Choosing a Modifier Key

The modifier key is the foundation of your hotkey setup. Choosing the right one affects how natural your shortcuts feel, whether any side effects occur, and whether existing system or app shortcuts remain usable.

How Modifier Blocking Works

To trigger a hotkey cleanly, AppSwitcher must block the modifier key’s own events from reaching Windows and other applications. This is necessary because many modifier keys have built-in side effects when pressed and released on their own.

Without blocking, a hotkey like Apps+B would switch to your browser and trigger the modifier’s side effect at the same time. AppSwitcher prevents this automatically for all modifiers that have known side effects.

Note

Blocking only affects the configured modifier key itself — it does not interfere with any other use of that key outside of AppSwitcher hotkey combinations.

Modifiers with Side Effects

The following modifiers have side effects that AppSwitcher suppresses:

Modifier	Side effect if not blocked	Example without suppression
Apps (Menu key)	Opens a context menu at the cursor	Apps+B switches to browser and shows a context menu
Win	Opens the Windows Start menu	Win+B switches to browser and opens Start
Left Alt	Activates the menu bar in some apps (e.g. File Explorer, Office)	Alt+B switches to browser and triggers a menu in the previously focused app
Caps Lock	Toggles the Caps Lock state	CapsLock+B switches to browser and toggles capitalisation

All of these are currently suppressed by AppSwitcher, so you can use them safely as modifiers without worrying about unwanted side effects. Only the configured modifier is blocked — if you choose Apps as your modifier, the Win key will still function normally and open Start when pressed on its own. Also when modifier alone is pressed, the side effect will still occur (e.g. pressing Apps by itself will open the context menu), but as long as you hold the modifier down while pressing a letter key, the side effect will be blocked.

Modifiers with Hotkey Conflicts

Some modifier keys are so commonly used in existing shortcuts that assigning them as an AppSwitcher modifier will conflict with everyday actions.

Modifier	What you lose	Notes
Ctrl	Ctrl+C, Ctrl+V, Ctrl+Z, Ctrl+S and most app shortcuts	Extremely disruptive — avoid as a sole modifier
Shift	Ability to type uppercase letters with that specific Shift key	The opposite Shift key still works, but muscle memory will break
Left Alt	Alt+F4, Alt+Tab, and app menu navigation	Loses many system shortcuts on top of the side effect above
Right Alt	AltGr combinations (accented characters, symbols on non-US keyboards)	Especially problematic for non-English keyboard layouts. See note below.

Caution

If you use a non-US keyboard layout, avoid Right Alt as a modifier entirely. On many European layouts, AltGr (Right Alt) is required to type common characters such as @, €, [, ], and \.

AltGr Ctrl leak

On layouts where AltGr is active, pressing Right Alt actually simulates Ctrl+Alt at the OS level. AppSwitcher suppresses the Alt part, but the Ctrl modifier leaks through. This means AltGr+A — which would normally type a special character — instead reaches the focused app as Ctrl+A, silently selecting all text. Similar unintended Ctrl+letter shortcuts can fire for any AltGr combination. This is a Windows-level behaviour and cannot be fully worked around by AppSwitcher.

Recommended Modifiers

Caps Lock ✅ Best choice for most users

Caps Lock is present on every keyboard, sits right on the home row, and has no conflicting shortcuts — nothing in Windows or any application uses it as a modifier. Its toggle side effect is suppressed by AppSwitcher when used in a hotkey combination, and brief presses (tap without holding another key) are not suppressed, so it continues to work normally as a capitalisation toggle. The only reason to prefer another option is if you rely on caps lock frequently for typing.

Apps key (Menu key) ✅ Great choice if your keyboard has it

The Apps key has no other purpose — repurposing it as a modifier loses nothing. Its context menu side effect is suppressed by AppSwitcher, and no application uses it in shortcuts. The drawbacks are availability and reach: it is absent on most laptops and any keyboard smaller than full-size, and on keyboards that do have it, it sits on the far right — requiring a significant hand movement away from the home row.

Right Ctrl ✅ Solid fallback

The Right Ctrl key has no side effects and leaves all Left Ctrl shortcuts (Ctrl+C, Ctrl+V, etc.) completely intact. It shares the same availability problem as the Apps key — often absent on compact keyboards — and sits even further right, making it the least ergonomic of the three. It is a reliable choice when Caps Lock is not an option and the Apps key is unavailable.

Shift ⚠️ Usable with care

If you always use just one Shift key for uppercase letters, you could assign the other Shift key as a modifier. This is a bit unconventional and may cause some muscle memory issues, but it can work if you don’t mind the trade-off of losing uppercase letters with that specific Shift key.

Win key ⚠️ Usable with care

The Win key works well as a modifier but many combinations are already claimed by Windows itself (Win+D, Win+E, Win+L, etc.). You can assign some of these combinations if you don’t mind losing the original Windows shortcut, but it’s generally best to choose combos that aren’t already taken by the OS. Also some of them (Win+L) are impossible to override because they are handled at a lower level by Windows. Pressing Win alone will still open the Start menu, but will be blocked when held down with another key for a hotkey.

Summary

Modifier	Safe to use?	Recommendation
Caps Lock	✅ Yes	Best default — home row, universal, no conflicts
Apps	✅ Yes	Excellent if your keyboard has it
Right Ctrl	✅ Yes	Solid fallback; won’t break Left Ctrl shortcuts
Right Shift	✅ Yes	Works well if you only use the other Shift key for uppercase letters
Win	⚠️ Mostly	Avoid combos already claimed by Windows
Right Alt	⚠️ Mostly	Can be problematic on non-US layouts
Left Alt	⚠️ Risky	Side effects suppressed, but many shortcut conflicts
Left Ctrl	❌ Avoid	Loses clipboard and most app shortcuts