The short answer. IconKit is the app icon generator. AppIconBuilder exports icons across several platforms. Icon Preview previews the app icon and the menu bar icon. Nucleo and Iconset are library managers — one is the commercial manager that imports, exports, customises and converts icon libraries, the other a free SVG organiser. These are three different jobs and the category name hides it: generating a set, checking how a set looks at the size it will actually be shown, and keeping a set of icons organised. Picking the wrong one wastes an afternoon.

This guide covers 5 app icon tools for macOS. Every fact below is drawn from the same verified records that back each app’s own page. The recommendations are our editorial judgment, not payment.

Quick comparison

App What it is Pricing Licence Version
AppIconBuilder developer utility not published not published —
Icon Preview developer tool Free not published 1.2.0
IconKit design tool not published not published —
Iconset design tool not published not published 2.5.0
Nucleo design tool not published not published 4.2.0

What actually decides this

  • Generating, previewing or managing. A generator takes one source image and produces the platform sizes. A preview shows you what you already have at 16 by 16 and in the menu bar. A manager keeps a library usable. Very few tools do two of the three well.
  • Whether it produces the platform-specific sizes. macOS, iOS and Windows each want a different set with different names and masks. The value of a generator is that it knows the current list, and the list changes when the platform does.
  • Raster or vector workflow. A tool that wants an SVG can regenerate any size on demand. A tool that wants a PNG is locked to whatever resolution you handed it, and the first time you need a new size you find out which one you bought.
  • Where the library lives. An icon library you can keep in a repository is a design system. One that lives in an application is a collection, and the difference shows up the second time someone else needs an icon.
  • How it handles the mask. macOS applies a mask to app icons and menu bar icons are rendered at small sizes with fixed padding. A tool that does not let you check the masked result is asking you to ship something you have not seen.

Our picks

  • IconKit — Its record describes an app icon generator, which is the generation case. Choose it when you have one source image and need a full icon set from it.
  • AppIconBuilder — Its record describes exporting icons for multiple platforms, which is the multi-platform case. Choose it when the set has to be produced for more than one platform.
  • Icon Preview — Its record describes previewing an app icon and a menu bar icon, which is the preview case. Choose it when what you need is to see how an icon looks at the sizes it will be shown.
  • Nucleo — Its record describes importing, exporting, customising and converting icon libraries, which is the library case. Choose it when the job is keeping an icon library usable across a team.
  • Iconset — Its record describes a free, cross-platform and fast SVG icon organiser and manager, which is the free-organiser case. Choose it when you want a free organiser for an SVG icon collection.

The apps

AppIconBuilder

AppIconBuilder is a developer utility for macOS. Export icons for multi-platform. Its pricing is not published.

Full profile and verified facts for AppIconBuilder →

Icon Preview

Icon Preview is a developer tool for macOS. Preview your app icon and menu bar icon. It is free.

What it does. Preview your app icon and menu bar icon. Preview how your macOS app icon will look in the Dock and how your menu bar item icon will appear.

Icon Preview is listed with current version 1.2.0.

Full profile and verified facts for Icon Preview →

IconKit

IconKit is a design tool for macOS. App icon generator. Its pricing is not published.

Full profile and verified facts for IconKit →

Iconset

Iconset is a design tool for macOS. Free, cross-platform and fast SVG icon organizer and manager for Mac and Windows. Its pricing is not published.

What it does. Best SVG icon sets, icon kits & icon packs organizer and manager app for designers, developers and teams. Works on both macOS and Windows!

Iconset is listed with current version 2.5.0.

Full profile and verified facts for Iconset →

Nucleo

Nucleo is a design tool for macOS. Icon manager. Import, export, customize and convert icon libraries. Its pricing is not published.

What it does. Explore the Nucleo icons, 40000+ icons for UIs, presentations, and print projects. Download instantly or use them via our web and native apps.

Nucleo is listed with current version 4.2.0.

Full profile and verified facts for Nucleo →

How to choose

Common mistakes

  • Resizing one PNG by hand and calling it an icon set. The masks and the platform expectations are the work, and they are exactly what the tools exist to do.
  • Using a generator to manage a library. Generation is a pipeline; a library is a collection, and the two do not share a data model.
  • Shipping an icon without looking at it masked and at 16 by 16. Both views are how the icon is actually seen.
  • Trusting the size list in a tool you last opened a year ago. The platform list is the part that goes stale.

How this guide was put together

Each app’s facts come from its own record: the developer’s own pages and repository, the App Store listing where one exists, and the documentation, each with a source grade and an access date. Where a fact rests on the developer’s own statement rather than on something we verified independently, the sentence says so. Where our data has no value for something, the guide says “not published” instead of guessing.

A price appears here only where the record carries one from a stated source; the guide never estimates one, and it records the pricing model alongside so the two can be read together. Prices change and vary by region, so each app links to its own page for the current detail.

The facts and the recommendations are kept apart on purpose. Everything in the app entries, the comparison table and the answers above is composed from the records. The short answer, the criteria and the picks are our editorial judgment: they reflect what we would choose and why, and they are not paid for. Where we make a recommendation we name the condition it applies under, because we do not call anything “the best” without explaining the criteria.

Frequently Asked Questions

How do I choose between these app icon tools?

There is no single answer — it depends on what you need. This guide covers 5 app icon tools: AppIconBuilder, Icon Preview, IconKit, Iconset and Nucleo. They differ mainly in pricing model, licence and the trade-offs each one carries. Pick by the trade-off you care about rather than by rank.

Are these app icon tools free?

Pricing across this group: not published (AppIconBuilder, IconKit, Iconset and Nucleo) and free (Icon Preview). Where we list pricing as not published, the developer does not state a model we could verify — check their own site before assuming anything about cost. We quote a price only where the record carries one from a stated source, and we never estimate one. Prices change and vary by region and by store, so always check the developer’s own page for the current figure.

Which of these app icon tools are open source?

None of them are recorded as open source in our data.

Do these app icon tools support Apple Silicon?

Our data does not carry an explicit Apple Silicon statement for any app in this group, so we do not claim one. The absence of a statement is not the same as the absence of support.

How do I choose between them?

Start with how you pay: the guide groups these apps by pricing model, because the budget is the constraint most people actually have. Then check the trade-offs listed for each app: the limitations are the part that decides most people’s choice, because they describe what the app will not do for you.