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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 | Pixlr | Switch / compare |
|---|---|---|---|
| Background removal | Not tested in topic | 68/100 2048 × 2048 · PNG | Compare in task topic → |
| Image upscaling | 89/100 2048 × 2048 · PNG | 88/100 2048×2048 (PNG · 4.0x Super Scale) · Historical description; output not attached | Active task |
| Object removal | Not tested in topic | 90/100 2048×2048 (Native Full-Res No Watermark PNG/JPG/WebP) · Historical description; output not attached | Compare in task topic → |
| Image generation | Not tested in topic | 92/100 1024×1024 (Unwatermarked PNG, 1.38MB) · Historical description; output not attached | Compare in task topic → |
| Photo restoration | Not tested in topic | 69/100 JPEG · 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 | Pixlr Express (Super Scale AI) Image upscaling 88/100 Seven-aspect task score 4× watermark-free export is fast with clear per-use credits, but free saves are limited to three per day and multiple video ads occupy the workspace. Tested export 2048×2048 (PNG · 4.0x Super Scale) · Historical description; output not attached Historical test · 2026-10-16 |
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| 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 ↗ | All web monthly/annual tiers and five credit top-up packs · 2026-10-20 Plan · source date Monthly / one-time Annual bill / period Quota & limits Plus2026-10-20 ↗ USD 2.49/month USD 23.88/year Monthly 80 AI credits/month; not a dedicated removal count Rules [1] Annual 960 general AI credits/year, valid for one year Rules [2] Premium2026-10-20 ↗ USD 9.99/month USD 95.88/year Monthly 1,000 AI credits/month; not a dedicated removal count Rules [1] Annual 12,000 general AI credits/year, valid for one year Rules [2] Ultra regular2026-10-20 ↗ USD 24.99/month USD 239.9/year Monthly 5,000 AI credits/month; not a dedicated removal count Rules [1] Annual 60,000 general AI credits/year, valid for one year Rules [2] Ultra MAX2026-10-20 ↗ USD 49.99/month USD 479.9/year Monthly 10,000 AI credits/month; not a dedicated removal count Rules [1] Annual 120,000 general AI credits/year, valid for one year Rules [2] 200 AI credits2026-10-20 ↗ USD 3.99 · one-time payment Usage / one-time Usage / one-time 200 general AI credits; pack expiry not separately verified 500 AI credits2026-10-20 ↗ USD 6.99 · one-time payment Usage / one-time Usage / one-time 500 general AI credits; pack expiry not separately verified 1,000 AI credits2026-10-20 ↗ USD 9.99 · one-time payment Usage / one-time Usage / one-time 1,000 general AI credits; pack expiry not separately verified 2,000 AI credits2026-10-20 ↗ USD 16.99 · one-time payment Usage / one-time Usage / one-time 2,000 general AI credits; pack expiry not separately verified 5,000 AI credits2026-10-20 ↗ USD 30.99 · one-time payment Usage / one-time Usage / one-time 5,000 general AI credits; pack expiry not separately verified 13 plan / billing-period records, all listed; — means that period is not recorded. All four annual charges were confirmed at checkout. Ultra $239.90/year and Ultra MAX $479.90/year differ from rounded monthly equivalents multiplied by 12. The feature FAQ advertises free removal and batch ZIP export without quantifying free counts/limits. Removal credit conversion and top-up expiry are not separately stated in reviewed pages. Tax depends on billing address. Verification has gaps; unknown prices and quotas are not inferred. Cancellation, sources & verification recordPage states cancellation is available anytime; refund details unverified. Official plans and usage terms ↗ · 2026-10-20 Capture 1 ↗ · Capture 2 ↗ · Capture 3 ↗ Official annual checkout summaries for all four plans ↗ · 2026-10-20 Capture 1 ↗ · Capture 2 ↗ · Capture 3 ↗ · Capture 4 ↗ Official free removal and batch explanation ↗ · 2026-10-20 Capture 1 ↗ |
| Free & trial allowance on the test date | Unlimited local WebGPU runs with zero daily caps or credit deductions | 50 free initial AI credits upon signup; Super Scale (2x/4x/8x) costs only 1 credit per upscale, with 3 free daily saves |
| Cancellation & refunds | Completely free open-source-powered tool with no accounts or subscription charges. | Page states cancellation is available anytime; refund details unverified. |
| Disclosure of costs & limits | Explicitly discloses WebGPU browser requirements and model options at the top of the page | Super Scale panel clearly labels 'Scale up (1c)' and 25MP (5000×5000) max limit; right sidebar displays video ads |
| Task quality | ||
| Measured fixture results | Tested scale: 4× | Tested scale: 4× |
| Fixture findings | Ran 4× upscaling locally with noise reduction and text retention; speed depends on the device. | The tested 4× output was watermark-free with clear main lettering; inspect small text and other images separately. |
