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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 | Krea | Switch / compare |
|---|---|---|---|
| Background removal | Not tested in topic | 84/100 2048 × 2048 · PNG | Compare in task topic → |
| Image upscaling | 89/100 2048 × 2048 · PNG | 71/100 1024×1024 (PNG · 2.0x Generative Enhance) · Historical description; output not attached | Active task |
| Object removal | Not tested in topic | 91/100 2048×2048 (Native full-resolution watermark-free PNG) · Historical description; output not attached | Compare in task topic → |
| Image generation | Not tested in topic | 93/100 2048 × 2048 · PNG | 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 | Krea AI (Krea Enhance) Image upscaling 71/100 Seven-aspect task score Free compute can enhance textures, but login, repeated onboarding promotions and a long queue add friction; rewritten small text limits fidelity-sensitive work. Tested export 1024×1024 (PNG · 2.0x Generative Enhance) · 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 ↗ | Individual web plans and default Business 80k volume; excludes API and other business volumes · 2026-10-20 Plan · source date Monthly / one-time Annual bill / period Quota & limits Basic2026-10-20 ↗ USD 9/month USD 63/year Monthly 5,000 general compute units/month; not removal counts Annual 5,000 general compute units/month Observed first-year promotion USD 63; then USD 84/year until cancelled Rules [1]Pro2026-10-20 ↗ USD 35/month USD 252/year Monthly 20,000 general compute units/month; not removal counts Annual 20,000 general compute units/month Observed first-year promotion USD 252; then USD 336/year until cancelled Rules [1]Max 60k2026-10-20 ↗ USD 105/month USD 756/year Monthly 60,000 general compute units/month; not removal counts Annual 60,000 general compute units/month Observed first-year promotion USD 756; then USD 1008/year until cancelled Rules [1]Business 80k2026-10-20 ↗ USD 200/month USD 1,920/year Monthly 80,000 general compute units/month; not removal counts Annual 80,000 general compute units/month Max 40k2026-10-20 ↗ USD 70/month USD 504/year Annual 40,000 general compute units/month Observed first-year promotion USD 504; then USD 672/year until cancelled Rules [1]Monthly 40,000 general compute units/month Max 80k2026-10-20 ↗ USD 135/month USD 972/year Annual 80,000 general compute units/month Observed first-year promotion USD 972; then USD 1296/year until cancelled Rules [1]Monthly 80,000 general compute units/month Max 100k2026-10-20 ↗ USD 165/month USD 1,188/year Annual 100,000 general compute units/month Observed first-year promotion USD 1188; then USD 1584/year until cancelled Rules [1]Monthly 100,000 general compute units/month Enterprise2026-10-20 ↗ Contact sales Quoted Quoted Custom enterprise support, security and administration 16 plan / billing-period records, all listed; — means that period is not recorded. All 10 previously missing amounts are confirmed in USD checkout summaries. Individual annual offers separate first-year and renewal charges; Business 80k is $1,920/year. Max monthly purchase paths show additional annual offers whose checkout totals were not independently confirmed; these are not merged with the default annual offer. Per-removal compute cost and extra top-up pricing are not separately specified in the verified plans/checkouts. Other Business volumes are outside scope. Verification has gaps; unknown prices and quotas are not inferred. Cancellation, sources & verification recordSelf-serve cancellation in account settings Official plans and usage terms ↗ · 2026-10-20 Capture 1 ↗ USD checkout summaries reached from official pricing ↗ · 2026-10-20 Capture 1 ↗ · Capture 2 ↗ · Capture 3 ↗ · Capture 4 ↗ · Capture 5 ↗ · Capture 6 ↗ · Capture 7 ↗ · Capture 8 ↗ · Capture 9 ↗ · Capture 10 ↗ Additional annual offers on monthly purchase paths ↗ · 2026-10-20 Capture 1 ↗ · Capture 2 ↗ · Capture 3 ↗ |
| Free & trial allowance on the test date | Unlimited local WebGPU runs with zero daily caps or credit deductions | 50 free daily compute credits (~6–7 free 2x enhancements/day); free tier is capped at 1 concurrent job with queue wait, and 8x/16x require a paid subscription |
| Cancellation & refunds | Completely free open-source-powered tool with no accounts or subscription charges. | Self-serve cancellation in account settings |
| Disclosure of costs & limits | Explicitly discloses WebGPU browser requirements and model options at the top of the page | Prompts signup upon clicking Generate and clearly marks 8x/16x as 'For paid users only' inside the workspace |
| 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. | Enhanced texture but rewrote small text in this fixture; take care when exact lettering matters. |
