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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 | Let's Enhance | Switch / compare |
|---|---|---|---|
| Image upscaling | 89/100 2048 × 2048 · PNG | 76/100 2048×2048 (JPG · 4.0x Prime Upscale · Bottom-left watermark) · Historical description; output not attached | Active task |
| Image generation | Not tested in topic | 80/100 2048×2048 (9.96 MB PNG · Bottom-left watermark on free credits) · Historical description; output not 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 | Let's Enhance (Prime 4x Upscaler) Image upscaling 76/100 Seven-aspect task score 4× detail is good and the workspace is ad-free, but registration is required and trial-credit exports still carry a watermark not disclosed before signup. Tested export 2048×2048 (JPG · 4.0x Prime Upscale · Bottom-left watermark) · Historical description; output not attached Historical test · 2026-10-16 |
|---|---|---|
| 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 ↗ | Let’s Enhance personal subscription plans (Free Trial / Starter / Pro / Max); USD · 2026-10-21 Plan · source date Monthly / one-time Annual bill / period Quota & limits Signup free allowance2026-10-21 ↗ Free trial Trial Trial 10 free credits upon signup (1 credit per upscaled image, 2 credits per AI generation; free-credit exports include watermark). Starter Monthly (100 credits)2026-10-21 ↗ USD 12/month — Monthly 100 credits/month (unused credits roll over up to 600 credits); upscaling up to 256 MP, AI art generation, and watermark-free export. Starter Annual (100 credits/mo)2026-10-21 ↗ — Annual price not verified Annual 100 credits/month (accumulate up to 600 credits); card displays USD 9/month equivalent billed annually. Public card displays only the USD 9/month equivalent ("Billed annually") without showing the annual invoice total before login. Pro Monthly (300 credits)2026-10-21 ↗ USD 32/month — Monthly 300 credits/month (unused credits roll over up to 1,800 credits); upscaling up to 350 MP, AI art generation, and watermark-free export. Pro Annual (300 credits/mo)2026-10-21 ↗ — Annual price not verified Annual 300 credits/month (accumulate up to 1,800 credits); card displays USD 24/month equivalent billed annually. Public card displays only the USD 24/month equivalent ("Billed annually") without showing the annual invoice total before login. Max Monthly (500 credits)2026-10-21 ↗ USD 45/month — Monthly 500 credits/month (unused credits roll over up to 3,000 credits); upscaling up to 512 MP, AI art generation, and watermark-free export. Max Annual (500 credits/mo)2026-10-21 ↗ — Annual price not verified Annual 500 credits/month (accumulate up to 3,000 credits); card displays USD 34/month equivalent billed annually. Public card displays only the USD 34/month equivalent ("Billed annually") without showing the annual invoice total before login. 7 plan / billing-period records, all listed; — means that period is not recorded. The official pricing page and FAQ list personal monthly prices: Starter USD 12/month (100 credits/month), Pro USD 32/month (300 credits/month), and Max USD 45/month (500 credits/month), with unused credits rolling over up to 6x the monthly allowance. Annual cards display only monthly equivalents (USD 9 / 24 / 34 per month, "Billed annually") without printing the annual invoice total on the public page, so annual totals are marked unverified. Verification has gaps; unknown prices and quotas are not inferred. Cancellation, sources & verification recordCancel anytime via the Cancel Subscription button on the Pricing page; remaining unused credits expire at the end of the paid billing period. Purchasing any plan or bundle unlocks watermark-free downloads for previously processed images. Let’s Enhance official pricing and credit rules FAQ ↗ · 2026-10-21 Capture 1 ↗ |
| Free & trial allowance on the test date | Unlimited local WebGPU runs with zero daily caps or credit deductions | New accounts receive 10 free credits (1 credit per upscale; 9 credits left after test); removing the watermark and unlocking 8x/16x require a paid subscription |
| Cancellation & refunds | Completely free open-source-powered tool with no accounts or subscription charges. | Cancel anytime via the Cancel Subscription button on the Pricing page; remaining unused credits expire at the end of the paid billing period. Purchasing any plan or bundle unlocks watermark-free downloads for previously processed images. |
