#003898
Closest named color: Sapphire (#2138AB). oklch(38% 0.166 261.1), rgb(0, 56, 152).
Aa
White text reads best on this color (10.40:1).
About this color
#003898 is a dark, vivid blue. In OKLCH its lightness is 38%, its chroma 0.166 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.039 away. White text reads best on it, at 10.40:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | vivid (0.166) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.01:1 |
| White text | 10.40:1 |
Values
| HEX | #003898 |
| RGB | rgb(0, 56, 152) |
| HSL | hsl(218, 100%, 30%) |
| OKLCH | oklch(38% 0.166 261.1) |
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 #003898 | 10.40:1 | AAA | Lc -97.3 | Preferred for body text |
| Black text on #003898 | 2.01:1 | Fails | Lc 10.7 | Not readable |
| #003898 text on white | 10.40:1 | AAA | Lc 93.2 | Preferred for body text |
| #003898 text on black | 2.01:1 | Fails | Lc -9.3 | 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 900.
-
Step 50
50
#F0F6FF
oklch(97.1% 0.014 258.3)
-
Step 100
100
#DFEBFF
oklch(93.7% 0.03 260.7)
-
Step 200
200
#C5DAFF
oklch(88.5% 0.056 261.8)
-
Step 300
300
#9EC1FF
oklch(80.8% 0.096 261.6)
-
Step 400
400
#689FFF
oklch(70.7% 0.153 260.8)
-
Step 500
500
#3E82FF
oklch(63% 0.199 261.3)
-
Step 600
600
#0063FD
oklch(55.6% 0.242 261.1)
-
Step 700
700
#0053D7
oklch(49.2% 0.214 261.1)
-
Step 800
800
#0043B2
oklch(42.7% 0.186 261.1)
-
Step 900
900 (this color)
#003898
oklch(38% 0.166 261.1)
-
Step 950
950
#042258
oklch(27% 0.104 260.8)
#003898 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) | #00479B | 0.039 |
| Deuteranopia (no green cones) | #003996 | 0.004 |
| Tritanopia (no blue cones) | #005162 | 0.125 |
| Achromatopsia (no color) | #404040 | 0.166 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #003898
#003898
oklch(38% 0.166 261.1)
- #573D00
#573D00
oklch(37.9% 0.078 81.4)
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 #003898, closest first.
No curated palette has a color within ΔE 0.04 of #003898.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.039
- Cobalt #1E488F ΔE 0.052
- Twilight Blue #0A437A ΔE 0.060
- Royal #0C1793 ΔE 0.065
- Cobalt Blue #030AA7 ΔE 0.073
- Ultramarine #2000B1 ΔE 0.077
- Indigo Blue #3A18B1 ΔE 0.078
- Marine Blue #01386A ΔE 0.078
Use #003898 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.