Comparison

Fluid Simulation vs Duo Wallpaper

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Fluid Simulation

Read full description

Art you can touch. LIQUIDTOUCH is an art app for iPhone and iPad that lets you explore light, liquids, metal and geometry through taps and drags. Tap to send ripples across the screen. Drag to change what you see. When you want to move your fingers without thinking or take a break, enjoy a little time with art at your own pace. • Find your favorite among 45 artworks Ripples of light, the clarity of glass, undulating metal, color set loose in water, scenery rushing past. Five styles, each with a feel of its own. • Tap, drag and hold Art responds to where and how you touch. Hold to speed up the motion and repeat effects in supported artworks. Feel haptic feedback on supported devices. • Save and share the motion Record a 3-second Live Photo, a 4K image or a video of up to 60 seconds while interacting with an artwork. Save it to Photos or send it through the system share sheet. Videos are saved in portrait Full HD. On compatible iPhones, Live Photos can be set as Lock Screen wallpapers through iOS. Playback depends on the device, iOS version and photo eligibility. This is not a continuously animated Home Screen wallpaper feature. • Listen Mode responds to sound Turn on Listen Mode to make art respond to sounds around you. The microphone is used when you enable this feature. Microphone audio is not recorded in exported videos. • Enjoy a bigger canvas Enjoy LIQUIDTOUCH on iPad, or display art on a larger screen when connected to a compatible external display. • Try every artwork first The first-launch guide lets you touch every artwork before you choose a plan. Access to the artworks is offered with a weekly or yearly auto-renewing subscription. The yearly plan includes a free trial for eligible new subscribers. See the purchase screen for prices and available offers. Weekly and yearly plans renew automatically unless canceled at least 24 hours before the current period ends. Payment is charged to your Apple Account. Manage or cancel subscriptions in your Apple Account subscription settings. Restore previous purchases using Restore Purchases in the app. Terms of Use (Apple Standard EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

Duo Wallpaper

Features
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Duo Wallpaper — not just a wallpaper library, but an AI wallpaper studio: type an idea or upload any image you like, and AI turns it into your own wallpaper, up to 4K. Built for the iPhone Duo foldable — portrait wallpaper for the outer display, landscape for the inner display, applied as a matched set in one tap. Also great on any iPhone or iPad. 【AI-Generated Wallpapers】DuoWallpaper · Describe an idea in one sentence, pick a ratio and quality, and AI generates your wallpaper in up to 4K · Image-to-image: upload any picture you like and AI reimagines it as your own foldable wallpaper · 21 art styles: ink wash, oil painting, cyberpunk, 3D render, anime and more · Device-aware: automatically matches the best resolution for foldable inner/outer screens, iPhone and iPad 【Made for the iPhone Duo】 Outer display portrait + inner display landscape, one complete set, layout adapts automatically as you fold and unfold. 【Curated Library】 Hand-picked wallpapers across landscape, anime, minimal, dark, healing and more — clearly organized, easy to find. 【Daily Updates】 New picks every day, plus charts and editor collections. 【Live Photo Wallpapers】 Live Photo wallpapers that move right on your Lock Screen. 【Video ↔ Live Photo Converter】 Turn videos into Live Photos in one tap, and Live Photos back into videos — your moments, both ways. 【Home Screen Widgets】 Daily picks, charts and collections right on your Home Screen. 【Membership】 Part of the content is free. Membership unlocks all wallpapers and Live Photos: · Monthly / Yearly / Lifetime · Auto-renews within 24 hours before the period ends; manage or cancel anytime in your App Store account settings 【Privacy & Convenience】 · Sign in with Apple supported · Favorites, downloads and history in one place · 10 languages supported Download DuoWallpaper now — let AI light up both of your screens! Privacy Policy: https://www.duowallpaper.cn/agreements/en/privacy-policy.html Terms of Use: https://www.duowallpaper.cn/agreements/en/user-agreement.html Membership & Auto-Renewal: https://www.duowallpaper.cn/agreements/en/membership-purchase-agreement.html

Screenshots

Fluid Simulation4 screens
Duo Wallpaper4 screens

Verdict

The call

Fluid Simulation and Duo Wallpaper are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Fluid Simulation sells 5 in-app purchases, starting at $1.99 per 7 days and Duo Wallpaper sells 7 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 3 days. The most recent releases landed on November 11, 2026 and November 10, 2026 respectively.

ScorecardNo meaningful differences
Fluid Simulation versus Duo Wallpaper: the parameters behind the verdict, then further details
ParameterFluid SimulationDuo Wallpaper
PriceFreeFree
Rating1.0 (1 ratings) — better—
Positive reviews0.0% of reviews—
Number of ratings1 — better—
Update frequencyEvery 3 daysEvery 3 days
AdsYesYes
In-app purchasesYesYes
DevicesiPhone, iPadiPhone, iPad
Requires iOS17.0 — better18.0
Further details — not scored
Size13 MB32 MB
Age rating4+12+
DeveloperAppnics, LLCwei xiang

In-app purchases

5 purchases

Fluid Simulation

Subscriptions3
  • LIQUIDTOUCH Weekly$1.997 Days
  • LIQUIDTOUCH Monthly$1.991 Month
  • LIQUIDTOUCH Yearly3 Days trial$14.991 Year
One-time2
  • LIQUIDTOUCH Lifetime$19.99
  • LIQUIDTOUCH Lifetime$29.99
7 purchases

Duo Wallpaper

Subscriptions2
  • 月度会员$4.991 Month
  • 年度会员$29.991 Year
One-time5
  • 100 Credits$2.99
  • 260 Credits$4.99
  • 400 Credits$6.99
Show 2 more
  • 700 Credits$9.99
  • Lifetime Pro$59.99

Questions

Is Fluid Simulation free?
Fluid Simulation is free to download, with in-app purchases available.
Is Duo Wallpaper free?
Duo Wallpaper is free to download, with in-app purchases available.
Do Fluid Simulation or Duo Wallpaper have ads?
Both Fluid Simulation and Duo Wallpaper show ads.
Which is updated more often, Fluid Simulation or Duo Wallpaper?
Fluid Simulation ships an update every 3 days, and Duo Wallpaper every 3 days. Most recently, Fluid Simulation was updated on November 11, 2026 and Duo Wallpaper on November 10, 2026.

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