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The Best Web Launches of the Week

Honoring the most useful developer tools, calculators, indie blogs, and interactive web gems saved and reviewed by the community.

🏆 Creator Reward: Top 3 weekly winners earn a 7-Day Homepage Featured Spot + Permanent Winner Trophy Badge. Resets every Sunday at 23:59 UTC.
🔥 This Week (2026-W46) 🆕 Newest Launches 🏛️ Past Winners / Hall of Fame
#1
Bend This Solid Rock in Your Hands and It Flexes Like Leather—Plus the 2-Teaspoon Saltwater Trick That Floats Real Amber: Flexible "Itacolumite" Sandstone, Elastic Mica &...
Bend This Solid Rock in Your Hands and It Flexes Like Leather—Plus the 2-Teaspoon Saltwater Trick That Floats Real Amber: Flexible "Itacolumite" Sandstone, Elastic Mica &... Minerals & Gemology Interactive Labs
Why does solid Itacolumite quartz sandstone bend up and down like shoe leather in your hands without breaking? How does 2 teaspoons of salt in water float real Baltic Amber (SG 1.08) while fake Bakelite and glass sink? Test 8 flexible, floating & singing crystals in 60FPS.
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#2
Put One Drop of Water on This Blue Crystal and It Flashes Neon Purple-Red: Covellite's "Sub-1.0" Refractive Index Trick, Oregon Copper Sunstone vs. Fake Goldstone & Backlit...
Put One Drop of Water on This Blue Crystal and It Flashes Neon Purple-Red: Covellite's "Sub-1.0" Refractive Index Trick, Oregon Copper Sunstone vs. Fake Goldstone & Backlit... Minerals & Gemology Interactive Labs
Why does indigo-blue Covellite (CuS) instantly flash neon magenta-purple and blood red when touched with a drop of water or alcohol? Explore Covellite's sub-1.0 refractive index (n = 0.85), Oregon Copper Sunstone vs. fake Goldstone glass, backlit Star Rose Quartz diasterism & 2026 IMA copper minerals in 60FPS.
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#3
90% of "Citrine" Is Actually Purple Amethyst Baked in an Oven at 470°C—And This Yellow Crystal Crackles in Your Warm Hand: Spot "Crispy Amethyst" & 8 Heat-Sensitive Minerals
90% of "Citrine" Is Actually Purple Amethyst Baked in an Oven at 470°C—And This Yellow Crystal Crackles in Your Warm Hand: Spot "Crispy Amethyst" & 8 Heat-Sensitive Minerals Minerals & Gemology Interactive Labs
Why is 90% of 'Citrine' sold in rock shops actually purple Amethyst baked in a kiln at 470°C ('Crispy Amethyst')? Why does yellow Native Sulfur crackle audibly when held in your warm 37°C hand? Test 8 heat-treated, irradiated & thermal-shock minerals in 60FPS.
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#4
Why Every Diamond on Earth Should Have Turned Into Pencil Lead—And the Crossed-Polarizer "Tatami" Shadow That Exposes Lab-Grown Diamonds in 2 Seconds
Why Every Diamond on Earth Should Have Turned Into Pencil Lead—And the Crossed-Polarizer "Tatami" Shadow That Exposes Lab-Grown Diamonds in 2 Seconds Minerals & Gemology Interactive Labs
Why do diamonds turn into black graphite pencil lead unless blasted from 200–660 km depth by a supersonic Kimberlite rocket? How do two $10 polarizing filters expose Natural Diamond 'Tatami' strain vs. HPHT and CVD lab-grown diamonds? Explore 660km Ringwoodite & 2026 Bernwoodite in 60FPS.
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#5
Why a $50,000 Paraíba Tourmaline & "Jedi" Spinel Look Like They Have a Battery Inside: The 1-Second Chelsea Red-Filter Test & Surface-Diffused Sapphire Scams
Why a $50,000 Paraíba Tourmaline & "Jedi" Spinel Look Like They Have a Battery Inside: The 1-Second Chelsea Red-Filter Test & Surface-Diffused Sapphire Scams Minerals & Gemology Interactive Labs
Why does Brazilian Paraíba Tourmaline (Cu²⁺) and Burmese 'Jedi' Spinel glow like neon even in the shade? How does a $15 Chelsea Filter turn fake dyed Jade and Cobalt-Glass 'Sapphires' blood red in 1 second, and how does a dish of water expose surface-diffused sapphires? Try it in 60FPS.
