# Coupa vs SAP Ariba: Modules, ERP Fit and Cost to Run

- Source: https://procuretechguide.com/procurement/coupa-vs-sap-ariba/
- Publisher: Procure Tech (procuretechguide.com)
- Byline: Procurement Desk (a Procure Tech desk; a team label, not an individual)
- Published: 2026-10-26
- Updated: 2026-11-04
- Facts last verified: 2026-10-26
- How we rank: https://procuretechguide.com/how-we-rank/

## Short answer

Coupa is the better pick for most buyers, scoring 8.2 out of 10 against 7.9 for SAP Ariba, with a wider single platform and no fees for suppliers on its portal. SAP Ariba is the safer choice when SAP S/4HANA or SAP ERP 6.0 runs finance, because SAP maintains the integration.

## Key takeaways

- Coupa scores 8.2 and SAP Ariba 7.9 out of 10, the same as in our 15-platform ranking.
- Coupa lists pricing from $50k a year on AWS Marketplace; SAP lists Strategic Procurement at USD 2,420 per user per month.
- SAP prices Ariba Buying and Invoicing on total spend processed, over 3 to 5 year terms.
- Coupa does not charge suppliers for its portal; SAP Enterprise supplier accounts pay up to USD 5,500 a year plus a transaction fee.
- SAP ERP 6.0 mainstream maintenance ends December 31, 2027, which should shape the timing of an SAP Ariba project.

Coupa vs Ariba is rarely decided on features, because both suites cover sourcing, contracts, buying and invoices. The deciding question is which ERP sits underneath and who pays to run the supplier network. If you are still choosing between a suite and a lighter tool, start with our [guide to choosing procurement software](https://procuretechguide.com/procurement/procurement-software/).

This head-to-head compares modules, ERP fit, buyer pricing and supplier fees, using only Coupa and SAP pages read on October 26, 2026. Both suites sit in the top three of our [15-platform procurement software ranking](https://procuretechguide.com/procurement/best-procurement-software/), and we keep the same scores here. For the wider field of suites beyond these two, see our [ranking of the best source-to-pay suites](https://procuretechguide.com/procurement/best-source-to-pay-suites/). If Ivalua or JAGGAER is also on your list, our [Ivalua vs Coupa vs JAGGAER comparison](https://procuretechguide.com/procurement/ivalua-vs-coupa-vs-jaggaer/) covers that three-way choice. If you only need the buying and invoice steps, our [source-to-pay vs procure-to-pay](https://procuretechguide.com/procurement/source-to-pay-vs-procure-to-pay/) explainer and ranking of [procure-to-pay software](https://procuretechguide.com/procurement/procure-to-pay-software/) cover lighter options.

## Coupa vs Ariba: which suite should you buy in 2026?

Buy Coupa if you run a mixed or non-SAP ERP estate and want one platform from sourcing to payment, with no fees for suppliers on a standard portal account. Buy SAP Ariba if SAP S/4HANA or SAP ERP runs finance, because SAP connects them natively. Coupa scores 8.2 and SAP Ariba 7.9 in our ranking.

| Rank | Suite | Best for | Published buyer price | Supplier fees | Our score |
| --- | --- | --- | --- | --- | --- |
| 1 | Coupa | Mixed or non-SAP ERP estates that want one platform | From $50k a year, billed annually, on 3 or 5 year terms (AWS Marketplace) | None on a standard Coupa Supplier Portal account | 8.2 |
| 2 | SAP Ariba | SAP S/4HANA and SAP ERP 6.0 estates | Strategic Procurement lists USD 2,420 per user per month; Buying and Invoicing is priced on spend, on request | Free Standard account; Enterprise accounts pay a subscription plus a transaction fee | 7.9 |

Coupa vs SAP Ariba at a glance. Scores are out of 10 and match our 15-platform ranking. Prices checked on vendor pages on October 26, 2026.

