A little help goes a long way.

Keys are emailed within a few minutes of signing up, so check your spam or junk folder first. Each email address gets one key, and signing up again with the same address re-sends it. If it still doesn't arrive, email us from the address you signed up with and we'll send it again.

Microsoft SmartScreen sometimes shows a "Windows protected your PC" notice for newly released installers while they build reputation. Every Limner installer is code signed, and the download page lists the installer's SHA-256 checksum so you can verify the exact file. If you downloaded Limner anywhere other than limnerart.com or our GitHub releases, delete it and download it again from here.

On Windows and macOS, use Help > Check for updates in the app. By default Limner also checks once a day on launch and quietly offers the new version; nothing downloads until you accept. On Windows, turn the automatic check off under Edit > Preferences. You can always install the latest version over the top from the download page; your settings and brushes are kept. On iPad, install beta updates through TestFlight.

Keys apply to Windows and macOS only; on iPad there's nothing to enter, because every feature is already unlocked during the beta. On desktop, activation needs an internet connection for a moment; if you're offline or a firewall is blocking the app, connect and try again from Help > Enter Limner Plus Key. If Limner says your activation has expired after a long stretch offline, going online and using Help > Check for updates (or re-entering your key) renews it. To move a key to another computer yourself, open Help > Enter Limner Plus Key, choose Deactivate this device, then Confirm deactivation (two self-serve deactivations per rolling 30 days). If a key refuses to activate because it's in use on too many devices, email us and we'll free up the old activation.

On Windows, Limner runs on Windows 10 and 11 (64-bit) and is built to work well on modest hardware, including Intel integrated graphics. Minimum: a dual-core CPU, 4 GB of RAM, and any GPU with a working Direct3D 12 or Vulkan driver. Recommended for 4K+ canvases, many layers, and animation: a quad-core CPU, 16 GB of RAM, and 2 GB of VRAM or a modern integrated GPU. Pen pressure works with any Windows Ink compatible tablet. On Mac, Limner needs macOS 13 Ventura or later and runs natively on Apple silicon and Intel. On iPad, Limner needs iPadOS 16 or later; an Apple Pencil is strongly recommended, because fingers operate the interface rather than the brush.

Limner Plus isn't on sale during the beta. When it is, purchases will be processed by Stripe, and your receipt will come from Stripe. For billing questions, refunds, or a lost license key, email us from the address you used at purchase and we'll sort it out.

Yes. Limner is available for iPad as a TestFlight beta, alongside the Windows and macOS builds, and every feature is free and unlocked during the beta. In TestFlight the app is listed as Limner Art; it's the same Limner as on desktop. Limner from Limner LLC is not affiliated with the older Limner tablet utility at limnerapp.com.