Stacks
AI-powered financial close and reconciliation platform
About Stacks
Stacks is a practice management platform for accounting firms in the 5-to-25-person range. Day-to-day, it tracks recurring engagement deadlines, assigns tasks based on who has capacity rather than who shouts loudest, and connects time entries directly to invoices so billable hours don't disappear between completion and billing. It replaces the combination of spreadsheets, sticky notes, and email threads that most small firms use to manage client work across tax season and monthly bookkeeping cycles. The capacity-based workload distribution is the sharpest feature here. Unlike Karbon, which centers on client communication, or Practice Ignition, which focuses on proposal and payment workflows, Stacks prioritizes internal resource visibility. A manager can see who is overloaded, who has room, and where deadlines are stacking up — without running a separate spreadsheet. The hard limit: Stacks manages the operations around accounting work, not the accounting work itself. It won't replace your tax software, your bookkeeping tools, or your reporting stack. Integrations with QuickBooks and Xero exist, but they pull data for context — they don't create a unified workflow. Newer platform means a smaller user community and thinner third-party integration options than Karbon or Practice Engine offer today.
Best for
Accounting teams needing automated financial close with real-time data access
Key Features
- Recurring engagement deadline tracking
- Capacity-based work distribution
- Integrated time tracking and billing
- Client engagement workflow management
Pros & Cons
Pros
- Capacity-based task assignment surfaces who is actually available, not just who is assigned — useful during busy season crunch.
- Time tracking feeds directly into invoicing, closing the gap where completed work goes unbilled.
- Recurring engagement tracking handles deadline management for monthly bookkeeping, quarterly reviews, and annual filings without manual reentry.
- Lighter setup and shorter onboarding than Karbon or Practice Engine — firms with no prior practice management software can get operational within days.
- Workload visibility across the team gives managers a real-time read on engagement profitability and staff utilization.
- Client engagement history and recurring service schedules are centralized, reducing reliance on individual staff memory or inboxes.
Cons
- No accounting functionality whatsoever — you still need separate tools for tax prep, bookkeeping, and financial reporting.
- Integration ecosystem is thin compared to Karbon; Zapier covers gaps but adds setup work and another failure point.
- Pricing is quote-only, so you cannot benchmark cost against competitors without a sales conversation.
- Smaller user community means fewer third-party guides, templates, or peer troubleshooting resources.
- Firms already embedded in Karbon or Practice Ignition will face real migration friction with no clear data-portability guarantee.
- No stated offline functionality — teams in low-connectivity environments or with strict data-residency requirements should verify compliance before committing.
Ledger Brief Take
This is a pure practice management play that replaces the spreadsheet-and-email chaos most mid-sized firms still use to track client work and deadlines. The capacity-based workload distribution is genuinely differentiated from competitors like Karbon or Practice Ignition, which tend to focus more on client communication than internal resource management. You'll need to maintain your separate tech stack for actual accounting work, but Stacks could finally give smaller firms the operational backbone that larger practices take for granted.
Frequently Asked Questions
Common questions accountants ask about Stacks.
What does Stacks cost?
Stacks uses custom pricing with no publicly listed tiers. You need to contact them for a quote. A free trial is available. Budget conversations without a demo are not possible, which puts it at a disadvantage versus tools with transparent per-seat pricing like Jetpack Workflow.
How does Stacks integrate with QuickBooks and Xero?
Stacks connects to QuickBooks and Xero to pull client and financial context into the practice management layer. It does not push journal entries or accounting data back. Think of it as read access for operational awareness, not a two-way accounting sync.
How does Stacks compare to Karbon?
Karbon emphasizes client communication, email triage, and team collaboration on client-facing work. Stacks emphasizes internal resource management and capacity planning. If your main pain point is staff overload and missed deadlines rather than client email volume, Stacks is the more focused tool. Karbon has a larger integration ecosystem and longer track record.
What size firm is Stacks built for?
Firms with 5 to 25 team members get the most from it. Below 5, the overhead of structured practice management usually isn't worth it. Above 25, you will likely hit limits in reporting depth and integrations that more mature platforms handle better.
Where does Stacks store data, and is it SOC 2 compliant?
Stacks has not published SOC 2 compliance documentation on its public site as of this listing. Firms with strict data security or client confidentiality requirements should request a security review and data processing agreement before signing a contract.
Can Stacks handle billing and invoicing, or do I still need a separate tool?
Stacks has a built-in billing module that converts tracked time into invoices. It is not a full accounts-receivable system, so firms with complex billing arrangements or high invoice volume may still want a dedicated invoicing tool, but for straightforward time-and-billing it covers the workflow end to end.