Our pick

**Coupa**

Coupa wins for most buyers because it sells a wider module catalogue on one platform and does not charge suppliers to use its portal, per its [supplier portal FAQ](https://docs.coupa.com/en/supplier-documentation/coupa-for-suppliers/the-coupa-supplier-portal-or-csp/coupa-supplier-portal-registration-and-login/csp-account-login-and-registration-faq). For an SAP-first company, SAP Ariba is the safer integration bet and the gap in our scores is small.

| If your situation is | Look at | The line item to watch |
| --- | --- | --- |
| One SAP ERP runs everything and spend is mostly catalog or repeat buying | Your ERP’s own purchasing first, then SAP Ariba Buying and Invoicing | Spend-based pricing as volume grows |
| SAP plus other ERPs after acquisitions | Both suites; test each connector against every ERP | Middleware and integration services |
| NetSuite, Oracle, Microsoft or Workday as the system of record | Coupa first | Connector licences such as the Coupa OBN licence for NetSuite POs |
| Requests arrive by email and only intake is broken | A point tool for intake before either suite | Paying for suite modules you will not switch on |

Suite, module or point tool? A decision guide from the Procurement Desk.

## What does each suite do best?

Coupa does breadth best: one platform runs from supply chain design and sourcing to invoicing, payments, expense and treasury. SAP Ariba does SAP fit best: SAP builds and maintains the gateway into SAP ERP and S/4HANA, and its supplier network spans more than 190 countries. Each has one cost line that deserves a hard look.

### 1. Coupa

Image: Coupa, aws.amazon.com, captured October 26, 2026.

- **Best for:** Mixed or non-SAP ERP estates that want one platform from sourcing to payment
- **Pricing from:** From $50k a year, billed annually, on 3 or 5 year terms, per its AWS Marketplace listing
- **Standout:** A network of 11M+ buyers and suppliers and a $10 trillion+ spend dataset, per Coupa
- **Verified:** October 26, 2026

Coupa lists sourcing, contracts, supplier risk, intake, procurement, invoicing, payments, expense, spend analysis and treasury on its [platform page](https://www.coupa.com/platform/). Its [AWS Marketplace listing](https://aws.amazon.com/marketplace/pp/prodview-6m4z7clvco2aa) says pricing starts at $50k, billed annually, for 3 or 5 year terms, with a 36-month entry shown at $150,000. Real quotes come as custom private offers. Our [Coupa pricing guide](https://procuretechguide.com/procurement/coupa-pricing/) breaks down what drives that quote.

#### Strengths

- The widest single-platform module list of the two
- Suppliers transact free on a standard portal account, per its [Verified FAQ](https://supplier.coupa.com/verified-faqs/)
- FedRAMP Moderate, SOC 1, SOC 2 and ISO 42001 on its [compliance page](https://www.coupa.com/compliance-security/)

#### Watch-outs

- SAP integration runs on flat files or APIs that your team or partner maps
- The $50k entry price does not say which modules it covers
- Easy to buy modules that stay switched off

[Visit Coupa](https://www.coupa.com/)

### 2. SAP Ariba

Image: SAP Ariba, www.sap.com, captured October 26, 2026.

- **Best for:** Companies running SAP S/4HANA or SAP ERP 6.0
- **Pricing from:** Buying and Invoicing priced on spend processed, on request; Strategic Procurement at USD 2,420 per user per month
- **Standout:** Next-gen SAP Ariba on SAP BTP, with no commercial implications for existing customers who move, per SAP
- **Verified:** October 26, 2026

SAP sells SAP Ariba in two packages: Buying and Invoicing, priced on the total spend the service processes, per its [pricing page](https://www.sap.com/products/spend-management/procure-to-pay/pricing.html), and SAP Strategic Procurement for sourcing, contracts and supplier management. The [spend management pricing page](https://www.sap.com/products/spend-management/pricing.html) lists Strategic Procurement at USD 2,420 per user per month with a 5-user minimum.

#### Strengths

- Native gateway into SAP ERP and S/4HANA, maintained by SAP
- Multi-ERP configuration included in Buying and Invoicing
- Joule Base AI included in spend management plans at no extra cost

#### Watch-outs

- Suppliers on Enterprise accounts pay subscription and transaction fees
- The spend metric depletes with usage, so growth raises the bill
- Expense and contingent labour sit in separate SAP products

[Visit SAP Ariba](https://www.sap.com/products/spend-management.html)

## How do Coupa and SAP Ariba compare on modules?

Both suites cover every stage from intake and sourcing to invoice. The difference is packaging: Coupa sells one platform that also runs payments, expense, treasury and supply chain design. SAP splits Ariba into a spend-based buying package and a user-based sourcing package, and sells expense as SAP Concur and contingent labour as SAP Fieldglass.

