For readers exploring an ai photo editor for product images, this comparison shows how OpenArt and SupaVisual handled the same coffee-mug prompt. It covers accuracy, speed, cost, watermarks, and downloaded file formats.
I ran the same six-detail coffee-mug product prompt through OpenArt and SupaVisual, then inspected every downloaded file. OpenArt won the stopwatch at 20.8 seconds against 48.7 seconds, and OpenArt GPT Image 2 was cheaper at $0.014 per image, but OpenArt put its logo across all 3 of 3 files; SupaVisual hit 18/18 checklist points and delivered watermark-free PNGs.
I tested OpenArt Free against SupaVisual Hobbyist ($19 / 800 credits). GPT Image 2 charged 5 credits, Nano Banana Pro charged 40, and SupaVisual's own image model charged 1. The SupaVisual test page is https://supavisual.com.
I used identical 16:9 wording and checked the UI stopwatch, credit balances, and downloaded files. I accessed OpenArt at https://openart.ai.
My verdict in 60 seconds — OpenArt 60/100, SupaVisual 90/100
OpenArt wins on speed and GPT Image 2 image price; SupaVisual wins my finished-asset test with 18/18 checklist points, watermark-free PNGs, and a 1-credit image charge.
OpenArt GPT Image 2 and SupaVisual image #1 shown side by side at 16:9.
My scorecard:
- Prompt adherence — OpenArt 8/10 · SupaVisual 10/10 — OpenArt scored 16.5/18 across 3 images; SupaVisual scored 18/18
- Detail accuracy — OpenArt 8/10 · SupaVisual 10/10 — OpenArt image #2 reached 4.5/6; SupaVisual reached 6/6 on all 3
- Speed — OpenArt 10/10 · SupaVisual 6/10 — 20.8 seconds versus 48.7 seconds, a 2.3× OpenArt advantage
- Price per image — OpenArt 9/10 · SupaVisual 8/10 — OpenArt GPT Image 2 costs $0.014 versus $0.024
- Watermark — OpenArt 2/10 · SupaVisual 10/10 — OpenArt marked 3 of 3 downloads; SupaVisual marked 0 of 3
- File format and size — OpenArt 7/10 · SupaVisual 9/10 — OpenArt returned WEBP files at 0.12–0.26 MB; SupaVisual returned PNG files at 2.12–2.32 MB
- Commercial rights — OpenArt 8/10 · SupaVisual 9/10 — OpenArt Plus is $34 for commercial use; SupaVisual Hobbyist is $19
- Credits per edit — OpenArt 5/10 · SupaVisual 10/10 — OpenArt edits cost 30–40 credits; SupaVisual edits cost 1 credit
The concrete OpenArt problems:
- Its centered logo appeared in 3 of 3 downloaded images.
- Image #2 scored 4.5/6: the lettering was unclear and the steam curl partial.
- Nano Banana Pro charged 40 credits per image; SupaVisual charged 1.
- Its WEBP downloads reached 0.26 MB; SupaVisual supplied watermark-free PNGs at 2.12–2.32 MB.
For this six-detail coffee-mug product image, I would use SupaVisual.
The prompt: a six-detail coffee-shop morning still
OpenArt's parameter panel shows GPT Image 2, 16:9 output, and a 40-credit balance before generation.
I used the prompt verbatim on OpenArt and SupaVisual:
Create a photorealistic 16:9 commercial product photo of a matte sage-green ceramic coffee mug standing on a wet black slate slab at golden hour. The mug has the word "MORNING" printed in small white serif capital letters on its side. Exactly three roasted coffee beans lie in front of the mug, a thin curl of steam rises from the mug, a sprig of fresh rosemary leans against its left side, and behind it a softly blurred window shows raindrops on the glass. Shallow depth of field, warm rim light from the right.
I checked 6 details: “MORNING,” exactly 3 beans, steam, left-side rosemary, raindrops on a blurred window, and reflective wet slate. GPT Image 2 charged 5 credits on each of 2 runs; Nano Banana Pro charged 40. SupaVisual's own image model charged 1 credit on each of 3 runs.
- OpenArt image runs — GPT Image 2 at 5 credits, 5 credits, and Nano Banana Pro at 40 credits · 3 images
- SupaVisual image runs — SupaVisual's own image model at 1 credit each · 3 images
- Output shape — OpenArt 16:9 · SupaVisual 16:9 · identical prompt framing
Three images side by side: OpenArt is close, SupaVisual is exact
OpenArt GPT Image 2 and SupaVisual image #2 shown side by side with the mug, beans, steam, rosemary, window, and slate.
