# Feature comparison (/docs/feature-comparison)



## Choose an input workflow [#choose-an-input-workflow]

| Feature                       | Browser extension                     | RSS or Atom feed                                       | Newsletter inbox                                                            |
| ----------------------------- | ------------------------------------- | ------------------------------------------------------ | --------------------------------------------------------------------------- |
| Best for                      | One page you are reading now          | A publication with a public feed                       | Email newsletters                                                           |
| Added by                      | Clicking the extension                | Adding a public feed URL                               | Subscribing with a private Relay address                                    |
| Trigger                       | You choose **Add** or **Send EPUB**   | A reading-list schedule or **Run now**                 | A reading-list schedule or **Run now**                                      |
| Content used                  | The current public article            | New feed entries; linked articles may enrich summaries | Sanitized newsletter HTML                                                   |
| First scheduled edition       | The captured page is already selected | Latest existing feed entry                             | Latest existing observed message                                            |
| Later editions                | Captures added since the last edition | Entries newer than that list's cursor                  | Messages newer than that list's cursor                                      |
| Private or login-only content | Not supported                         | Not supported                                          | Supported only when the newsletter is actually received by your Relay inbox |
| X support                     | Public X Articles only                | Not applicable unless supplied by a valid feed         | Newsletter content only                                                     |

Each reading list maintains its own cursor. The same feed or newsletter can therefore appear in two
independently scheduled lists without one list consuming the other's entries.

## Choose an output [#choose-an-output]

| Action                              | Result                                     | Delivery timing                     | Stored in the library          |
| ----------------------------------- | ------------------------------------------ | ----------------------------------- | ------------------------------ |
| **Add to reading list**             | The page joins the selected list           | At the next scheduled or manual run | When that edition is generated |
| **Send EPUB**                       | A one-article EPUB                         | Automatically after it is ready     | Yes                            |
| **Run now**                         | A normal edition using current new entries | Immediately queued                  | Yes                            |
| **Download EPUB**                   | The existing EPUB file                     | Immediate browser download          | Already stored                 |
| **Send to device** from the library | An existing EPUB is resent                 | Immediately queued for that device  | Already stored                 |

## Device comparison [#device-comparison]

| Destination          | Automatic email delivery                                        | Web reader | Direct download |
| -------------------- | --------------------------------------------------------------- | ---------- | --------------- |
| Kindle               | Yes, after approving `relay@ereaderrelay.com` with Amazon       | Yes        | Yes             |
| Kobo                 | Yes when your Kobo workflow provides an email ingestion address | Yes        | Yes             |
| Other eReader        | Yes when it accepts EPUB personal documents by email            | Yes        | Yes             |
| No registered device | No; books remain library-only                                   | Yes        | Yes             |

Device providers control their own conversion, limits, and delivery times. Register the exact
send-to-device address supplied by the provider.

## Plan comparison [#plan-comparison]

The product currently exposes Free, Basic, and Pro billing tiers. A public feature-and-limit matrix
is not listed yet because concrete creation limits and tier-specific switches are not enforced in
the current release. Until that policy is published, the authenticated **Billing** page is the
source of truth for configured prices and subscription status—not for promised feature limits.