diff --git a/packages/mobile/__tests__/CountdownCircleTimer.test.js b/packages/mobile/__tests__/CountdownCircleTimer.test.js
index 26e6a90..5390007 100644
--- a/packages/mobile/__tests__/CountdownCircleTimer.test.js
+++ b/packages/mobile/__tests__/CountdownCircleTimer.test.js
@@ -9,7 +9,11 @@ Math.random = () => 0.124578
 
 const fixture = {
   duration: 10,
-  colors: [['#004777', 0.33], ['#F7B801', 0.33], ['#A30000']],
+  colors: [
+    ['#004777', 0.33],
+    ['#F7B801', 0.33],
+    ['#A30000', 0.33],
+  ],
 }
 
 describe('snapshot tests', () => {
@@ -37,7 +41,19 @@ describe('snapshot tests', () => {
   it('renders with single color', () => {
     const tree = renderer
       .create(
-        <CountdownCircleTimer duration={5} colors={[['#004777']]}>
+        <CountdownCircleTimer duration={5} colors={[['#004777', 1]]}>
+          {({ remainingTime }) => <Text>{remainingTime}</Text>}
+        </CountdownCircleTimer>
+      )
+      .toJSON()
+
+    expect(tree).toMatchSnapshot()
+  })
+
+  it('renders with single color provided as a string', () => {
+    const tree = renderer
+      .create(
+        <CountdownCircleTimer duration={5} colors="#004777">
           {({ remainingTime }) => <Text>{remainingTime}</Text>}
         </CountdownCircleTimer>
       )
@@ -51,7 +67,10 @@ describe('snapshot tests', () => {
       .create(
         <CountdownCircleTimer
           duration={5}
-          colors={[['#004777', 0.4], ['#aabbcc']]}
+          colors={[
+            ['#004777', 0.4],
+            ['#aabbcc', 0.6],
+          ]}
           isLinearGradient
         >
           {({ remainingTime }) => <Text>{remainingTime}</Text>}
@@ -74,10 +93,11 @@ describe('functional tests', () => {
     expect(getByText('4')).toBeTruthy()
   })
 
-  it('should display 0 at the end of the countdown', () => {
+  it('should call onComplete at the end of the countdown', () => {
     global.withAnimatedTimeTravelEnabled(() => {
+      const onComplete = jest.fn()
       const { getByText } = render(
-        <CountdownCircleTimer {...fixture} isPlaying>
+        <CountdownCircleTimer {...fixture} isPlaying onComplete={onComplete}>
           {({ remainingTime }) => <Text>{remainingTime}</Text>}
         </CountdownCircleTimer>
       )
@@ -87,6 +107,7 @@ describe('functional tests', () => {
       })
 
       expect(getByText('0')).toBeTruthy()
+      expect(onComplete).toHaveBeenCalledWith(10)
     })
   })
 })
@@ -145,7 +166,6 @@ describe('behaviour tests', () => {
 
   it('should clear repeat timeout when the component is unmounted', () => {
     const clearTimeoutMock = jest.fn()
-    const cancelAnimationFrameMock = jest.fn()
 
     global.clearTimeout = clearTimeoutMock
 
diff --git a/packages/mobile/__tests__/__snapshots__/CountdownCircleTimer.test.js.snap b/packages/mobile/__tests__/__snapshots__/CountdownCircleTimer.test.js.snap
index 4fb6a24..3567328 100644
--- a/packages/mobile/__tests__/__snapshots__/CountdownCircleTimer.test.js.snap
+++ b/packages/mobile/__tests__/__snapshots__/CountdownCircleTimer.test.js.snap
@@ -303,6 +303,105 @@ exports[`snapshot tests renders with single color 1`] = `
 </View>
 `;
 
