diff --git a/apps/client/src/features/app-settings/panel/automations-panel/AutomationForm.tsx b/apps/client/src/features/app-settings/panel/automations-panel/AutomationForm.tsx
index 80ba21a4c..312b7ee28 100644
--- a/apps/client/src/features/app-settings/panel/automations-panel/AutomationForm.tsx
+++ b/apps/client/src/features/app-settings/panel/automations-panel/AutomationForm.tsx
@@ -25,6 +25,7 @@ import { preventEscape } from '../../../../common/utils/keyEvent';
 import { startsWithHttp } from '../../../../common/utils/regex';
 import * as Panel from '../../panel-utils/PanelUtils';
 
+import TemplateInput from './template-input/TemplateInput';
 import { isAutomation, makeFieldList } from './automationUtils';
 
 import style from './AutomationForm.module.scss';
@@ -357,7 +358,7 @@ export default function AutomationForm(props: AutomationFormProps) {
                   </label>
                   <label>
                     Parameters
-                    <Input
+                    <TemplateInput
                       {...register(`outputs.${index}.args`)}
                       variant='ontime-filled'
                       size='sm'
diff --git a/apps/client/src/features/app-settings/panel/automations-panel/template-input/TemplateInput.module.scss b/apps/client/src/features/app-settings/panel/automations-panel/template-input/TemplateInput.module.scss
new file mode 100644
index 000000000..47dccd013
--- /dev/null
+++ b/apps/client/src/features/app-settings/panel/automations-panel/template-input/TemplateInput.module.scss
@@ -0,0 +1,29 @@
+.wrapper {
+  position: relative;
+}
+
+.suggestions {
+  background: $gray-1250;
+  color: $ui-white;
+
+  position: absolute;
+  top: 100%;
+  left: 0;
+  width: 100%;
+  margin: 0;
+  z-index: 5;
+  padding-block: 0.25rem;
+
+  max-height: 200px;
+  overflow-y: auto;
+  color: $label-gray;
+
+  li {
+    padding: 0.25rem;
+  }
+
+  li:hover {
+    color: $ui-white;
+    background: $blue-700;
+  }
+}
diff --git a/apps/client/src/features/app-settings/panel/automations-panel/template-input/TemplateInput.tsx b/apps/client/src/features/app-settings/panel/automations-panel/template-input/TemplateInput.tsx
new file mode 100644
index 000000000..0b8287f1a
--- /dev/null
+++ b/apps/client/src/features/app-settings/panel/automations-panel/template-input/TemplateInput.tsx
@@ -0,0 +1,70 @@
+import { useMemo, useState } from 'react';
+import { type InputProps, Input } from '@chakra-ui/react';
+import { useClickOutside } from '@mantine/hooks';
+
+import useCustomFields from '../../../../../common/hooks-query/useCustomFields';
+
+import { makeAutoCompleteList, matchRemaining, selectFromLastTemplate } from './templateInput.utils';
+
+import style from './TemplateInput.module.scss';
+
+interface TemplateInputProps extends InputProps {}
+
+export default function TemplateInput(props: TemplateInputProps) {
+  const { value, onChange, ...rest } = props;
+  const { data } = useCustomFields();
+  const ref = useClickOutside(() => setShowSuggestions(false));
+
+  const autocompleteList = useMemo(() => {
+    return makeAutoCompleteList(data);
+  }, [data]);
+
+  const [inputValue, setInputValue] = useState(value || '');
+  const [suggestions, setSuggestions] = useState<string[]>([]);
+  const [showSuggestions, setShowSuggestions] = useState(false);
+
+  const updateSuggestions = (value: string) => {
+    const template = selectFromLastTemplate(value);
+    return autocompleteList.filter((suggestion) => suggestion.startsWith(template));
+  };
+
+  const handleInputChange = (event: React.ChangeEvent<HTMLInputElement>) => {
+    setInputValue(event.target.value);
+
+    if (event.target.value.endsWith('{{')) {
+      setShowSuggestions(true);
+    } else if (event.target.value === '' || event.target.value.endsWith('}}')) {
+      setShowSuggestions(false);
+    }
+
+    if (showSuggestions) {
+      const suggestions = updateSuggestions(event.target.value);
+      setSuggestions(suggestions);
+    }
+
+    onChange?.(event);
+  };
+
+  const handleSuggestion = (value: string) => {
+    setInputValue((prev) => {
+      const remaining = matchRemaining(prev as string, value);
+      return prev + remaining;
+    });
+    setShowSuggestions(false);
+  };
+
+  return (
+    <div className={style.wrapper} ref={ref}>
+      <Input {...rest} value={inputValue} onChange={handleInputChange} autoComplete='off' autoCorrect='off' />
+      {showSuggestions && suggestions.length > 0 && (
+        <ul className={style.suggestions}>
+          {suggestions.map((suggestion) => (
+            <li key={suggestion} onClick={() => handleSuggestion(suggestion)}>
+              {suggestion}
+            </li>
+          ))}
+        </ul>
+      )}
+    </div>
+  );
+}
