I've started development on the next major revolution of My Podcast Reviews (the leading service to see and share all your global podcast reviews), and in the process of collecting data, I've noticed some interesting correlations between the seriousness of podcasts and the hosting companies they are on. Here's that data.

(I'm writing this while my toddler is sleeping, so attractive charts and more detailed explanations will be missing for now.)

All of the following data is from Apple Podcasts and is updated as of December 1, 2018. I estimate only a 1% or smaller margin of error.

First, how many podcasts are in Apple Podcasts (AP)?

• About 609,000 podcasts listed
• A weekly fluctuation of +/- 5,000–7,000 based on new or removed podcasts (not conclusive on this number yet)

Podcast-hosting/publishing companies

For data on podcast-hosting companies, I looked at only the podcasts' RSS feed URLs. This is not 100% reliable and will, for most podcast-hosting companies, result in under-estimated numbers. This is because not every podcaster chooses to use the feed-publishing tools offered by their hosting company. For example, while Libsyn offers a powerful suite of offsite podcast publishing tools, many podcasters may use Libsyn only for hosting and stats, but generate their RSS feed elsewhere (such as with PowerPress on WordPress). This also doesn't account for feed-mirroring or feed-enhancement services, such as Podcast Mirror, FeedBurner, Podtrac, and such, because such services sometimes obscure the source feed URL. Thus, Blubrry will be noticeably absent from this list because Blubrry's own domains show up rarely in feed URLs, but usually only in the individual episode enclosures.

Now, on to the podcast hosting companies! (Due to the obscurity of some data, this is not a complete list of the top hosting companies, since Blubrry is obviously missing.)

• SoundCloud: 83.3K podcasts (13.7%)
• Anchor: 72.6K podcasts (11.9%)
• FeedBurner (not a podcast host): 49.8K podcasts (8.2%)
• Libsyn/Libsyn Pro: 41.0K podcasts (6.7%)
• podOmatic: 37.6K podcasts (6.2%)
• Podbean: 28.5K podcasts (4.7%)
• Spreaker: 15.2K podcasts (2.5%)
• Buzzsprout: 8.4K podcasts (1.4%)
• AudioBoom: 4.4K podcasts (0.7%)
• SimpleCast: 3.3K podcasts (0.5%)
• Omny Studio: 2.9K podcasts (0.5%)
• Acast: 2.4K podcasts (0.4%)
• Art19: 1.1K podcasts (0.016%)
• Fireside, Podtrac, FeedPress, and Megaphone are all under 1K
• Probably PowerPress (not a podcast host): 28.9K podcasts (4.7%)

Episode counts

Each podcaster can customize the number of episodes they keep available in their podcast's RSS feed. Publishing tools have different defaults, usually 10, 50, 100, or 300. Thus, episode counts are not a foolproof way to determine a show's commitment or longevity. But anything under 10 would be notable as it's below the default limit of probably all publishing tools.

1–10 episodes individually:

• 1 episode: 76.3K podcasts (12.5%)
• 2 episodes: 44.1K podcasts (7.2%)
• 3 episodes: 35.0K podcasts (5.7%)
• 4 episodes: 29.0K podcasts (4.8%)
• 5 episodes: 25.3K podcasts (4.1%)
• 6 episodes: 21.1K podcasts (3.5%)
• 7 episodes: 17.4K podcasts (2.9%)
• 8 episodes: 16.4K podcasts (2.7%)
• 9 episodes: 14.9K podcasts (2.4%)
• 10 episodes: 29.7K podcasts (4.9%)

Note the decline in counts up to 9. But because 10 is a popular limit, there are many more podcasts with that many episodes in their feed. (Remember, there may be more episodes beyond that limit. This is a measurement of only what's in the feeds.)

Now, some groupings:

• 1–9 episodes: 279.4K (45.9%)
• 10–50 episodes: 218.1K podcasts (35.8%)
• 51–100 episodes: 58.9K podcasts (9.7%)
• 101–200 episodes: 25.8K podcasts (4.2%)
• 201–300 episodes: 22.5K podcasts (3.7%)
• 301 or more episodes: 42 podcasts (.0068%)

There are about 4.3 million episodes published in Apple Podcasts. Thus, the average number of episodes per feed is about 7. But again, this is highly affected by self-imposed episode limits in feeds and thus not reflective of the true number of podcast episodes. For example, many highly popular and long-running podcasts like This Week in Tech, TouchArcade, and No Agenda limit their feed to display only the latest 10 episodes (16 currently in No Agenda‘s feed).

“New,” “active,” and “inactive”

As a kid in the '80s and '90s, I remember going to the video rental stores (imagine if Netflix/Hulu/etc were physical stores you had to drive to and pay for each movie you spent hours deciding to watch). There would always be a “new releases” section, and it amazed me how long movies would stay in there. So I've always wondered how long something is truly “new.”

