Acorn is a native Mac image editor from Flying Meat Software that covers everyday photo editing and graphic design work without the overhead of a full creative suite.
What is Acorn?
Acorn is a Mac-first raster image editor built specifically for people who need real editing power but refuse to pay a monthly subscription for tools they only use occasionally. It handles layers, masks, filters, vector shapes, and non-destructive adjustments in an interface that actually gets out of your way. I've had it open nearly every day for months — resizing screenshots, compositing UI mockups, touching up product photos — and it has never once felt bloated or slow.
What does Acorn do best?
Acorn's strongest suit is the combination of a shallow learning curve with genuinely deep capability underneath. Open a file and the toolbar is minimal; dig in and you find a full layer stack, blend modes, non-destructive filters, Curves and Levels adjustments, a healing brush that actually works, and a scriptable AppleScript/JavaScript automation layer.
- Layers and masks — full non-destructive stack with group layers, clipping masks, and per-layer blend modes
- Vector tools — Bezier shapes that live on their own vector layer, editable at any scale
- Filters and effects — Core Image filters plus Acorn's own, previewed live as you drag sliders
- Healing and retouching — content-aware fill and healing brush handle backgrounds cleanly
- Automation — batch processing and scriptable actions for repetitive tasks
The export workflow is also notably clean: the Export For Web panel gives you side-by-side format previews and file-size estimates before you commit, which is exactly what you want when optimizing images for a CMS or an app.
How much does Acorn cost?
Acorn is a one-time purchase from the Mac App Store and the developer's own site — no subscription, no cloud lock-in, no feature gating. There is a fully functional free trial available directly from Flying Meat, so you can run it against your actual workflow before spending a cent. Given what you'd pay for a single month of Photoshop, the price is essentially nothing for a tool you'll keep for years.
Who should use Acorn?
Acorn is the right tool for Mac users who outgrew Preview years ago but have no desire to navigate Photoshop's sprawling panel system. If you're a developer who edits app icons and screenshots, a blogger who touches up images before publishing, a designer who wants a fast scratchpad alongside Figma, or a small-business owner creating social assets — Acorn fits. It is not a Lightroom replacement for bulk RAW processing, and it's not a vector-first tool like Sketch or Affinity Designer. Know what it is, and it will rarely disappoint.
What are the best Acorn alternatives?
The most direct alternative is Affinity Photo 2, which is also a one-time purchase and goes deeper on RAW processing and 32-bit HDR compositing — at the cost of a steeper learning curve. Pixelmator Pro is closer in spirit to Acorn and leans harder into machine-learning tools like Super Resolution and ML-enhanced selection; it's a genuine rival and the choice comes down to personal feel. Photoshop remains the industry benchmark but demands a Creative Cloud subscription and carries years of legacy UI complexity. For truly lightweight work, Preview is built in and free, but you'll hit its ceiling fast. I keep Acorn installed because it sits in the sweet spot between Preview's triviality and Affinity Photo's depth.
How does Acorn compare to Pixelmator Pro?
Both are excellent Mac-native, one-time-purchase editors that run natively on Apple Silicon. Pixelmator Pro has a stronger machine-learning feature set — object removal, upscaling, and background replacement are impressive — and its nondestructive editing model is slightly more refined. Acorn counters with a longer track record, a more hackable automation layer, and an interface that some people find even less cluttered. If you lean on ML-driven retouching, try Pixelmator Pro first. If you write scripts or prefer keyboard-driven workflows, Acorn is the more comfortable home.
