ID5 vs Unified ID 2.0
ID5
Free, privacy-compliant universal ID
Publishers using it: 21 · incl. AccuWeather, ANSA, Der Spiegel
Unified ID 2.0
The Trade Desk's open email-based identifier
Publishers using it: 10 · incl. AccuWeather, Dish Media, fuboTV
Publishers running both: 1
Last verified Nov 11, 2026
At a glance
- ID5 scores 3.8/5 and Unified ID 2.0 scores 3.4/5 in Benchmark Grid's independent identity resolution & first-party ID solutions benchmark, both assessed on the same 10 criteria.
- The widest gaps are prebid/ssp integration & signal distribution (ID5 4.5, Unified ID 2.0 4.0) and implementation & technical debt (ID5 3.2, Unified ID 2.0 2.8); they are within 0.3 on 7 of 10 criteria.
- Both are built for mid-market and enterprise publishers.
- On total cost of ownership ID5 scores 3.9 and Unified ID 2.0 2.8 (higher means better value, not a lower price).
- In our tracking 21 publishers use ID5 and 10 use Unified ID 2.0; 1 runs both.
- Scores last verified 11 Nov 2026. Vendors cannot pay for a score or a position.
Where they differ
ID5 is stronger on prebid/SSP Integration & Signal Distribution (4.5 vs 4.0), implementation & Technical Debt (3.2 vs 2.8) and privacy & Consent-Native Design (4.1 vs 3.8).
Unified ID 2.0 is stronger on support & Documentation (3.2 vs 2.9).
Which one fits
Choose ID5 if…
- You publish at mid-market and enterprise scale.
- You weight prebid/SSP Integration & Signal Distribution, implementation & Technical Debt and privacy & Consent-Native Design heavily — ID5 leads on those in this benchmark.
Choose Unified ID 2.0 if…
- You publish at mid-market and enterprise scale.
- You weight support & Documentation, cookieless Determinism & Stability and ad Rate Lift & Monetization Impact heavily — Unified ID 2.0 leads on those in this benchmark.
Also weighing these
The nearest-scored tools to ID5 and Unified ID 2.0 in this benchmark, listed A to Z.
- 3.4AudigentFirst-party data and identity activationRead review
- 3.8LiveRamp RampIDIndustry-standard authenticated identity graphRead review
- 3.4OptableCustomer-owned identity graph with no proprietary IDRead review
- 3.2The Trade DeskIndependent DSP powering UID2.0 and cross-channel identity graphRead review
All 6 scored tools are in Best Identity Resolution & First-Party ID Solutions for Publishers.
Who uses them
Publishers we have detected running each tool, from ads.txt, site code and published case studies. Agencies, brands and vendors are excluded.
Running both (1): AccuWeather
Head to head
| Criterion | ID5 | Unified ID 2.0 |
|---|---|---|
| Match Rate & Cross-Domain Reach16% of capability | 4.2 | 4.2 |
| Privacy & Consent-Native Design14% of capability | 4.1 | 3.8 |
| Cookieless Determinism & Stability12% of capability | 3.8 | 3.9 |
| Prebid/SSP Integration & Signal Distribution12% of capability | 4.5 | 4.0 |
| Ad Rate Lift & Monetization Impact10% of capability | 3.4 | 3.5 |
| Publisher Data Enrichment & Segmentation10% of capability | 2.2 | 2.2 |
| Implementation & Technical Debt8% of capability | 3.2 | 2.8 |
| Transparency & Reporting8% of capability | 2.8 | 2.5 |
| Pricing Model (CPM / Take Rate)6% of capability | 4.5 | 4.5 |
| Support & Documentation4% of capability | 2.9 | 3.2 |
| Capability45% of composite | 3.7 | 3.5 |
| Publisher fit40% of composite | 4.0 | 3.5 |
| Total cost of ownership15% of composite | 3.9 | 2.8 |
Cost of ownership
| Sub-score | ID5 | Unified ID 2.0 |
|---|---|---|
| Pricing transparency | 4.5 | 3.0 |
| Entry cost | 4.5 | 4.5 |
| Implementation cost | 3.5 | 1.5 |
| Hidden-fee risk | 3.5 | 3.0 |
| Ongoing cost | 3.5 | 2.0 |
ID5 pricing
Free for publishers; registration with ID5 is required to obtain a Partner Number.
Unified ID 2.0 pricing
No fee is listed for publishers; integration requires signing the UID2 participation contract.
What users say
ID5
8 positive · 4 neutral · 0 negative
Unified ID 2.0
11 positive · 9 neutral · 0 negative
Mentions we could not tie to a real user, and those flagged as promotional, are excluded. Sentiment is opinion, and is independent of the verified publisher adoptions above.
ID5 scores 3.8 and Unified ID 2.0 scores 3.4 in Benchmark Grid's independent Best Identity Resolution & First-Party ID Solutions for Publishers benchmark (benchmarkgrid.com/vs/id5/unified-id-2-0, verified Nov 11, 2026)
Common questions
How do ID5 and Unified ID 2.0 differ?
ID5 is stronger on prebid/SSP Integration & Signal Distribution (4.5 vs 4.0), implementation & Technical Debt (3.2 vs 2.8) and privacy & Consent-Native Design (4.1 vs 3.8). Unified ID 2.0 is stronger on support & Documentation (3.2 vs 2.9). Neither is better in the abstract — which one suits you depends on which of those dimensions carries the most weight in your operation.
Which is cheaper, ID5 or Unified ID 2.0?
On total cost of ownership — pricing transparency, entry cost, implementation, hidden-fee risk and ongoing cost — ID5 scores 3.9/5 and Unified ID 2.0 scores 2.8/5. A higher score means better value, not a lower sticker price.
How are these scores calculated?
Each tool is assessed against its category's published criteria (10 in this benchmark), which make up Capability (45% of the composite), Publisher fit (40%) and Total cost of ownership (15%). Assessment is carried out by SODP's editorial team against a published methodology. Vendors cannot pay for inclusion, scores or positions.
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Both tools are scored in Best Identity Resolution & First-Party ID Solutions for Publishers. See alternatives to ID5 or alternatives to Unified ID 2.0.
Weighing a third option? Add a tool to this comparison.
Where to next
Four questions, and a scored stack across every benchmark — not just Best Identity Resolution & First-Party ID Solutions for Publishers
Every scored tool in Best Identity Resolution & First-Party ID Solutions for Publishers, with the criteria behind each number
Every category, independently scored
Related comparisons
Other head-to-heads publishers look at in Best Identity Resolution & First-Party ID Solutions for Publishers.
