Which outsourced bookkeeping works with Harvest, BigTime, Kantata and Scoro?

The short answer

Consulting and professional services firms track time and projects in a PSA or time tool, then need a general ledger that actually matches invoices, payments, payroll, and cash. Harvest, BigTime, Kantata, and Scoro each connect to accounting differently, and the differences are real: one-way versus two-way sync, which QuickBooks version is supported, and which objects (invoices, bills, payments, classes) move automatically versus manually. Outsourced bookkeeping works when the firm keeps one system of record for delivery and billing and the bookkeeper reconciles what actually hits the bank, not when someone re-keys every timesheet into QuickBooks by hand.

Quick reference

Harvest

Harvest is built for time tracking and turning billable time and expenses into invoices. Its own help center confirms two specific limits exactly: "this integration isn't available for Harvest accounts on our free plan," and "the Harvest integration doesn't work with the Self-Employed or Desktop versions of QuickBooks Online" (Harvest). The integration copies invoices, and optionally payments, from Harvest into QuickBooks Online. It doesn't sync raw time and expense entries as standalone QuickBooks transactions, only as line items on those invoices.

One nuance worth knowing: payment copy is one-way only, from Harvest to QuickBooks, by default. Harvest's own documentation notes a beta "Payments sync" option exists for a limited set of users, which would make payments flow both directions instead, but this isn't broadly available.

Bookkeeping implication: revenue in the GL lags whatever the team actually worked until invoices are sent and copied over. Unbilled WIP lives in Harvest's own reports, not automatically in QuickBooks. Outsourced bookkeepers should pull uninvoiced time reports at month-end if management cares about earned-versus-billed revenue, not just what's been invoiced.

BigTime

BigTime positions itself as PSA tightly coupled to QuickBooks, and its own site confirms this is a genuinely two-way relationship, not just a deeper one-way push: BigTime describes itself as "an official Intuit-Integrated Application" with "Deep Accounting Integration" where "time, expenses, tax codes, and GL mappings all sync automatically, both directions, in real time" (BigTime). It connects to both QuickBooks Online and QuickBooks Desktop, with Desktop requiring a locally installed Sync Agent and Online syncing directly through Intuit's cloud. Firms can post approved time and expenses and control whether items post as billed when invoicing from BigTime itself.

Bookkeeping implication: this is a closer operational sync than Harvest's, but that closeness cuts both ways. Wrong item, account, or class maps create systematic miscoding that then flows in both directions instead of staying contained to one. The bookkeeper's job is to verify that project income, reimbursable expenses, and payroll burden still produce a clean P&L and balance sheet, not to assume that "synced" automatically means "closed and correct."

Kantata

Kantata isn't simply a renamed version of one older product, worth getting right since it changes what a firm might actually be running today. Kantata was formed in December 2021 from the merger of two separate, independently built PSA competitors: Mavenlink, founded in California in 2008, and Kimble Applications, founded in the UK in 2010, with the combined company rebranded Kantata in 2022 (Orange County Business Journal). The two original products still exist as two distinct editions rather than having been merged into one codebase: Mavenlink became Kantata OX, an open-architecture product with broad integration options, and Kimble became Kantata SX, built natively on Salesforce (Kantata). Which edition a firm runs can matter for accounting integration specifics, since OX and SX come from genuinely different technical lineages.

Documented QuickBooks capabilities include sending tracked time and project expenses, linking tasks and roles to billable items, invoicing customers in QuickBooks from Kantata data, and payment status flowing back when an invoice is paid or voided in QuickBooks. The correct tier and QuickBooks plan both apply here, and larger firms often connect Kantata to NetSuite or Sage Intacct instead of QuickBooks entirely.

Bookkeeping implication: scope the integration to the firm's actual billing model, time-and-materials versus fixed fee. Fixed-fee and milestone deals need a written revenue recognition policy so the PSA's percent-complete tracking doesn't quietly diverge from what the GL actually recognizes as earned.

Scoro

Scoro combines projects, resources, and billing, and its own help center is specific about the sync mechanics: Scoro integrates with QuickBooks Online only, not Desktop, and while invoices, bills, and payments can each sync in either direction, each object moves "only one way at a time" per configuration, not simultaneously both ways (Scoro). One exception worth flagging specifically: QuickBooks Classes sync only from QuickBooks into Scoro, never the reverse. Invoices and bills can be sent to QuickBooks until a payment gets attached to them.

