Anytime vs Any Time: One Word or Two?

Reviewed by the Grammarlyzer Editorial Team · Our Review Standards · Published January 22, 2026 · Updated July 16, 2026

Adverb vs Noun Phrase in Real Sentences

📌 Quick Answer
Anytime is an adverb meaning at any time. Any time can be a noun phrase, and the open form also has established adverbial use.

Memory Trick: After prepositions like "at" and "for," use any time.

💡 Key Difference

If time is a measurable noun or follows at, keep any time open. In a direct adverbial slot, both spellings may be possible.

Quick Comparison

Form Use It For Quick Check
Anytime an adverb meaning "whenever" Can be replaced by at any time: call anytime / call at any time.
Any time a noun phrase meaning "an amount/point of time" Required after at, for, in: at any time. Accepts "any amount of time."

The Two Tests That Decide It

Use two checks. If the phrase names an amount of available time, keep two words. If at any time replaces an adverbial use, anytime can work, although the open adverbial form is also established.

Sentence What fits Use
Call me ___. "whenever" → call me whenever anytime
Do you have ___ today? "any amount of time" → do you have any time any time
You may cancel at ___. preposition "at" in front any time

Common Mistakes

❌ Incorrect:

Do you have anytime tomorrow?

✓ Correct:

Do you have any time tomorrow?

This asks about an amount of available time — a noun phrase — so two words. You could say "any free time," which only works split.
❌ Incorrect:

You can visit at anytime.

✓ Correct:

You can visit at any time.

The preposition at takes the noun phrase any time as its object.
❌ Incorrect:

I didn't waste anytime getting started.

✓ Correct:

I didn't waste any time getting started.

"Waste" needs an object (a thing), and the thing is "any time" (an amount). The adverb "anytime" can't be wasted, scheduled, or measured.
Open adverbial form:

Stop by any time; you're always welcome.

Closed adverb form:

Stop by anytime; you're always welcome.

Here it means "at any time." The one-word adverb works, but the established open adverbial form is also acceptable, so this is not a useful wrong/correct contrast.

Open and Closed Forms Can Overlap

The open form also has adverbial use

Merriam-Webster documents both Call me anytime and Call me any time. Do not label the open form wrong merely because whenever fits.

The closed adverb means at any time

Use anytime where the single adverb can be replaced by at any time, as in "You can contact me anytime after four."

The whole family doesn't behave the same

Unlike "anytime," the forms any one, any way, and any more change meaning when closed up (anyone, anyway, anymore). See anymore vs any more for that pair.

🎯 Test Your Knowledge

1. Feel free to message me ___.

2. I do not have ___ for extra meetings.

3. You can unsubscribe at ___.

4. Thanks for the help! — Sure, ___!

5. We didn't have ___ to lose before the deadline.

Try It: “Anytime” vs “Any Time”

The question needs the noun phrase any time, but this exact one-word seed produces no checker issue. Use it to practice the noun-versus-adverb analysis.

Manual revision: "Do you have any time tomorrow?"

In our Chromium check, both the quoted seed and its revision with any time received no issue. Decide whether time is a noun in the sentence before relying on the output.

Frequently Asked Questions

Is "anytime" acceptable in emails?

Yes. Use anytime when it means at any time, as in You can reply anytime.

Why is it "at any time" rather than "at anytime"?

At takes the noun phrase any time as its object, so write at any time.

What is a practical first test?

If the phrase names available time or follows at, use any time. If at any time can replace the word, anytime can work as an adverb.

Can the open form "any time" also act adverbially?

Yes. Both Call me anytime and Call me any time are established. The open form is also required when time is a noun, as in Do you have any time?

Deep Dive

Anytime is the closed adverb meaning at any time. Any time is required when the phrase is a quantifiable noun, and the open form also has established adverbial use.

When you can insert "at", "for", or "about", the two-word form normally feels stronger.

Practical Use Cases

This distinction shows up in scheduling, customer support, marketing copy, and everyday conversation.

Context How to Choose
Adverb When "whenever" fits, the closed adverb can work: "You can call anytime." The open adverbial "any time" is also established.
Noun phrase Use "any time" after "at" or when you mean an amount of time: "Do you have any time today?"
Formal writing If the sentence is about availability or duration, the two-word form is often clearer.

Why This Mistake Happens

The one-word form is common in casual writing, but it cannot replace every noun phrase. Prepositions are the strongest clue.

Mini Checklist

  • If "whenever" fits, "anytime" can work.
  • After "at," write "any time."
  • If you mean an amount of time, keep two words.

Editorial Source

The noun-phrase and open/closed adverb distinctions were checked against Merriam-Webster’s anytime/any time usage guide.

You can compare this rule with Prepositions & Spacing and Awhile vs A While.

Related Articles

Apply the Slot Test in Real Drafts

In "Participants may withdraw at any time," the preposition at takes the noun phrase any time. In "Participants may withdraw anytime," the closed form is a single adverb meaning at any time. Both sentences can be correct.

In "Do you have any time tomorrow?" the phrase names available time and can take a modifier such as free. That noun behavior requires the open form.

The Preposition Signal

Check whether the sentence treats time as a thing that can be available, measured, or modified. If so, keep any time open. Otherwise test whether the single adverb can be replaced by at any time.

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