| | | | (+3,
-3) | | Condiment Broadband | | Food: Condiment: Mix |
| | | | (+1,
-1) | | Condiment dispenser | | Product: Condiment Dispenser |
| | | | (0) | | condiments | | Halfbakery: Vote Display |
| | | | (+3,
-3) | | conductive putty connections | | Computer: Connector |
| | | | (0) | | Cone Headphones | | Product: Headphones |
| | | | (+3,
-3) | | Confidential public-access genome database | | Science: Health |
| | | | (0) | | Configurable art goggles | | Culture: Art: Visual |
| | | | (+1,
-1) | | Configurable Key for Keyboard | | Computer: Keyboard |
| | | | (0) | | Configuration Cache | | Computer: Configuration |
| | | | (0) | | confuse and bewilder people | | Culture: Conversation |
| | | | (+6,
-6) | | Congopen | | Vehicle: |
| | | | (+4,
-4) | | connect four! | | Culture: Office Games |
| | | | (+1,
-1) | | Conquistadors 2014 | | Culture: Revival |
| | | | (0) | | Conservation Royalty | | Public: |
| | | | (0) | | Conspiracy Board | | Product: Game |
| | | | (+2,
-2) | | Conspiracy Theory Education Gimmick | | Public: Education: Conspiracy Theory |
| | | | (0) | | Constant Ad Ratio | | Culture: Television: Ad |
| | | | (+1,
-1) | | constant substitution (American) football | | Sport: American Football |
| | | | (0) | | Construction toy | | Product: Toy: Construction |
| | | | (0) | | Constructionism Truck Bed | | Vehicle: Car: Adjustable |
| | | | (0) | | Consumer Price Diversity Index | | Public: Economy |
| | | | (+1,
-1) | | Consumer Sovereignity Voting | | Public: Election: Alternative |
| | | | (0) | | contact lenses for sad dogs | | Business: Service: Personal: Emotional |
| | | | (0) | | Contact sunglasses | | Science: Health: Eye: Contact Lens |
| | | | (+1,
-1) | | Contacts Card | | Product: Greeting Card |
| | | | (0) | | ContactUs.com | | Computer: Web Technology |
| | | | (+2,
-2) | | Contagious Cures | | Science: Health |
| | | | (0) | | content documentation though video | | Computer: Email |
| | | | (0) | | Contentious will service | | Business: Service: Personal: Advice |
| | | | (0) | | Context Preview | | Computer: Display: Color |
| | | | (0) | | context sensitive interface via bluetooth low energy | | Product: Light: Control |
| | | | (+1,
-1) | | continuedDiscussions.com | | Computer: Web Technology |
| | | | (+6,
-6) | | Continuosly Varying Timepiece | | Product: Clock |
| | | | (0) | | Continuous winemaking | | Food: Alcohol: Wine |
| | | | (+7,
-7) | | Continuously Fresh Underwear | | Fashion: Underwear: Hygiene |
| | | | (+3,
-3) | | continuously variable runner length | | Vehicle: Car: Engine: Aspiration |
| | | | (0) | | Contra-rotating planet | | Science: Energy: Rotational |
| | | | (+2,
-2) | | Contrablution | | Home: Bathtub |
| | | | (0) | | Contractors Sand-n-Poison | | Home: Garden: Weed |
| | | | (+3,
-3) | | ContraLike | | Computer: Web: Video |
| | | | (+1,
-1) | | Controlled sidewalk lanes | | Vehicle: Road |
| | | | (0) | | controller for the coordinated | | Computer: Input Device: Gaming |
| | | | (+2,
-2) | | Convection Toaster | | Product: Toaster |
| | | | (0) | | Conveniently Secure Smartphone Lock | | Product: Cell Phone: Countermeasure |
| | | | (0) | | Convention | | Halfbakery: Meeting |
| | | | (0) | | Convergent Pistons | | Vehicle: Car: Engine: Cylinder |
| | | | (+2,
-2) | | Conversation Radio Cannon | | Product: Audio |
| | | | (+1,
-1) | | Conversational Text Markup | | Computer: Presentation Software |
| | | | (+2,
-2) | | Convert methane to other chemicals with triorbital aperiodic effects | | Science: Energy: Bioenergy: Methane |