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#6
This Crimson Rock Bleeds Drops of Liquid Metal—And This Golden Crystal Sweats Sulfuric Acid That Eats Your Shelf: Native Mercury, "Pyrite Disease" & Self-Shattering Metamict Gems
This Crimson Rock Bleeds Drops of Liquid Metal—And This Golden Crystal Sweats Sulfuric Acid That Eats Your Shelf: Native Mercury, "Pyrite Disease" & Self-Shattering Metamict Gems Minerals & Gemology Interactive Labs
Why does Cinnabar bleed shiny droplets of liquid Native Mercury at room temperature? Why do Pyrite and Marcasite specimens suddenly sprout white frost, sweat concentrated sulfuric acid (Pyrite Disease), and eat through shelves? Explore 8 reactive & self-shattering metamict crystals in 60FPS.
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#7
Scratch This Blue Crystal Up-and-Down and a Nail Cuts It—Turn 90° Sideways and Steel Skids Right Off: Kyanite's Dual Hardness (Mohs 4.5 vs. 7.0), Diamond's Soft Direction &...
Scratch This Blue Crystal Up-and-Down and a Nail Cuts It—Turn 90° Sideways and Steel Skids Right Off: Kyanite's Dual Hardness (Mohs 4.5 vs. 7.0), Diamond's Soft Direction &... Minerals & Gemology Interactive Labs
Why does blue Kyanite have a Mohs hardness of 4.5 when scratched lengthwise, yet jump to Mohs 7.0 when scratched 90° sideways on the exact same face? Discover how cutters polish Mohs-10 Diamonds along their soft [100] direction, bust fake Howlite Turquoise, and weigh SG 7.0 crystals in 60FPS.
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#8
Drop This Rainbow Opal in Water and Its Fire Vanishes Into Clear Glass: "Thirsty" Ethiopian Welo vs. Australian Opal, True Alexandrite & The Fake Corundum Trap
Drop This Rainbow Opal in Water and Its Fire Vanishes Into Clear Glass: "Thirsty" Ethiopian Welo vs. Australian Opal, True Alexandrite & The Fake Corundum Trap Minerals & Gemology Interactive Labs
Why does an Ethiopian Welo Opal drink water, turn clear like glass, and lose all its rainbow fire until it dries—while hand lotion ruins it forever? How does True Alexandrite flip from emerald green in daylight to ruby red in candlelight? Test 8 color-change & opal gems in 60FPS.
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#9
Open the Box in Sunlight and This Ruby-Red Crystal Crumbles Into Yellow Dust: 8 "Vampire" Light-Sensitive Minerals & The Usambara Thickness Color Flip
Open the Box in Sunlight and This Ruby-Red Crystal Crumbles Into Yellow Dust: 8 "Vampire" Light-Sensitive Minerals & The Usambara Thickness Color Flip Minerals & Gemology Interactive Labs
Why does a gemmy ruby-red Realgar crystal swell by +9.6% and crumble into yellow Pararealgar dust when exposed to ordinary room light? Why does clear Vivianite turn black in air, and how does Usambara Tourmaline flip from emerald green at 2mm to blood red at 9mm? Test 8 crystals in 60FPS.
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#10
Press This Room-Temperature Crystal Onto an Ice Cube and It Slices Straight Through Like a Hot Laser: The 2,200 W/m·K Ice-Cutter Test, Breath-Fog Trick & 8 Super-Thermal Minerals
Press This Room-Temperature Crystal Onto an Ice Cube and It Slices Straight Through Like a Hot Laser: The 2,200 W/m·K Ice-Cutter Test, Breath-Fog Trick & 8 Super-Thermal Minerals Minerals & Gemology Interactive Labs
Hold a real Diamond or Moissanite between your fingers and press it onto an ice cube: it slices straight through like a hot knife because Diamond conducts heat 5x faster than solid Copper (2,200 W/m·K)! Run the 60FPS Ice-Cutter & 0.2-Second Breath-Fog Test on 8 minerals.
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#11
This Green Crystal Stole Another Rock's Body Atom-by-Atom: "Body-Snatcher" Pseudomorphs, The 84.55° Japan-Law Twin & Fake "Fairy Crosses"
This Green Crystal Stole Another Rock's Body Atom-by-Atom: "Body-Snatcher" Pseudomorphs, The 84.55° Japan-Law Twin & Fake "Fairy Crosses" Minerals & Gemology Interactive Labs
How can fibrous green Malachite or Precious Rainbow Opal hijack the exact crystal shape of Azurite, freezing-sea Ikaite ('Pineapple Opal'), or an Ammonite shell atom-by-atom? Why do Japan-Law Quartz Twins lock at 84.55° and how do you bust fake soapstone Fairy Crosses? Test 8 crystals in 60FPS.
