Render a House/Updated Sep 25, 2026ChatGPT vs Krea for architects: which should you use?
Pick ChatGPT if you want one subscription that writes, researches and edits an image through conversation; pick Krea if images are the main job and you want real-time sketching, many models and upscaling to 22K on paid plans. Both start from a prompt or a picture, not your model. Render a House is the alternative for turning a 3D model or a sketch into a render, in a browser, with no GPU.
The short answer
Pick ChatGPT if you want one subscription for writing, research and images, and you like to refine a single picture in conversation: Plus is $20 a month. Pick Krea if images are the job: it updates as you draw, puts many image and video models in one place, and upscales to 22K on Pro, from $21 a month billed yearly.
If you have a 3D model or a sketch and want a render of that design, neither is built for it. Render a House takes a GLB, OBJ, sketch or screenshot, runs in a browser with no GPU, returns a concept render in roughly 30–60 seconds, and is free for 3 renders a day. Last updated: September 25, 2026.
ChatGPT vs Krea at a glance
From each vendor’s own pages. Unpublished figures are marked.
| Dimension | ChatGPT | Krea | Render a House |
|---|---|---|---|
| What it is | OpenAI's general assistant, with ChatGPT Images built in | A creative AI suite for image, video and 3D generation, editing and upscaling | An AI rendering tool built for architecture and interiors |
| Input it needs | A prompt or an uploaded image; mobile also takes a drawn sketch | A prompt, an image, or a drawing on its real-time canvas | A sketch, plan, 3D model (GLB, GLTF, OBJ), CAD screenshot or photo |
| Where it runs / hardware | Images on web, iOS and Android, plus desktop apps; cloud, no GPU | Web app; generation runs on Krea's servers, no GPU | Any browser, Mac included, no GPU |
| Price (vendor list price, checked Sept 2026) | Go $8/mo, Plus $20/mo, Pro from $100/mo | Pro $35/mo, Max $105/mo, Business $200/mo; 40% less billed yearly | Pro $39/mo, Studio $99/mo |
| Free tier | Yes, limited image creation | Yes, 100 compute units a day, no credit card | 3 renders a day, small watermark |
| Time to a first image | May take a few minutes, depending on complexity | Real-time models update as you type or draw; other models: Not published (checked Sept 2026) | Roughly 30–60 seconds, up to about two minutes under load |
| Output | Any aspect ratio. Resolution: Not published (checked Sept 2026) | Images, video and 3D objects; upscaling to 2K free, 22K on paid plans | Concept render at 1K, 2K or 4K on Pro, plus video |
| Best for | Refining one image in conversation, next to writing and research | Fast visual exploration across many models, then upscaling | A 3D model or a sketch to an architectural render |
Sources: ChatGPT pricing, Images in ChatGPT, ChatGPT downloads, Krea pricing, krea.ai.
Where ChatGPT is better
ChatGPT’s image tool lives inside a conversation, next to writing, research and projects.
Editing one area of an image
Highlight a facade or a sky with the selection tool and describe the change, per help.openai.com. Edits can spill past the selection, OpenAI notes.
One subscription for the whole brief
Plus at $20 a month covers deep research, projects and writing as well as images, per chatgpt.com/pricing.
Unlimited images at the top tier
ChatGPT Pro, from $100 a month, lists unlimited and faster image creation, subject to abuse guardrails, per chatgpt.com/pricing. Krea’s plans meter compute units instead.
Where Krea is better
Krea is built for image work alone, with a free plan of 100 units a day and paid plans that add upscaling and more models.
Images that follow your pen
Real-time models generate as you type or draw, and the free plan includes them, per krea.ai/pricing. For loose massing studies that loop is fast.
Many models in one app
Krea’s own Krea 2 sits next to third-party models such as GPT Image 2.5, Nano Banana, Seedance, Kling and Veo, plus 3D object generation, in one account, per krea.ai.
Upscaling and a trained house style
Paid plans upscale up to 22K, including Topaz Standard, and LoRA training on 50 images (2,000 on Max) teaches the models a studio look, per krea.ai/pricing. ChatGPT publishes no output resolution.
Pricing: ChatGPT vs Krea
US list prices from ChatGPT pricing and Krea pricing, checked September 2026. Plans change often.
| Plan | Price | What it includes | Notes |
|---|---|---|---|
| ChatGPT Free | $0 | Limited image creation | Same image tool as paid plans, fewer images (source) |
| ChatGPT Go | $8 / mo | More image creation | May include ads (source) |
| ChatGPT Plus | $20 / mo | More complex and accurate image creation | Adds images with thinking (source) |
| ChatGPT Pro | From $100 / mo | Unlimited and faster image creation | Three usage tiers; subject to abuse guardrails (source) |
| Krea Free | $0 | 100 compute units a day, real-time models | No credit card; upscaling to 2K (source) |
| Krea Pro | $35 / mo, or $21 / mo billed yearly | 20,000 units a month, all video models | Most popular; LoRA training on 50 images (source) |
| Krea Max | $105 / mo, or $63 / mo billed yearly | 60,000 units a month | LoRA training on up to 2,000 images (source) |
| Krea Business | $200 / mo, or $160 / mo billed yearly | 80,000 units a month, up to 50 seats | Enterprise is custom pricing (source) |
| Render a House Free | Free | 3 renders a day | Failed renders do not use credits |
| Render a House Pro | $39/mo or $312/yr | 240 credits | Failed renders do not use credits |
| Render a House Studio | $99/mo or $792/yr | 1,000 credits | Failed renders do not use credits |
Krea compute units, ChatGPT image limits and Render a House credits are not comparable. On Render a House a 1K render is 1 credit and a 4K Pro render 4.
