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
- The cheapest way in is free: Ramp ($0/user/month) and Melio's Go plan ($0) both include invoice capture and approval workflows, which is enough for many small businesses.
- Per-user pricing (BILL from $49/user/month) punishes companies where many people touch invoices. Unlimited-user pricing (Tipalti from $99/month) plus transaction fees often costs less at scale.
- Mid-market buyers choosing between Stampli, Airbase (now Paylocity for Finance) and AvidXchange should expect custom quotes and sales-led evaluations; none publish prices.
- Plooto (C$32/month) is the quiet value pick for small businesses that want approval workflows plus domestic and international payments without per-user fees.
Quick comparison
| Tool | Best for | Starting price | Free plan |
|---|
 Stampli | Finance teams that want AP built around their existing ERP | See website (custom quote; no public pricing) | No |
 BILL | Small and midsize businesses wanting AP, AR and expenses on one platform | $49/user/month (Essentials); Team $65; Corporate $89; Enterprise custom | No (30-day free trial; Spend & Expense module is free) |
 Tipalti | Companies paying suppliers, contractors or partners across borders | $99/month (Accounts Payable plan; unlimited users, plus per-transaction fees) | No |
 Ramp | Teams that want corporate cards, expenses and AP automation for free | Free ($0/user/month); Plus $15/user/month plus platform fee | Yes |
 Airbase | Mid-market companies wanting procure-to-pay control in one system | See website (custom quote; no public pricing) | No |
 AvidXchange | Mid-market AP teams that want a large supplier payment network | See website (custom quote; no public pricing) | No |
 MineralTree | Mid-market finance teams automating invoice-to-pay end to end | See website (custom quote; vendor lists from $5,000/year usage-based) | No |
 Plooto | Small businesses and accounting firms wanting approvals plus international payments | C$32/month (Grow); Go C$9/month for firms; Pro by quote | No (30-day free trial, no credit card required) |
 Melio | Small businesses that want simple, affordable bill pay with approvals | Free (Go plan); Core $25/month; Boost $55/month; Unlimited $80/month; Platinum custom | Yes (Go: 1 user, 5 free ACH payments per month) |
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.
The best invoice approval software
The invoice sits in someone's inbox for eleven days. Nobody knows who approved it, finance finds the duplicate payment at month end, and the vendor calls asking where the money is. Invoice approval software exists to kill that exact week. The best invoice approval software captures the invoice, routes it to the right approvers, matches it against purchase orders, and pays it, with an audit trail showing every step.
Nine tools made this list, from free plans that handle the basics to enterprise-grade platforms for multi-entity finance teams. Each entry shows the real price, whether a free plan exists, and the honest tradeoff.
#1
Stampli
Best for: Finance teams that want AP built around their existing ERP
Visit stampli.com
Starting priceSee website (custom quote; no public pricing)
Free planNo
Stampli's pitch is that it adapts to your ERP instead of replacing it. Invoices are captured, coded with AI assistance, and routed through approval chains that mirror your chart of accounts and approval hierarchy. The differentiator reviewers cite most is the collaboration model: approvers comment and ask questions directly on the invoice, which cuts the email chains that slow most approval processes down.
The commercial reality is enterprise-shaped. Stampli publishes no prices, offers no free trial, and sells through a quote process. Reviewers describe it as premium-priced. For a mid-market or larger company with a complex ERP setup, the fit is strong. For a small business that wants a price today, the free and low-cost options below will get you running faster.
What we like- Approval collaboration happens on top of the invoice itself, so questions and decisions stay attached to the document
- 70-plus ERP integrations including NetSuite, Sage Intacct and Microsoft Dynamics
Watch out for- No public pricing and no free trial, so evaluation starts with a sales call
- Positioned at the higher end of the market per reviewer feedback
#2
BILL
Best for: Small and midsize businesses wanting AP, AR and expenses on one platform
Visit bill.com
Starting price$49/user/month (Essentials); Team $65; Corporate $89; Enterprise custom
Free planNo (30-day free trial; Spend & Expense module is free)
BILL is the default financial operations platform for US small businesses. The AP side covers the full cycle: invoice capture, approval routing based on company policy, and payments by ACH, check, card or international wire. Two-way sync with the major accounting systems means approved bills land in the books without re-entry. The Spend & Expense module with corporate cards is free, which makes the combined offering hard to ignore for card-heavy teams.
