Independent research on 267 HR & workforce products. Facts checked against vendors’ official documentation.

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LeadChange Group

ASO Services

Administrative Services Organizations (ASO) Comparison

Every administrative services organization product we track, side by side: LeadChange Score, published pricing and verified features, each value checked against the vendor’s own documentation.

products compared
13
By LeadChange Research TeamUpdated Based on 40 sources, most recently checked

LeadChange may earn a fee when you request pricing through our site or follow a sponsored link. Rankings never depend on whether a vendor pays us.We may earn a fee.

ASO Services comparison table

ASO Services comparison: LeadChange Score, pricing and verified service facts
ProductScorePublished pricePayroll tax filingBenefits administrationHR advisoryPricing modelStates served
Paychex HR Pro and HR Partner Plus1–3Scored 7.2/10 in Payroll Software on its own page5.9Not publishedYesYesYesNot publishedEvery state where employees work (multi-state payroll tax handling)
TriNet HR Plus4–6Scored 6.9/10 in PEO Services on its own page5.9Not publishedYesYesYesNot publishedAll 50 states (compliance guidance)
Easeworks ASO7–94.0Quote onlyYesYesYesQuote onlyCalifornia
Connor & Gallagher OneSource ASO10Not scoredQuote onlyNot publishedYesYesQuote onlyNot published
G&A Partners ASO11,12Scored 7.3/10 in PEO Services on its own pageNot scoredNot publishedYesYesYesNot publishedAll 50 states
Insperity HRCore13Scored 5.7/10 in PEO Services on its own pageNot scoredNot publishedNot publishedYesYesNot publishedAll 50 states
XcelHR ASO14,15Not scoredQuote onlyYesYesYesQuote onlyNot published
ADP Comprehensive Services16,17Not scoredQuote onlyYesYesYesQuote onlyNot published
C2 Essentials ASO18–20Not scoredQuote onlyYesYesYesQuote onlyAll 50 states
guHRoo ASO21Not scored$79/employee/mo ($1,000/mo minimum)YesYesYesPer employeeAll 50 states
VertiSource HR ASO22,23Not scoredQuote onlyYesNot publishedNot publishedQuote onlyAll 50 states
AsureWorks24–26Not scoredQuote onlyYesYesNot publishedQuote onlyAll 50 states and territories
INFINITI HR ASO27,28Scored 5.7/10 in PEO Services on its own pageNot scoredNot publishedNot publishedNot publishedYesNot publishedAll 50 states

How many employees would the PEO cover?

Some products only serve certain team sizes: those that do not fit yours drop out.

Frequently asked questions

Which ASO services has the highest LeadChange Score?

Of the 13 ASO services products in this comparison, the highest LeadChange Scores belong to Paychex Flex (5.9/10), TriNet (5.9), and Easeworks ASO (4.0).

Do ASO services publish their prices?

Of the 13 products compared, 1 publishes a list price we can compare at 25 employees and 10 are quote-only (TriNet, Easeworks ASO, Connor & Gallagher OneSource ASO, Insperity (PEO), and 6 more).

Which ASO services in this comparison are IRS-certified PEOs?

Insperity (PEO) (since 2017), INFINITI HR (since 2018), TriNet (since 2018), and G&A Partners (since 2020) are on the IRS public list of certified professional employer organizations (CPEOs). That is 4 of the 13 ASO services in this comparison.

Which ASO services in this comparison have a mobile app?

Paychex Flex, TriNet, G&A Partners, Insperity (PEO), ADP Comprehensive Services, and INFINITI HR confirm a mobile app; 7 of the 13 products in this comparison have none on file.

Which ASO services in this comparison support single sign-on?

TriNet and G&A Partners document single sign-on; 11 of the 13 products in this comparison have none on file.

Which ASO services in this comparison run payroll and file payroll taxes?

Paychex Flex, TriNet, Easeworks ASO, G&A Partners, XcelHR ASO, and 5 more run payroll and file payroll taxes under the client’s own tax ID, according to their own documentation. 3 of the 13 ASO services in this comparison do not publish it.

Which ASO services in this comparison administer the client’s own benefit plans?

