#1F5F99
Closest named color: Denim Blue (#3B5B92). oklch(47.5% 0.113 249.8), rgb(31, 95, 153).
Aa
White text reads best on this color (6.65:1).
About this color
#1F5F99 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 48%, its chroma 0.113 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Denim Blue (#3B5B92), ΔE 0.026 away. White text reads best on it, at 6.65:1.
| Hue family | Blues |
| Lightness | medium-dark (48%) |
| Chroma | moderately saturated (0.113) |
| Temperature | cool |
| Nearest name | Denim Blue (#3B5B92) |
| Black text | 3.15:1 |
| White text | 6.65:1 |
Values
| HEX | #1F5F99 |
| RGB | rgb(31, 95, 153) |
| HSL | hsl(209, 66%, 36%) |
| OKLCH | oklch(47.5% 0.113 249.8) |
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 #1F5F99 | 6.65:1 | AA | Lc -87.6 | Fine for body text |
| Black text on #1F5F99 | 3.15:1 | AA large text | Lc 21.5 | Dividers and decoration only |
| #1F5F99 text on white | 6.65:1 | AA | Lc 82.5 | Fine for body text |
| #1F5F99 text on black | 3.15:1 | AA large text | Lc -19.4 | 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 700.
-
Step 50
50
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E2EBF4
oklch(93.6% 0.016 248)
-
Step 200
200
#CADBED
oklch(88.4% 0.031 249.7)
-
Step 300
300
#A6C4E3
oklch(80.9% 0.055 249.4)
-
Step 400
400
#76A5D6
oklch(70.7% 0.088 250.2)
-
Step 500
500
#508ECB
oklch(63.2% 0.113 249.7)
-
Step 600
600
#3277B7
oklch(55.6% 0.121 249.5)
-
Step 700
700 (this color)
#1F5F99
oklch(47.5% 0.113 249.8)
-
Step 800
800
#205180
oklch(42.6% 0.094 250.2)
-
Step 900
900
#204467
oklch(37.8% 0.073 249.8)
-
Step 950
950
#14283C
oklch(27.1% 0.046 249.9)
#1F5F99 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) | #44629B | 0.037 |
| Deuteranopia (no green cones) | #315798 | 0.025 |
| Tritanopia (no blue cones) | #006D74 | 0.084 |
| Achromatopsia (no color) | #5C5C5C | 0.113 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F5F99
#1F5F99
oklch(47.5% 0.113 249.8)
- #815000
#815000
oklch(47.6% 0.103 69.5)
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 #1F5F99, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim Blue #3B5B92 ΔE 0.026
- Peacock Blue #016795 ΔE 0.027
- Light Navy Blue #2E5A88 ΔE 0.029
- Denim #3B638C ΔE 0.036
- Dusk Blue #26538D ΔE 0.036
- Dusky Blue #475F94 ΔE 0.038
- Mid Blue #276AB3 ΔE 0.050
- Deep Sea Blue #015482 ΔE 0.051
Use #1F5F99 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.