#2F439B
Closest named color: Cobalt (#1E488F). oklch(42% 0.145 269.5), rgb(47, 67, 155).
Aa
White text reads best on this color (8.76:1).
About this color
#2F439B is a dark, vivid blue. In OKLCH its lightness is 42%, its chroma 0.145 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.029 away. White text reads best on it, at 8.76:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | vivid (0.145) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.39:1 |
| White text | 8.76:1 |
Values
| HEX | #2F439B |
| RGB | rgb(47, 67, 155) |
| HSL | hsl(229, 53%, 40%) |
| OKLCH | oklch(42% 0.145 269.5) |
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 #2F439B | 8.76:1 | AAA | Lc -94.1 | Preferred for body text |
| Black text on #2F439B | 2.39:1 | Fails | Lc 14.4 | Not readable |
| #2F439B text on white | 8.76:1 | AAA | Lc 89.6 | Fine for body text |
| #2F439B text on black | 2.39:1 | Fails | Lc -12.6 | Not readable |
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 800.
-
Step 50
50
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E3EAFB
oklch(93.7% 0.024 267.9)
-
Step 200
200
#CCD8F9
oklch(88.4% 0.047 269.6)
-
Step 300
300
#ABBFF8
oklch(81% 0.084 269.5)
-
Step 400
400
#7F9BF5
oklch(70.7% 0.136 269.6)
-
Step 500
500
#607FF1
oklch(63% 0.174 269.5)
-
Step 600
600
#4965E0
oklch(55.5% 0.189 269.6)
-
Step 700
700
#3B53C2
oklch(49% 0.175 269.6)
-
Step 800
800 (this color)
#2F439B
oklch(42% 0.145 269.5)
-
Step 900
900
#2A3B7D
oklch(37.7% 0.114 269.4)
-
Step 950
950
#192349
oklch(27% 0.072 270)
#2F439B 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) | #00509E | 0.041 |
| Deuteranopia (no green cones) | #004699 | 0.032 |
| Tritanopia (no blue cones) | #005868 | 0.118 |
| Achromatopsia (no color) | #4B4B4B | 0.145 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2F439B
#2F439B
oklch(42% 0.145 269.5)
- #604A00
#604A00
oklch(42% 0.086 89.1)
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 #2F439B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.029
- Blueberry #464196 ΔE 0.033
- Sapphire #2138AB ΔE 0.042
- Dark Slate Blue #483D8B ΔE 0.044
- Dusk Blue #26538D ΔE 0.052
- Light Navy #155084 ΔE 0.059
- Twilight Blue #0A437A ΔE 0.065
- Twilight #4E518B ΔE 0.068
Use #2F439B 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.