Best consulting firm software in 2026: engagements and retainers

What consulting firm software is (and what it is not)

Consulting firm software runs the business around the advice: the proposal and statement of work, the engagement or retainer, the hours, the invoice and the client's view of progress. It is not a CRM alone, not an accounting ledger, and not a document-drafting tool for contracts. Large practices add professional services automation (PSA), which schedules people against demand and forecasts utilization. A smaller firm often needs less: a repeatable way to win the work, bill a deposit, track hours and invoice every month without chasing. This guide focuses on engagements, proposals, retainers and billable time. For the day-to-day workflow rather than the ranked list, see the consulting business software guide.

How we compared these tools

We compared each tool on the same five points, using only the vendor's own pricing and product pages:

1. Proposals and scope: whether the page names proposals, quotes or contracts, and how they connect to the engagement.
2. Retainers and recurring billing: retainer, recurring or scheduled invoicing named on the plan.
3. Billable time and utilization: time tracking, billable hours and any utilization or capacity reporting.
4. Price and seat rules: the published price, per-seat or flat, and the minimum seats.
5. Trial terms, including whether a card is stated.

We did not test speed, support, reliability, accounting accuracy or migration effort, and we did not use third-party ratings. Order reflects documented fit for a consulting firm of 1 to 20 people selling projects and retainers.

The best consulting firm software in 2026

1. Workspace369, best for small firms that sell projects and retainers

Workspace369 puts the whole front-to-back loop on the entry plan. Cadet costs $29 a month ($23.25 billed yearly) for one seat and includes proposals that clients approve and sign by public link, deposits on acceptance, a client portal, time tracking with time-to-invoice, intake forms, recurring invoices and retainers, and online card payments through Stripe. A pre-made payment follow-up automation sends email reminders 1, 3, 7, 14 and 30 days after the due date. Portal visitors do not use a team seat. The screenshot above is a demo project board, not a customer result. Voyager ($74, 2 seats) adds the shared inbox, SMS and calls and removes the project cap; Specialist ($149, 10 seats) adds payment plans, expenses, AR aging and project and customer profitability.

Limitations: it does not list resource planning, capacity scheduling or utilization forecasting. Cadet is one seat and up to 5 active projects, credit notes are listed as coming soon, and the 14-day trial needs a card.

Best for: independent consultants and firms of up to about 20 people who want proposals, deposits, retainers, hours and invoices in one place without a PSA rollout.

2. Bonsai, best for independent consultants who want proposals, contracts and invoices per user

Bonsai's pricing page lists four per-user plans: Basic at $15 a month ($9 billed yearly), Essentials at $25 ($19), Premium at $39 ($29) and Elite at $59 ($49). Time tracking is on every plan, and proposals, contracts, invoices and payments start at Essentials. Profit and productivity reports appear from Premium, and Elite requires at least 3 users. The page lists unlimited clients and projects on Basic and a 7-day trial; card terms at signup are not stated. On the one-engagement test, check the proposal-to-invoice cycle for a solo consultant; per-user pricing grows as you add people.

Limitations: utilization reports start on Premium and staffing on Elite (capacity tracking from Essentials), and retainer invoices start on Essentials. The trial is 7 days.

Best for: solo consultants and very small teams who want contracts, proposals and invoices at a low per-user price.

3. Productive, best for firms that plan capacity and track budgets

Productive's pricing page lists Essential at $10 per user a month billed yearly ($12 monthly) and Professional at $25 ($29 monthly), with a 3-seat minimum, plus an Ultimate plan priced by conversation (checked October 19, 2026). Essential lists budgeting, time tracking and resource planning; Professional lists recurring budgets; the feature list also names utilization reports, retainer management and retainer invoicing, with invoices and credit notes on every plan. The page states a free 14-day trial with no credit card required.

Limitations: proposals appear only as a PDF export for deals, and proposals signed by link, contracts and a shared inbox are not named.

Best for: consulting practices that schedule people across engagements and want budget-versus-actual and utilization in one tool.

4. Scoro, best for firms that want quotes, projects and finance under one roof

Scoro lists four per-user plans: Time-billing from 15 euros a month, Projects & Resources and Quote to Cash from 25 euros, and End-to-end from 52 euros, with a 13 to 17 percent discount for annual billing. The minimum is 5 users, and the trial is 14 days with no credit card required. Time-billing covers timesheets, scheduled and recurring invoices and credit notes. Projects & Resources adds retainer management and a utilization report, Quote to Cash adds a quote and budget builder, and End-to-end adds deals, pipeline, expenses, purchase orders and revenue forecasting.

Limitations: the 5-user minimum makes it costly for a firm of one to four, and the plans split quotes, resources and invoicing into separate tiers, so the full set sits on the highest.

Best for: firms of five or more that want quoting, resource planning and finance in one system.

5. Accelo, best for retainers and fixed-fee work run side by side with capacity planning

Accelo's pricing page does not show plans or prices. It says pricing is based on team size and growth goals and directs you to a custom quote or demo. Its site says you can run fixed-fee projects and ongoing retainers side by side, and mentions AI-guided resource capacity planning, project financials and integrations with Xero, Sage Intacct and QuickBooks Online. A trial is not stated.

Limitations: no published price or trial, and quote-based buying takes longer than starting a trial. Proposals and quotes are not described on the pricing page.

Best for: established service firms with an operations lead who want PSA-style retainer, capacity and financial reporting. If the custom quote is the blocker, see our Accelo alternative for a small agency comparison.

6. HoneyBook, best for solo and boutique consultants who sell on proposals and contracts

HoneyBook lists Starter at $29 a month billed yearly, Essentials at $49 and Premium at $109, with unlimited clients and projects. Every plan includes proposals, contracts with e-signature, invoices, payments and a client portal. Essentials adds unlimited Scheduler sessions (Starter allows 1), automations and a QuickBooks Online integration for up to 2 team members, and Premium lists unlimited team members and advanced reports. The FAQ states a 30-day trial with no credit card required.

Limitations: time tracking and retainers are not stated on the pricing page, so billable-hours consulting needs a closer look. There is no utilization reporting listed.

Best for: independent consultants and boutique advisers who sell packaged work and care most about polished proposals and payment collection. For a solo practice, compare the software independent consultants use for proposals and invoicing.

Side-by-side comparison

Which consulting firm software fits your firm?

Run a one-engagement test during the trial

Feature lists look alike. Take one real client through each tool you shortlist:

1. Send a proposal with a fixed fee and a monthly retainer line.
2. Collect the deposit on acceptance.
3. Log a week of billable and non-billable hours.
4. Issue the first retainer invoice and an overdue reminder.
5. Open what the client sees and check that the invoice and its status match.
6. Count how many times you retyped a fee or an hour figure.

If you run the test, expect PSA tools to show hours against a budget and capacity directly, and Workspace369 to show hours, the retainer schedule and the invoice instead. That gap is the buying signal. The free billable utilization calculator shows what share of your week is billed, and the retainer pricing calculator checks whether a monthly retainer covers the hours you plan to give.

When to choose a different tool

If you schedule people across engagements weeks ahead, forecast utilization or need purchase orders and revenue recognition, choose Productive, Scoro or Accelo before Workspace369. If you are one consultant who wants the cheapest per-user plan, Bonsai may cost less, and HoneyBook suits packaged advisory work. If the leaks are slow proposals, late deposits and unbilled retainer months, start with Workspace369 and revisit PSA tools when the team outgrows it.

Whichever tool you trial, finish the test with one client before you import the rest, and confirm you can export your records if you leave. Compare current Workspace369 plans on the pricing page.