#303DA5
Closest named color: Sapphire (#2138AB). oklch(41.8% 0.166 271.6), rgb(48, 61, 165).
Aa
White text reads best on this color (8.98:1).
About this color
#303DA5 is a dark, vivid blue. In OKLCH its lightness is 42%, its chroma 0.166 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.024 away. White text reads best on it, at 8.98:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | vivid (0.166) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.33:1 |
| White text | 8.98:1 |
Values
| HEX | #303DA5 |
| RGB | rgb(48, 61, 165) |
| HSL | hsl(233, 55%, 42%) |
| OKLCH | oklch(41.8% 0.166 271.6) |
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 #303DA5 | 8.98:1 | AAA | Lc -94.5 | Preferred for body text |
| Black text on #303DA5 | 2.33:1 | Fails | Lc 13.9 | Not readable |
| #303DA5 text on white | 8.98:1 | AAA | Lc 90.1 | Preferred for body text |
| #303DA5 text on black | 2.33:1 | Fails | Lc -12.2 | 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
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E3E9FD
oklch(93.5% 0.028 272.5)
-
Step 200
200
#CCD8FE
oklch(88.5% 0.054 271.5)
-
Step 300
300
#AABDFF
oklch(80.8% 0.096 271.7)
-
Step 400
400
#7F98FF
oklch(70.6% 0.153 271.7)
-
Step 500
500
#617AFF
oklch(63% 0.198 271.6)
-
Step 600
600
#4B5EEF
oklch(55.5% 0.217 271.6)
-
Step 700
700
#3D4CD0
oklch(49% 0.202 271.6)
-
Step 800
800 (this color)
#303DA5
oklch(41.8% 0.166 271.6)
-
Step 900
900
#2B3885
oklch(37.7% 0.129 271.5)
-
Step 950
950
#19214E
oklch(26.9% 0.083 272.1)
#303DA5 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) | #004FA8 | 0.049 |
| Deuteranopia (no green cones) | #0044A3 | 0.035 |
| Tritanopia (no blue cones) | #00586B | 0.134 |
| Achromatopsia (no color) | #494949 | 0.167 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #303DA5
#303DA5
oklch(41.8% 0.166 271.6)
- #5E4A00
#5E4A00
oklch(41.8% 0.085 90.9)
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 #303DA5, closest first.
No curated palette has a color within ΔE 0.04 of #303DA5.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.024
- Blueberry #464196 ΔE 0.042
- Cobalt #1E488F ΔE 0.049
- Dark Slate Blue #483D8B ΔE 0.055
- Blue Blue #2242C7 ΔE 0.057
- Majorelle Blue #3F37C9 ΔE 0.061
- Indigo Blue #3A18B1 ΔE 0.063
- Dusk Blue #26538D ΔE 0.073
Use #303DA5 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.