| 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=23.64dB · SSIM=0.7771 (2x 1024×1024 unwatermarked PNG); high hf_ratio=0.6486 makes the 'REALTEST 2026' wooden sign and brass robot look ultra-detailed, but because Krea uses a generative diffusion model (realisticv51, denoising=0.4), the small bottom-right calibration plate text 'REALTEST 2048px GT' is hallucinated into 'AFAL I SOT 20110pss OT' (plate_psnr=14.30dB). |
| 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 | Creators seeking 'Generative Upscaling' to hallucinate rich surface textures on AI art or portraits—not suitable for document or micro-text fidelity |
| 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 | 1024×1024 (PNG · 2.0x Generative Enhance) · 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) | 1024×1024 (2.0x · Free tier unlocks 2x/4x; 8x/16x require paid plan) |
| Watermark observation | Watermark-free | 100% Watermark-Free |
| Batch & API | Supports multi-model switching (Swin-UNet Art / Art Scan / Photo), 4-level denoise, and configurable tile size | Paid plans unlock multi-job concurrency and up to 16x upscaling; free tier is limited to 1 concurrent job |
| 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: 8.61s · End-to-end reference: 87.81s |
| 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) | Clicking Generate on the landing page requires Google / Apple / Email sign-in |
| 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. | Post-signup `/onboarding` triggers two consecutive discount retention modals when clicking 'Skip': first a 1-hour countdown modal ('Take Pro at 40% off instead... Offer ends in 0h:59m:57s'), followed by a 'Final chance — Are you sure you don't want this offer?' modal when dismissing the bottom bar (Screenshot ④); once inside `/enhancer`, the workspace is clean. |
| Background & reputation | ||
| Service lifecycle notice | Not verified | Not verified |
| Operator | nagadomi (waifu2x / nunif Open-Source Author) | Krea AI Inc. (San Francisco, CA, USA) |
| Recorded origin | Independent open-source AI vision researcher (Japan) | San Francisco, USA |
| Domain history record | 2015–Present (waifu2x.net) | 2022–Present |
| Background & reputation assessment | Authored and maintained by nagadomi, the creator of the iconic Waifu2x open-source repository and the nunif deep-learning framework. | Developed by Krea AI Inc. (San Francisco, CA, founded by Victor Perez & Diego Rodriguez, backed by Andreessen Horowitz & Bain Capital Ventures). |
| 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. | Uses an async GPU job queue (`/api/job-status` reports exact `time_in_gen_server: 8.61s` and `t_inference: 4.57s`) with encrypted CDN delivery (`gen.krea.ai`). |
| 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). | 24 / 35 Landing page `/apps/enhance` (Screenshot ①) provides an upload box and 1x/2x/4x/8x buttons, prompting 'Sign up for 50 free credits daily' when clicking Generate; after free Google sign-in, Krea grants daily free compute credits and exports 100% watermark-free 1024×1024 (2x) PNGs (8x and 16x are clearly labeled 'For paid users only'). |
| 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. | 18 / 30 Post-signup `/onboarding` triggers two consecutive discount retention modals when clicking 'Skip': first a 1-hour countdown modal ('Take Pro at 40% off instead... Offer ends in 0h:59m:57s'), followed by a 'Final chance — Are you sure you don't want this offer?' modal when dismissing the bottom bar (Screenshot ④); once inside `/enhancer`, the workspace is clean. |
| Background & reputation | 19 / 20 Authored and maintained by nagadomi, the creator of the iconic Waifu2x open-source repository and the nunif deep-learning framework. | 19 / 20 Developed by Krea AI Inc. (San Francisco, CA, founded by Victor Perez & Diego Rodriguez, backed by Andreessen Horowitz & Bain Capital Ventures). |
| 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 / 15 Uses an async GPU job queue (`/api/job-status` reports exact `time_in_gen_server: 8.61s` and `t_inference: 4.57s`) with encrypted CDN delivery (`gen.krea.ai`). |
| 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 | 45 / 65 PSNR vs 2048px GT: 23.64 dB · SSIM: 0.7771 · Edge Gradient Correlation: 0.4812 · High-Freq Sharpness Ratio: 0.6486 · Calibration Plate PSNR: 14.3 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) | 15 / 20 No free unwatermarked export (0/8); Free scale factor: 2x (1024×1024 (2.0x · Free tier unlocks 2x/4x; 8x/16x require paid plan)) |
| 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) | 9.5 / 15 Network-observed server wait: 8.61s (API mode: async_poll; end-to-end 87.81s shown for reference only, never penalized) |
