#2F789B
Closest named color: Cerulean (#457B9D). oklch(54.3% 0.09 232.7), rgb(47, 120, 155).
Aa
White text reads best on this color (4.90:1).
About this color
#2F789B is a medium-dark, moderately saturated blue. In OKLCH its lightness is 54%, its chroma 0.090 and its hue 233°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean (#457B9D), ΔE 0.022 away. White text reads best on it, at 4.90:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.090) |
| Temperature | cool |
| Nearest name | Cerulean (#457B9D) |
| Black text | 4.28:1 |
| White text | 4.90:1 |
Values
| HEX | #2F789B |
| RGB | rgb(47, 120, 155) |
| HSL | hsl(199, 53%, 40%) |
| OKLCH | oklch(54.3% 0.09 232.7) |
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 #2F789B | 4.90:1 | AA | Lc -79.1 | Fine for body text |
| Black text on #2F789B | 4.28:1 | AA large text | Lc 30.4 | Non-text elements, placeholder text |
| #2F789B text on white | 4.90:1 | AA | Lc 73.7 | Content text, not long reading |
| #2F789B text on black | 4.28:1 | AA large text | Lc -28.0 | 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
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E3EBF0
oklch(93.5% 0.011 234.8)
-
Step 200
200
#CBDCE6
oklch(88.5% 0.023 233.4)
-
Step 300
300
#A8C6D7
oklch(81% 0.04 232.8)
-
Step 400
400
#78A8C3
oklch(70.7% 0.065 233.5)
-
Step 500
500
#5292B3
oklch(63% 0.082 232.6)
-
Step 600
600 (this color)
#2F789B
oklch(54.3% 0.09 232.7)
-
Step 700
700
#256888
oklch(49% 0.084 233)
-
Step 800
800
#21556F
oklch(42.7% 0.07 233.5)
-
Step 900
900
#21465A
oklch(37.6% 0.054 234.4)
-
Step 950
950
#142934
oklch(26.9% 0.034 232.8)
#2F789B 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) | #67779D | 0.059 |
| Deuteranopia (no green cones) | #586C9A | 0.050 |
| Tritanopia (no blue cones) | #008184 | 0.055 |
| Achromatopsia (no color) | #717171 | 0.090 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2F789B
#2F789B
oklch(54.3% 0.09 232.7)
- #98603B
#98603B
oklch(54.3% 0.09 53.2)
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 #2F789B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean #457B9D ΔE 0.022
- Dull Blue #49759C ΔE 0.024
- Muted Blue #3B719F ΔE 0.024
- Sea Blue #047495 ΔE 0.026
- Ocean #017B92 ΔE 0.027
- Flat Blue #3C73A8 ΔE 0.030
- Ocean Blue #03719C ΔE 0.031
- Stormy Blue #507B9C ΔE 0.033
Use #2F789B 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.