None of the four big apps requires it. Bumble has the reputation for it, but its own help center says both people get one opening message, and the chat opens once the other person replies. Tinder, Hinge and OkCupid let either person start. On every one of them, a man who waits for her to go first risks a match that goes nowhere.

How each app starts a chat

Here is what each app's help pages say about who can write and when.

BumbleTinderHingeOkCupid
Who can write firstEither person, one opening message eachEither personEither personEither person
When chatting startsThe chat opens once the other person replies to the opening messageAfter you have matchedAfter the match, which begins with a like or comment on part of a cardOnce two people like each other
Does it require her to startNoNoNoNo

The details differ, but the rule about her is the same everywhere. The app never makes her do it.

Bumble is the one men get wrong

Bumble built its name on the woman making the first move, and plenty of men still believe she must write first.

Its help center describes something else. Each person has a limited window after matching to send an opening message, and if neither does, the match expires. The chat then opens once the other person replies.

So a man on Bumble who sits still is not waiting for her to start. He is waiting for a rule Bumble does not use, while the match runs out.

Tinder, Hinge and OkCupid

On Tinder, you can only chat once you have matched. Nothing in its help center requires either person to go first.

On Hinge, every match begins with one person liking or commenting on a specific part of a card. After the match, either person can message.

On OkCupid, once two people like each other, they can message each other for free, and either one can start.

None of these asks her to write first, and none stops you from doing it.

Why waiting costs you

Most women do not write first, even when they are free to. a dating coach's view is that the apps reward the men who keep women engaged, and a man who writes a good first line is doing exactly that.

Think about what a match means. She tapped your card in a free second, and she may have forgotten it by the evening. If you wait, you are betting that a woman with a full inbox will remember you and take the initiative. Most will not.

A man on an app where either person can write has to open the conversation himself, or the match can go nowhere. That is true on all four.

What to send

One specific thing from her page, reacted to as you would in person. A place in her pictures, a dog, a line from her answers. End with a question she can answer in a line, and keep the whole message to two sentences.

On Hinge your like can carry the comment, so the first contact is already about something she wrote. On Bumble, your opening message is your one turn, so a bare hello wastes it. On Tinder and OkCupid, you simply write.

Skip her looks. She has read that line in every inbox she has ever opened.

When she does write first

Some women write first, and it is worth taking seriously, since she has done the unusual thing. Answer what she said. Add one thing you noticed about her. End with a question.

Do not answer in one word, and do not turn it into a plan she has not asked for. Match her effort, then suggest a day and a place within a few messages.

The practical rule

Treat the opening line as your job, on every app, within a day of matching. That removes the guesswork about which app has which rule.

Then spend your attention on what decides whether she replies: a clear lead photo in daylight and a line that is about her, not about the app.