#2170A9
Closest named color: Flat Blue (#3C73A8). oklch(52.7% 0.116 245), rgb(33, 112, 169).
Aa
White text reads best on this color (5.30:1).
About this color
#2170A9 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 53%, its chroma 0.116 and its hue 245°. Its hue sits on the cool side of the wheel. The nearest named color is Flat Blue (#3C73A8), ΔE 0.023 away. White text reads best on it, at 5.30:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | moderately saturated (0.116) |
| Temperature | cool |
| Nearest name | Flat Blue (#3C73A8) |
| Black text | 3.95:1 |
| White text | 5.30:1 |
Values
| HEX | #2170A9 |
| RGB | rgb(33, 112, 169) |
| HSL | hsl(205, 67%, 40%) |
| OKLCH | oklch(52.7% 0.116 245) |
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 #2170A9 | 5.30:1 | AA | Lc -81.4 | Fine for body text |
| Black text on #2170A9 | 3.95:1 | AA large text | Lc 28.1 | Dividers and decoration only |
| #2170A9 text on white | 5.30:1 | AA | Lc 76.0 | Fine for body text |
| #2170A9 text on black | 3.95:1 | AA large text | Lc -25.7 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E2EBF4
oklch(93.6% 0.016 248)
-
Step 200
200
#CADCEC
oklch(88.6% 0.029 244.9)
-
Step 300
300
#A5C5E1
oklch(80.9% 0.053 244.9)
-
Step 400
400
#73A6D2
oklch(70.6% 0.085 245.4)
-
Step 500
500
#4C90C6
oklch(63.2% 0.107 244.6)
-
Step 600
600 (this color)
#2170A9
oklch(52.7% 0.116 245)
-
Step 700
700
#1D659A
oklch(49% 0.109 245.5)
-
Step 800
800
#1B537C
oklch(42.7% 0.089 244.6)
-
Step 900
900
#1D4564
oklch(37.7% 0.07 244.6)
-
Step 950
950
#12283B
oklch(26.9% 0.045 246.6)
#2170A9 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) | #5572AB | 0.048 |
| Deuteranopia (no green cones) | #4266A8 | 0.035 |
| Tritanopia (no blue cones) | #007E85 | 0.081 |
| Achromatopsia (no color) | #6B6B6B | 0.116 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2170A9
#2170A9
oklch(52.7% 0.116 245)
- #985A05
#985A05
oklch(52.7% 0.117 64.7)
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 #2170A9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Flat Blue #3C73A8 ΔE 0.023
- Muted Blue #3B719F ΔE 0.024
- Ocean Blue #03719C ΔE 0.025
- Mid Blue #276AB3 ΔE 0.026
- Nice Blue #107AB0 ΔE 0.028
- French Blue #436BAD ΔE 0.030
- Sea Blue #047495 ΔE 0.039
- Peacock Blue #016795 ΔE 0.042
Use #2170A9 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.