How we make this list: we compare pricing pages, product documentation and public user reviews. Rankite is independent; if a vendor ever pays for a featured spot, that listing is clearly labeled Partner.
Key takeaways
- LiveRamp remains the standard for cookieless ad identity, with RampID anchoring most serious media buys.
- FullContact is the most accessible identity graph, with a real-time API and a no-match-no-charge model.
- Amperity is the pick for large consumer brands that need AI-powered resolution inside a full CDP.
- Almost every enterprise vendor in this category is quote-based, so budget six figures and a sales cycle before you commit.
Quick comparison
| Tool | Best for | Starting price | Free plan |
|---|
 LiveRamp | Cookieless ad identity at scale | See website | No |
 FullContact | Real-time identity graph API | See website | Free trial |
 Amperity | Enterprise CDP with AI resolution | See website | No |
 Throtle | Agencies onboarding offline data | See website | No |
 AtData | Email validation plus identity data | See website | Free trial (100 queries) |
 Twilio Segment | First-party data with Unify resolution | See website | Free trial |
 Zeotap | European CDP with identity resolution | See website | No |
 Infutor | Consumer identity data and onboarding | See website | No |
 Treasure Data | Enterprise CDP with flexible identity | See website | Free trial |
 Neustar (TransUnion) | Identity resolution for regulated industries | See website | No |
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We review this list regularly. Vendors can request a listing, send updated pricing or ask about featured placement.
The best identity resolution software
Identity resolution is one of the few categories where the software and the data are inseparable. You are not buying an app so much as renting access to an identity graph, a giant database of people, devices and addresses that the vendor spent years building. That is why the prices are high, the sales cycles are long, and almost nobody publishes a price.
The honest take: if you are a mid-size company, you probably do not need a pure-play identity resolution vendor. A CDP with identity resolution built in, like Twilio Segment or Treasure Data, or an API vendor like FullContact, covers most use cases. The dedicated graph vendors earn their fees at real scale, in media buying, fraud prevention and multi-brand customer stitching.
Buying note on pricing in this category
Every enterprise vendor on this list prices on a custom quote, and we checked each vendor's own pricing page in October 2026. Where no number is published, the article says "See website" rather than inventing one. Expect six-figure annual contracts for the graph vendors, MTU-based pricing for the CDPs, and per-match or per-query metering for the API vendors. Ask for the unit of measurement in writing before you compare quotes: a "match," a "session" and a "monthly tracked user" are three different things.
Starting priceSee website
Free planNo
LiveRamp built the infrastructure that the post-cookie advertising world runs on. RampID is a persistent, privacy-safe identifier that lets publishers, brands and platforms recognize the same customer across devices and environments without third-party cookies. The data collaboration tools let companies share and measure audiences without exposing raw customer data.
This is enterprise software in every sense. Pricing is custom, implementation takes a real project plan, and the platform makes the most sense when media spend is large enough that match rates directly move revenue. Smaller brands get similar outcomes through their CDP or ad platform without a direct LiveRamp contract.
What we like- RampID is the most widely adopted persistent identifier
- Strong data collaboration network
- Privacy-first design
Watch out for- Enterprise-only pricing and sales cycle
- Overkill for smaller teams
- Onboarding complexity is real
Starting priceSee website
Free planFree trial
FullContact is the most approachable way to get identity resolution into your stack. The Person API takes an email, phone number or other fragment and returns a unified identity with social profiles, demographics and hundreds of marketing attributes. The pricing model is fair: if the API returns no data, you do not pay for the call.
Identities can be queried in real time or in batch, and resolved records roll up into a persistent PersonID. The vendor does not pool your data with other clients' data and carries SOC 2 Type II certification. The catch is that published pricing is thin: the vendor's pricing page routes to a sales conversation, so budget for a quote and ask about volume tiers early.
What we like- No charge when there is no match
- Patented identity graph with billions of records
- Appends hundreds of attributes
Watch out for- Pricing page is a sales form
- Match rates vary by data type
- Enterprise features need a contract
Starting priceSee website
Free planNo
Amperity is a customer data platform whose headline feature is identity resolution that works on messy data. Its AI-driven matching connects records even when they are incomplete, inconsistent or lack linking keys, which is the real-world state of most customer databases. Large consumer brands use it as core customer infrastructure, processing massive record volumes daily.
Pricing is usage-based in Amps, a standardized unit covering record processing, segmentation and activation, and the vendor publishes no dollar rates. Third-party data suggests annual contracts typically start in the low six figures and can exceed half a million. Two editions, Standard and Enterprise, differ mainly in support coverage.