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#12
Turn This Crystal 90° and It Changes From Sapphire Blue to Water-Clear Yellow: The "Viking Sunstone" (Iolite), Why Tourmaline Turns Pitch-Black From the End & 8 Pleochroic Gems
Turn This Crystal 90° and It Changes From Sapphire Blue to Water-Clear Yellow: The "Viking Sunstone" (Iolite), Why Tourmaline Turns Pitch-Black From the End & 8 Pleochroic Gems Minerals & Gemology Interactive Labs
Rotate a Viking Sunstone (Iolite) by 90° and watch a deep sapphire-blue crystal turn water-clear yellow in your hand! Discover why green Tourmaline turns pitch-black down the c-axis, why Andalusite flashes green and red at once, and test 8 pleochroic & 2026 IMA crystals in 60FPS.
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#13
Forged at 30,000°C in 0.001 Seconds: How to Spot Fake Moldavite (The 1,713°C "Worm" Test), Petrified Lightning & Forbidden 5-Fold Quasicrystals
Forged at 30,000°C in 0.001 Seconds: How to Spot Fake Moldavite (The 1,713°C "Worm" Test), Petrified Lightning & Forbidden 5-Fold Quasicrystals Minerals & Gemology Interactive Labs
Why is 80% of Moldavite sold online fake green bottle glass—and how do microscopic 1,713°C 'Lechatelierite Worms' prove a piece is real in 5 seconds? Explore Petrified Lightning (Fulgurites), King Tut's Libyan Desert Glass, Forbidden 5-Fold Quasicrystals & Oct 2026 Meteorite minerals in 60FPS.
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#14
6× More Rainbow Fire Than a $20,000 Diamond: 8 Natural Crystals That Out-Sparkle Diamond (& The 3-Second "Line" Fake Test)
6× More Rainbow Fire Than a $20,000 Diamond: 8 Natural Crystals That Out-Sparkle Diamond (& The 3-Second "Line" Fake Test) Minerals & Gemology Interactive Labs
Think Diamond has the most rainbow fire on Earth? Natural Sphalerite (0.156), Demantoid Garnet (0.057), Sphene (0.051), and Rutile (0.280) out-sparkle Diamond by up to 630%! Fire the 60FPS Prism Ray-Tracer and run the 3-second Diamond vs. CZ & Moissanite Line Test.
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#15
Shine a Green Laser at This Red Stone and It Shoots a Red Beam Back—While Lookalike Garnet Stays Dead Black: The 694.3nm Ruby Test, "Lava" Yooperlite & 8 Glowing Crystals
Shine a Green Laser at This Red Stone and It Shoots a Red Beam Back—While Lookalike Garnet Stays Dead Black: The 694.3nm Ruby Test, "Lava" Yooperlite & 8 Glowing Crystals Minerals & Gemology Interactive Labs
Shine a $5 green laser pointer (532nm) into a real Ruby or Red Spinel and it shoots a blazing 694.3nm red beam back—while lookalike Red Garnet stays dead black! Test Iron-Quenching, molten-lava Yooperlite, daylight-glowing Hyalite Opal & 2026 IMA discoveries in 60FPS.
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#16
Your Coucou | If Something's Wrong, Someone Should Know.
Your Coucou | If Something's Wrong, Someone Should Know. Autonomous Agents & Creative AI
I made a daily check in app after I lost my mother. I was a digital nomad and my mother and I spoke daily (for nearly ten years!). I thought I was checking on her, she was the elderly one after all. Turns out she was checking on me too. So once I lost her, I realised no one would know if I was sick, dead, or even where I was in the world. I built Your Coucou to fix that. Comments URL: https://news.ycombinator.com/item?id=50480133 Points: 2 # Comments: 0
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#17
CTRL — Technical assessments built around real work
CTRL — Technical assessments built around real work Autonomous Agents & Creative AI
Hello everyone, I'm building a platform for startups and teams to spend less time screening candidates without using excessing AI. You can create an interview link and reply an application mail, message or for typical technical interviewsCheck it out and let me know what you think!! Comments URL: https://news.ycombinator.com/item?id=50480337 Points: 1 # Comments: 0
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#18
Muzegen.ai | Générateur de musique IA gratuit et plateforme de création de chansons par IA
Muzegen.ai | Générateur de musique IA gratuit et plateforme de création de chansons par IA Autonomous Agents & Creative AI
Muzegen.ai est une plateforme complète de création musicale par IA. Générez des chansons originales, écrivez des paroles avec l'IA, créez des voix chantées, remixez des styles musicaux, produisez des instrumentaux et prolongez vos morceaux en quelques secondes. Exportez vos créations en MP3, WAV, MIDI ou pistes séparées pour les musiciens, créateurs de contenu, vidéastes et projets commerciaux.