diff --git a/apps/client/src/features/app-settings/panel/automations-panel/template-input/__tests__/templateInput.utils.test.ts b/apps/client/src/features/app-settings/panel/automations-panel/template-input/__tests__/templateInput.utils.test.ts
new file mode 100644
index 000000000..298e818b0
--- /dev/null
+++ b/apps/client/src/features/app-settings/panel/automations-panel/template-input/__tests__/templateInput.utils.test.ts
@@ -0,0 +1,19 @@
+import { matchRemaining } from '../templateInput.utils';
+
+describe('matchRemaining()', () => {
+  it('should return a partial string needed for autocomplete', () => {
+    expect(matchRemaining('te', 'test')).toBe('st');
+    expect(matchRemaining('{{{hum', '{{human}}')).toBe('an}}');
+    expect(matchRemaining('send {', '{{human}}')).toBe('{human}}');
+
+    // we should be able to match the following
+    // however, the current implementation only needs to deal with strings that start with {{
+    // expect(matchRemaining('{', '{{human}}')).toBe('{human}}');
+    // expect(matchRemaining('{{', '{{human}}')).toBe('human}}');
+  });
+
+  it('should return an empty string if there are no matches or if it is complete', () => {
+    expect(matchRemaining('test', 'another')).toBe('');
+    expect(matchRemaining('test', 'test')).toBe('');
+  });
+});
diff --git a/apps/client/src/features/app-settings/panel/automations-panel/template-input/templateInput.utils.ts b/apps/client/src/features/app-settings/panel/automations-panel/template-input/templateInput.utils.ts
new file mode 100644
index 000000000..7379d24b8
--- /dev/null
+++ b/apps/client/src/features/app-settings/panel/automations-panel/template-input/templateInput.utils.ts
@@ -0,0 +1,105 @@
+import { CustomFields } from 'ontime-types';
+
+const humanConstants = [
+  '{{human.clock}}',
+  '{{human.duration}}',
+  '{{human.expectedEnd}}',
+  '{{human.runningTimer}}',
+  '{{human.elapsedTime}}',
+  '{{human.startedAt}}',
+];
+
+const staticAutocompleteOptions = [
+  '{{clock}}',
+  '{{timer.addedTime}}',
+  '{{timer.current}}',
+  '{{timer.duration}}',
+  '{{timer.elapsed}}',
+  '{{timer.expectedFinish}}',
+  '{{timer.finishedAt}}',
+  '{{timer.secondaryTimer}}',
+  '{{timer.startedAt}}',
+  '{{runtime.selectedEventIndex}}',
+  '{{runtime.numEvents}}',
+  '{{runtime.offset}}',
+  '{{runtime.plannedStart}}',
+  '{{runtime.plannedEnd}}',
+  '{{runtime.actualStart}}',
+  '{{runtime.expectedEnd}}',
+  '{{currentBlock.block}}',
+  '{{currentBlock.startedAt}}',
+];
+
+const eventStaticPropertiesNow = [
+  '{{eventNow.id}}',
+  '{{eventNow.cue}}',
+  '{{eventNow.title}}',
+  '{{eventNow.note}}',
+  '{{eventNow.timeStart}}',
+  '{{eventNow.timeEnd}}',
+  '{{eventNow.duration}}',
+  '{{eventNow.isPublic}}',
+  '{{eventNow.colour}}',
+  '{{eventNow.delay}}',
+];
+
+const eventStaticPropertiesNext = [
+  '{{eventNext.id}}',
+  '{{eventNext.cue}}',
+  '{{eventNext.title}}',
+  '{{eventNext.note}}',
+  '{{eventNext.timeStart}}',
+  '{{eventNext.timeEnd}}',
+  '{{eventNext.duration}}',
+  '{{eventNext.isPublic}}',
+  '{{eventNext.colour}}',
+  '{{eventNext.delay}}',
+];
+
+/**
+ * Creates a it of possible autocomplete suggestions
+ * Based on RuntimeState
+ * Appends the human readable variants to it
+ * It is manually kept in sync with the automation parseTemplate functions
+ */
+export function makeAutoCompleteList(customFields: CustomFields): string[] {
+  return [
+    ...humanConstants,
+    ...staticAutocompleteOptions,
+    ...eventStaticPropertiesNow,
+    ...Object.entries(customFields).map(([key]) => `{{eventNow.custom.${key}}}`),
+    ...eventStaticPropertiesNext,
+    ...Object.entries(customFields).map(([key]) => `{{eventNext.custom.${key}}}`),
+  ];
+}
+
+/**
+ * Returns the partial string b needed to autocomplete string a
+ * @example matchRemaining('te', 'test') -> 'st'
+ * @example matchRemaining('{{', '{{human}}') -> 'man}}'
+ */
+export function matchRemaining(a: string, b: string) {
+  if (a === b) {
+    return '';
+  }
+
+  for (let i = 0; i < b.length; i++) {
+    const searchString = b.substring(0, i + 1);
+    if (a.endsWith(searchString)) {
+      return b.substring(i + 1);
+    }
+  }
+
+  return '';
+}
+
+/**
+ * Selects the last starting template in a string
+ */
+export function selectFromLastTemplate(text: string) {
+  const lastBraceIndex = text.lastIndexOf('{{');
+  if (lastBraceIndex !== -1) {
+    return text.slice(lastBraceIndex);
+  }
+  return '';
+}
diff --git a/apps/server/src/stores/runtimeState.ts b/apps/server/src/stores/runtimeState.ts
index 2173b7538..f2a311807 100644
--- a/apps/server/src/stores/runtimeState.ts
+++ b/apps/server/src/stores/runtimeState.ts
@@ -8,6 +8,7 @@ import {
   PlayableEvent,
   Playback,
   Runtime,
+  runtimeStorePlaceholder,
   TimerPhase,
   TimerState,
 } from 'ontime-types';
@@ -32,29 +33,6 @@ import {
 import { timerConfig } from '../config/config.js';
 import { loadRoll, normaliseRollStart } from '../services/rollUtils.js';
 
