#003697
Closest named color: Sapphire (#2138AB). oklch(37.5% 0.167 261.5), rgb(0, 54, 151).
Aa
White text reads best on this color (10.63:1).
About this color
#003697 is a dark, vivid blue. In OKLCH its lightness is 37%, its chroma 0.167 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.042 away. White text reads best on it, at 10.63:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | vivid (0.167) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 1.97:1 |
| White text | 10.63:1 |
Values
| HEX | #003697 |
| RGB | rgb(0, 54, 151) |
| HSL | hsl(219, 100%, 30%) |
| OKLCH | oklch(37.5% 0.167 261.5) |
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 #003697 | 10.63:1 | AAA | Lc -97.7 | Preferred for body text |
| Black text on #003697 | 1.97:1 | Fails | Lc 10.2 | Not readable |
| #003697 text on white | 10.63:1 | AAA | Lc 93.7 | Preferred for body text |
| #003697 text on black | 1.97:1 | Fails | Lc -8.8 | 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
#699EFF
oklch(70.6% 0.153 261.6)
-
Step 500
500
#3F82FF
oklch(63.1% 0.198 261.5)
-
Step 600
600
#0362FF
oklch(55.6% 0.245 261.5)
-
Step 700
700
#0051D9
oklch(49% 0.219 261.5)
-
Step 800
800
#0042B4
oklch(42.7% 0.19 261.5)
-
Step 900
900 (this color)
#003697
oklch(37.5% 0.167 261.5)
-
Step 950
950
#052159
oklch(26.9% 0.107 261.8)
#003697 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) | #00459A | 0.039 |
| Deuteranopia (no green cones) | #003895 | 0.006 |
| Tritanopia (no blue cones) | #005061 | 0.127 |
| Achromatopsia (no color) | #3E3E3E | 0.167 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #003697
#003697
oklch(37.5% 0.167 261.5)
- #553C00
#553C00
oklch(37.4% 0.077 82.1)
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 #003697, closest first.
No curated palette has a color within ΔE 0.04 of #003697.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.042
- Cobalt #1E488F ΔE 0.056
- Royal #0C1793 ΔE 0.060
- Twilight Blue #0A437A ΔE 0.062
- Cobalt Blue #030AA7 ΔE 0.069
- Ultramarine #2000B1 ΔE 0.074
- Marine Blue #01386A ΔE 0.077
- Indigo Blue #3A18B1 ΔE 0.077
Use #003697 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.