+exports[`snapshot tests renders with single color provided as a string 1`] = `
+<View
+  accessibilityLabel="Countdown timer"
+  accessible={true}
+  style={
+    Object {
+      "height": 180,
+      "position": "relative",
+      "width": 180,
+    }
+  }
+>
+  <RNSVGSvgView
+    bbHeight={180}
+    bbWidth={180}
+    focusable={false}
+    height={180}
+    style={
+      Array [
+        Object {
+          "backgroundColor": "transparent",
+          "borderWidth": 0,
+        },
+        Object {
+          "flex": 0,
+          "height": 180,
+          "width": 180,
+        },
+      ]
+    }
+    width={180}
+  >
+    <RNSVGGroup>
+      <RNSVGPath
+        d="m 90,6
+          a 84,84 0 1,0 0,168
+          a 84,84 0 1,0 0,-168"
+        fill={null}
+        propList={
+          Array [
+            "fill",
+            "stroke",
+            "strokeWidth",
+          ]
+        }
+        stroke={4292467161}
+        strokeWidth={12}
+      />
+      <RNSVGPath
+        d="m 90,6
+          a 84,84 0 1,0 0,168
+          a 84,84 0 1,0 0,-168"
+        fill={null}
+        propList={
+          Array [
+            "fill",
+            "stroke",
+            "strokeWidth",
+            "strokeDasharray",
+            "strokeDashoffset",
+            "strokeLinecap",
+          ]
+        }
+        stroke={4278208375}
+        strokeDasharray={
+          Array [
+            527.7875658030853,
+            527.7875658030853,
+          ]
+        }
+        strokeDashoffset={null}
+        strokeLinecap={1}
+        strokeWidth={12}
+      />
+    </RNSVGGroup>
+  </RNSVGSvgView>
+  <View
+    accessibilityElementsHidden={true}
+    importantForAccessibility="no-hide-descendants"
+    style={
+      Object {
+        "alignItems": "center",
+        "display": "flex",
+        "height": "100%",
+        "justifyContent": "center",
+        "left": 0,
+        "position": "absolute",
+        "top": 0,
+        "width": "100%",
+      }
+    }
+  >
+    <Text>
+      5
+    </Text>
+  </View>
+</View>
+`;
+
 exports[`snapshot tests renders with time 1`] = `
 <View
   accessibilityLabel="Countdown timer"
diff --git a/packages/mobile/src/utils/getStroke.js b/packages/mobile/src/utils/getStroke.js
index a6c8282..0632bb3 100644
--- a/packages/mobile/src/utils/getStroke.js
+++ b/packages/mobile/src/utils/getStroke.js
@@ -3,8 +3,11 @@ export const getStroke = ({
   animatedElapsedTime,
   durationMilliseconds,
 }) => {
-  const colorsLength = colors.length
+  if (typeof colors === 'string') {
+    return colors
+  }
 
+  const colorsLength = colors.length
   if (colorsLength === 1) {
     return colors[0][0]
   }
diff --git a/packages/mobile/types/CountdownCircleTimer.d.ts b/packages/mobile/types/CountdownCircleTimer.d.ts
index 9591d83..ee7e758 100644
--- a/packages/mobile/types/CountdownCircleTimer.d.ts
+++ b/packages/mobile/types/CountdownCircleTimer.d.ts
@@ -20,8 +20,8 @@ type Colors = {
 export interface CountdownCircleTimerProps {
   /** Countdown duration in seconds */
   duration: number
-  /** Array of tuples: 1st param - color in HEX format; 2nd param - time to transition to next color represented as a fraction of the total duration */
-  colors: Colors
+  /** Single color as a string or an array of tuples: 1st param - color in HEX format; 2nd param - time to transition to next color represented as a fraction of the total duration */
+  colors: string | Colors
   /** Set the initial remaining time if it is different than the duration */
   initialRemainingTime?: number
   /** Width and height of the SVG element. Default: 180 */
diff --git a/packages/shared/components/DefsLinearGradient.jsx b/packages/shared/components/DefsLinearGradient.jsx
index 1d829ce..30120d8 100644
--- a/packages/shared/components/DefsLinearGradient.jsx
+++ b/packages/shared/components/DefsLinearGradient.jsx
@@ -3,8 +3,10 @@ import PropTypes from 'prop-types'
 import { countdownCircleTimerProps } from '..'
 