Which should you choose?
Solo architect who also writes: ChatGPT
One Plus subscription covers competition text, client emails and the odd reference image, refined in the same conversation.
Visual studio exploring options: Krea
Real-time sketching for early ideas, several models to compare, and 22K upscales for boards. The free 100 units a day is enough to try it.
A 3D model or a sketch to render: Render a House
Upload the GLB, a SketchUp, Revit, Archicad or Rhino screenshot, or the sketch, and the render starts from your geometry.
No GPU, any laptop: all three work
All three run in the cloud. Choose by the input you have.
Render a House as the no-GPU alternative
ChatGPT and Krea make images from what you describe or draw. Render a House renders the design you already have.
Render a House is an AI rendering tool for architects, interior designers and real estate. Upload a GLB, OBJ or screenshot in any browser, describe materials and light, and a render comes back in roughly 30–60 seconds.
| Dimension | ChatGPT and Krea | Render a House |
|---|---|---|
| What it does | Generate and edit images from prompts, pictures and sketches | Turns sketches, plans and 3D models into concept renders |
| Input | Text and images; neither documents rendering a GLB or OBJ | GLB, GLTF or OBJ models, sketches, plans, screenshots, photos |
| Geometry | Neither documents keeping walls and openings in place | Generally preserved, though it can shift |
| Where it runs | Web apps (ChatGPT also on mobile and desktop), cloud-hosted | Any browser, Mac included, no GPU, no plugin |
| Price to start | Free tiers; paid from $8 (ChatGPT) or $21 billed yearly (Krea) | Free 3 a day; Pro $39/mo for 240 credits |
| Output | Images; only Krea states a size, via upscaling to 22K | 1K, 2K or 4K on Pro, plus video; commercial use allowed |
What it cannot do
- Chat, write or research the way ChatGPT does.
- Offer many models or update live as you draw, like Krea. Each render takes about 30–60 seconds.
- Run inside your CAD app or read .skp files. You upload an export or a screenshot.
- Produce BIM data, measured drawings or a final production render. It is a concept image and geometry can shift.
ChatGPT vs Krea: the verdict
For an architect who needs an assistant first and images second, ChatGPT is the better buy. For a studio where images are the product, Krea gives more: real-time drawing, many models and 22K upscales, starting free.
Both start from words or a picture, not your model. When the design exists as a 3D file or a sketch, Render a House fits better, free for 3 renders a day. For the wider field, see the best AI rendering tools for architects.
Common questions about ChatGPT vs Krea
Is ChatGPT better than Krea for architectural images?
- Neither wins across the board. ChatGPT is stronger for refining one image in conversation; Krea for fast exploration, model choice and large upscales. Neither is built to render a 3D model.
Is Krea free?
- Yes. Krea's free plan gives 100 compute units a day with no credit card, including real-time models and upscaling to 2K. Pro is $35 a month, or $21 billed yearly.
Is ChatGPT free for image generation?
- Yes, with limits. The Free plan lists limited image creation, and Go ($8/mo), Plus ($20/mo) and Pro (from $100/mo) raise that, with Pro listing unlimited and faster image creation.
Does Krea run on Mac?
- Yes. Krea is a web app, so it runs in a Mac browser with no local GPU. So do ChatGPT and Render a House.
Can I use ChatGPT or Krea without a 3D model?
- Yes. Both work from a prompt or an image, and both accept a sketch: ChatGPT in its mobile app, Krea on its real-time canvas. Neither documents keeping your geometry fixed.
What is the best alternative to ChatGPT and Krea for renders?
- Render a House, if you start from a 3D model or a sketch. It reads GLB, GLTF and OBJ files or a CAD screenshot, renders in roughly 30–60 seconds in a browser, and is free for 3 renders a day. It is not a chat assistant or a multi-model suite.
Have a model or a sketch? Upload the view you already have and see what comes back. Render your model free.
Keep comparing:
- ChatGPT vs Gemini — Two general assistants on image editing, downloads and price.
- Krea vs Magnific — Generation suite or specialist upscaler, free tiers and 2026 prices.
- Midjourney vs ChatGPT — Two general image generators on renders: style, edits and price.
- Best AI rendering tools for architects — The dedicated rendering tools, compared on input, output and price.
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