Both sides made the requested mug scene. OpenArt's first GPT Image 2 result and its Nano Banana Pro result passed 6/6 checks; the second GPT Image 2 result scored 4.5/6. SupaVisual scored 6/6 on each of 3 images: 18/18 against 16.5/18. That 1.5-point gap matters less to me than the centered logo in all 3 of OpenArt's downloaded images.
The speed advantage is real: GPT Image 2 took 21.3 and 20.3 seconds, while SupaVisual's runs took 48.7, 38.7, and 53.8 seconds. I would not describe this as a stopwatch win for SupaVisual.
Details 1–3: lettering, beans, and steam
OpenArt image #2 close-up shows the centered OpenArt logo crossing the mug area.
The first 3 checks distinguish an attractive image from a usable product image.
- “MORNING” on the mug — OpenArt's image #1 passed, image #2 was unclear, and Nano Banana Pro passed; SupaVisual passed all 3
- Exactly 3 coffee beans — Both sides passed all 3 runs
- Visible steam curl — OpenArt's image #2 was partial; its other 2 and all 3 SupaVisual images passed
The logo crosses the mug on image #2, making its lettering difficult to verify. That image scored 4.5/6, while every SupaVisual image scored 6/6. I do not discount the successful OpenArt outputs: its total was 16.5/18, and Nano Banana Pro scored 6/6. But a centered watermark affects the product even when the scene details pass.
Details 4–6: rosemary, rain, and reflective slate
SupaVisual image #3 shows the correctly lettered mug, exactly 3 beans, steam, rosemary, raindrops, and wet slate reflections.
The remaining 3 details did not separate the results.
- Rosemary on the left — OpenArt passed 3 of 3; SupaVisual passed 3 of 3
- Raindrops on the blurred window — Both passed 3 of 3
- Wet slate with reflections — Both passed 3 of 3
OpenArt's image #1 and Nano Banana Pro image passed all 6 checks, as did each of SupaVisual's 3 images. Neither rosemary, rain, nor slate settles this purchase: the overall scores were 16.5/18 and 18/18. In practical picture quality, I call that close; I would decide by the bill, watermark, downloaded file, and commercial-use terms.
The tally: OpenArt 16.5/18 vs SupaVisual 18/18
OpenArt Nano Banana Pro and SupaVisual image #3 shown side by side with all 6 requested scene details.
The tally is straightforward:
- OpenArt GPT Image 2 image #1 — 6/6 · 5 credits · 21.3 seconds
- OpenArt GPT Image 2 image #2 — 4.5/6 · 5 credits · 20.3 seconds
- OpenArt Nano Banana Pro image #3 — 6/6 · 40 credits · 26.9 seconds
- SupaVisual image #1 — 6/6 · 1 credit · 48.7 seconds
- SupaVisual image #2 — 6/6 · 1 credit · 38.7 seconds
- SupaVisual image #3 — 6/6 · 1 credit · 53.8 seconds
At 16.5/18 against 18/18, I call picture quality a practical tie. OpenArt was 2.3× faster with GPT Image 2 and 1.8× faster with Nano Banana Pro; SupaVisual had 0 of 3 downloads watermarked.
The watermark sits on the mug
OpenArt image #1 shows the logo burned into the center of the downloaded image.
OpenArt's logo was burned into the center of all 3 downloaded images. It was in the pixels, not a page overlay; cropping away the center would also remove part of the requested scene.
None of SupaVisual's 3 downloads had a watermark. For this commercial product still, that matters more to me than its 1.5-point checklist lead. The Free account produced attractive pictures but not clean downloads or commercial-use rights.
Price per image: where OpenArt is cheaper
OpenArt's monthly pricing screen shows the paid plan cards and their credit allowances.
For commercial-use pricing, I compared OpenArt Plus ($34 / 12,000 credits) with SupaVisual Hobbyist ($19 / 800 credits). Free and Starter do not include commercial-use rights on OpenArt; Hobbyist does on SupaVisual. GPT Image 2 charged 5 credits per image, Nano Banana Pro 40, and SupaVisual 1.
GPT Image 2 is the row SupaVisual loses: $0.014 against $0.024 per image, or 1.69× as much on Hobbyist. Plus also allows 2,400 GPT Image 2 images per month against 800 on Hobbyist.
