No good GPU? The cheapest way to make AI images: a free app, a paid app or a rented GPU

The cheapest way to make AI images without a good GPU is a free app, if you can live with its limits. Bing Image Creator is free with a Microsoft account and gives 15 fast images a day; Higgsfield's free account works too, but every image carries a watermark. Once you pay, a hosted app is the easiest per image (Higgsfield Starter: $19 a month for 270 credits, and a Nano Banana Pro image costs 2 credits, about $0.14). A rented GPU is the cheapest per hour (an RTX 3090 from $0.09 an hour on Vast, $0.50 on Runpod), but only if you're willing to set up and run ComfyUI yourself. Every number here was read on the vendor's own page on Nov 3, 2026.

App or rented GPU: which is cheaper for AI images?

It depends on how many images you make and whether you'll set things up yourself. Here are the three paths side by side.

The honest comparison: one hour on the cheapest Vast RTX 3090 costs less than one Nano Banana Pro image on Higgsfield Starter. But the rented GPU runs open models such as Flux or Stable Diffusion, not the same model, and the hour only pays off if you spend it generating rather than setting up. If you'll make a handful of images a week, an app is cheaper once you count your time. If you'll make hundreds in a sitting with your own workflow, renting wins.

How much does a free AI image app really give you?

Enough to learn, with limits that matter if you want to sell what you make.

• Bing Image Creator. Microsoft's help page says it's "free for everyone with a Microsoft Account (MSA)!" and that "Every day, you'll get a total of 15 free fast image creations". After that you can "continue creating for free at our standard speed if you don't mind waiting", up to 200 prompts in a 24-hour period. We didn't find commercial-use terms on that help page, so check Microsoft's terms before you use the images in a business.
• Higgsfield's free account. Higgsfield's pricing table lists the Free plan as "Limited use" and shows commercial use as not included. Its help center is blunt about the watermark: "On a free account, every generation carries a Higgsfield watermark." Upgrading doesn't clean old files; you regenerate them. Our is Higgsfield free page and the free Higgsfield credits guide cover what new accounts get.

What does a paid AI image app cost per image?

On Higgsfield's Starter plan, about $0.14 per Nano Banana Pro image, and under a cent per image on Higgsfield's own Soul 2.0 model. For eight other image models priced per image, from Google's cheaper Nano Banana 2.1 to the open FLUX and Qwen-Image models you can run yourself, see Nano Banana Pro alternatives.

• Starter: $19 billed monthly for 270 credits a month, which Higgsfield equates to "135 Nano Banana Pro Generations". That's $19 ÷ 135 = about $0.14 per image.
• Plus: $59 billed monthly for 1,200 credits, or 600 Nano Banana Pro images, about $0.10 each.
• Cheaper models cost fewer credits. The same page lists Higgsfield Soul 2.0 at 0.12 credits an image, Nano Banana at 1 credit and FLUX.2 Pro at 1 credit. At Starter's rate (about $0.07 a credit), a Soul 2.0 image is under one cent.
• What you get for the money: no watermark on paid plans, commercial use, and nothing to install. The trade-off is less low-level control than your own ComfyUI workflow.

Credit costs change often, so read the cost the app shows before you press Generate. Our Higgsfield credits explained page tracks them.

How much does it cost to rent a GPU for AI images?

A 24 GB card is the comfortable size for Flux and ComfyUI workflows, and it's cheap by the hour.

• Vast: an RTX 3090 from $0.09 an hour (median $0.20), an RTX 4090 from $0.13 (median $0.47). Vast is a marketplace, so the price, reliability and download speed vary by host.
• Runpod: an RTX 3090 at $0.50 an hour, an RTX 4090 at $0.89 and an RTX A5000 (also 24 GB) at $0.27, at fixed list prices.
• Our live reading: at 20:20 UTC on Nov 3, 2026, our hourly snapshot had the cheapest on-demand RTX 3090 on Vast at $0.0956. Today's prices are on our cloud GPU page.

The software is free: ComfyUI is open source under the GPL-3.0 licence. Check the licence of each model you download before you use the images commercially. Not sure a model fits a card? Check it in our VRAM calculator.

What are the hidden costs of renting a GPU?

Setup time, prepaid credit, and storage that keeps billing.

• Prepaid credit. Vast's billing docs say: "Vast requires pre-payment of credits for GPU rentals."
• Storage while stopped. The same page says: "Stopping an instance does not avoid storage costs." A stopped machine with your models on its disk still costs money until you delete it.
• Setup time is paid time. You pay the hourly rate while the instance boots, ComfyUI installs and the model downloads. Community templates make this much faster, and our cloud GPU for ComfyUI guide walks through it.
• A learning curve. ComfyUI is a node graph. If you've never used it, expect your first session to be learning, not generating.

So which should you pick?

• You want to try AI images today, for free: a free app. Accept the daily limit or the watermark.
• You want good images for a shop, social posts or a client, without managing software: a paid app. Read the credit cost per model and pick the cheapest model that looks right.
• You'll make hundreds of images, want custom workflows, LoRAs or your own models, and you don't mind setup: rent a 24 GB GPU and run ComfyUI. Shut it down after each session.
• You want to know if your own PC can do it after all: see how to run Stable Diffusion locally, or running it on AMD and Intel Arc cards. If you're thinking of buying a card, start with which GPU to buy for Stable Diffusion and Flux.

Plenty of people start on an app to learn what they want, then rent a GPU once they're generating at volume.

Three paths, no graphics card to buy. If you want results now, try the app route; if you want the lowest cost at volume, start with our cloud GPU for ComfyUI guide and today's GPU prices.