The math to watch is per-user. Essentials at $49 per user per month is fine for a five-person finance team and painful when twenty budget owners need approval access. Add the per-transaction ACH fees and the bill climbs with volume. BILL suits businesses that want one vendor for AP, AR and expenses and are willing to pay per seat for it.
What we like- One platform for bills, invoices, expenses and corporate cards with two-way sync to QuickBooks, Xero, NetSuite and Sage Intacct
- Approval workflows with role-based routing
Watch out for- Per-user pricing adds up when many employees touch the system
- Transaction fees ($0.59 per ACH on some plans) sit on top of the subscription
#3
Tipalti
Best for: Companies paying suppliers, contractors or partners across borders
Visit tipalti.com
Starting price$99/month (Accounts Payable plan; unlimited users, plus per-transaction fees)
Free planNo
Tipalti is the global pick. Where most tools charge per user, Tipalti charges a platform fee starting at $99 per month with unlimited users, then prices per transaction. That model favors companies where dozens of people approve but invoice volume is manageable. The global payments engine is the real differentiator: supplier onboarding, tax form collection, sanctions screening and payments in 120 currencies are native, not add-ons.
The honest read is that Tipalti is built for companies with international complexity. A domestic-only small business paying ten local vendors will find simpler and cheaper options here. But the moment you pay contractors or suppliers across borders, or run multiple entities, the unlimited-user model and compliance depth justify the platform fee. Mass Payments plans for large payee networks start higher.
What we like- Unlimited users on every plan, so approval access never drives the bill
- Global payments to 200-plus countries in 120 currencies with tax compliance built in
Watch out for- Transaction fees per invoice and payment add up at volume
- The platform is built for scale, which can be more than a domestic small business needs
#4
Ramp
Best for: Teams that want corporate cards, expenses and AP automation for free
Visit ramp.com
Starting priceFree ($0/user/month); Plus $15/user/month plus platform fee
Free planYes
Ramp is the free lunch that is actually free. The $0 plan includes unlimited physical and virtual corporate cards, expense management with receipt matching, bill pay with standard ACH, and accounting sync with QuickBooks Online and Xero. Invoice capture uses OCR, approvals are configurable, and there is no trial expiry because it is not a trial. Ramp makes money on card interchange, which is why the core product costs you nothing.
The limits are real but reasonable. Custom approval workflows, procurement tools, multi-entity support and the deeper ERP integrations require Plus at $15 per user per month plus a platform fee. And the free plan works best when your card spend flows through Ramp. For a small business that wants invoice approvals handled without a software bill, start here and upgrade only when the workflows demand it.
What we like- The free plan genuinely includes unlimited cards, expense management and AP bill pay with ACH
- 1.5% cashback on card spend
- Clean modern interface
Watch out for- Advanced approval workflows, multi-entity support and NetSuite/Sage Intacct integrations sit on the paid Plus tier
- The business model rewards card spend
#5
Airbase
Best for: Mid-market companies wanting procure-to-pay control in one system
Visit airbase.com
Starting priceSee website (custom quote; no public pricing)
Free planNo
Airbase, now an Airbase by Paylocity company marketed as Paylocity for Finance, is the control freak's choice. The philosophy is pre-approval: purchase requests and virtual cards stop unauthorized spend before the invoice ever arrives, instead of catching it in review. Guided procurement walks occasional buyers through compliant purchasing, and the approval engine handles multi-entity, multi-subsidiary structures that break simpler tools.
The buying process is enterprise-shaped: custom quotes, demos, and implementation measured in weeks. Third-party estimates put typical deals in the tens of thousands per year. Small teams will find it more than they need. For a 100 to 1,000-person company that wants one system from purchase request to reconciliation, it is one of the strongest options here.
What we like- True procure-to-pay scope: purchase requests, approvals, AP, expenses and corporate cards with pre-spend controls
- Strong multi-entity support for complex company structures
Watch out for- No public pricing and a sales-led buying process
- Implementation takes longer than lighter tools
- Now part of Paylocity, so expect the brand to keep evolving
#6
AvidXchange
Best for: Mid-market AP teams that want a large supplier payment network
Visit avidxchange.com
Starting priceSee website (custom quote; no public pricing)
Free planNo
AvidXchange automates the invoice-to-pay cycle for mid-market companies, with its AvidPay network as the centerpiece. When your vendors are already in the network, payments go electronic instead of by check with no vendor onboarding work on your side. The platform covers invoice capture, approval routing, and payments, with integrations across 200-plus accounting systems.