- GPT Image 2 image price — OpenArt $0.014 · SupaVisual $0.024 · OpenArt is cheaper by 1.69×
- Nano Banana Pro image price — OpenArt $0.11 · SupaVisual $0.024 · OpenArt costs 4.76× as much
- Monthly image allowance — OpenArt GPT Image 2 2,400 · SupaVisual 800 · OpenArt allows 3× as many images
- Commercial plan price — OpenArt Plus $34 · SupaVisual Hobbyist $19 · SupaVisual costs $15 less per month
I would not claim SupaVisual is cheaper per image across the board. GPT Image 2 wins that price and the stopwatch; Nano Banana Pro costs $0.11 per image. My downloaded OpenArt files were WEBP and watermarked because I tested Free, so I would not treat those files as evidence of what a paid export looks like. The 16.5/18 versus 18/18 checklist, file format, and license terms still belong in the decision.
Speed: OpenArt wins the stopwatch
OpenArt GPT Image 2's result screen shows the image delivered after 21.3 seconds.
I timed Generate to result on screen. OpenArt's GPT Image 2 took 21.3 and 20.3 seconds; the stated comparison is 20.8 seconds against 48.7 for SupaVisual. That is a 2.3× speed win, paired with a $0.014 versus $0.024 per-image price win.
Nano Banana Pro took 26.9 seconds against 48.7 seconds: another OpenArt win, this time by 1.8×. But at $0.11 versus $0.024 per image, that faster option costs 4.76× as much on the compared plans. SupaVisual's slower image generation is a genuine drawback; which speed is worth paying for depends on the model selected.
What I actually downloaded
SupaVisual image #1 is a 1672×941 PNG weighing 2.12 MB.
I inspected the downloaded files, not just their previews.
- OpenArt output sizes — 1792×1008 and 1376×768 WEBP · 0.12–0.26 MB · 0.08–0.17 seconds on 12 Mbps 4G
- SupaVisual output size — 1672×941 PNG · 2.12–2.32 MB · 1.41–1.55 seconds on 12 Mbps 4G
- Watermarked downloads — OpenArt 3 of 3 · SupaVisual 0 of 3 · centered logo only on the former
The smaller WEBP files download faster, but the PNGs leave the product unobstructed. For this listing, I would accept the larger 2.12–2.32 MB files rather than a centered mark on the mug.
Workflow side by side: balance, generation, result
SupaVisual's generation screen shows the image job in progress with a 13-credit balance.
OpenArt's generation screen shows the GPT Image 2 job after the balance moved from 40 to 35 credits.
The balances moved from 13 to 12 for a SupaVisual image and from 40 to 35 for an OpenArt GPT Image 2 image: 1 credit versus 5. On the compared commercial-use plans, those actions cost $0.024 and $0.014, respectively.
Editing changes the calculation. OpenArt's Seedream 5.0 Pro edit charged 30 credits—the allowance for 6 GPT Image 2 images. Its Nano Banana Pro edit charged 40 credits, or 8 such images. SupaVisual charged 1 credit for an edit, the same as an image. I examine the edit results in the next article.
Final verdict: OpenArt scores 60/100 for six-detail coffee-mug images
OpenArt's preview shows the GPT Image 2 coffee-mug result at 1792×1008.
OpenArt deserves its speed win: GPT Image 2 took 20.8 seconds against 48.7 for SupaVisual and cost $0.014 against $0.024 per image. Nano Banana Pro was also faster at 26.9 against 48.7 seconds, though its image price was $0.11.
The Free-account downloads put a centered logo in 3 of 3 files, and one result scored 4.5/6. SupaVisual scored 6/6 on each image and supplied watermark-free PNGs. With picture quality close at 16.5/18 against 18/18, I favor the clean file and Hobbyist's $19 commercial-use plan over the faster Free-account result. OpenArt wins the stopwatch; SupaVisual wins my finished-asset test.
Which one I would use for this job
SupaVisual's preview shows image #1 with the mug, lettering, steam, beans, rosemary, rain, and reflective slate.
For this commercial coffee-mug image, I would use SupaVisual. It charged 1 credit, scored 6/6 on each of 3 images, and returned watermark-free PNGs. OpenArt's GPT Image 2 was faster at 20.8 versus 48.7 seconds and cheaper at $0.014 versus $0.024 per image, but its Free-account downloads had a centered logo in 3 of 3 files.
Hobbyist costs $19 for 800 credits and includes commercial use; OpenArt Plus costs $34 for 12,000 credits and includes commercial use. GPT Image 2 remains the cheaper per-image choice. For the clean file I want here, the product page is https://supavisual.com.
Originally published on Medium: OpenArt AI Image Generator Review 2026: Coffee Mug, 3 of 3 Watermarked.