| Stage | Coupa | SAP Ariba |
| --- | --- | --- |
| Intake | Intake and Orchestration, powered by the Tonkean acquisition | SAP Ariba Intake Management, globally available since March 2026 |
| Sourcing | Sourcing and Advanced Sourcing Optimization | Sourcing with a Sourcing Assistant; direct materials sourcing add-on |
| Contracts | Contract Management | Contract management, plus an Icertis integration in next-gen SAP Ariba |
| Supplier management | Supplier Risk and Performance | Supplier Lifecycle and Performance, with nine supplier agents |
| Buying and catalogs | Procurement, Inventory Management, Services Procurement | Requisitions, approvals, orders, receiving and catalogs in Buying and Invoicing |
| Invoices and AP | AP Automation, Invoicing, Fraud Detection | Invoice management in Buying and Invoicing |
| Payments and treasury | Payments, Virtual Cards, Treasury and Cash Management | Payment steps listed; no treasury module on the pages we checked |
| Expense | Coupa Expense | Sold separately as SAP Concur |
| Spend analysis | Spend Analysis | SAP Ariba Spend Analysis; Spend Analytics Assistant planned for Q1 2027 |
| Direct materials | Supply Chain Optimization and Supply Chain Collaboration | Direct materials source-to-contract on the strategic sourcing page |

Module coverage matrix built only from Coupa and SAP pages checked October 26, 2026.

Sources: the Coupa [platform page](https://www.coupa.com/platform/) and its [September release notes](https://www.coupa.com/newsroom/coupas-september-release-accelerates-agentic-spend-capabilities/); SAP’s [procure-to-pay page](https://www.sap.com/products/spend-management/procure-to-pay.html), [source-to-contract page](https://www.sap.com/products/spend-management/strategic-sourcing-and-contracts.html), [spend management page](https://www.sap.com/products/spend-management.html) and its [next-gen SAP Ariba announcement](https://news.sap.com/2026/03/next-gen-sap-ariba-foundation-for-intelligent-procurement/). In practice, the matrix is closer than the marketing suggests.

## Which suite fits your ERP better?

SAP Ariba fits SAP ERP and S/4HANA better, because SAP’s managed gateway connects one or several SAP systems directly or through middleware. Coupa integrates with SAP through standard flat files or REST APIs, often mixed, and ships its own certified NetSuite bundles. For Oracle, Microsoft or Workday finance, Coupa is usually the cleaner fit. See our [Coupa vs Oracle Procurement vs Workday comparison](https://procuretechguide.com/procurement/coupa-vs-oracle-procurement-vs-workday/) for Oracle and Workday shops.

| Your ERP | Coupa | SAP Ariba |
| --- | --- | --- |
| SAP S/4HANA or SAP ERP 6.0 | Standard flat files or REST APIs, often combined, with Coupa guiding the choice during implementation | SAP Integration Suite, managed gateway for spend management, formerly Ariba Cloud Integration Gateway; single or multiple SAP ERPs |
| NetSuite | Coupa-built bundles certified under Built for NetSuite; P2P bundle 22.0.2 released October 8, 2026 | Multi-ERP configuration is included; ask which connector covers NetSuite |
| Oracle, Microsoft, Infor or Workday | Integrates with any ERP, usually through middleware such as MuleSoft, per a 2021 Coupa paper | Multi-ERP configuration is included; confirm the connector and who maintains it |
| Several ERPs after acquisitions | One platform over all of them through files, APIs or middleware | Federated processes across multiple ERPs, per SAP’s procure-to-pay page |

ERP fit, from Coupa integration playbooks and SAP’s managed gateway configuration guide, checked October 26, 2026.

The detail is on each vendor’s own documentation: Coupa’s [SAP integration playbook](https://compass.coupa.com/en-us/products/total-spend-management-platform/integration-playbooks-and-resources/erp-integration-playbooks/sap-integration-playbook) and [NetSuite playbook](https://compass.coupa.com/en-us/products/total-spend-management-platform/integration-playbooks-and-resources/erp-integration-playbooks/netsuite-integration-playbook), which notes that sending purchase orders into Coupa needs a Coupa OBN licence, and SAP’s [managed gateway configuration guide](https://help.sap.com/doc/8d88f366939e43b29af891cf62836ab7/2608/en-US/CIGConfig.pdf). Coupa’s [2021 paper for IT leaders](https://get.coupa.com/rs/950-OLU-185/images/Coupa-Platform_for_IT_Leaders.pdf) names SAP, Oracle, NetSuite, Microsoft, Infor and Workday.

