Finance AI Index
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Invoicing software · September 2026 Edition

Wave vs BILL

Zero of twelve models named Wave first on the direct prompt; two named BILL. Both were named by all twelve models and Wave carries 35 labels and BILL 26, so the shares are not directly comparable.

Wave

accepted challenger

Named in fourteen categories this edition.

BILL

accepted challenger

Named in twelve categories this edition.

First-choice share19%14%Of first choices across the direct, paraphrase, budget and scale prompts, 0 to 100.
Negative rate23%4%Negative labels as a share of the product's labels, 0 to 100.
Rank in category#1#3A position in a field of 10; printed, not drawn.
Labels3526A count; the two differ.
The two percentage rows are drawn on one 0 to 100 track, Wave reading right to left. Rank and label count are printed, not drawn.Wave vs Zoho Invoice · Zoho Invoice vs BILL

Share is the count of first choices across the direct, paraphrase, budget and scale prompts over all twelve models, for a mid-market B2B company; rank is within the category; every quote names the model and the prompt it came from. Both figures come from the invoicing software page.

By framing

How many of the twelve models made each the first choice, per way of asking, and how many argued against it.
WaveFirst choices, of twelve modelsBILL
Direct021 against Wave
Paraphrase033 against Wave
Comparative00
Budget-constrained80
Scale-constrained01
Negative104 against Wave · 1 against BILL
Bars are first choices, 0 to 12 each sideModels that argued againstA model can name both, so the two sides of a row do not sum to twelve.

The direct prompt

The plain question, one answer per model, grouped by where Wave and BILL stood in it.

BILL first, Wave not the choice

2 of 12 modelsWave was named in the answer but not as the choice, or not at all.
Grok 4.1 FastBILL alternatives: Chargebee, NetSuite, QuickBooks, Xero
MiniMax M2.5BILL alternatives: Stampli, Tipalti

Neither was the first choice, one was named

8 of 12 modelsThe answer put something else first and named one of the two as an alternative.
Claude Haiku 4.5Sage Intacct alternatives: BILL, DealHub AI, Younium
GPT-5.4 miniNetSuite SuiteBilling alternatives: BILL, Sage Intacct
Gemini 3.5 FlashVersapay alternatives: BILL, Billtrust, Chargebee, Invoiced, Lago, Orb, Quadient AR
Perplexity SonarInvoiced alternatives: BILL, NetSuite, QuickBooks
Mistral SmallInvoiced, SAP alternatives: AvidXchange, BILL, Tipalti
DeepSeek V4 FlashBilltrust, Invoiced alternatives: BILL, Chargebee, HighRadius, Quadient AR, Sage Intacct, Tipalti, Versapay
Qwen 3.7 FlashBillforward alternatives: BILL, ChargeOver, NetSuite SuiteBilling, Vendormedia
Kimi K2HighRadius alternatives: BILL, Billtrust, Invoiced, Versapay

Neither was named

2 of 12 modelsThe answer made no first choice from these two in this category.
Llama 4 Maverickno first choice
GLM 4.7 FlashXInvoiced alternatives: Chargebee, QuickBooks, Zoho Invoice

Bold names in an answer are the products the judge labeled a first choice; a model naming several gives each of them that label. The full answer text for every row is in the record.

By buyer segment

The same question asked on behalf of a different buyer. Each standing is computed within its segment and they are never added together. The figures above are the mid-market standing, which is the one the category orders by.
Small business
Wave leads by fourteen points.
Wave14%#4 of 8
BILL0%#– of 8
The full small business standing →
Mid-marketThe figures above
Wave leads by five points.
Wave19%#1 of 10
BILL14%#3 of 10
The full mid-market standing →
Enterprise
The order flips: BILL leads at enterprise.
BILL5%#8 of 13
Wave0%#– of 13
The full enterprise standing →

What the models said about Wave

Every negative label with a quote, up to three, then the highest-weighted positives, up to three. Three of three in this category shown.

“Invoicemonk says to avoid US/Canada-only tools like Wave if you need multi-currency/global compliance” Perplexity Sonar · negative prompt · hard negative
“Avoid free tools like Wave—they lack automation depth growing businesses need” Kimi K2 · paraphrase prompt · hard negative
“Wave offers a permanently free version with no monthly subscription, and its invoicing features are intuitive to navigate” Claude Haiku 4.5 · budget prompt · first choice

What the models said about BILL

No label in this category carried a quote.

Also compared
Wave vs Zoho InvoiceZoho Invoice vs BILLThe full invoicing software standing

Comparisons are drawn for the top three products in each category. The output is the models' output; nothing here is a recommendation by the index.