AI photo editors compared: Firefly vs Luminar vs free alternatives

The AI photo editing market has split into three camps: Adobe's subscription-plus-credits model built around Generative Fill, Skylum's one-time-buy Luminar Neo, and a cluster of free tools that are far more capable than they used to be. The question isn't which tool has the most AI features — it's which jobs genuinely justify paying.

Here's a practical breakdown of retouching, relighting, and generative fill across the three options, based on current pricing and features as of September 2026.

Adobe Firefly: the generative retoucher's standard#

Firefly is Adobe's family of generative AI models, living both in the standalone web app and — more importantly — inside Photoshop. For photographers, Firefly isn't really a photo editor at all; it's the engine that powers Generative Fill, which remains the single most useful AI editing feature you can buy.

The workflow: select an area of a photo, type a prompt (or leave it blank), and Firefly fills the region with content that matches the surrounding lighting, perspective, and color palette. Blank prompt removes the object and reconstructs the background; a prompt like "a vase of fresh flowers" inserts a new element that actually blends. The companion feature, Generative Expand, outpaints image boundaries to extend a scene — handy for reframing a shot that was composed too tight.

What Firefly does best:

• Object removal on complex backgrounds. Generative Fill doesn't just clone pixels; it regenerates the scene. Removing a car from a street scene can extend buildings and shadows rather than smearing road texture.
• Scene expansion. Outpainting in Photoshop produces believable extensions for most natural and urban scenes.
• Background replacement. Auto-subject selection plus prompt-based scene generation moves a subject into a new environment in a few clicks.

Firefly's structural advantage is its training data. It's trained on Adobe Stock, openly licensed content, and public domain material — content where Adobe has cleared the rights — so Adobe grants explicit commercial usage rights, with IP indemnification on enterprise tiers. If you deliver work to clients, that's the real differentiator versus tools trained on web-scraped data.

The pricing math, as of 2026:

The critical nuance: on paid plans, standard generations — including Generative Fill — are unlimited and don't consume credits at all. Credits are only burned by premium features like AI video generation and third-party partner models. For still-photo retouching, the $19.99 Pro tier is effectively an unlimited generative retouching tool that also bundles Photoshop — which is the realistic entry point, since Generative Fill lives inside Photoshop, not the free web app.

Luminar Neo: the one-time-buy AI editor#

Skylum's Luminar Neo takes the opposite approach to Adobe: a full standalone editor (Mac and Windows) with AI built in from the ground up, sold as a perpetual license instead of a subscription. It also works as a plugin for Lightroom Classic, Photoshop, and Apple Photos, so it can slot into an existing workflow.

Its AI toolset is broad. The headline generative tools are GenErase (object removal with background reconstruction), GenExpand (boundary expansion), and GenSwap (element replacement) — direct competitors to Photoshop's Generative Fill, without leaving the app. Around those sit non-generative AI tools: Sky AI for sky replacement, Relight AI for relighting a scene after the fact, portrait tools including skin retouching and Bokeh AI, and Enhance AI for one-slider RAW development. The 1.27 update added an AI Assistant that takes a written prompt and returns three variations to choose from.

What reviewers consistently find, across months of real use:

• RAW to finished photo in under a minute. Enhance AI plus a couple of AI tools produces client-ready landscape and product shots fast — no Photoshop skills required.
• Fast on Apple Silicon. AI operations reportedly finish in 2–4 seconds on M-series Macs; older Intel machines are noticeably slower (8–12 seconds per operation).
• Relighting and sky tools are genuinely good. Relight AI and Sky AI handle the "rescue a bad-lighting shot" job that generative tools can't touch.

The catches matter. First, pricing has crept: new users paid a $119 perpetual license for the desktop version as of early 2026 (regional deals and bundles run $79–$159), with cross-device and library bundles higher. Second — and this is the fine print that stings — the generative tools (GenErase, GenExpand, GenSwap) reportedly expire after one year on a perpetual license, turning part of your "one-time" purchase back into a subscription-shaped cost. Third, catalog management stays basic: it's fine for enthusiasts editing dozens of photos a week, but underpowered if you're managing a 50,000+ image library.

Free alternatives that are actually usable#

The free tier of this market used to be "good enough for a meme." That's no longer true.

Photopea is the standout. It's a Photoshop-grade editor that runs entirely in the browser, opens PSD, AI, and Sketch files (which none of the other free tools handle), and includes one-click AI background removal. It's free with ads; a $5/month premium removes the ads. For manual retouching — healing brush, clone stamp, layers, masks — it's the closest thing to Photoshop that costs nothing, and it handles the 80% of retouching work that doesn't need generative AI.

GIMP remains the heavyweight open-source option: full layer editing, scripting, professional color management, zero usage limits, zero cost. The tradeoff is well known — it lacks modern AI features, the interface has a learning curve, and you install it rather than opening a tab. For photographers who want a free offline editor with no browser dependency, it's the correct answer.

Pixlr sits between them: a browser editor with AI background removal and an object remover, a gentler learning curve than Photopea, but with ads and export limits on the free tier. Premium starts around $1.99/month.

The honest summary: free tools now cover manual retouching, background removal, and layer-based compositing completely. What they don't offer is generative fill — the ability to invent plausible pixels for removals and expansions. That's the paid wall.

Head-to-head: the three jobs that matter#

Who should pay for what#

Pay for Firefly (via Firefly Pro at $19.99/mo) if: you do client work, product photography, or real estate — anywhere object removal and background replacement are daily tasks. The commercial-use clarity plus unlimited Generative Fill inside Photoshop justifies it the moment AI fill is part of your workflow more than a few times a month. If you already subscribe to Creative Cloud, you're already paying for it.

Pay for Luminar Neo if: you're an enthusiast or semi-pro who wants fast results without learning Photoshop, hate subscriptions, and your main jobs are sky replacement, relighting, and portrait retouching. Just go in knowing the generative tools have a one-year clock, and budget accordingly.

Pay nothing if: your editing is occasional social content, basic retouching, or compositing from existing assets. Photopea plus a free AI background remover covers an enormous amount of real work. The paid tools justify themselves on volume and commerciality — heavy generative fill usage and client deliverables — not on casual editing.

Takeaway#

The paid wall in AI photo editing is narrower than the marketing suggests. Generative fill and commercial licensing are what you're buying from Adobe; relighting, sky replacement, and one-click speed are what you're buying from Luminar. Everything else — manual retouching, background removal, layer compositing — the free tier now handles. Start free, measure how often you actually reach for a feature that isn't there, and pay only when the answer is "weekly."