Bookkeeping implication: treat Scoro as the operational billing engine and QuickBooks as the actual books. When sync errors appear, a missing income account on an item, a closed period, duplicate links between the two systems, fix the underlying master data first before forcing another sync attempt; forcing it again without fixing the root cause usually just compounds the mismatch.

What users say

BigTime and Scoro both run strong on G2, 4.5 out of 5, BigTime across a large and fast-growing base of roughly 1,600 to 1,750 reviews, Scoro across a smaller but still solid base of around 500. Harvest sits a bit lower at 4.3 out of 5 across roughly 830 reviews, and Kantata lower still at 4.2 out of 5 across a substantial base of around 1,500 reviews, reviewed under its full G2 listing name, which itself carries the "formerly Mavenlink+Kimble" framing. None of the four draws much accounting-specific commentary; reviewers weigh in mainly on time tracking, project management, and ease of use, which lines up with what each platform is actually built to do first.

One genuinely useful, sourced pattern worth knowing before picking a firm's reporting expectations: G2's own comparison summary notes that Scoro's interface and reporting are considered "superior" relative to Kantata's, while Kantata is "more commonly favored by mid-market companies," meaning the two aren't really competing for the same buyer in the first place, Scoro skews smaller and more self-serve, Kantata skews larger and more complex.

Shared failure mode

A 12-person consultancy records the following for one month:

If bookkeeping only records the $64,200 of deposits as "consulting income," the P&L understates sales, ignores AR movement entirely, and can't explain utilization or backlog to anyone who asks. Correct close uses PSA invoice and AR reports plus the bank: income and AR come from the invoices, cash comes from the payments, and $24,500 in unbilled WIP gets reported clearly to management, even when WIP itself isn't booked onto the balance sheet under a pure cash or bill-when-invoiced policy.

What "works with" outsourced bookkeeping actually means

A fit bookkeeping partner for these stacks will:

1. Leave time entry exactly where it already lives, in Harvest, BigTime, Kantata, or Scoro.

2. Use each platform's own invoice and payment reports, or its sync, as the actual revenue source.

3. Reconcile the bank and processors against those invoices, not against a general assumption.

4. Own payroll, AP, owner draws, and the month-end close inside the GL.

5. Report unbilled WIP and AR aging clearly, so delivery and finance are working from one shared story instead of two.

A poor fit either re-enters hours into QuickBooks by hand, or ignores the PSA entirely and tries to "clean up" from the bank feed alone, missing everything that distinction above was built to catch.

How Numetix works with these tools

We work inside the accounting system you already use and alongside Harvest, BigTime, Kantata, or Scoro, whichever one your team actually runs. AI helps match bank activity to invoices and payers; a CPA-overseen team owns reconciliations, AR tie-out, and the monthly close, so billable work, invoices, and cash all stay aligned.

A practical first step: send us last month's invoice register from your PSA, the AR aging, and two weeks of bank activity. We'll show you the matched totals and exactly where unbilled or unapplied cash is hiding. Book 30 minutes with our team. More on how Numetix serves professional services firms.

Frequently asked questions

Can the bookkeeper work only inside QuickBooks? They can close the books in QuickBooks, but they still need the PSA's own invoice and payment reports, or a genuinely reliable sync, every month. Bank-only bookkeeping understates the firm's real activity on every one of these platforms.

Does Harvest replace QuickBooks? No. Harvest handles time tracking and operational invoicing. QuickBooks, or Xero, remains the actual ledger for full financials.

We invoice fixed-fee projects. What changes? Time still informs utilization and delivery planning, but revenue follows the contract's own policy, milestone, percent-complete, or as-invoiced. Document that policy explicitly so the PSA and the GL don't quietly drift apart over time.

Which platform is "best" for bookkeeping specifically? The one your team actually completes timesheets in consistently. Bookkeeping quality follows complete billing data far more than it follows any particular brand name or sync claim.

Is Kantata the same thing as Mavenlink? Not exactly. Kantata formed in 2021 from a merger of Mavenlink and a separate UK competitor, Kimble Applications. The two products still exist today as distinct editions, Kantata OX (from Mavenlink) and Kantata SX (from Kimble, built natively on Salesforce), not as one combined codebase.

What should we send the bookkeeper on day one? The chart of accounts, a PSA-to-GL integration diagram or export process, the current AR aging, the payroll calendar, and access to invoice reports broken out by client and project.