Timing matters for SAP shops. Mainstream maintenance for SAP ERP 6.0 on enhancement packages 6 to 8 runs until December 31, 2027, with optional extended maintenance to 2030 at extra cost, per SAP’s [maintenance timeline post](https://community.sap.com/t5/enterprise-resource-planning-blog-posts-by-sap/maintenance-timelines-for-sap-erp-6-0-quot-ecc-quot/ba-p/13524564). If an S/4HANA move is already funded, the line item to watch is rework of the procurement integration halfway through it.

## How much do Coupa and SAP Ariba cost?

Neither vendor publishes a full price list. Coupa’s AWS Marketplace listing starts at $50k a year, billed annually, on 3 or 5 year terms. SAP prices Ariba Buying and Invoicing on total spend processed, on request, over 3 to 5 years, and lists SAP Strategic Procurement at USD 2,420 per user per month.

| Line item | Coupa | SAP Ariba |
| --- | --- | --- |
| Published entry price | From $50k a year, billed annually; the 36-month listing shows $150,000 | Strategic Procurement: USD 2,420 per user per month, minimum 5 users; Buying and Invoicing: price on request |
| Billing metric | Contract duration and terms; real quotes arrive as custom private offers | Buying and Invoicing: total spend processed, a yearly entitlement that depletes with usage; Strategic Procurement: users |
| Contract term | 3 or 5 years | 3 to 5 years for Buying and Invoicing; 3 months to 3 years for Strategic Procurement, both auto-renewing |
| Included in the base | Not itemised on the listing | One productive and one test tenant, plus multi-ERP configuration, in Buying and Invoicing |
| AI | Coupa Compose sold on an outcome-based pricing model | Joule Base included in spend management plans at no additional cost |
| Extras to price | Coupa Catalyst services, connector licences, middleware | Supplemental and additional site add-ons; direct materials sourcing add-on |

How the bill is built, from Coupa’s AWS Marketplace listing and SAP’s pricing pages, checked October 26, 2026.

Read the SAP list price carefully. Five users at USD 2,420 a month is USD 12,100 a month, or USD 145,200 a year before discounts, and the [pricing page](https://www.sap.com/products/spend-management/pricing.html) applies it to public cloud deployments outside S/4HANA. Coupa’s figures come from its [AWS Marketplace listing](https://aws.amazon.com/marketplace/pp/prodview-6m4z7clvco2aa), and its [Compose announcement](https://www.coupa.com/newsroom/coupa-launches-coupa-compose-and-catalyst-to-accelerate-agentic-ai-value-and-delivery-at-inspire-2026/) describes the outcome-based AI pricing.

For most mid-market teams, both entry points are a signal to check whether a suite is needed at all. For enterprises, the line item to watch is Ariba’s spend metric, which rises as more spend flows through the system.

## Do suppliers pay to trade with you on each network?

On Coupa, no: Coupa says it does not charge suppliers to use the Coupa Supplier Portal, and a standard account has unlimited transactions for no fee. On SAP Business Network, a Standard account is free, but an Enterprise account pays a yearly subscription plus a 0.155% to 0.35% transaction fee once it passes SAP’s thresholds.

Image: Procure Tech calculation from SAP’s published supplier fee schedule and Coupa’s supplier portal FAQ. Vendor logos belong to their owners. Data checked October 26, 2026.

| SAP subscription level | Documents a year | Annual subscription fee |
| --- | --- | --- |
| Premium | Up to 4 | No cost |
| Bronze | 5 to 24, or under USD 250,000 | USD 50 |
| Silver | 25 to 99 | USD 750 |
| Gold | 100 to 499 | USD 2,250 |
| Platinum | 500 or more | USD 5,500 |

SAP Business Network Enterprise account subscription levels, from SAP support article KB0399773, checked October 26, 2026.

An Enterprise account becomes chargeable after 5 documents and USD 50,000 with any one customer, and then every relationship is chargeable, per SAP’s [support article](https://support.ariba.com/Item/view/KB0399773). The transaction fee is 0.155%, or 0.35% with service entry sheets, capped at USD 20,000 per buyer relationship a year, per the [SAP Learning fee course](https://learning.sap.com/courses/overview-of-sap-business-network/discussing-the-sap-business-network-supplier-fees_e4deac90-bef8-4e86-a86b-08d526286a4b).