| | | | (+1,
-1) | | Convert Stephen Hawking Into A Black Hole | | Science: Physics: Black Hole |
| | | | (+2,
-2) | | Convertable Toaster | | Product: Toaster |
| | | | (0) | | Convertible Mobility Scooter | | Vehicle: Scooter |
| | | | (0) | | Conveyor belt door protector | | Home: Door: Access Control |
| | | | (0) | | Conveyor Belt Petrol Stations | | Vehicle: Car: Fuel: Station |
| | | | (+1,
-1) | | conzertina loudspeaker drones | | Product: Headphones |
| | | | (0) | | Cool Ideas | | Halfbakery: Related Forums |
| | | | (+1,
-1) | | Cool One Armed Bandit | | Product: Refrigerator: Lock |
| | | | (0) | | Cool Party trick | | Culture: |
| | | | (+2,
-2) | | Cool Room Light Switches - Now 50% Less Boneable | | Public: Architecture: Feature |
| | | | (0) | | Cool Thermal Scans | | Culture: Movie |
| | | | (0) | | Cooling for shuttle | | Vehicle: |
| | | | (0) | | Cooperative Scrabble | | Culture: Game: Scrabble |
| | | | (0) | | Cop Alert | | Vehicle: Car: Indicator |
| | | | (+1,
-1) | | Copy Cats | | Business: Advertising: Ad Campaign |
| | | | (0) | | Copy & paste | | Computer: Keyboard: Keys |
| | | | (0) | | Copyright Protection | | Halfbakery: Idea |
| | | | (0) | | co-Q | | Product: Cell Phone: Location |
| | | | (0) | | coral lampshade | | Culture: Art |
| | | | (0) | | Cord Corliolis Countermeasure | | Product: Plug |
| | | | (+2,
-2) | | Corded Bluetooth Headset | | Product: Phone |
| | | | (0) | | Cordless hybrid screwdriver | | Product: Tool: Screw |
| | | | (0) | | Cordless Phone Translocational Charger | | Product: Cordless Phone |
| | | | (0) | | Corian linoleum | | Home: Floor |
| | | | (0) | | Corn Nerf Darts | | Sport: Projectile |
| | | | (0) | | Corner of your eye | | Science: Health: Eye: Glasses |
| | | | (0) | | Cornucopia Design | | Product: Design |
| | | | (0) | | Corona virus killing robot | | Product: Robot: Domestic |
| | | | (+1,
-1) | | Coronation Street reality show | | Culture: Reality TV |
| | | | (+1,
-1) | | Corporate Rights | | Public: Law: Constitution |
| | | | (+2,
-2) | | Corporation Supplemented Money | | Business: Advertising: Product Placement |
| | | | (0) | | Corrected hour record | | Sport: Racing: Cycling |
| | | | (0) | | Correlated GDP Tax | | Public: Tax: Income Tax |
| | | | (0) | | Correlative Advertising | | Business: Advertising |
| | | | (+2,
-2) | | Cosmetic tooth coloring | | Fashion: Cosmetics |
| | | | (+2,
-2) | | Cosmic Background Crystal Radio | | Science: Energy |
| | | | (0) | | Cosmic Ray Shield | | Science: Spacecraft |
| | | | (0) | | Cost of Accommodation Calculator | | Culture: Website: Price Guide |
| | | | (+1,
-1) | | Cotton Candy Toilet Bowl | | Home: Toilet Paper Holder |
| | | | (0) | | Cougar-drawn chariots | | Product: Mobility |
| | | | (0) | | Coughfee | | Public: Tax |
| | | | (0) | | Countdown Clock | | Product: Clock: Timer |
| | | | (+2,
-2) | | counter oscillating magnet generator | | Product: Power Source: Generator |
| | | | (+4,
-4) | | Counter-Rotating Crankshaft | | Vehicle: Car: Engine |
| | | | (+2,
-2) | | Country Funk | | Culture: Music: Style |
| | | | (0) | | County drug laws | | Public: Drug Politics |
| | | | (0) | | Courtesy App for Movie-Goers | | Product: Cell Phone: Audio |
| | | | (+3,
-3) | | Covered Highway Wind Tunnel | | Vehicle: Road: Highway |
| | | | (+1,
-1) | | COVID Test Tissues | | Science: Body: Nose |
| | | | (0) | | Covidom | | Science: Health: Hygiene |
| | | | (0) | | cowpie gathering robot | | Science: Energy: Bioenergy: Methane |