#2F3F99
Closest named color: Cobalt (#1E488F). oklch(41.1% 0.148 270.8), rgb(47, 63, 153).
Aa
White text reads best on this color (9.16:1).
About this color
#2F3F99 is a dark, vivid blue. In OKLCH its lightness is 41%, its chroma 0.148 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.033 away. White text reads best on it, at 9.16:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | vivid (0.148) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.29:1 |
| White text | 9.16:1 |
Values
| HEX | #2F3F99 |
| RGB | rgb(47, 63, 153) |
| HSL | hsl(231, 53%, 39%) |
| OKLCH | oklch(41.1% 0.148 270.8) |
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 #2F3F99 | 9.16:1 | AAA | Lc -95.1 | Preferred for body text |
| Black text on #2F3F99 | 2.29:1 | Fails | Lc 13.3 | Not readable |
| #2F3F99 text on white | 9.16:1 | AAA | Lc 90.7 | Preferred for body text |
| #2F3F99 text on black | 2.29:1 | Fails | Lc -11.6 | 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
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E3E9FB
oklch(93.5% 0.025 271.1)
-
Step 200
200
#CDD8FA
oklch(88.5% 0.048 271.2)
-
Step 300
300
#ACBEF9
oklch(80.9% 0.086 271.2)
-
Step 400
400
#819AF6
oklch(70.6% 0.138 271)
-
Step 500
500
#637EF3
oklch(63.1% 0.177 270.8)
-
Step 600
600
#4C64E1
oklch(55.6% 0.191 270.7)
-
Step 700
700
#3E52C4
oklch(49.1% 0.178 270.8)
-
Step 800
800 (this color)
#2F3F99
oklch(41.1% 0.148 270.8)
-
Step 900
900
#2C3A7E
oklch(37.7% 0.116 271.1)
-
Step 950
950
#1A234A
oklch(27.1% 0.073 271.1)
#2F3F99 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) | #004D9C | 0.043 |
| Deuteranopia (no green cones) | #004397 | 0.034 |
| Tritanopia (no blue cones) | #005565 | 0.121 |
| Achromatopsia (no color) | #484848 | 0.148 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2F3F99
#2F3F99
oklch(41.1% 0.148 270.8)
- #5C4800
#5C4800
oklch(41.1% 0.084 90.5)
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 #2F3F99, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.033
- Blueberry #464196 ΔE 0.034
- Sapphire #2138AB ΔE 0.038
- Dark Slate Blue #483D8B ΔE 0.043
- Dusk Blue #26538D ΔE 0.060
- Twilight Blue #0A437A ΔE 0.063
- Light Navy #155084 ΔE 0.064
- Blue Blue #2242C7 ΔE 0.075
Use #2F3F99 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.