The worked examples in the chart follow those rules: a supplier with 250 documents and USD 600,000 a year pays USD 2,250 plus USD 930, or USD 3,180. The free Standard account lacks system-to-system integration and invoice archiving, per SAP’s [supplier pricing page](https://www.sap.com/products/business-network/suppliers/pricing.html). The deciding question is which account your large suppliers will need.

## How do the Coupa and SAP Ariba AI roadmaps compare?

Coupa ships more AI that is generally available today: Navi Agent Studio went live in May 2026 and its September release added MCP access through Navi Connect with 30+ tools. SAP rebuilt next-gen SAP Ariba on SAP BTP in March 2026 and has several assistants and partner extensions planned for November 2026 to Q1 2027.

Image: Procure Tech timeline from Coupa and SAP announcements. Vendor logos belong to their owners. Data checked October 26, 2026.

Coupa says 400+ custom agents have been built since Agent Studio launched, and that MCP access is auditable and inherits each user’s permissions, per its [September release](https://www.coupa.com/newsroom/coupas-september-release-accelerates-agentic-spend-capabilities/). Its [Compose launch](https://www.coupa.com/newsroom/coupa-launches-coupa-compose-and-catalyst-to-accelerate-agentic-ai-value-and-delivery-at-inspire-2026/) lists more than 20 persona agents and forward deployed engineers through Coupa Catalyst.

SAP’s [next-gen announcement](https://news.sap.com/2026/03/next-gen-sap-ariba-foundation-for-intelligent-procurement/) adds a Bid Analysis Agent and lets existing customers move without commercial implications, running both environments in parallel. Its [October 2026 update](https://news.sap.com/2026/10/next-chapter-spend-management-ai-innovations-sap-ariba-sap-fieldglass-sap-concur/) plans Moody’s supplier risk inside SAP Ariba for Q4 2026 and ORO Labs orchestration for November 2026. Buy on what is generally available today.

## Who owns each vendor, and how do analysts rate them?

Thoma Bravo has owned Coupa since February 2023, after an all-cash deal valued at about $8.0 billion. SAP Ariba is part of SAP, a public company. Both vendors say Gartner named them Leaders in the 2026 Magic Quadrant for Source-to-Pay Suites, with Coupa citing its third year in a row.

| Fact | Coupa | SAP Ariba |
| --- | --- | --- |
| Ownership | Private, owned by Thoma Bravo since February 28, 2023 | Part of SAP |
| 2026 Gartner S2P Magic Quadrant | Leader, third year running, per Coupa | Leader, per SAP |
| Network scale stated by the vendor | 11M+ buyers and suppliers | More than 190 countries |
| Customer claim | 55% of the Fortune 500 work with Coupa | Not stated as a share on the pages we checked |
| Security and compliance | FedRAMP Moderate, SOC 1, SOC 2, ISO 27001:2022, ISO 27701, ISO 42001, PCI | FedRAMP among its certifications, per SAP |
| Recent deals | Rossum and Tonkean integrated; Scoutbee acquisition announced | ORO Labs orchestration extension; Moody’s and Icertis partnerships |

Ownership and standing as each vendor states it, checked October 26, 2026.

Sources: Coupa’s [acquisition announcement](https://www.coupa.com/newsroom/thoma-bravo-completes-acquisition-coupa-software/), [home page](https://www.coupa.com/) and [compliance page](https://www.coupa.com/compliance-security/); SAP’s [Magic Quadrant announcement](https://news.sap.com/2026/01/sap-leader-gartner-magic-quadrant-source-to-pay-suites/). Ownership matters less than roadmap delivery, so put renewal caps into the first contract with either vendor.

### How we compared

We read product, pricing, integration, security and supplier fee pages from both vendors on October 26, 2026, and did not run hands-on trials. Analyst placements are reported as each vendor states them, because the Gartner report sits behind a licence. Supplier fee examples are our arithmetic from SAP’s published schedule.

Scores of 8.2 for Coupa and 7.9 for SAP Ariba come from our 15-platform ranking, so the two articles agree. [Read our ranking method](https://procuretechguide.com/how-we-rank/).

## When is your ERP’s own purchasing module enough?

Your ERP’s purchasing module is enough when one ERP runs the business, most spend goes through catalogs or repeat suppliers, and nobody runs competitive sourcing events. In that case neither Coupa nor SAP Ariba pays back quickly. Add a suite when sourcing, contracts or supplier data start drifting into email and spreadsheets. If only contracts are drifting, a dedicated tool may be enough, and our guide to [procurement contract management software](https://procuretechguide.com/contracts/contract-management-software-for-procurement/) ranks eight of them, while our [Conga vs DocuSign CLM vs Agiloft](https://procuretechguide.com/contracts/conga-vs-docusign-clm-vs-agiloft/) guide compares three CLM platforms head to head.