Paychex Flex, TriNet, Easeworks ASO, Connor & Gallagher OneSource ASO, G&A Partners, and 6 more administer enrollment and eligibility for the client’s own benefit plans, according to their own documentation. 2 of the 13 ASO services in this comparison do not publish it.

Which ASO services in this comparison give access to HR advisers?

Paychex Flex, TriNet, Easeworks ASO, Connor & Gallagher OneSource ASO, G&A Partners, and 6 more give managers access to HR advisers, according to their own documentation. 2 of the 13 ASO services in this comparison do not publish it.

What support hours do ASO services in this comparison publish?

Paychex Flex: 24/7 payroll support; Easeworks ASO: Mon–Fri, 8 a.m.–6 p.m. Pacific; Insperity (PEO): 7am–7pm CST, Monday–Friday; VertiSource HR ASO: Mon–Fri, 8 a.m.–5 p.m. Mountain. 9 of the 13 ASO services in this comparison do not publish it.

How we research

Ranked by the LeadChange Score, computed only from verified facts: capability coverage (30%), pricing and value (20%), integrations and API (15%), security (15%), fit and support (10%) and data confidence (10%), times a category fit. Products with too few verified facts are not scored yet and come last. Payment never changes a score or a position.

Read the full methodology

Facts, not impressions · Missing data is never assumed · Independent of revenue · Scored as a service

  • Facts, not impressions

    Every input is a fact verified against vendors’ official documentation, with the date we last checked it.

  • Missing data is never assumed

    Unverified items are left out of the score and lower its coverage; below 60% coverage a product is not scored yet.

  • Independent of revenue

    Rankings never depend on whether a vendor pays us.

  • Scored as a service

    Service checks replace software ones: SOC 1 or SOC 2 report, HIPAA, public registrations (IRS CPEO, ESAC), file feeds, named integrations, support hours and implementation time, not webhooks, SSO, SCIM, ISO 27001, GDPR or a free trial.

How this page was made

  • What it is built from

    42 verified facts, each checked against the vendor's own pages or another primary source, most recently on Nov 11, 2026.

  • Method

    Scored and compared with the LeadChange methodology, version 1.5. Read the methodology

  • Independent review

    Not reviewed yet by our independent reviewer. How we review

  • Hands-on testing

    We have not tested these products hands-on: this page uses public information only.

  • Who made it

    The LeadChange Research Team, following a written research process. No named expert has reviewed this page. About us

  • Independence and errors

    Who pays us never changes a score or a rank. If something here is wrong, tell us and we correct it publicly. Request a correction

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Sources

The 40 pages this page's facts come from. The date beside each is our last check of the facts taken from it (the oldest, when they differ). The numbers beside the figures above link here.