What we like- AI-driven matching handles incomplete and inconsistent data
- Scales to trillions of records
- Strong retail and travel base
Watch out for- Publishes no prices
- Six-figure contracts are the norm
- Needs in-house data staff to run well
Starting priceSee website
Free planNo
Throtle sells identity resolution as a service layer for agencies, brands and platforms that need to connect offline customer records to digital identifiers. Its identity graph links individuals across devices and channels, and the company built its reputation on onboarding, the unglamorous work of matching a CRM file to cookies, mobile IDs and emails.
The company is reseller friendly, which makes it a practical pick for agencies that want to offer identity services to clients without building their own graph. Pricing is entirely quote-based and depends on volume and use case. Data coverage is strongest in the United States, so international buyers should verify match rates for their markets.
What we like- Strong offline-to-online onboarding
- Agency and reseller friendly
- Individual-level identity graph
Watch out for- Quote-only pricing
- Smaller public review footprint than rivals
- US-centric data coverage
Starting priceSee website
Free planFree trial (100 queries)
AtData, formerly TowerData, sits at the intersection of email validation and identity resolution. The platform validates email addresses, detects spam traps and disposable domains, and layers on identity data like age and gender for personalization. A free trial of 100 queries lets you test before paying.
Pricing is usage-based by the query or match, with a monthly minimum on API plans, and the vendor does not publish a simple rate card, so the table says "See website." Independent audits have found its email validation accuracy below the best pure-play verifiers, so buyers who need top-tier validation should benchmark it against specialists. For marketers who want validation and identity data from one vendor, the combination is convenient.
What we like- Combines email validation with identity data
- Free trial of 100 queries
- Pay-as-you-go API available
Watch out for- Email validation accuracy lags top specialists
- Support responsiveness gets mixed reviews
- Pricing tiers can confuse
Starting priceSee website
Free planFree trial
Twilio Segment approaches identity from the first-party side. Instead of renting a third-party graph, Unify resolves identities from the behavioral data you already collect, stitching events and warehouse records into governed, identity-resolved profiles. That makes it the right choice for companies investing in first-party data strategy.
The product is split into a Customer Data Pipeline (collect and route) and a Customer Data Platform (adds identity resolution, audiences and journeys). Both price on monthly tracked users rather than seats, but the CDP plan with identity resolution is custom volume pricing by quote. A free trial exists for the Pipeline tier. Engineering work is needed to instrument tracking properly.
What we like- Unify builds identity-resolved profiles from first-party data
- 700+ destinations
- Pricing scales on MTUs not seats
Watch out for- Full CDP plan is quote-only
- Identity resolution is in the Platform plan, not the Pipeline
- Needs engineering to instrument
Starting priceSee website
Free planNo
Zeotap is the European answer to the identity question. Its customer intelligence platform combines a CDP with identity resolution and consent management, built from the start for GDPR-regulated markets. Telecom data partnerships give it distinctive deterministic data in several European countries.
For brands operating primarily in Europe, Zeotap's consent-first architecture is a genuine advantage over US vendors that bolted compliance on later. The US footprint is smaller, and pricing is entirely custom. Buyers should treat it as an enterprise evaluation with a real RFP, not a self-serve purchase.
What we like- Strong European data and consent posture
- Telecom-grade data partnerships
- Built for GDPR markets
Watch out for- Quote-only pricing
- Smaller US footprint
- Enterprise sales cycle
Starting priceSee website
Free planNo
Infutor is a consumer identity data company: large-scale data on individuals and households used for identity verification, onboarding, data hygiene and marketing. Its datasets feed identity resolution for companies that need to verify who a customer is or append missing contact data at scale.
Like most data vendors, Infutor sells through custom quotes, and the data licensing terms deserve a careful read by your legal team, particularly around permitted uses and retention. The company is now part of Verisk, which changed the corporate context but not the core product. Best fit for risk, compliance and marketing teams that consume identity data rather than build graphs.
What we like- Deep consumer data assets
- Strong in onboarding and data hygiene
- Fraud and risk use cases
Watch out for- Quote-only
- Data licensing terms need legal review
- Now part of a larger corporate parent
Starting priceSee website
Free planFree trial
Treasure Data is an enterprise CDP with identity resolution as a core capability rather than a bolt-on. It unifies customer data from online and offline sources into persistent profiles, with the flexibility to define identity rules that match how your business actually thinks about customers. The integration library is deep, covering the standard marketing and analytics stack.
G2 data indicates a free trial is available, which is more than most vendors in this category offer. Real deployments are enterprise-priced and quote-based, and implementation needs real technical resources. It competes directly with Amperity and Segment for the large-brand CDP buyer, with flexibility as its differentiator.
What we like- Flexible identity resolution inside a full enterprise CDP
- Strong integrations
- Free trial available
Watch out for- Enterprise pricing and implementation
- Needs technical resources
- Quote-based for real deployments
#10
Neustar (TransUnion)
Best for: Identity resolution for regulated industries
Visit home.neustar
Starting priceSee website
Free planNo
Neustar, now part of TransUnion, is the identity vendor for industries where getting identity wrong is expensive: telecom, financial services, government and healthcare. Its authoritative identity data powers number portability infrastructure, caller ID, fraud detection and risk scoring at national scale.