| Disclosure of costs & limits | Explicitly discloses WebGPU browser requirements and model options at the top of the page | Watermark appears only on the generated thumbnail and downloaded file after signup and processing |
| 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. | Text was clear in this 4× output; the free-credit image carried a brand watermark. |
| 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=27.02dB · SSIM=0.8631 (4x 2048×2048 Prime model); outstanding edge_corr=0.7108, hf_ratio=0.7910, and plate_psnr=17.25dB with razor-sharp 'REALTEST 2026' and 'REALTEST 2048px GT' typography, though free-credit exports include a bottom-left Let's Enhance watermark. |
| 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 | Print and design professionals who need ultra-crisp 4x–16x texture restoration and are willing to subscribe to remove the watermark |
| 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 (JPG · 4.0x Prime Upscale · Bottom-left watermark) · 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 (4.0x · Free tier unlocks 1x/2x/4x; 8x/16x require paid plan) |
| Watermark observation | Watermark-free | Free-credit exports carry a semi-transparent 'Let's Enhance .io' logo in the bottom-left corner |
| Batch & API | Supports multi-model switching (Swin-UNet Art / Art Scan / Photo), 4-level denoise, and configurable tile size | Supports multi-image batch queues (up to 50MB/file) and enterprise Claid.ai API |
| 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: 20.1s · End-to-end reference: 22.2s |
| 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) | Mandatory Google or Email registration at /signup after selecting a file |
| 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. | Uses an 'upload-first, signup-gate-second' funnel, though it preserves the uploaded image in the `/boost` queue after login; workspace is clean and ad-free. |
| Background & reputation | ||
| Service lifecycle notice | Not verified | Not verified |
| Operator | nagadomi (waifu2x / nunif Open-Source Author) | Let's Enhance Inc. (San Francisco, CA, USA) |
| Recorded origin | Independent open-source AI vision researcher (Japan) | San Francisco, USA (Ukrainian-founded team) |
| Domain history record | 2015–Present (waifu2x.net) | 2017–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 Let's Enhance Inc. (founded 2017, San Francisco, CA, Techstars alum), one of the earliest commercial deep-learning super-resolution platforms. |
| 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. | Provides multi-model SR controls (Prime, Gentle, Old photo, Light AI) and 1x–16x scale factors over a stable cloud queue. |
| 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). | 18 / 35 The home page (Screenshot ①) presents a drag-and-drop uploader that immediately redirects to `/signup` promising 'Get started with 10 images free' (Screenshot ④); signing in via Google grants 10 credits and unlocks Prime 4x (2048×2048), but the exported 2048×2048 JPG embeds a semi-transparent 'Let's Enhance .io' watermark in the bottom-left corner (Screenshot ③) that was not disclosed on the signup page. |
| 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. | 21 / 30 Uses an 'upload-first, signup-gate-second' funnel, though it preserves the uploaded image in the `/boost` queue after login; workspace is clean and ad-free. |
| 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 Operated by Let's Enhance Inc. (founded 2017, San Francisco, CA, Techstars alum), one of the earliest commercial deep-learning super-resolution platforms. |
| 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 Provides multi-model SR controls (Prime, Gentle, Old photo, Light AI) and 1x–16x scale factors over a stable cloud queue. |
| 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 | 59 / 65 PSNR vs 2048px GT: 27.02 dB · SSIM: 0.8631 · Edge Gradient Correlation: 0.7108 · High-Freq Sharpness Ratio: 0.791 · Calibration Plate PSNR: 17.25 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) | 12 / 20 No free unwatermarked export (0/8); Free scale factor: 4x (2048×2048 (4.0x · Free tier unlocks 1x/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) | 8 / 15 Network-observed server wait: 20.1s (API mode: async_poll; end-to-end 22.2s shown for reference only, never penalized) |
