Independent CTV Ad Server Options Compared: FreeWheel, SpringServe, Publica, Google Ad Manager, Equativ and Self-Hosted Routes

A web ad server fills one slot on a page at a time. A CTV ad server fills a commercial break, a pod, which may hold four or five ads that must add up to an exact length. That one difference drives most of the features buyers and sellers compare.

• Pods, not slots. The server builds the break: how many ads, in what order, with no two ads from competing brands side by side. Magnite lists ad podding for commercial breaks among SpringServe's tools (Magnite 10-K, FY2025).
• Server-side delivery. TV apps usually receive ads already stitched into the stream. Google says stitching removes the ad request and response from the player SDK and so reduces client-side errors (Google Ad Manager Help).
• Video files that can be re-encoded. A stitcher must transcode each ad to match the stream. Google's DAI therefore accepts only VAST ads that can be transcoded and does not support VPAID (Google Ad Manager Help).
• Live breaks with fixed lengths. In live TV, an ad that runs a few seconds short leaves dead air. OpenRTB 2.6 added the rqddurs field for exactly this case (OpenRTB 2.6).
• TV-style controls. Broadcasters expect audio levels, creative review and household frequency caps. SpringServe's list includes audio normalisation, frequency capping and creative review (Magnite 10-K, FY2025).

A short scenario makes it concrete. A sports streamer sells a 120-second break in a live match. It has one sponsor guaranteed the first slot, a direct campaign for a 30-second spot, and room for programmatic demand in the rest. The ad server must honour the guarantee, keep a beer brand away from a rival beer brand, and fill the remaining seconds exactly. A web ad server was not built for that job.

The ad server and the stitcher are separate jobs, and they can come from different companies. Google notes that its DAI service can stitch ad breaks from Ad Manager and from third-party ad servers (Google Ad Manager Help). AWS describes MediaTailor as an ad insertion and channel assembly service for HLS and DASH streams, live and on demand (AWS MediaTailor documentation, accessed 9 November 2026).

1. The viewer presses play. The TV app asks the SSAI service for a stream.
2. The stream reaches a break. In live TV the break is marked with a cue, commonly in the SCTE 35 format (SCTE 35-1 2023r2).
3. The stitcher calls the ad server. It passes the break length, the device and any audience signals.
4. The ad server runs its decision. It weighs direct campaigns, programmatic guaranteed and private deals, and open bids from SSPs or a header bidding wrapper.
5. The ad server returns VAST. The response lists the ads in pod order.
6. The stitcher transcodes and inserts. It swaps the break's placeholder for the ads, so the viewer sees one stream.
7. Impressions are reported. Either the stitcher fires beacons from the server or the player fires them, and the ad server records delivery.

Our engineering guide to SSAI and CTV ad serving covers beacons, device headers and pod bidding in depth. This page focuses on choosing the decision layer.

The table sets the five commercial options beside the self-built route. Each cell reflects what the company publishes in filings, releases, help pages or product pages, checked on 9 November 2026. Where a company does not publish a detail, the cell says n/d. Detailed profiles of each vendor are linked in the last column.

Read the table as a map of who publishes what, not as a ranking. An n/d means the company does not describe that feature on the public pages we read, not that the feature is missing. Ask each vendor for documentation before you shortlist.

FreeWheel. FreeWheel describes itself as a Comcast company that runs as a standalone ad tech unit. It was founded in 2007 and bought StickyADS.tv in 2016 and Beeswax in 2021 (company history) (FreeWheel, accessed 9 November 2026). Its Publisher Suite pairs an ad server with FreeWheel SSP. Sellers can take the SSP alone or combine both as Streaming Hub. The FreeWheel profile covers its customers and products in detail.

SpringServe. Magnite bought SpringServe for about $31 million, net of an earlier $2 million stake. At the time it named Pluto TV, Sinclair, Univision and VIZIO among SpringServe's clients (Magnite, 1 July 2021). In April 2025 Magnite announced a new SpringServe platform that combines the ad server and its streaming SSP behind a single interface (Magnite 10-K, FY2025). Magnite says that in CTV, header-bidding-style competition has largely been built inside the ad server. See the SpringServe profile.

