Ten subject lines, one of them right.

Paste the email you have already written. Get ten subject lines for it, from the plain and specific to the one that admits there is a deadline.

Free, no accountTen runs a dayNothing you paste is stored
What went in

We have finished the Q3 workpapers and they are ready for your review.

There are two open items: the intercompany balance and the lease classification.

We need your sign-off by Friday to keep the filing date.

What comes back
  • Q3 workpapers ready, two items need youSpecific, names the ask
  • Review needed by Friday: Q3 workpapersDeadline first
  • Two open items on Q3 before we fileLeads with the blocker
  • Q3 sign-offShort, for a thread already running

The email you wrote, ten ways of announcing it

The workflow

How it works.

  1. STEP 01

    Paste the email

    The body, not a description of it. It writes the subject from what the message actually says.

  2. STEP 02

    Read down the list

    They are deliberately spread out. Plain at one end, urgent at the other, so you can see the range before you pick.

  3. STEP 03

    Pick one and cut it shorter

    The best subject line is usually the one you chose with two words removed.

Worked example

In practice.

What the email was about

A reminder that the client still owes four documents, sent for the third time in two weeks.

What separates the good ones
  • It names the countFour documents beats outstanding items, because a number is a size
  • It does not say reminderThe word tells the reader this is the email they already ignored twice
  • It fits a phoneRoughly forty characters before the preview text takes over
  • It survives a reply chainStill readable with RE: RE: in front of it

Third-chase subject lines are the hard case. The honest version outperforms the polite one, because the polite one looks exactly like the two the reader already skipped.

Where the line sits

This page works on one paste.

The free tool

On demand

  • Ten lines from the email you paste
  • Spread across register and urgency
  • No account, nothing stored, ten runs a day
  • Works for one-off sends and threads alike
Pidgy

Without asking

  • Writes the whole message, subject included
  • Knows which threads have gone quiet
  • Chases them with the tone you pick
  • You press send, always

A subject line is the last five percent of an email. Useful to get right, and not the reason your inbox is full.

Honest limits

Where it does not help.

It is not a marketing tool

These are subject lines for one-to-one professional mail. Campaign subject lines are a different job with different rules.

It cannot A/B test

There is one reader. Pick the line that suits the person rather than the line that tested well somewhere else.

Length limits vary

Roughly forty characters is a safe target, but check how your own client truncates before trusting a long one.

Why it adds up

What email actually costs.

28%

of the workweek goes to reading and answering email, before any of the work inside it gets done.

McKinsey Global Institute
Questions

Answered.

Is it free?

Yes. No account, ten runs a day, and nothing you paste is stored.

Why ten?

Because the useful thing is the spread rather than any single line. Reading the plain one next to the urgent one is usually what decides it.

Are these for newsletters?

No. They are for one-to-one professional email. Campaign subject lines are optimised against open rates across thousands of readers, which is a different problem.

Should the subject change on a reply?

Sometimes. If the thread has moved to a different question, a fresh subject helps everyone find it later.

Subject lines are the small part.

Pidgy reads the whole inbox, ranks what matters, drafts the replies and chases what is slipping.