#2170B9
Closest named color: Mid Blue (#276AB3). oklch(53.6% 0.136 250.8), rgb(33, 112, 185).
Aa
White text reads best on this color (5.14:1).
About this color
#2170B9 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 54%, its chroma 0.136 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.017 away. White text reads best on it, at 5.14:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.136) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 4.08:1 |
| White text | 5.14:1 |
Values
| HEX | #2170B9 |
| RGB | rgb(33, 112, 185) |
| HSL | hsl(209, 70%, 43%) |
| OKLCH | oklch(53.6% 0.136 250.8) |
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 #2170B9 | 5.14:1 | AA | Lc -80.4 | Fine for body text |
| Black text on #2170B9 | 4.08:1 | AA large text | Lc 29.1 | Dividers and decoration only |
| #2170B9 text on white | 5.14:1 | AA | Lc 75.0 | Fine for body text |
| #2170B9 text on black | 4.08:1 | AA large text | Lc -26.7 | 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 600.
-
Step 50
50
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E1EBF6
oklch(93.6% 0.018 250.6)
-
Step 200
200
#C9DBEF
oklch(88.4% 0.034 251)
-
Step 300
300
#A4C4E8
oklch(80.9% 0.062 251.6)
-
Step 400
400
#71A5DC
oklch(70.7% 0.098 250.7)
-
Step 500
500
#498DD2
oklch(63% 0.125 250.8)
-
Step 600
600 (this color)
#2170B9
oklch(53.6% 0.136 250.8)
-
Step 700
700
#1A63A5
oklch(49.1% 0.126 250.6)
-
Step 800
800
#195186
oklch(42.7% 0.105 250.8)
-
Step 900
900
#1C436B
oklch(37.6% 0.082 251.4)
-
Step 950
950
#11283F
oklch(27.1% 0.052 250.3)
#2170B9 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) | #4D75BC | 0.041 |
| Deuteranopia (no green cones) | #3467B8 | 0.026 |
| Tritanopia (no blue cones) | #00818B | 0.100 |
| Achromatopsia (no color) | #6D6D6D | 0.136 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2170B9
#2170B9
oklch(53.6% 0.136 250.8)
- #976000
#976000
oklch(53.7% 0.116 70.8)
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 #2170B9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.017
- Windows Blue #3778BF ΔE 0.030
- French Blue #436BAD ΔE 0.031
- Nice Blue #107AB0 ΔE 0.035
- Flat Blue #3C73A8 ΔE 0.035
- Muted Blue #3B719F ΔE 0.045
- Ocean Blue #03719C ΔE 0.049
- Dull Blue #49759C ΔE 0.059
Use #2170B9 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.