#2571A9
Closest named color: Flat Blue (#3C73A8). oklch(53% 0.114 245.1), rgb(37, 113, 169).
Aa
White text reads best on this color (5.23:1).
About this color
#2571A9 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 53%, its chroma 0.114 and its hue 245°. Its hue sits on the cool side of the wheel. The nearest named color is Flat Blue (#3C73A8), ΔE 0.019 away. White text reads best on it, at 5.23:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | moderately saturated (0.114) |
| Temperature | cool |
| Nearest name | Flat Blue (#3C73A8) |
| Black text | 4.01:1 |
| White text | 5.23:1 |
Values
| HEX | #2571A9 |
| RGB | rgb(37, 113, 169) |
| HSL | hsl(205, 64%, 40%) |
| OKLCH | oklch(53% 0.114 245.1) |
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 #2571A9 | 5.23:1 | AA | Lc -81.0 | Fine for body text |
| Black text on #2571A9 | 4.01:1 | AA large text | Lc 28.5 | Dividers and decoration only |
| #2571A9 text on white | 5.23:1 | AA | Lc 75.6 | Fine for body text |
| #2571A9 text on black | 4.01:1 | AA large text | Lc -26.1 | 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
#E2EBF3
oklch(93.6% 0.015 244.7)
-
Step 200
200
#CADCEB
oklch(88.6% 0.028 243.1)
-
Step 300
300
#A6C5E0
oklch(81% 0.051 244.8)
-
Step 400
400
#74A6D1
oklch(70.6% 0.083 245.3)
-
Step 500
500
#4E90C5
oklch(63.2% 0.105 244.8)
-
Step 600
600 (this color)
#2571A9
oklch(53% 0.114 245.1)
-
Step 700
700
#206599
oklch(49% 0.107 245.6)
-
Step 800
800
#1D537C
oklch(42.7% 0.088 245.2)
-
Step 900
900
#1E4563
oklch(37.7% 0.068 244.3)
-
Step 950
950
#13283A
oklch(26.9% 0.043 246.2)
#2571A9 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) | #5773AB | 0.048 |
| Deuteranopia (no green cones) | #4467A8 | 0.035 |
| Tritanopia (no blue cones) | #007F85 | 0.082 |
| Achromatopsia (no color) | #6C6C6C | 0.114 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2571A9
#2571A9
oklch(53% 0.114 245.1)
- #985C0D
#985C0D
oklch(53.1% 0.114 65.4)
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 #2571A9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Flat Blue #3C73A8 ΔE 0.019
- Muted Blue #3B719F ΔE 0.022
- Nice Blue #107AB0 ΔE 0.026
- Ocean Blue #03719C ΔE 0.026
- Mid Blue #276AB3 ΔE 0.028
- French Blue #436BAD ΔE 0.030
- Sea Blue #047495 ΔE 0.038
- Dull Blue #49759C ΔE 0.040
Use #2571A9 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.