Publica. IAS paid $171.4 million in cash plus about 2.9 million shares for Publica in August 2021 (IAS 10-K, FY2021). Publica pitches its product as an ad server built for CTV broadcasters, with ad stitching, podding, a unified auction and an "inventory split" feature for shared breaks (company description) (Publica, accessed 9 November 2026). In July 2026 it connected to Viant's Direct Access supply path, naming Philo as a participating publisher (IAS, 8 July 2026). See the Publica profile and, for its parent, the Integral Ad Science profile.

Google Ad Manager 360 with DAI. Google's Dynamic Ad Insertion stitches ads into live linear and on-demand streams. Ads must be VAST, must be transcoded into HLS variants before or at first serve, and should sit in DAI-specific ad units (Google Ad Manager Help). Google also notes that on platforms using the DAI API rather than its IMA SDK, Open Measurement viewability tracking is not yet MRC accredited. See the Google Ad Manager profile, and for the wider choice, our guide to Google Ad Manager alternatives.

Equativ. Equativ began as Smart AdServer and lists the purchase of Serverside.AI in 2022 for CTV ad serving (Equativ, accessed 9 November 2026). Its CTV page offers a Dynamic Ad Insertion service that works with a publisher's existing ad server, plus its own ad server and SSP (Equativ, accessed 9 November 2026). At the Sharethrough merger, the combined group cited more than 720 employees in 18 countries (company figures) (Advanced Television, 13 June 2024). See the Equativ profile.

Measurement is the other point to check. IAS says advertisers buying Publica inventory can add IAS Total TV, which reports at show, genre and rating level, with publisher and app coverage in the US (IAS, 8 July 2026). Every option should state which verification vendors can measure inside the stitched stream. It should also say whether impression beacons fire from the server or from the device, because that choice changes what a verification tag can see.

One pattern runs through all five. Each ad server now sits next to a sell-side exchange owned by the same group: FreeWheel SSP, Magnite's SSP, Publica's header bidding, Google Ad Exchange and Equativ's SSP. That bundling can simplify integration. It also means a publisher should ask how demand from rival exchanges competes inside the ad server.

OpenRTB 2.6 gives sellers three ways to describe a break (OpenRTB implementation notes, 7.6):

• Structured pod. The seller fixes the number of slots, their order and each length in advance.
• Dynamic pod. The seller fixes the total length and the maximum number of ads, and lets bidders fill it.
• Hybrid pod. A mix: some fixed slots plus a dynamic remainder.

The notes ask sellers to offer dynamic pods where they can, so bidders can choose the best mix of ads. They also warn buyers that the seller builds the final pod and may take none, some or all of a buyer's bids. Here is an illustrative hybrid pod for a 120-second live break, with a guaranteed 30-second first slot and a 90-second dynamic remainder. Identifiers are placeholders; field names follow OpenRTB 2.6.

The floor maths in the table is simple multiplication: $0.50 × 30 seconds = $15.00 CPM. The notes tell buyers to use mincpmpersec when it is present and fall back to bidfloor otherwise (OpenRTB implementation notes, 7.6).

Header bidding works differently in CTV. Prebid Server's /openrtb2/video endpoint lets an SSAI server request bids for a pod, then returns key-values for a primary ad server such as FreeWheel or Google Ad Manager. A key-value of hb_pb_cat_dur = 1200_399_30s means a $12.00 price bucket, industry category 399 and a 30-second ad, which lets the ad server keep competing brands apart (Prebid, accessed 9 November 2026).

None of the five commercial ad servers publishes a price list on the pages we read. Magnite's annual report describes its general revenue model: usually a percentage of ad spend, sometimes a fixed CPM, and in some cases fixed monthly fees for the platform (Magnite 10-K, FY2025). Contract terms for CTV ad serving are negotiated.

Stitching is different, because cloud providers publish rates.

