Chartable vs OP3: closed product or open analytics

Chartable vs OP3 starts with one unavailable product and one current service. Chartable has shut down. OP3 remains active as a free, open-source prefix that publishes its calculation and makes participating-show data public. Choose OP3 when open, auditable download measurement fits your show, knowing that Chartable history cannot be exported or imported.

OP3 does not recreate all of Chartable's former work. It offers a transparent measurement layer, not a replacement for every SmartLink, attribution, or commercial reporting function Chartable once combined.

Chartable vs OP3 at a glance

The official Chartable domain redirects to Spotify's Megaphone site. You cannot create a current Chartable setup, so OP3 wins the availability question before features are compared.

The meaningful decision is whether OP3's public, open model matches the measurement job you need now.

What OP3 measures

The OP3 home page describes the Open Podcast Prefix Project as a free, open-source prefix analytics service committed to open data and listener privacy. A podcaster or host prepends the OP3 URL to supported episode media URLs. OP3 then receives the media requests, redirects them to the original file, and processes qualifying activity into download metrics.

Every participating show receives a public stats page. OP3 says that page includes industry-standard download metrics, detailed breakdowns, spreadsheet exports, and full OP3 history. No signup or login is required to begin.

That public model is the product, not an accidental setting. It can help a community show, researcher, sponsor, or developer inspect the same report without requesting account access. It can also conflict with a publisher's policy when show-level performance must remain private.

Read our OP3 review for the product-specific decision. It covers why public comparability is useful and where it stops.

OP3's calculation is open to inspection

OP3's download calculation explains how incoming requests become reported downloads. It says the service ignores non-GET requests, filters specified range requests, removes known or likely bot traffic, and ignores duplicate requests for the same normalized episode URL within the same UTC day when the secure IP hash, user agent, and referrer match.

Those details matter because a raw server request is not automatically a download. Filtering rules determine which events reach the report. OP3 links its explanation to relevant code paths, so a technical reader can inspect the implementation rather than relying only on a dashboard label.

The page also states that a download does not necessarily equal a listen because podcast apps can download episodes automatically. That is the same boundary described by the IAB Tech Lab: podcast delivery is measured from server logs, while listening attention is a different observation.

Our guide to what counts as a podcast download explains how to keep delivery, listening, and audience claims separate.

Public show data and listener privacy are different questions

OP3 opens participating-show statistics while protecting listener identifiers. Its privacy policy says listener IP addresses are securely hashed and encrypted before storage. It does not join those addresses with outside third-party services, and the API never returns raw IP addresses.

The policy also says the public Data API provides podcast and episode download data at a granular level. A monthly rotating secret key protects the listener IP hash returned through the API, and users cannot reverse a known address from an API response.

That creates a deliberate split:

• Listener network identifiers receive technical protection.
• Show and episode performance data becomes available to the public.

A publisher should evaluate both sides. Public numbers can make sponsor and community reporting easier. They can also expose release performance that a network usually treats as commercial information. OP3 is a poor fit if the team expects private analytics by default.

What OP3 does not replace from Chartable

Chartable combined several jobs in one brand, including prefix measurement and SmartLinks. OP3 focuses on open prefix analytics. It should not be described as a complete Chartable clone.

You may still need separate tools for:

1. Campaign landing pages and cross-platform listening links
2. Website conversion attribution
3. Private sponsor dashboards
4. Audience demographic or persona work
5. Platform-specific retention and engagement

A download counter can confirm qualified delivery under its method. It cannot show whether the listener reached the ad, remembered the offer, or purchased. Apple and Spotify can report behavior inside their own apps, while an advertiser's attribution setup can report later site activity. Keep each source in its own column.

The Chartable alternatives guide helps split these former jobs before you choose current tools. This avoids buying a large platform when a public counter is enough, or expecting OP3 to answer campaign questions it was not built to answer.

Setup is easy, but the reporting break is permanent

OP3 says you can add its prefix without removing an existing prefix and that more than one can be present. That does not mean every host or prefix chain should be changed without review. Confirm that your host supports the configuration and test playback after the change.

Chartable adds a stricter boundary. Its historical data cannot be exported, so nothing can be imported into OP3. Do not call this a migration or describe OP3 as continuing the Chartable trend line.

Use this fresh-start process:

1. Inspect the feed for an obsolete Chartable URL or redirect.
2. Ask the host how to remove or replace it safely.
3. Confirm the host permits the OP3 prefix.
4. Add OP3 through the supported host setting.
5. Play a recent episode in a normal app and verify the media loads.
6. Confirm the OP3 stats page begins reporting.
7. Record the activation date as day one of the OP3 series.

Our prefix installation guide explains the feed and playback checks behind a safe prefix change. The exact provider instructions differ, but the need to verify the media path does not.

Preserve any old Chartable screenshots, sponsor reports, or spreadsheets as dated historical records. Never merge those figures into OP3 totals as if both providers used one continuous method.

OP3's price and operating model

OP3 is free and supported by sponsors. Its website identifies the project as independent and open source. There is no account signup or paid plan to evaluate.

A publisher still pays for OP3 in operating time. Someone needs to own feed changes, interpret the public report, record methodology changes, and explain the data boundary to sponsors. OP3 also does not promise the account management or commercial support model of a paid analytics vendor.

For a technically capable independent show, that trade can be excellent. You receive a transparent counter and public export without a subscription. For a network that needs private views, service commitments, or several campaign functions in one contract, the operating burden may point elsewhere.

Who should choose OP3 now

Choose OP3 if you want free download measurement, public show statistics, an inspectable calculation, and open data that developers can use. It is especially suited to open-podcast projects and publishers comfortable making performance visible.

Choose another active tool if you need private reporting, managed support, audience demographics, campaign attribution, or SmartLinks. You can also use OP3 as one named measurement source while keeping platform engagement and advertiser outcomes in separate systems.

Do not choose Chartable because it is closed. Do not choose OP3 because its feature names seem close to an old workflow. Choose it because public, auditable download measurement serves a current decision.

Chartable is gone, and Podder is where its users landed when they wanted a current audience and campaign analytics path. If that broader job fits your show, start the Podder Analytics plan on a supported host. Installation starts a fresh series and does not recover Chartable history.