The honest caveats come from reviewers: support responsiveness and implementation complexity get flagged more often than with the simpler tools here. Pricing is quote-based and third-party estimates put it well above small-business budgets. AvidXchange fits established mid-market finance teams processing real invoice volume through a defined ERP. Smaller businesses should look at BILL, Ramp or Melio first.
What we like- One of the largest supplier networks in AP automation, which simplifies electronic payments to vendors
- 200-plus accounting system integrations
- AI-assisted invoice capture
Watch out for- No public pricing and no self-serve trial
- Reviewers report support and implementation friction
- Pricing scales with volume and starts above small-business tiers
#7
MineralTree
Best for: Mid-market finance teams automating invoice-to-pay end to end
Visit mineraltree.com
Starting priceSee website (custom quote; vendor lists from $5,000/year usage-based)
Free planNo
MineralTree, a Global Payments company, covers the full invoice-to-pay flow for mid-market finance teams. Invoice capture feeds approval workflows with two-way matching, then payments go out by virtual card, ACH or check from the same system. Virtual card rebates can offset the platform cost for companies with real payment volume. ERP integrations are deep, particularly with Sage Intacct and NetSuite.
Pricing is usage-based and quote-driven, with vendor listings starting around $5,000 per year. The product family has grown through acquisition, so buyers should confirm which product (TotalAP for mid-market, Inspyrus for enterprise shared services, or the embedded Sage option) fits their setup. For a mid-size company standardizing AP on one platform, it is a solid contender.
What we like- End-to-end invoice-to-pay in one application: capture, approval routing and payments together
- Deep ERP integrations including NetSuite, Sage Intacct and QuickBooks
Watch out for- Quote-based pricing aimed at mid-market budgets
- The product lineup (TotalAP, Sage Vendor Payments, Inspyrus) takes work to navigate
#8
Plooto
Best for: Small businesses and accounting firms wanting approvals plus international payments
Visit plooto.com
Starting priceC$32/month (Grow); Go C$9/month for firms; Pro by quote
Free planNo (30-day free trial, no credit card required)
Plooto is the cross-border value pick. The Grow plan at C$32 per month includes custom approval workflows with unlimited approvers, OCR invoice capture, and international payments with transparent exchange rates. Accounting firms get their own tiers starting at C$9 per month, which is why bookkeepers recommend it to clients. The 30-day free trial requires no credit card.
The quirks are worth knowing. Prices are listed in Canadian dollars, so US buyers should convert before comparing. Domestic transactions beyond the included allowance cost per transaction on some plans. But for a small business that pays vendors in more than one currency and wants real approval controls without per-user fees, Plooto undercuts most of this list.
What we like- Custom approval workflows with unlimited approvers on Grow
- Domestic and international payments with competitive FX
- Two-way sync with QuickBooks, Xero and NetSuite
Watch out for- Pricing is in Canadian dollars, which confuses US buyers
- Domestic transactions cost extra beyond the included bundle on lower plans
#9
Melio
Best for: Small businesses that want simple, affordable bill pay with approvals
Visit melio.com
Starting priceFree (Go plan); Core $25/month; Boost $55/month; Unlimited $80/month; Platinum custom
Free planYes (Go: 1 user, 5 free ACH payments per month)
Melio is the small-business bill pay specialist. The free Go plan handles the essentials: bill capture, a dedicated bills inbox, approval workflows, and five free ACH payments per month. Core at $25 per month raises the ACH allowance to 20 and adds QuickBooks Online and Xero sync, batch payments, W-9 collection and 1099 automation. Boost and Unlimited scale the payment allowances further for busier AP operations.
The tradeoff is the ceiling. One user on the free plan means a second approver needs a paid tier, and businesses outgrow five ACH payments quickly. But as an on-ramp to real invoice approval discipline, Melio is the gentlest in this list: free to start, $25 to get serious, and no per-user math to do. For freelancers and tiny teams, it is the easiest yes.
