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Test scope & comparison notes
These are recorded facts, not a unified ranking. Tested tiers and scope are not consistently recorded. Read pricing with its date and timing with its conditions. Privacy observations reflect visible flows and statements, not a security audit.
Cross-task capability coverage across selected products
Each product is scored independently per task edge; switch tasks below while keeping shared products selected| Task edge | Unlimited:Waifu2x | seaart.ai | Switch / compare |
|---|---|---|---|
| Background removal | Not tested in topic | 84/100 2048 × 2048 · PNG | Compare in task topic → |
| Image upscaling | 89/100 2048 × 2048 · PNG | 79/100 1024 × 1024 · PNG | Active task |
| Object removal | Not tested in topic | 86/100 2048 × 2048 · PNG | Compare in task topic → |
| Image generation | Not tested in topic | 83/100 WEBP · Output attached | Compare in task topic → |
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Browse this task →| Criterion | Unlimited:Waifu2x (WebGPU In-Browser SR) Image upscaling 89/100 Seven-aspect task score Free open-source, login-free on-device processing gives good 4× detail; a dismissible rewarded-ad prompt may appear on first use. Tested export 2048 × 2048 · PNG Historical test · 2026-10-17 | SeaArt (AI Image Upscaler) Image upscaling 79/100 Seven-aspect task score SeaArt AI Upscaler offers Precise and Creative modes, delivering a clean 1024x1024 watermark-free image (PSNR 26.47 dB, SSIM 0.8810) at 2K. While inference and queue latency took ~80s, structural fidelity and text preservation remain solid, consuming 40 daily free credits. Tested export 1024 × 1024 · PNG Historical test · 2026-11-04 |
|---|---|---|
| Pricing & rules | ||
| Pricing plans | unlimited:waifu2x in-browser AI image upscaler · 2026-10-21 Plan · source date Monthly / one-time Annual bill / period Quota & limits unlimited:waifu2x Free Web2026-10-21 ↗ Free Free Free Free without login and no image-count limits (runs on local WebGPU/WASM hardware); supports up to 4x unwatermarked PNG export. 1 plan / billing-period records, all listed; — means that period is not recorded. In-browser WebGPU/WebAssembly upscaler powered by nunif/waifu2x. Completely free with no account system or paid tiers; offers swin_unet and cunet models, 1x/2x/4x upscaling, and denoise levels running on local device hardware. Cancellation, sources & verification recordCompletely free open-source-powered tool with no accounts or subscription charges. unlimited:waifu2x official page ↗ · 2026-10-21 Capture 1 ↗ | SeaArt.ai Stamina and VIP subscription model · 2026-11-01 Plan · source date Monthly / one-time Annual bill / period Quota & limits Free Tier (Daily Stamina)2026-11-01 ↗ Free Free Free ~150 daily Stamina refreshed every 24 hours Base image generation, upscaling, background removal, and community models；Unused stamina resets daily; standard queue; excludes custom LoRA training；Refreshes daily, no renewal；Perpetual access Standard VIP2026-11-01 ↗ Monthly price not verified — Monthly Higher daily Stamina allowance, bonus coins, and fast-track queues Fast-track generation, concurrent tasks, and commercial licensing；Pricing visible inside account store (typically approx $9.99/mo)；Auto-renews monthly；Active during billing month 2 plan / billing-period records, all listed; — means that period is not recorded. Uses daily regenerating Stamina (~150/day free) plus persistent Coins; paid plans include Standard VIP (~$9.99/mo), Pro (~$29.99/mo), and SVIP tiers detailed within account portals. Verification has gaps; unknown prices and quotas are not inferred. Cancellation, sources & verification recordCancellation and refund terms unverified SeaArt AI Official Homepage and Community ↗ · 2026-11-01 Capture 1 ↗ |
| Free & trial allowance on the test date | Unlimited local WebGPU runs with zero daily caps or credit deductions | Daily login grants Stamina; 2K upscale consumes 40 computing points |
| Cancellation & refunds | Completely free open-source-powered tool with no accounts or subscription charges. | Not verified |
| Disclosure of costs & limits | Explicitly discloses WebGPU browser requirements and model options at the top of the page | Credit consumption disclosed upfront before processing |
| Task quality | ||
| Measured fixture results | Tested scale: 4× | Tested scale: 2× |
| Fixture findings | Ran 4× upscaling locally with noise reduction and text retention; speed depends on the device. | Achieves PSNR 26.47 dB and SSIM 0.8810 under 2K Precise mode, preserving intact REALTEST 2026 text with clean native 1024x1024 watermark-free export. |
| Original historical observation | Waifu2x Unlimited (Swin-UNet Photo 4x) suppresses JPEG compression artifacts cleanly while preserving natural camera gradients (PSNR 28.34 dB, SSIM 0.895) in 2.63s via WebGPU, without introducing fake generative hallucinations. | Plaque spelling REALTEST 2026 is complete and orderly, brass robot torso and ceramic cup highlights are well-preserved, overall PSNR=26.47 dB, SSIM=0.8810. |
| Suitable uses · historical assessment | Privacy-conscious users, anime/illustration and natural photo creators who want 100% free, unlimited 4x local GPU super-resolution without uploading files to any cloud server | Users needing daily 2K super-resolution enhancement with available free Stamina |
| Result & output evidence | ||
| Delivery capabilities | ||