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#19
ToolTea: 370+ Free Online Tools for PDF, Image, Video and More
ToolTea: 370+ Free Online Tools for PDF, Image, Video and More Autonomous Agents & Creative AI
ToolTea processes files in your browser. 100% free: no signup, no upload, no watermark, no paid plan. What people search for most. Every category has its full list in the tabs above.
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#20
Lay This Rock Over Printed Text and the Words Teleport to the Top Like an LED Screen: "TV Rock" Ulexite, The "Milk & Honey" Cat's-Eye Test & Fake Fiber-Optic Glass
Lay This Rock Over Printed Text and the Words Teleport to the Top Like an LED Screen: "TV Rock" Ulexite, The "Milk & Honey" Cat's-Eye Test & Fake Fiber-Optic Glass Minerals & Gemology Interactive Labs
Why does natural Ulexite ('TV Rock') teleport printed words straight to its top surface like a fiber-optic screen? How does the 'Milk and Honey' flashlight test separate a $5,000 Chrysoberyl Cat's Eye from $2 fake fiber-optic glass? Test 8 fiber-optic & star gems in 60FPS.
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#21
Tilt This Crystal and a 50-Million-Year-Old Water Bubble Moves Inside | Enhydro Quartz, UV Petroleum & 31.1°C Vanishing Bubble
Tilt This Crystal and a 50-Million-Year-Old Water Bubble Moves Inside | Enhydro Quartz, UV Petroleum & 31.1°C Vanishing Bubble Minerals & Gemology Interactive Labs
Tilt an Enhydro Quartz crystal and watch a 50-million-year-old water bubble slide inside solid stone! Shine 365nm UV on Pakistani Petroleum Quartz to make golden crude oil blaze blue, touch a CO2 inclusion at 31.1°C to make the bubble vanish, and spot fake drilled enhydros in 60FPS.
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#22
90% of "Peacock Ore" Is Dipped in Acid: Fake Aura Quartz vs. Natural Rainbow Crystals
90% of "Peacock Ore" Is Dipped in Acid: Fake Aura Quartz vs. Natural Rainbow Crystals Minerals & Gemology Interactive Labs
Why is 90% of rainbow 'Peacock Ore' sold in rock shops actually brassy Chalcopyrite dipped in bleach or acid? How do you spot PVD-coated 'Angel Aura Quartz' and furnace Carborundum vs. 100% natural Rainbow Goethite and Andrade Hematite? Test 8 rainbow minerals & 2026 IMA discoveries in 60FPS.
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#23
Mistaken for a 100-Million-Year-Old Fossil Fern—It's 0% Plant: 8 Crystals That Grow Like Trees, Grapes & Wire
Mistaken for a 100-Million-Year-Old Fossil Fern—It's 0% Plant: 8 Crystals That Grow Like Trees, Grapes & Wire Minerals & Gemology Interactive Labs
Why do Manganese Dendrites look exactly like fossilized fern leaves when they contain 0% plant matter? How does Indonesian 'Grape Agate' form purple grape bunches, and how does solid Wire Silver squeeze out of rock like toothpaste? Grow 8 self-organizing & Oct 2026 IMA crystals in 60FPS.
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#24
No Human Cut This Cube—And This Crystal Stitched Its Own Broken Bones: 8 Self-Healing & Uncut Crystals
No Human Cut This Cube—And This Crystal Stitched Its Own Broken Bones: 8 Self-Healing & Uncut Crystals Minerals & Gemology Interactive Labs
Why do Navajún Pyrite crystals grow as 90.00° mirror-polished cubes in mudstone with zero human cutting? How does 'Faden' Quartz stitch itself back together after snapping in an earthquake? Test 8 self-healing & 2026 IMA crystals (Xiexiandeite & Bernwoodite) in 60FPS.
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#25
Diamond Ray Tracer | Cut Quality & Light Return Simulator
Diamond Ray Tracer | Cut Quality & Light Return Simulator Minerals & Gemology Interactive Labs
Why is your diamond dark? Use the Ray Tracer to see how Deep vs Shallow cuts leak light. Detect 'Hidden Weight' and avoid bad diamonds.
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