For this post, I'll define such labels as follows:

• New: launched within the past 3 months (not enough data, yet)
• Active: published an episode within the past 3 months (229.8K podcasts)
• Inactive: no published episodes within the past 3 months (372K podcasts, and yes, this may be skewed against some seasonal shows)

As I'm publishing this on December 3, 2018, I used September 1, 2018 as the split date. Any shows with episodes on or after that date I label “active,” and any shows without episodes on or after that date are labeled “inactive.”

Segmenting by podcast hosting/publishing tool

Now this is where it gets really interesting! Let's look at the same kinds of numbers as above, but broken down by podcast hosting or publishing tool.

Percentages in the following will be of the number of podcasts generated by each host/tool.

SoundCloud

• 83.3K podcasts
• 33.7K active podcasts (40.5%)
• 49.6K inactive podcasts (59.5%)
• 27.0K with 3 or fewer episodes (32.4%)
• 21.6K with 4–9 episodes (25.9%)
• 23.7K with 10–50 episodes (28.5%)
• 11.1K with 51 or more episodes (13.3%)
• 48.8K point to podcast page on media host (58.6%)

Anchor

• 72.2K podcasts
• 30.1K active podcasts (41.7%)
• 42.1K inactive podcasts (58.3%)
• 41.6K with 3 or fewer episodes (57.7%)
• 15.3K with 4–9 episodes (21.2%)
• 13.0K with 10–50 episodes (18.0%)
• 2.2K with 51 or more episodes (3.0%)
• 72.1K point to podcast page on media host (99.9%)

FeedBurner

• 49.7K podcasts
• 12.9K active podcasts (26.0%)
• 36.8K inactive podcasts (74.0%)
• 8.4K with 3 or fewer episodes (16.9%)
• 9.8K with 4–9 episodes (19.6%)
• 22.8K with 10–50 episodes (45.9%)
• 8.8K with 51 or more episodes (17.6%)
• 126 point to podcast page on media host (0.3%)

Libsyn/Libsyn Pro

• 40.9K podcasts
• 25.3K active podcasts (62.0%)
• 15.5K inactive podcasts (38.0%)
• 3.3K with 3 or fewer episodes (8.1%)
• 6.5K with 4–9 episodes (15.9%)
• 18.2K with 10–50 episodes (44.5%)
• 12.9K with 51 or more episodes (31.6%)
• 18.3K point to podcast page on media host (44.9%)

Podbean

• 28.3K podcasts
• 15.7K active podcasts (55.3%)
• 12.7K inactive podcasts (44.7%)
• 7.0K with 3 or fewer episodes (24.7%)
• 5.3K with 4–9 episodes (18.6%)
• 11.4K with 10–50 episodes (40.2%)
• 4.7K with 51 or more episodes (16.6%)
• 26.6K point to podcast page on media host (94.0%)

Spreaker

• 15.1K podcasts
• 7.9K active podcasts (52.5%)
• 7.2K inactive podcasts (47.5%)
• 3.1K with 3 or fewer episodes (20.7%)
• 3.6K with 4–9 episodes (24.0%)
• 5.2K with 10–50 episodes (34.4%)
• 3.2K with 51 or more episodes (21.0%)
• 13.6K point to podcast page on media host (89.8%)

Buzzsprout

• 8.3K podcasts
• 6.4K active podcasts (76.8%)
• 1.9K inactive podcasts (23.2%)
• 1.9K with 3 or fewer episodes (22.7%)
• 1.9K with 4–9 episodes (23.3%)
• 2.9K with 10–50 episodes (35.3%)
• 1.6K with 51 or more episodes (18.8%)
• 565 point to podcast page on media host (6.8%)

SimpleCast

• 3.3K podcasts
• 2.4K active podcasts (72.7%)
• 894 inactive podcasts (27.3%)
• 411 with 3 or fewer episodes (12.6%)
• 693 with 4–9 episodes (21.2%)
• 1.5K with 10–50 episodes (44.8%)
• 700 with 51 or more episodes (21.4%)
• 232 point to podcast page on media host (7.1%)

Acast

• 2.4K podcasts
• 1.3K active podcasts (52.9%)
• 1.1K inactive podcasts (47.1%)
• 186 with 3 or fewer episodes (7.8%)
• 444 with 4–9 episodes (18.7%)
• 1.0K with 10–50 episodes (43.4%)
• 713 with 51 or more episodes (30.1%)
• 1.1K point to podcast page on media host (48.2%)

Art19

• 1.1K podcasts
• 844 active podcasts (80.2%)
• 209 inactive podcasts (19.8%)
• 35 with 3 or fewer episodes (3.3%)
• 114 with 4–9 episodes (10.8%)
• 416 with 10–50 episodes (39.5%)
• 488 with 51 or more episodes (46.3%)
• 831 point to podcast page on media host (78.9%)