A worked example. A FAST channel owner stitches 2,000,000 live ad insertions a month on MediaTailor in US East. At $0.50 per 1,000, insertion costs $1,000 a month. If it also assembles the channel itself as a standard channel, 720 hours at $0.35 adds $252, before data transfer (AWS, accessed 9 November 2026). On Google's Video Stitcher API, the same 2,000,000 insertions at $0.50 CPM also cost $1,000 (Google Cloud). The ad server's fee and the SSP's take come on top, and those are the numbers to request in writing.

No mainstream open-source project offers a complete, production CTV ad server with pods, SSAI and programmatic demand in one package. A self-built route assembles parts instead.

The missing piece is usually the pod decision itself: combining direct campaigns, deals and bids into one ordered break with competitive separation. Teams that build it own the logic and the logs, and they also own the operations. Running Prebid Server is covered in our Prebid Server self-hosting guide, and the general-purpose option is profiled at Revive Adserver.

A test is a sensible first step. A publisher can stand up Channel Engine and the Eyevinn test ad server, point a managed stitcher at them, and check that beacons and durations behave before any real demand is connected.

1. Do you need stitching from the same vendor? Google and Equativ offer their own dynamic ad insertion; others may pair with a separate stitcher. Ask for the list of stitchers each ad server supports.
2. Do you sell live breaks? Ask how the server handles SCTE 35 cues, exact durations and last-minute schedule changes.
3. How are pods built? Ask for structured, dynamic and hybrid pod support, competitive separation rules and first-slot guarantees.
4. Which demand can compete? Ask whether rival SSPs and header bidding demand compete on equal terms with the owner's exchange.
5. Who owns the logs? Ask for impression-level log access, retention and export, and whether pricing changes with volume.
6. What does it cost in total? Request the ad serving fee, any SSP take rate and stitching costs separately, and compare them with the published stitching rates above.
7. How hard is it to leave? Ask how line items, creatives and deals can be exported. Our guide to switching ad servers without losing AdX demand covers migration on the web side.

The questions matter more for some sellers than others. A FAST channel owner on a revenue share may never run an ad server at all, because the platform sells the break, as our guide to FAST channels advertising explains. A broadcaster with live sport and its own sales team will use every item on the list. For the wider case for publisher-controlled stacks, see the publisher independence hub.

1. FreeWheel, "About" (accessed 9 November 2026). https://www.freewheel.com/about
2. FreeWheel, "Publisher Suite" (accessed 9 November 2026). https://www.freewheel.com/publishersuite
3. Magnite, Inc., Form 8-K exhibit 99.1, "Magnite Acquires SpringServe, A Leader in CTV Ad Serving Technology" (1 July 2021). https://www.sec.gov/Archives/edgar/data/1595974/000159597421000042/a991springservepressrelease.htm
4. Magnite, Inc., Form 10-K for fiscal year 2025 (25 February 2026). https://www.sec.gov/Archives/edgar/data/1595974/000159597426000007/mgni-20251231.htm
5. Magnite, Inc., Form 10-Q for the quarter ended 30 September 2026 (4 November 2026). https://www.sec.gov/Archives/edgar/data/1595974/000159597426000041/mgni-20260930.htm
6. Integral Ad Science Holding Corp., Form 10-K for fiscal year 2021 (3 March 2022). https://www.sec.gov/Archives/edgar/data/1842718/000162828022004899/ias-20211231.htm
7. Integral Ad Science Holding Corp., Form 8-K on completion of the merger with Novacap (23 December 2025). https://www.sec.gov/Archives/edgar/data/1842718/000114036125046475/ef20061707_8k.htm
8. Publica, home page (accessed 9 November 2026). https://getpublica.com/
9. Integral Ad Science, "Viant Integrates with Publica by IAS to Expand Premium Connected TV Access" (8 July 2026). https://integralads.com/news/viant-integrates-with-publica-by-ias-to-expand-premium-connected-tv-access/
10. Google Ad Manager Help, "Learn about Dynamic Ad Insertion (DAI)" (accessed 9 November 2026). https://support.google.com/admanager/answer/6147120?hl=en