#304899
Closest named color: Cobalt (#1E488F). oklch(43% 0.135 267.9), rgb(48, 72, 153).
Aa
White text reads best on this color (8.35:1).
About this color
#304899 is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.135 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.025 away. White text reads best on it, at 8.35:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.135) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.51:1 |
| White text | 8.35:1 |
Values
| HEX | #304899 |
| RGB | rgb(48, 72, 153) |
| HSL | hsl(226, 52%, 39%) |
| OKLCH | oklch(43% 0.135 267.9) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #304899 | 8.35:1 | AAA | Lc -93.1 | Preferred for body text |
| Black text on #304899 | 2.51:1 | Fails | Lc 15.5 | Dividers and decoration only |
| #304899 text on white | 8.35:1 | AAA | Lc 88.5 | Fine for body text |
| #304899 text on black | 2.51:1 | Fails | Lc -13.7 | Not readable |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 800.
-
Step 50
50
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E3EAFA
oklch(93.6% 0.023 266.9)
-
Step 200
200
#CCD9F7
oklch(88.5% 0.044 266.9)
-
Step 300
300
#AABFF5
oklch(80.8% 0.08 268.1)
-
Step 400
400
#7E9DF0
oklch(70.7% 0.127 267.6)
-
Step 500
500
#5F82EA
oklch(63.1% 0.161 267.6)
-
Step 600
600
#4769D9
oklch(55.7% 0.176 267.6)
-
Step 700
700
#3956BC
oklch(49% 0.164 267.9)
-
Step 800
800 (this color)
#304899
oklch(43% 0.135 267.9)
-
Step 900
900
#293D79
oklch(37.8% 0.105 267.4)
-
Step 950
950
#182447
oklch(27% 0.067 267.5)
#304899 with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #15539C | 0.033 |
| Deuteranopia (no green cones) | #004997 | 0.032 |
| Tritanopia (no blue cones) | #005B69 | 0.111 |
| Achromatopsia (no color) | #4E4E4E | 0.136 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #304899
#304899
oklch(43% 0.135 267.9)
- #644C00
#644C00
oklch(43% 0.088 87.7)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #304899, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.025
- Blueberry #464196 ΔE 0.033
- Dusk Blue #26538D ΔE 0.039
- Dark Slate Blue #483D8B ΔE 0.045
- Light Navy #155084 ΔE 0.049
- Sapphire #2138AB ΔE 0.054
- Twilight #4E518B ΔE 0.057
- Denim Blue #3B5B92 ΔE 0.060
Use #304899 in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.