Megaphone

• 935 podcasts
• 736 active podcasts (78.7%)
• 199 inactive podcasts (21.3%)
• 41 with 3 or fewer episodes (4.4%)
• 110 with 4–9 episodes (11.8%)
• 315 with 10–50 episodes (33.7%)
• 469 with 51 or more episodes (50.2%)
• 10 point to podcast page on media host (1.1%)

Fireside

• 618 podcasts
• 465 active podcasts (75.2%)
• 153 inactive podcasts (24.8%)
• 63 with 3 or fewer episodes (10.2%)
• 119 with 4–9 episodes (19.3%)
• 265 with 10–50 episodes (42.9%)
• 171 with 51 or more episodes (27.7%)
• 513 point to podcast page on media host (83.0%)

Probably PowerPress

• 28.9K podcasts
• 14.4K active podcasts (49.8%)
• 14.5K inactive podcasts (50.2%)
• 3.4K with 3 or fewer episodes (11.8%)
• 5.4K with 4–9 episodes (18.8%)
• 15.2K with 10–50 episodes (52.7%)
• 4.8K with 51 or more episodes (16.7%)
• 0 point to podcast page on media host (0.0%)

FeedPress

• 850 podcasts
• 482 active podcasts (56.7%)
• 368 inactive podcasts (43.3%)
• 73 with 3 or fewer episodes (8.6%)
• 231 with 4–9 episodes (27.2%)
• 331 with 10–50 episodes (38.9%)
• 215 with 51 or more episodes (25.3%)
• 8 point to podcast page on media host (0.9%)

Podtrac

• 954 podcasts
• 331 active podcasts (34.7%)
• 623 inactive podcasts (65.3%)
• 97 with 3 or fewer episodes (10.2%)
• 156 with 4–9 episodes (16.4%)
• 345 with 10–50 episodes (36.2%)
• 356 with 51 or more episodes (37.3%)
• 2 point to podcast page on media host (0.2%)

Omny Studio

• 2.9K podcasts
• 2.1K active podcasts (72.7%)
• 790 inactive podcasts (27.3%)
• 155 with 3 or fewer episodes (5.4%)
• 324 with 4–9 episodes (11.2%)
• 924 with 10–50 episodes (32.0%)
• 1.5K with 51 or more episodes (51.5%)
• 53 point to podcast page on media host (1.8%)

AudioBoom

• 4.4K podcasts
• 2.0K active podcasts (45.9%)
• 2.4K inactive podcasts (54.1%)
• 552 with 3 or fewer episodes (12.5%)
• 790 with 4–9 episodes (17.8%)
• 1.8K with 10–50 episodes (39.6%)
• 1.3K with 51 or more episodes (30.2%)
• 4.0K point to podcast page on media host (91.0%)

podOmatic

• 37.6K podcasts
• 3.8K active podcasts (10.2%)
• 33.7K inactive podcasts (89.8%)
• 15.4K with 3 or fewer episodes (40.9%)
• 11.5K with 4–9 episodes (30.7%)
• 8.9K with 10–50 episodes (23.8%)
• 1.7K with 51 or more episodes (4.6%)
• 37.5K point to podcast page on media host (100.0%)

Interpretations

Data is subject to interpretation, so here's how I interpret this information I've shared.

1. Free podcast-hosting companies may boast high numbers of podcasts, but they usually have very low active podcasts. This is probably because “free” asks for very little strategy or commitment.
2. Premium podcasting tools seem to show more committed, active users.
3. FeedBurner has more inactive users than active, probably because a lot of podcasters who ended their shows have not bothered to migrate to better publishing tools.
4. Anchor and SoundCloud are the most popular media hosts, but they also have the highest percentages of inactive podcasts. And a shockingly high number of Anchor users have 3 or fewer episodes, indicating very new shows or very uncommitted podcasters.
5. A disappointing majority of podcasts on a majority of hosting providers have the feed pointing back to the podcast webpage on the host. This could be laziness on the podcaster's part to not change it to their own domain, it could be ignorance of the ability (and necessity) to change such setting, it could be that the tool doesn't even allow that setting to be changed, or it could be that the podcaster is intentionally using the media host's website as their podcast's primary website. (But you should still get your own domain and update the website URL in your feed!) The most shocking of these is Anchor-hosted shows where all but 3 were pointing at the podcast's page on Anchor. The only 3 that weren't doing so appear to be migrations from other hosting services and are thus still pointing back to those previous services.
6. As could be expected, this data suggests that the kinds of people willing to invest in their podcasting tools are the kinds of people likely to keep the podcast active.
7. Inversely, it also appears that providers with extremely low-barrier tools and no costs to the podcaster result in a lot of “flash in the pan” podcasts that publish only a couple episodes and then podfade. Anchor's high number in Apple Podcasts is also likely due to their automated submission of their users' podcasts to Apple, but through Anchor's own account (and not the podcasters').

I have no doubt this data will be interpreted in other ways, and some companies might be unhappy with what the data reveals.

What's your interpretation?

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