#103F55
Closest named color: Dark Blue Grey (#1F3B4D). oklch(34.8% 0.062 233.2), rgb(16, 63, 85).
Aa
White text reads best on this color (11.26:1).
About this color
#103F55 is a dark, muted blue. In OKLCH its lightness is 35%, its chroma 0.062 and its hue 233°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.019 away. White text reads best on it, at 11.26:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | muted (0.062) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.86:1 |
| White text | 11.26:1 |
Values
| HEX | #103F55 |
| RGB | rgb(16, 63, 85) |
| HSL | hsl(199, 68%, 20%) |
| OKLCH | oklch(34.8% 0.062 233.2) |
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 #103F55 | 11.26:1 | AAA | Lc -99.5 | Preferred for body text |
| Black text on #103F55 | 1.86:1 | Fails | Lc 8.2 | Not readable |
| #103F55 text on white | 11.26:1 | AAA | Lc 95.7 | Preferred for body text |
| #103F55 text on black | 1.86:1 | Fails | Lc 0.0 | 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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E2ECF2
oklch(93.7% 0.013 233.7)
-
Step 200
200
#C9DCE8
oklch(88.4% 0.026 235.4)
-
Step 300
300
#A4C6DA
oklch(80.8% 0.046 233.9)
-
Step 400
400
#70A9C8
oklch(70.7% 0.075 233.1)
-
Step 500
500
#4793BA
oklch(63.1% 0.095 233.4)
-
Step 600
600
#217DA6
oklch(55.7% 0.104 232.9)
-
Step 700
700
#11698E
oklch(49.1% 0.096 233)
-
Step 800
800
#145674
oklch(42.8% 0.08 233.4)
-
Step 900
900 (this color)
#103F55
oklch(34.8% 0.062 233.2)
-
Step 950
950
#102A37
oklch(27.1% 0.04 232.6)
#103F55 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) | #343E56 | 0.040 |
| Deuteranopia (no green cones) | #2B3855 | 0.033 |
| Tritanopia (no blue cones) | #004546 | 0.039 |
| Achromatopsia (no color) | #3B3B3B | 0.062 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #103F55
#103F55
oklch(34.8% 0.062 233.2)
- #533019
#533019
oklch(34.8% 0.062 52.6)
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 #103F55, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.019
- Midnight Green #073B4C ΔE 0.020
- Charcoal #264653 ΔE 0.034
- Prussian Blue #1D3557 ΔE 0.034
- Dark Grey Blue #29465B ΔE 0.036
- Marine Blue #01386A ΔE 0.048
- Onyx #343A40 ΔE 0.050
- Gunmetal #293241 ΔE 0.050
Use #103F55 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.