#1D99D5
Closest named color: Dark Sky Blue (#448EE4). oklch(64.8% 0.134 236.8), rgb(29, 153, 213).
Aa
Black text reads best on this color (6.56:1).
About this color
#1D99D5 is a medium-light, moderately saturated blue. In OKLCH its lightness is 65%, its chroma 0.134 and its hue 237°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.045 away. Black text reads best on it, at 6.56:1.
| Hue family | Blues |
| Lightness | medium-light (65%) |
| Chroma | moderately saturated (0.134) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.56:1 |
| White text | 3.19:1 |
Values
| HEX | #1D99D5 |
| RGB | rgb(29, 153, 213) |
| HSL | hsl(200, 76%, 47%) |
| OKLCH | oklch(64.8% 0.134 236.8) |
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 #1D99D5 | 3.19:1 | AA large text | Lc -64.1 | Content text, not long reading |
| Black text on #1D99D5 | 6.56:1 | AA | Lc 45.4 | Large or bold text, headings |
| #1D99D5 text on white | 3.19:1 | AA large text | Lc 58.6 | Large or bold text, headings |
| #1D99D5 text on black | 6.56:1 | AA | Lc -43.1 | Non-text elements, placeholder text |
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 500.
-
Step 50
50
#F0F6FB
oklch(97% 0.009 242.8)
-
Step 100
100
#DFECF5
oklch(93.6% 0.018 237.8)
-
Step 200
200
#C3DDEF
oklch(88.4% 0.037 238.1)
-
Step 300
300
#99C8E6
oklch(81% 0.065 236.6)
-
Step 400
400
#5AAADA
oklch(70.7% 0.105 237.2)
-
Step 500
500 (this color)
#1D99D5
oklch(64.8% 0.134 236.8)
-
Step 600
600
#007CB1
oklch(55.6% 0.122 237.2)
-
Step 700
700
#006895
oklch(49% 0.107 237)
-
Step 800
800
#00557B
oklch(42.6% 0.093 237.2)
-
Step 900
900
#004767
oklch(37.7% 0.082 236.6)
-
Step 950
950
#032A3E
oklch(27% 0.056 236.7)
#1D99D5 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) | #7C99D8 | 0.076 |
| Deuteranopia (no green cones) | #6489D4 | 0.061 |
| Tritanopia (no blue cones) | #00A8AE | 0.084 |
| Achromatopsia (no color) | #909090 | 0.134 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1D99D5
#1D99D5
oklch(64.8% 0.134 236.8)
- #CA7730
#CA7730
oklch(64.8% 0.133 57.3)
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 #1D99D5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.045
- Chefchaouen Blue #4895EF ΔE 0.050
- Water Blue #0E87CC ΔE 0.052
- Faded Blue #658CBB ΔE 0.062
- Blue NCS #118AB2 ΔE 0.063
- Cool Blue #4984B8 ΔE 0.065
- Cornflower Blue #6495ED ΔE 0.065
- Steel Blue #4682B4 ΔE 0.071
Use #1D99D5 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.