 const getStopProps = (colors) => {
-  if (colors.length === 1) {
-    return [{ offset: 1, stopColor: colors[0][0], key: 0 }]
+  const isColorsString = typeof colors === 'string'
+  if (isColorsString || colors.length === 1) {
+    const stopColor = isColorsString ? colors : colors[0][0]
+    return [{ offset: 1, stopColor, key: 0 }]
   }
 
   const colorsLength = colors.length
diff --git a/packages/shared/utils/colorsValidator.js b/packages/shared/utils/colorsValidator.js
index 3be3a01..d2fdac2 100644
--- a/packages/shared/utils/colorsValidator.js
+++ b/packages/shared/utils/colorsValidator.js
@@ -1,22 +1,43 @@
-export const colorsValidator = (
-  propValue,
-  key,
-  componentName,
-  location,
-  propFullName
-) => {
-  const color = propValue[0]
-  const duration = propValue[1]
+const isHexColor = (color) => color.match(/^#([A-Fa-f0-9]{6}|[A-Fa-f0-9]{3})$/)
+const getErrorInProp = (propName, componentName) =>
+  `Invalid prop '${propName}' supplied to '${componentName}'`
+const getHexColorError = (propName, componentName, type = 'array') =>
+  new Error(
+    `${getErrorInProp(propName, componentName)}. Expect ${
+      type === 'array' ? 'an array of tuples where the first element is a' : ''
+    } HEX color code string.
+ .`
+  )
 
-  if (!color.match(/^#([A-Fa-f0-9]{6}|[A-Fa-f0-9]{3})$/)) {
-    return new Error(
-      `Invalid prop '${propFullName}[0]' supplied to '${componentName}'.Expect a color with HEX color code.`
-    )
+const validateColorsAsString = (colors, propName, componentName) => {
+  if (!isHexColor(colors)) {
+    return getHexColorError(propName, componentName, 'string')
   }
+}
+
+const validateColorsAsArray = (colors, propName, componentName) => {
+  for (let index = 0; index < colors.length; index += 1) {
+    const color = colors[index][0]
+    const duration = colors[index][1]
 
-  if (!(duration === undefined || (duration >= 0 && duration <= 1))) {
-    return new Error(
-      `Invalid prop '${propFullName}[1]' supplied to '${componentName}'. Expect a number of color transition duration with value between 0 and 1.`
-    )
+    if (!isHexColor(color)) {
+      return getHexColorError(propName, componentName)
+    }
+
+    if (!(duration === undefined || (duration >= 0 && duration <= 1))) {
+      return new Error(
+        `${getErrorInProp(propName, componentName)}.
+        Expect an array of tuples where the second element is a number between 0 and 1 representing color transition duration.`
+      )
+    }
   }
 }
+
+export const colorsValidator = (props, propName, componentName) => {
+  const colors = props[propName]
+  if (typeof colors === 'string') {
+    return validateColorsAsString(colors, propName, componentName)
+  }
+
+  return validateColorsAsArray(colors, propName, componentName)
+}
diff --git a/packages/shared/utils/countdownCircleTimerProps.js b/packages/shared/utils/countdownCircleTimerProps.js
index d7c46e6..cb15d85 100644
--- a/packages/shared/utils/countdownCircleTimerProps.js
+++ b/packages/shared/utils/countdownCircleTimerProps.js
@@ -3,8 +3,7 @@ import { colorsValidator } from '.'
 