| 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. | PSNR=26.95dB · SSIM=0.8846 (native 4x 2048×2048 unwatermarked PNG export); Edge gradient correlation edge_corr=0.6141 (+4.85% over Bicubic); high-frequency recovery hf_ratio=0.4636; Calibration plate PSNR=15.56dB: clean 'REALTEST 2026' wood sign and smooth natural brass surface rendering. |
| 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 4x/8x high-resolution upscaling (up to 5000×5000px) combined with multi-layer canvas editing |
| Result & output evidence | No native output obtained; the preview does not establish final export quality. | |
| Delivery capabilities | ||
| Recorded export specifications | 2048 × 2048 · PNG · No watermark in test | 2048×2048 (PNG · 4.0x Super Scale) · Historical description; output not attached · Check watermark record No native output is attached; check the evidence for specification and watermark claims. |
| Historical specification note · not an official maximum | 2048 × 2048 (true 4x lossless PNG export, supporting arbitrary large-image tiled inference) | 2048×2048 (PNG · 4.0x Super Scale) |
| Watermark observation | Watermark-free | No watermark |
| Batch & API | Supports multi-model switching (Swin-UNet Art / Art Scan / Photo), 4-level denoise, and configurable tile size | Supports chained 2x/4x/8x upscaling up to 5000×5000px (25MP) and multi-layer editing |
| Recorded free-tier dimensions | 2048 × 2048 | Not verified |
| Attached file dimensions | 2048 × 2048 · PNG | Not verified |
| Speed & reliability | ||
| Timing observation | Recorded local processing time: 2.63s · End-to-end reference: 2.63s | Network-observed server wait: 3.4s · End-to-end reference: 3.85s |
| Date & fixture | 2026-10-17 · anchor_upscale_v1 · US-West (California, AS2914) | 2026-10-16 · 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) | Free login via Google, Apple, Facebook, or Email |
| 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. | Displays third-party video ads along the right sidebar on the free tier and caps free local saves at 3 per day. |
| Background & reputation | ||
| Service lifecycle notice | Not verified | Not verified |
| Operator | nagadomi (waifu2x / nunif Open-Source Author) | Pixlr Pte. Ltd. (Inmagine Group / 123RF) |
| Recorded origin | Independent open-source AI vision researcher (Japan) | Singapore |
| Domain history record | 2015–Present (waifu2x.net) | 2008–Present |
| Background & reputation assessment | Authored and maintained by nagadomi, the creator of the iconic Waifu2x open-source repository and the nunif deep-learning framework. | 18-year veteran photo suite operated by Singapore's Inmagine Group (123RF), with Plus plans starting at $1.99/mo. |
| External reputation record | Not verified | Not verified |
| Engineering & privacy | ||
| Processing location | On-device processing | Uploaded for cloud processing |
| Third-party tracking record | Not verified | Not verified |
| Engineering & privacy assessment | 100% local in-browser WebGPU / ONNX Runtime inference — user images never leave the local device, offering maximum privacy protection. | 4x (2048×2048) upscale completed in ~3.40s and exported a 3.1MB lossless PNG (also supports JPG, WebP, PDF, PXZ). |
| 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). | 29 / 35 Exceptionally fair credit pricing: whether you choose 2x (1024px), 4x (2048px), or 8x (4096px), Super Scale costs just 1 AI credit ('Scale up 1c') out of 50 free signup credits. |
| 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. | 22 / 30 Displays third-party video ads along the right sidebar on the free tier and caps free local saves at 3 per day. |
| Background & reputation | 19 / 20 Authored and maintained by nagadomi, the creator of the iconic Waifu2x open-source repository and the nunif deep-learning framework. | 18 / 20 18-year veteran photo suite operated by Singapore's Inmagine Group (123RF), with Plus plans starting at $1.99/mo. |
| Engineering & privacy | 14.5 / 15 100% local in-browser WebGPU / ONNX Runtime inference — user images never leave the local device, offering maximum privacy protection. | 14 / 15 4x (2048×2048) upscale completed in ~3.40s and exported a 3.1MB lossless PNG (also supports JPG, WebP, PDF, PXZ). |
| 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 | 56.5 / 65 PSNR vs 2048px GT: 26.95 dB · SSIM: 0.8846 · Edge Gradient Correlation: 0.6141 · High-Freq Sharpness Ratio: 0.4636 · Calibration Plate PSNR: 15.56 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) | 20 / 20 Clean unwatermarked export (8/8); Free scale factor: 4x (2048×2048 (PNG · 4.0x Super Scale)) |
| 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) | 14 / 15 Network-observed server wait: 3.4s (API mode: sync_post; end-to-end 3.85s shown for reference only, never penalized) |
