All three let a chat turn "quote this" into a numbered document and, later, "they said yes" into an
invoice. SendQuoteNow (com.sendquotenow/quote-engine
on the official registry) is a hosted quote-and-invoice generator for contractors, reached over one
remote MCP endpoint behind an API key, with PDF, a client approval page, a QR code and a Stripe payment
link built in. estimate-invoice
(net.sodatsu-mitsumori/estimate-invoice, marketed in Japan under a name that translates as
"a quote that grows") is a Japanese billing platform's remote MCP feature, reached over OAuth from an
existing paid account, covering estimates, invoices, delivery notes and purchase orders together. Ours
reads and writes plain JSON on your own machine, needs no account of any kind, and its whole reason to
exist is one design decision: an accepted quote is invoiced from its own stored lines, never recomputed
against whatever the shared tax settings say today.
| Fact | Ours | SendQuoteNow | estimate-invoice |
|---|---|---|---|
| Tools | 11 (quote_create through license_activate) | One hosted endpoint behind an API key: instant PDF quote generation, quote-to-invoice conversion, client approval links, quote history | Remote MCP behind OAuth: create, edit, duplicate and convert estimates, invoices, delivery notes and purchase orders, plus PDF and shareable-URL generation |
| Account or key needed | No. No account, no key | Yes, a free SendQuoteNow account and an sqn_live_ API key, or x402 USDC micropayments with no account | Yes, an existing estimate-invoice account on a paid plan; the free plan cannot use the MCP connection at all |
| Where the data lives | Local JSON in ~/.local/share/mcp-servers/quotes/ | SendQuoteNow's own cloud account | estimate-invoice's own cloud platform, optionally synced to freee accounting |
| Quote to invoice | quote_accept copies the quote's own stored lines, so a VAT-rate change made after the quote was sent cannot move the total the client agreed to | Described as "quote-to-invoice conversion"; no published detail on whether prices are copied or recomputed | Documents are duplicated and converted between estimate and invoice inside the platform; pricing-at-conversion behaviour is not documented |
| Free tier | 5 open quotes at a time; quote_send_text, revising, accepting and declining are unrestricted | $0/month, 5 documents a month across quotes, invoices and purchase orders combined, no card required | None for the MCP feature; it is gated to a paid plan and above |
| Pricing model | $19 once, lifetime, or $39 for every server in the collection | $4.99/month for unlimited documents, or pay-per-call from $0.01 to $0.10 via x402 USDC on Base with no subscription | Bundled into estimate-invoice's own subscription tiers; no price is stated on the MCP feature page itself |
| Licence | MIT | Proprietary, no public repository | Proprietary, no public repository |
| Works with no network | Yes | No, every tool is a hosted API call | No, every tool is a hosted call behind OAuth |
Pick it when the quote needs to end in a client clicking something: its own approval page, a QR code printed on a paper estimate, and a Stripe payment link attached to the same document, none of which a local JSON file can offer on its own. It also already speaks multi-currency across USD, CAD, EUR, GBP and AUD from one account, and the pay-per-call x402 route means an agent can quote without a subscription at all, at $0.10 a generation. The cost is the same one every hosted tool carries here: the quote lives in SendQuoteNow's account, not yours, and the free tier's 5-document monthly cap is shared across quotes, invoices and purchase orders together, not 5 quotes on top of separate invoice room.
Pick it if the business already runs on estimate-invoice for estimates, invoices, delivery notes and purchase orders, and the freee accounting sync matters: the MCP connection lets an AI agent read and write into a system of record that is already the business's real bookkeeping, not a second ledger next to it. It also states plainly that it does not spend the platform's own AI credit for MCP calls, since the model doing the work is the connected agent's, not theirs. The requirement that comes with that is a paid account before the connection can be enabled at all; there is no free way to try the MCP feature itself.
Pick ours when the answer to "where does this data live" should be "nowhere but here." There is no
account to create for either product in this comparison, no monthly document cap shared with an invoice
server, and no subscription: $19 once opens quote_pdf and quote_report for good. The one thing neither
competitor's public material documents is what a recompute-at-acceptance would do to a quote once the
issuing business's own tax settings change before the client answers; ours measured that case directly and
built quote_accept to copy the quote's stored lines specifically because recomputing moved a
EUR 1,230.00 agreed total to EUR 1,080.00 in the test that provoked the decision.
The quotes package carries adversarial, corruption and concurrency test suites covering 25 probes, all passing, plus the specific VAT-rate-change case: a quote issued at a profile's 23% default rate, the default then changed to 8% before the client answers, and the accepted invoice still carrying the original 23% and the original EUR 1,230.00 total. Two processes creating 40 quotes against one data directory left 40 quotes and 40 unique ids. Neither SendQuoteNow's nor estimate-invoice's public material states a test count or an acceptance-time pricing rule to compare against.
Ours, Claude Code:
claude mcp add quotes -- npx -y @theluckystrike/mcp-quotesSendQuoteNow (remote, once an API key is minted from its dashboard):
claude mcp add-json sendquotenow '{"type":"http","url":"https://sendquotenow.com/mcp","headers":{"X-API-Key":"sqn_live_..."}}'estimate-invoice is enabled from inside its own product, under its "external AI connection" settings page, by pasting a setup string it generates there; it is not added by hand as a config block.
Exact config file paths per client are on the setup pages, and the longer walkthrough is in quotes and estimates to invoice.
Yes. Tool names do not collide: ours are quote_create, quote_accept and so on; SendQuoteNow exposes its own hosted endpoint under its own names. Nothing is shared between them, and they store their documents in different places entirely.
Neither publishes that detail. Ours measured the difference directly: recomputing at acceptance moved a EUR 1,230.00 agreed total to EUR 1,080.00 after a VAT-rate change made between quoting and acceptance, which is why quote_accept copies the quote's own stored lines instead.
Ours, unrestricted for 5 open quotes at a time with no account. SendQuoteNow has a free tier too, capped at 5 documents a month shared across quotes, invoices and purchase orders. estimate-invoice's MCP connection is not available on its free plan at all; it requires an existing paid subscription.
Ours is $19 once, lifetime, or $39 for the whole collection. SendQuoteNow is $4.99/month for unlimited documents, or per-call x402 payments with no subscription. estimate-invoice bundles the MCP feature into its own paid tiers at a price its feature page does not state.
SendQuoteNow's tools, pricing and account model come from its website at sendquotenow.com and its official registry entry for com.sendquotenow/quote-engine. estimate-invoice's tools, OAuth requirement and plan gating come from its feature page at sodatsu-mitsumori.net/features/external-ai-mcp/ and its registry entry for net.sodatsu-mitsumori/estimate-invoice. All read on 2026-09-04.