The identity resolution offering inherits that trust and that enterprise weight. Pricing is quote-only, the sales process is built for large organizations, and smaller buyers will find it heavy. For regulated-industry buyers who need an identity partner their compliance team already knows, Neustar's reputation is the reason to shortlist it.
What we like- Trusted in telecom, finance and government
- Authoritative identity data
- Strong fraud and risk tools
Watch out for- Quote-only enterprise pricing
- Brand transition to TransUnion confuses buyers
- Heavyweight for SMB needs
How we chose this list
We started from the vendors named most often in G2, Capterra and TrustRadius identity resolution categories, plus analyst coverage of the identity graph market. For each vendor we checked the company's own pricing page and product documentation to establish whether pricing is published, then verified feature claims against recent reviews and the vendors' own technical docs. We deliberately mixed pure-play identity graph vendors, enterprise CDPs with resolution built in, and data companies, because buyers arrive at this category from all three directions. We never claimed hands-on testing, and where a vendor publishes no price we said so plainly instead of inventing a number.
What to ask on every sales call
Since nearly every vendor here is quote-based, the sales call is the pricing page. Three questions cut through the fog. First, what is the unit of measurement: matches, sessions, monthly tracked users or API calls? Second, what happens at the edges: do you pay for no-match queries, and what does overage cost? Third, who owns the resolved data and what are you allowed to do with it after the contract ends?
Match rates are the real spec sheet
Vendors publish match rates the way phone makers publish battery life: under ideal conditions. Ask for match rates on your data, not their benchmark file, and ask how they handle the identifiers you actually have. A vendor that matches 90% on email addresses but 40% on mobile ad IDs is a different product depending on your data mix. A paid pilot on a sample of your own records is worth more than any demo.
Data rights and privacy terms
Identity data comes with legal strings attached. Confirm whether the vendor pools your customer data into their graph, what retention limits apply, and how they handle deletion requests under state privacy laws. FullContact's no-pooling stance and SOC 2 certification are the kind of terms to look for. Get the data processing terms in writing before the contract, not after.
Frequently asked questions
What is identity resolution software?
It is software that connects fragmented customer identifiers, emails, phone numbers, cookies, device IDs and offline records, into a single view of a person. That unified identity powers personalization, ad targeting, fraud prevention and analytics. Vendors do it with proprietary identity graphs, deterministic matching, probabilistic matching, or a mix.
How much does identity resolution software cost?
It varies enormously. API vendors may charge fractions of a cent per match. CDPs price on monthly tracked users, typically five to six figures annually at enterprise scale. Pure-play graph vendors like LiveRamp and Amperity run custom quotes, usually six figures and up. Almost nobody in this category publishes a price list.
What is the difference between deterministic and probabilistic matching?
Deterministic matching links identifiers with certainty, like matching a login email to a CRM record. Probabilistic matching infers that identifiers belong to the same person based on patterns, like shared devices and behavior. Deterministic is more accurate but covers fewer people; probabilistic extends reach at the cost of some false matches. Most platforms use both.
Do I need a third-party identity graph or is my CDP enough?
If your CDP resolves identities from your own first-party data, that covers personalization and owned-channel use cases for most companies. You need a third-party graph when you must recognize people you have never seen before: prospecting, media targeting, onboarding offline lists, or fraud prevention on anonymous traffic.
How do privacy regulations affect identity resolution?
State privacy laws and GDPR require consent, purpose limitation and deletion rights that flow through to your identity vendor. Ask whether the vendor pools your data, how long they retain it, and how they process deletion requests. Consent-first vendors like Zeotap built for this from day one; US vendors vary, so read the data processing terms.
Can small businesses use identity resolution software?
Yes, through the accessible end of the market. FullContact's API and AtData's pay-as-you-go queries work for smaller budgets, and CDPs like Twilio Segment have entry tiers. The enterprise graph vendors are priced for large companies and will tell you so on the sales call.
Sources we checked (11)
- https://liveramp.com/pricing/
- https://www.fullcontact.com/pricing/
- https://amperity.com/
- https://www.throtle.com/
- https://atdata.com/pricing/
- https://segment.com/pricing/
- https://zeotap.com/
- https://www.infutor.com/
- https://www.treasuredata.com/pricing/
- https://www.home.neustar/
- https://www.trustradius.com/categories/identity-resolution
Is your product missing or out of date?
We review this list regularly. Vendors can request a listing, send updated pricing or ask about featured placement.
Shihab Mia · Founder, Rankite
Shihab has spent more than a decade helping SaaS and e-commerce brands grow through search. He writes Rankite's software buying guides from pricing pages, documentation and public user reviews. More about Shihab.