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Comparison

RSS vs Atom

Atom is the better-specified format and RSS is the one everything reads. The real difference is strictness: Atom requires what RSS merely permits.

RSS 2.0 requires three elements on the channel and almost nothing on an item — an item needs a title or a description, and that is the whole requirement. Atom requires an id, a title and an updated timestamp on the feed and on every entry, plus an author at one level or the other.

That strictness is why Atom feeds are easier to consume and why fewer people publish them. A reader handed an RSS item with no identifier and no date cannot tell new from seen, and cannot order the feed; the same reader handed an Atom entry always can.

In practice the question is rarely either/or: publish RSS because everything reads it, and take Atom's discipline with you — a stable identifier on every item, a real date in the right format, and a link that says where the feed itself lives.

What actually differs

RSS 2.0 compared with Atom 1.0, one row per aspect
AspectRSS 2.0Atom 1.0
SpecificationRSS 2.0, a short informal specRFC 4287, an IETF standard
NamespaceNone — core elements are unqualifiedhttp://www.w3.org/2005/Atom on everything
Required on the feedtitle, link, descriptionid, title, updated — plus an author somewhere
Required on an itemA title or a description. Nothing elseid, title, updated — all three
DatesRFC 822: Mon, 10 Aug 2026 09:00:00 GMTRFC 3339: 2026-08-10T09:00:00Z
Identity<guid>, optional<id>, required and permanent
Content<description>, plus content:encoded by extension<content>, with a type attribute in the core
Self linkBorrowed from Atom by convention<link rel="self">, part of the format

Shown, not asserted

The differences above are claims, so here they are being made. Every one of these runs on each test run, against the same engines the tools use — the outputs are what came back, not what we expected.

  • An Atom feed missing an id is invalid, and the checker names the requirement rather than shrugging.

    document.xml
    <?xml version="1.0" encoding="UTF-8"?>
<feed xmlns="http://www.w3.org/2005/Atom">
  <title>Example</title>
</feed>

    What came back

    <feed> is missing the required <id>. RFC 4287 requires all three.

  • The same feed in RSS: an item with nothing but a title is conformant, and the only complaint is about the identifier readers will miss.

    document.xml
    <?xml version="1.0" encoding="UTF-8"?>
<rss version="2.0">
  <channel>
    <title>Example</title>
    <link>https://example.com/</link>
    <description>Notes.</description>
    <item><title>Hen lays egg</title></item>
  </channel>
</rss>

    What came back

    1 item has neither <guid> nor <link>, so readers cannot tell new items from seen ones.

Which to pick

RSS 2.0, when

  • Reach is the point. Every reader, podcast client and aggregator handles RSS, and some still handle it better.
  • You are publishing a podcast — the iTunes vocabulary is defined as an RSS extension.
  • An existing consumer expects it, which is most of the time.

Atom 1.0, when

  • Consumers need to deduplicate reliably: a required, permanent id is worth more than any other difference.
  • Dates matter and you want them unambiguous — RFC 3339 has one form, RFC 822 has several and half of them are wrong.
  • The feed is machine-to-machine and you would rather the format enforced the fields than trust every publisher.

Where it reaches

Related comparisons

All 7 comparisons

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