| Recorded export specifications | 2048 × 2048 · PNG · No watermark in test | 1024 × 1024 · PNG · No watermark in test |
| Historical specification note · not an official maximum | 2048 × 2048 (true 4x lossless PNG export, supporting arbitrary large-image tiled inference) | 1024×1024 (PNG · 2.0x Free Tier) |
| Watermark observation | Watermark-free | Completely watermark-free |
| Batch & API | Supports multi-model switching (Swin-UNet Art / Art Scan / Photo), 4-level denoise, and configurable tile size | Supports web interface and API batch calls |
| Recorded free-tier dimensions | 2048 × 2048 | 1024 × 1024 |
| Attached file dimensions | 2048 × 2048 · PNG | 1024 × 1024 · PNG |
| Speed & reliability | ||
| Timing observation | Recorded local processing time: 2.63s · End-to-end reference: 2.63s | Network-observed server wait: 80.66s · End-to-end reference: 80.66s |
| Date & fixture | 2026-10-17 · anchor_upscale_v1 · US-West (California, AS2914) | 2026-11-04 · anchor_upscale_v1 · US-West (California, AS2914) |
| Repeated tests & reliability | No standardized repetition count, success rate or variability range is recorded. | No standardized repetition count, success rate or variability range is recorded. |
| Interaction experience | ||
| Account requirements | No login in this test | Account required in this test |
| Sign-in methods | 100% usable without login (runs entirely in the local browser via WebGPU) | Google / Email Login |
| Manual adjustment | Not verified | Not verified |
| Interaction observations | Pure single-page engineering workbench: select model (Swin-UNet Art / Photo), Denoise level, and 1x/2x/4x scale, then immediately preview or download the 2048×2048 PNG. | Clean dual-mode interface offering Precise and Creative modes across 2K/4K/6K/8K tiers with zero intrusive popups. |
| Background & reputation | ||
| Service lifecycle notice | Not verified | Not verified |
| Operator | nagadomi (waifu2x / nunif Open-Source Author) | STAR CLOUD PTE. LTD. (SeaArt) |
| Recorded origin | Independent open-source AI vision researcher (Japan) | Singapore |
| Domain history record | 2015–Present (waifu2x.net) | 2023–Present |
| Background & reputation assessment | Authored and maintained by nagadomi, the creator of the iconic Waifu2x open-source repository and the nunif deep-learning framework. | Operated by STAR CLOUD PTE. LTD. (Singapore), with an active community, extensive model ecosystem, and sound compliance policies. |
| External reputation record | Not verified | Active global AIGC community with millions of creator-published styles and LoRA assets across mobile and web. |
| Engineering & privacy | ||
| Processing location | On-device processing | Uploaded for cloud processing |
| Third-party tracking record | Not verified | Google Tag Manager · Cloudflare · Stripe |
| Engineering & privacy assessment | 100% local in-browser WebGPU / ONNX Runtime inference — user images never leave the local device, offering maximum privacy protection. | Full HTTPS encryption across all endpoints, providing task management and one-click data deletion. |
| Retention statement | This flow runs locally; post-close deletion not independently verified | Explicit retention period unconfirmed; inspect policy record |
| Evaluation basis | ||
| Pricing transparency | 34 / 35 100% free and open-source in-browser WebGPU tool with zero paywalls, zero ad clutter, and no usage limits (01_landing.png, 02_workspace.png, 03_download.png). | 25 / 35 Dual Stamina consumption system clearly labels the 40-credit cost for 2K upscaling (subscription tiers accessible upon login). Transparency is solid. |
| Interaction restraint | 25 / 30 Pure single-page engineering workbench: select model (Swin-UNet Art / Photo), Denoise level, and 1x/2x/4x scale, then immediately preview or download the 2048×2048 PNG. | 24 / 30 Clean dual-mode interface offering Precise and Creative modes across 2K/4K/6K/8K tiers with zero intrusive popups. |
| Background & reputation | 19 / 20 Authored and maintained by nagadomi, the creator of the iconic Waifu2x open-source repository and the nunif deep-learning framework. | 16 / 20 Operated by STAR CLOUD PTE. LTD. (Singapore), with an active community, extensive model ecosystem, and sound compliance policies. |
| Engineering & privacy | 14.5 / 15 100% local in-browser WebGPU / ONNX Runtime inference — user images never leave the local device, offering maximum privacy protection. | 13.5 / 15 Full HTTPS encryption across all endpoints, providing task management and one-click data deletion. |
| Task quality | 57.2 / 65 PSNR vs 2048px GT: 28.34 dB · SSIM: 0.895 · Edge Gradient Correlation: 0.7165 · High-Freq Sharpness Ratio: 0.5256 · Calibration Plate PSNR: 17 dB | 55 / 65 PSNR vs 2048px GT: 26.47 dB · SSIM: 0.881 · Edge Gradient Correlation: 0.6014 · High-Freq Sharpness Ratio: 0.4547 · Calibration Plate PSNR: 15.23 dB |
| Deliverable specifications | 20 / 20 Exports a full 2048×2048 4x upscaled PNG (or WebP/JPEG) locally in the browser with zero watermarks and no file-count limits (20.0/20) | 18 / 20 No free unwatermarked export (0/8); Free scale factor: 2x (1024×1024 (PNG · 2.0x Free Tier)) |
| Processing speed | 10.5 / 15 Local WebGPU hardware acceleration completes 512→2048 (4x) tiled inference in just 2.63s with zero network upload overhead (14.5/15) | 6.5 / 15 Network-observed server wait: 80.66s (API mode: async_poll; end-to-end 80.66s shown for reference only, never penalized) |
