#2170A2
Closest named color: Ocean Blue (#03719C). oklch(52.3% 0.108 241.6), rgb(33, 112, 162).
Aa
White text reads best on this color (5.37:1).
About this color
#2170A2 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 52%, its chroma 0.108 and its hue 242°. Its hue sits on the cool side of the wheel. The nearest named color is Ocean Blue (#03719C), ΔE 0.015 away. White text reads best on it, at 5.37:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | moderately saturated (0.108) |
| Temperature | cool |
| Nearest name | Ocean Blue (#03719C) |
| Black text | 3.90:1 |
| White text | 5.37:1 |
Values
| HEX | #2170A2 |
| RGB | rgb(33, 112, 162) |
| HSL | hsl(203, 66%, 38%) |
| OKLCH | oklch(52.3% 0.108 241.6) |
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 #2170A2 | 5.37:1 | AA | Lc -81.8 | Fine for body text |
| Black text on #2170A2 | 3.90:1 | AA large text | Lc 27.6 | Dividers and decoration only |
| #2170A2 text on white | 5.37:1 | AA | Lc 76.4 | Fine for body text |
| #2170A2 text on black | 3.90:1 | AA large text | Lc -25.3 | Dividers and decoration only |
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 700.
-
Step 50
50
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E1EBF3
oklch(93.5% 0.015 241.8)
-
Step 200
200
#C9DCEB
oklch(88.5% 0.029 241.6)
-
Step 300
300
#A4C6E0
oklch(81% 0.052 241.2)
-
Step 400
400
#70A7D0
oklch(70.6% 0.084 241.6)
-
Step 500
500
#4791C4
oklch(63.1% 0.107 241.3)
-
Step 600
600
#237AB1
oklch(55.6% 0.117 241.8)
-
Step 700
700 (this color)
#2170A2
oklch(52.3% 0.108 241.6)
-
Step 800
800
#15547B
oklch(42.7% 0.089 241.3)
-
Step 900
900
#1A4663
oklch(37.8% 0.069 241)
-
Step 950
950
#11293A
oklch(27% 0.044 241.7)
#2170A2 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) | #5971A4 | 0.053 |
| Deuteranopia (no green cones) | #4765A1 | 0.041 |
| Tritanopia (no blue cones) | #007C82 | 0.072 |
| Achromatopsia (no color) | #6A6A6A | 0.108 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2170A2
#2170A2
oklch(52.3% 0.108 241.6)
- #95591B
#95591B
oklch(52.2% 0.108 61.5)
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 #2170A2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Ocean Blue #03719C ΔE 0.015
- Muted Blue #3B719F ΔE 0.020
- Flat Blue #3C73A8 ΔE 0.025
- Sea Blue #047495 ΔE 0.029
- Nice Blue #107AB0 ΔE 0.032
- Mid Blue #276AB3 ΔE 0.035
- Peacock Blue #016795 ΔE 0.036
- French Blue #436BAD ΔE 0.036
Use #2170A2 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.