 export const countdownCircleTimerProps = {
   duration: PropTypes.number.isRequired,
-  colors: PropTypes.arrayOf(PropTypes.arrayOf(colorsValidator).isRequired)
-    .isRequired,
+  colors: colorsValidator,
   children: PropTypes.oneOfType([PropTypes.func, PropTypes.node]),
   size: PropTypes.number,
   strokeWidth: PropTypes.number,
diff --git a/packages/web/__tests__/CountdownCircleTimer.test.js b/packages/web/__tests__/CountdownCircleTimer.test.js
index 1352579..f5c864b 100644
--- a/packages/web/__tests__/CountdownCircleTimer.test.js
+++ b/packages/web/__tests__/CountdownCircleTimer.test.js
@@ -11,7 +11,11 @@ const useElapsedTime = require('use-elapsed-time')
 
 const fixture = {
   duration: 10,
-  colors: [['#004777', 0.33], ['#F7B801', 0.33], ['#A30000']],
+  colors: [
+    ['#004777', 0.33],
+    ['#F7B801', 0.33],
+    ['#A30000', 0.33],
+  ],
 }
 
 describe('snapshot tests', () => {
@@ -170,7 +174,7 @@ describe('functional tests', () => {
     expect(path).toHaveAttribute('stroke', 'rgba(163, 0, 0, 1)')
   })
 
-  it('should the same color at the beginning and end of the animation if only one color is provided', () => {
+  it('should the same color at the beginning and end of the animation if only one color in an array of colors is provided', () => {
     useElapsedTime.__setElapsedTime(0)
 
     const expectedPathProps = ['stroke', 'rgba(0, 71, 119, 1)']
@@ -189,6 +193,25 @@ describe('functional tests', () => {
     expect(pathEnd).toHaveAttribute(...expectedPathProps)
   })
 
+  it('should the same color at the beginning and end of the animation if only one color as a string is provided', () => {
+    useElapsedTime.__setElapsedTime(0)
+
+    const expectedPathProps = ['stroke', 'rgba(0, 71, 119, 1)']
+    const component = () => (
+      <CountdownCircleTimer {...fixture} colors="#004777" />
+    )
+    const { container, rerender } = render(component())
+
+    const pathBeginning = container.querySelectorAll('path')[1]
+    expect(pathBeginning).toHaveAttribute(...expectedPathProps)
+
+    useElapsedTime.__setElapsedTime(10)
+    rerender(component())
+
+    const pathEnd = container.querySelectorAll('path')[1]
+    expect(pathEnd).toHaveAttribute(...expectedPathProps)
+  })
+
   it('should transition colors for which the durations sums up to 1', () => {
     useElapsedTime.__setElapsedTime(0)
 
diff --git a/packages/web/src/utils/colors.js b/packages/web/src/utils/colors.js
index 3908033..987121d 100644
--- a/packages/web/src/utils/colors.js
+++ b/packages/web/src/utils/colors.js
@@ -48,7 +48,8 @@ const getColorsBase = (colors, isGradient) => {
 }
 
 export const getNormalizedColors = (colors, duration, isGradient) => {
-  const colorsBase = getColorsBase(colors, isGradient)
+  const allColors = typeof colors === 'string' ? [[colors, 1]] : colors
+  const colorsBase = getColorsBase(allColors, isGradient)
   let colorsTotalDuration = 0
 
   return colorsBase.map((color, index) => {
diff --git a/packages/web/types/CountdownCircleTimer.d.ts b/packages/web/types/CountdownCircleTimer.d.ts
index 61582fc..9053acd 100644
--- a/packages/web/types/CountdownCircleTimer.d.ts
+++ b/packages/web/types/CountdownCircleTimer.d.ts
@@ -17,8 +17,8 @@ type Colors = {
 export interface CountdownCircleTimerProps {
   /** Countdown duration in seconds */
   duration: number
-  /** Array of tuples: 1st param - color in HEX format; 2nd param - time to transition to next color represented as a fraction of the total duration */
-  colors: Colors
+  /** Single color as a string or an array of tuples: 1st param - color in HEX format; 2nd param - time to transition to next color represented as a fraction of the total duration */
+  colors: string | Colors
   /** Set the initial remaining time if it is different than the duration */
   initialRemainingTime?: number
   /** Width and height of the SVG element. Default: 180 */