-const initialRuntime: Runtime = {
-  selectedEventIndex: null, // changes if rundown changes or we load a new event
-  numEvents: 0, // change initiated by user
-  offset: 0, // changes at runtime
-  plannedStart: 0, // only changes if event changes
-  plannedEnd: 0, // only changes if event changes, overflows over dayInMs
-  actualStart: null, // set once we start the timer
-  expectedEnd: null, // changes with runtime, based on offset, overflows over dayInMs
-} as const;
-
-const initialTimer: TimerState = {
-  addedTime: 0,
-  current: null, // changes on every update
-  duration: null, // only changes if event changes
-  elapsed: null, // changes on every update
-  expectedFinish: null, // change can only be initiated by user, can roll over midnight
-  finishedAt: null, // can change on update or user action
-  phase: TimerPhase.None, // can change on update or user action
-  playback: Playback.Stop, // change initiated by user
-  secondaryTimer: null, // change on every update
-  startedAt: null, // change can only be initiated by user
-} as const;
-
 export type RuntimeState = {
   clock: number; // realtime clock
   eventNow: PlayableEvent | null;
@@ -75,16 +53,13 @@ export type RuntimeState = {
 
 const runtimeState: RuntimeState = {
   clock: clock.timeNow(),
-  currentBlock: {
-    block: null,
-    startedAt: null,
-  },
+  currentBlock: { ...runtimeStorePlaceholder.currentBlock },
   eventNow: null,
   publicEventNow: null,
   eventNext: null,
   publicEventNext: null,
-  runtime: { ...initialRuntime },
-  timer: { ...initialTimer },
+  runtime: { ...runtimeStorePlaceholder.runtime },
+  timer: { ...runtimeStorePlaceholder.timer },
   _timer: {
     forceFinish: null,
     totalDelay: 0,
@@ -124,7 +99,7 @@ export function clear() {
 
   runtimeState.timer.playback = Playback.Stop;
   runtimeState.clock = clock.timeNow();
-  runtimeState.timer = { ...initialTimer };
+  runtimeState.timer = { ...runtimeStorePlaceholder.timer };
 
   // when clearing, we maintain the total delay from the rundown
   runtimeState._timer.forceFinish = null;
diff --git a/packages/types/src/definitions/runtime/RuntimeStore.ts b/packages/types/src/definitions/runtime/RuntimeStore.ts
index bed1a8229..e9674ace4 100644
--- a/packages/types/src/definitions/runtime/RuntimeStore.ts
+++ b/packages/types/src/definitions/runtime/RuntimeStore.ts
@@ -7,15 +7,15 @@ export const runtimeStorePlaceholder: RuntimeStore = {
   clock: 0,
   timer: {
     addedTime: 0,
-    current: null,
-    duration: null,
-    elapsed: null,
-    expectedFinish: null,
-    finishedAt: null,
-    phase: TimerPhase.None,
-    playback: Playback.Stop,
-    secondaryTimer: null,
-    startedAt: null,
+    current: null, // changes on every update
+    duration: null, // only changes if event changes
+    elapsed: null, // changes on every update
+    expectedFinish: null, // change can only be initiated by user, can roll over midnight
+    finishedAt: null, // can change on update or user action
+    phase: TimerPhase.None, // can change on update or user action
+    playback: Playback.Stop, // change initiated by user
+    secondaryTimer: null, // change on every update
+    startedAt: null, // change can only be initiated by user
   },
   onAir: false,
   message: {
@@ -29,13 +29,13 @@ export const runtimeStorePlaceholder: RuntimeStore = {
     external: '',
   },
   runtime: {
-    selectedEventIndex: null,
-    numEvents: 0,
-    offset: 0,
-    plannedStart: 0,
-    plannedEnd: 0,
-    actualStart: null,
-    expectedEnd: null,
+    selectedEventIndex: null, // changes if rundown changes or we load a new event
+    numEvents: 0, // change initiated by user
+    offset: 0, // changes at runtime
+    plannedStart: 0, // only changes if event changes
+    plannedEnd: 0, // only changes if event changes, overflows over dayInMs
+    actualStart: null, // set once we start the timer
+    expectedEnd: null, // changes with runtime, based on offset, overflows over dayInMs
   },
   currentBlock: {
     block: null,