Quotes from the sources
  1. Paychex paychex.com/human-resources/hr-packages
  2. Paychex paychex.com/human-resources
  3. Paychex paychex.com/payroll“Paychex automatically manages the calculation, withholding, and remittance of taxes for every state where your employees work, streamlining multi-state payroll tax compliance with less manual oversight.”
  4. TriNet trinet.com/hr-plus/capabilities
  5. TriNet TriNet HR Plus - TriNet
  6. TriNet trinet.com/hr-compliance“Yes. TriNet stays on top of changes across all 50 states and provides best practice guidance for your locations.”
  7. Easeworks easeworks.com/pricing“Why isn't there a price list on this page?” “Your current costs next to the Easeworks number, item by item — admin fee included, nothing folded in or hidden.”
  8. Easeworks easeworks.com/aso
  9. Easeworks easeworks.com/aso-pricing-california“Serving California since 2000”
  10. Connor & Gallagher OneSource gocgo.com/aso-provider“EXPLORE CGO'S ASO SOLUTION” “CGO can review your current structure and help determine whether an integrated ASO model makes sense for your organization.”
  11. G&A Partners G&A Partners: ASO
  12. G&A Partners gnapartners.com/hr-compliance“Serving small and mid-sized businesses across all 50 states, we help equip you to meet the diverse regulatory requirements of each jurisdiction.”
  13. Insperity Insperity HRCore“Insperity HRCore is currently available in the U.S. Insperity operates in all 50 states and has 80+ locations around the country.”
  14. XcelHR xcelhr.com/services/peo-and-aso“Please review and compare our PEO & ASO solutions.” “Contact us to learn more 1.800.776.0076”
  15. XcelHR xcelhr.com/resources/what-is-an-aso
  16. ADP adp.com/what-we-offer/products/adp-comprehensive-services/compare-options.aspx“*Services available for an additional fee” “Talk to sales 800-225-5237 Let's Talk”
  17. ADP ADP Comprehensive Services
  18. C2 Essentials c2essentials.com/aso“Select only the HR services you need, tailored to your business—no unnecessary extras.”
  19. C2 Essentials c2essentials.com/contact“Fill out the form and a C2 specialist will reach out within a few business days to answer your questions or schedule your demo.”
  20. C2 Essentials c2essentials.com/who-we-are“Today, C2 serves clients in all 50 states and overseas”
  21. guHRoo guhroo.co/pricing“$79*” “Per Employee Per Month (PEPM)”
  22. VertiSource HR vertisourcehr.com/pricing“This is an estimate, not a final quote. Your specialist confirms pricing and fits the plan to your business, not ours.” “Pricing depends on your headcount, the states you operate in, and the services you choose.”
  23. VertiSource HR vertisourcehr.com/peo-vs-aso
  24. Asure Software asuresoftware.com/payroll-hr-outsourcing“Hand off the payroll. Keep the control.” “Get Pricing”
  25. Asure Software investor.asuresoftware.com/news-releases/news-release-details/asure-software-launches-asureworks-done-you-payroll-and-hr
  26. Asure Software asuresoftware.com/about-us“With headquarters in Austin, TX and offices throughout the United States, Asure provides HCM software and services in every state and territory.”
  27. INFINITI HR Administrative Services Organization - INFINITI HR
  28. INFINITI HR infinitihr.com/about“Our services cater to businesses of all sizes, navigating diverse workforces across all 50 states.”
  29. Internal Revenue Service irs.gov/pub/irs-sbse/active-cpeos.pdf“Insperity PEO Services, L.P. 19001 Crescent Springs Drive KINGWO OD TX 77339 US 1/1/2017” “INFINITI HR, LLC 3905 National Drive Suite 400 BURTONS MD 20866 US 10/1/2018”
  30. Paychex paychex.com/apps/mobile-app“Employees can download the Paychex Flex® app for free from the Apple App Store or Google Play Store and log in using their Paychex account credentials.”
  31. TriNet trinet.com/peo“Our platform also lets your employees view pay stubs and request time off conveniently from our mobile app.”
  32. G&A Outsourcing, Inc. apps.apple.com/us/app/g-a-partners-mobile/id1550192429“G&A Partners - Mobile application enables an employee to view important details such as payroll information, download a paystub, view and request PTO, punch in and out via an online timeclock, see an organizational chart and manage their WorkSight account details.”
  33. Insperity, Inc. (App Store listing) apps.apple.com/us/app/id674606949“Insperity Mobile is now in sync with your active lifestyle. Quick, easy access to your 401k, paycheck information, FSA, UHC benefits card and more.”
  34. INFINITI HR infinitihr.com/media/releases/infiniti-hr-unveils-new-mobile-app-for-enhanced-employee-management“The INFINITI HR mobile app is now available for download on the App Store and Google Play.”
  35. TriNet trinet.com/customer-resource-center/technology/integration-center“Identity Providers and Single Sign-on – Microsoft® Azure, Google™ Cloud, Okta™, OneLogin™”
  36. G&A Partners gnapartners.com/hr-technology“G&A Partners simplifies HR by centralizing key functions into a single integrated platform with a single sign-on (SSO).”
  37. Paychex paychex.com/corporate/security“Payroll support is available 24/7, 365 days per year.”
  38. Easeworks easeworks.com/contact“Business hours Mon–Fri: 8AM–6PM PST”
  39. Insperity insperity.com/customer-support“Our call hours are open from 7am – 7pm CST, Monday – Friday.”
  40. VertiSource HR vertisourcehr.com/contact“Call us 855-565-8747 Mon–Fri, 8am–5pm Mountain Time. A specialist answers during business hours.”