What we like- A genuinely free plan with AI bill capture, approvals and international payments
- Paid tiers scale by payment volume, not headcount
- QuickBooks and Xero sync on Core and above
Watch out for- The free plan covers one user and five ACH payments monthly, so growing teams upgrade fast
- Advanced user roles and NetSuite sync sit on higher tiers
Three pricing models dominate this category, and the cheapest one depends on your shape. Per-user pricing (BILL at $49/user/month) is simple but punishes broad approval access: twenty approvers cost nearly $1,000 per month before transaction fees. Unlimited-user platform pricing (Tipalti from $99/month) flips the math: approvers are free, and you pay per invoice and payment instead. Companies with many approvers and moderate volume usually pay less this way.
Usage-based pricing (MineralTree from about $5,000/year, Plooto's per-transaction domestic fees) ties cost to volume, which suits seasonal businesses. And the free tier (Ramp at $0, Melio Go at $0) removes the subscription entirely, with the vendor earning on card interchange or payment volume instead.
Before comparing headline prices, count two numbers: how many people will approve invoices, and how many invoices you process monthly. A 30-person company processing 200 invoices a month gets very different quotes from BILL, Tipalti and Ramp. Model both, then decide.
Frequently asked questions
What is invoice approval software?
Software that captures vendor invoices, routes them to the right approvers, matches them against purchase orders, and pays them, keeping an audit trail of every step. It replaces the email-and-inbox-chaos version of accounts payable with a defined workflow: capture, code, approve, pay, reconcile.
How much does invoice approval software cost?
From $0 to custom enterprise quotes. Ramp and Melio Go are free. BILL starts at $49/user/month, Tipalti at $99/month with unlimited users plus transaction fees, Plooto at C$32/month, and Melio Core at $25/month. Stampli, Airbase, AvidXchange and MineralTree are quote-based, typically aimed at mid-market budgets and up.
What is the difference between AP automation and invoice approval?
Invoice approval is one stage of AP automation: the routing and sign-off workflow. Full AP automation adds invoice capture (OCR), coding, PO matching, payment execution and reconciliation. Every tool on this list does both to some degree; the enterprise names (Stampli, Airbase, AvidXchange, MineralTree) go deepest on the full cycle.
Which invoice approval software is best for a small business?
Start free: Ramp if you also want corporate cards and expenses, Melio if you want pure bill pay. Step up to BILL ($49/user/month) when you need AP, AR and expenses unified, or Plooto (C$32/month) when you pay vendors internationally. The quote-based enterprise tools are overkill under about 50 employees.
Do these tools integrate with QuickBooks, Xero and NetSuite?
Yes, across the board, with differences in depth. BILL, Tipalti, Plooto and Melio all sync with QuickBooks Online and Xero. NetSuite and Sage Intacct integrations are standard on the mid-market tools (Stampli, Airbase, AvidXchange, MineralTree) and on higher tiers elsewhere (Ramp Plus, Plooto Pro). Confirm two-way sync, not just export, before you buy.
How we chose
We started with the searches buyers run: best invoice approval software, invoice approval workflow software, and AP automation software. For each candidate we opened the vendor's official website and pricing page, checked plan details against public reviews on G2, Capterra and Software Advice and practitioner discussion on Reddit, and compared approval workflow depth, OCR capture quality, PO matching, payment options, integration coverage and company-size fit. Where the vendor publishes no price we wrote "See website" instead of guessing. No vendor paid for placement.
Approval workflow features that actually matter
OCR capture quality decides whether the software saves time or creates cleanup work. The tools here all extract invoice data automatically, but accuracy varies by invoice format; during a trial, run your messiest real invoices through, not the clean samples.
PO matching is the next filter. Two-way matching (invoice vs. purchase order) catches price and quantity errors. Three-way matching (adding goods receipt) catches the rest. If you issue purchase orders, buy a tool that does this natively: Stampli, Tipalti, Airbase and MineralTree all do.
Then check the approval routing itself. Can approvals branch by amount, department or vendor? Can approvers comment and ask questions on the invoice? Is there a full audit trail for compliance? Mobile approvals matter more than vendors admit, because approvers do this work between meetings. Finally, confirm the ERP sync is two-way: approved invoices should post to the books automatically, not sit in an export queue.
Sources we checked (11)
- https://www.stampli.com/
- https://www.bill.com
- https://tipalti.com/
- https://ramp.com
- https://airbase.com/
- https://www.avidxchange.com
- https://mineraltree.com/
- https://www.plooto.com/
- https://melio.com
- https://www.g2.com/categories/ap-automation
- https://www.capterra.com/accounts-payable-software/
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.