Is an open relationship the same as polyamory?
No. An open relationship is defined by the mutual agreement that each partner may connect with other people — often sexually, sometimes romantically — while polyamory centres multiple loving relationships at the same time, with everyone’s knowledge. Polyamory is one way to be open; plenty of open relationships keep outside connections sexual rather than romantic, and a person can be both.
Both labels sit inside ethical non-monogamy, and both run on the same foundations: honesty, consent and agreements that everyone knows about. What separates them is what the outside connections are allowed to become. An open relationship describes the permission structure — each partner may connect with others. Polyamory goes further and describes the content: multiple loving, romantic relationships at once, which means the outside connections are relationships in their own right rather than recreation.
That difference is clearest in the arrangements people write. The agreements vary: outside connections may be sexual only, may be expected to stay casual, or may be a topic to raise if feelings appear. Whether a rule banning feelings can hold is a fair question, and it is the one that trips people up: attraction and affection are not fully under anyone’s control, so an agreement is usually more honest when it says what happens if feelings show up — tell each other, slow down, revisit — than when it forbids them. Polyamory is what it looks like when the feelings are allowed to be the point.
The grey areas are where the labels blur, and they are worth knowing because people use them loosely. “Monogamish” describes a relationship that is mostly closed with agreed exceptions — still open in structure, even if the exceptions are rare. Don’t-ask-don’t-tell describes an open arrangement with limits on what is shared, which is a disclosure question rather than a romantic one. An open marriage is the same idea inside a marriage. None of those automatically involves polyamory, and none is automatically excluded from it.
If you are working out which word fits, the exercise that helps is naming the agreements rather than choosing the label. What is each of you allowed to do, and with whom? Are outside connections allowed to become romantic? What do you tell each other, and when? What are the safer-sex terms? The answers to those four questions describe the actual relationship far better than the label does, and they are the same questions the answer on setting rules as a couple sets out for any arrangement.
One practical note: the words carry expectations for the people you meet, so it is kind to be specific about your own arrangement rather than assuming a shared definition. Someone hearing “open relationship” may assume sex only; someone hearing “polyamorous” may assume a network of partners. The answer on what an open relationship is covers the term itself, and the ENM answer covers the umbrella the two share. JoinTheSwing is pre-launch: new registration remains closed until the coordinated native-app release is approved, and the public answers library and free launch list are open meanwhile.