign and install — but their starting points are opposite.
Does Feather need a certificate?
Yes, always. Feather has no built-in shared certificate, so you must import a .p12 certificate and provisioning profile before it can sign anything. If you already import certificates into Scarlet, you already have what Feather needs.
Is Feather free and safe?
Feather is free and open source, which lets anyone inspect its code — a genuine trust advantage. As with every signer, safety still depends on downloading Feather itself from its official source and only signing IPAs you trust.
Can I use Feather and Scarlet on the same iPhone?
Yes. They coexist without conflict, and many users run Scarlet for repo browsing while keeping Feather configured with a private certificate for their essential apps.
Why do people say Feather replaced ESign?
Because it fills the same role — an on-device signer driven by imported certificates — with an actively maintained, open-source codebase, at the time ESign’s development stalled and its trust faded. Users migrated, and the workflow knowledge transferred almost one-to-one.
