Short answer: they are the same app. Same features, same document formats, same search, same favourites, same dark mode. If you put RFCReader Plus and RFCReader Pro side by side on two devices, you could not tell them apart from the inside — the only visible difference is the corner of the icon.

The real difference is how you pay. RFCReader Pro costs $1.99 up front and everything is unlocked the moment you install it. RFCReader Plus is free to download and unlocks the same full feature set through a single in-app purchase. There is no subscription in either one, and no feature is exclusive to either app.

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RFC Reader is out now. It is a reader for the entire IETF document series — every RFC from 0001 to the newest publication, in three formats, cached on your device so you can keep reading on a plane, in a basement meeting room, or anywhere else the network gives up.

Most of us meet an RFC as a browser tab: a 200-page text file, no table of contents, horizontal scrolling on a phone, and a search box that belongs to the browser rather than to the document. RFC Reader is built the other way round. Every screen exists for one thing — getting you through a long technical document without losing your place.

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