- A second ERP arrived with an acquisition
- Sourcing events still run on email threads
- Contract renewals are tracked in a spreadsheet
- Supplier risk checks happen once a year, if at all
- AP still keys invoices in by hand

Two of these signals usually justify a suite. One signal usually justifies a point tool instead.

## Which should you choose for your situation?

Choose by ERP first, by supplier base second and by roadmap third. SAP-first companies should start with SAP Ariba, while mixed or non-SAP estates should start with Coupa. Companies with many small suppliers should weigh Coupa’s free supplier portal, and teams with an S/4HANA move under way should time the procurement project around it. If Coupa is in place and the renewal is near, our [Coupa alternatives guide](https://procuretechguide.com/procurement/coupa-alternatives/) covers replacement suites and intake tools that sit on top. If SAP Ariba is the contract up for renewal, our [SAP Ariba alternatives guide](https://procuretechguide.com/procurement/sap-ariba-alternatives/) does the same job for it.

The verdict

- **Choose Coupa if** NetSuite, Oracle, Microsoft or Workday runs finance.
- **Choose Coupa if** you want expense, payments and treasury on the same platform as procurement.
- **Choose Coupa if** many small suppliers would resist network fees.
- **Choose SAP Ariba if** SAP S/4HANA or SAP ERP 6.0 is your system of record.
- **Choose SAP Ariba if** you already run SAP Concur or SAP Fieldglass and want one vendor.
- **Choose SAP Ariba if** your suppliers already trade on SAP Business Network.
- **Choose neither yet if** one ERP and catalog buying cover most of your spend.

Whichever way you lean, price the same scenario with both vendors: users, spend through the system, ERPs, legal entities and supplier count. For the wider decision between suites and lighter tools, our [procurement software buying guide](https://procuretechguide.com/procurement/procurement-software/) covers the alternatives.

## Frequently asked questions

**Is Coupa better than SAP Ariba?**

For most buyers, yes. Coupa scores 8.2 out of 10 in our ranking against 7.9 for SAP Ariba, thanks to a wider single-platform module list and free supplier portal accounts. SAP Ariba is the better choice when SAP S/4HANA or SAP ERP 6.0 runs finance, because SAP maintains the integration gateway.

**How much does SAP Ariba cost?**

SAP prices SAP Ariba Buying and Invoicing on the total spend processed by the service, on request, with 3 to 5 year contracts. SAP Strategic Procurement, which covers sourcing, contracts and supplier management, lists USD 2,420 per user per month with a minimum of 5 users and contracts from 3 months to 3 years.

**How much does Coupa cost?**

Coupa does not publish a price list on its own site. Its AWS Marketplace listing says pricing starts at $50k, billed annually, for 3 or 5 year terms, and shows a 36-month entry at $150,000. Real quotes arrive as custom private offers, so ask which modules and users the entry price includes.

**Do suppliers pay to use Coupa or SAP Ariba?**

Coupa says it does not charge suppliers to use the Coupa Supplier Portal. SAP Business Network offers a free Standard account, but Enterprise accounts pay a yearly subscription of USD 50 to USD 5,500 plus a 0.155% to 0.35% transaction fee, capped at USD 20,000 per buyer relationship.

**Does Coupa integrate with SAP S/4HANA?**

Yes. Coupa’s SAP integration playbook describes standard flat files for master and transaction data and REST APIs for more advanced integration, often through a middleware platform. Coupa guides the choice during implementation. SAP Ariba instead uses SAP’s own managed gateway, which SAP builds and maintains for SAP ERP systems.

**Can SAP Ariba work with a non-SAP ERP?**

Yes. SAP says SAP Ariba Buying and Invoicing includes multi-ERP configuration and supports federated processes across several ERPs. The managed gateway guide focuses on SAP ERP systems, so ask SAP which connector covers your non-SAP ERP, who maintains it, and whether it is priced as a separate service.

**How long does a Coupa implementation take?**

Coupa said in a 2021 paper for IT leaders that its average deployment time for large enterprises is between 6 and 9 months. SAP does not publish an average SAP Ariba timeline on the pages we checked. Ask both vendors for a dated plan that names the ERP connectors and supplier onboarding waves.