Most software comparisons start in the wrong place
Searching "best agency billing software" mostly returns lists ranked by feature count — whichever tool does the most things wins the listicle. That's a reasonable way to compare software in the abstract, and a poor way to pick software for your specific agency, because the tool with the most features is often the tool with the most complexity, the steepest learning curve, and the highest price — none of which matter if half those features solve problems you don't have.
A more useful starting point is naming your actual problem before looking at any tool at all.
Start with what's actually broken, not a feature checklist
If the problem is "invoices get questioned" — the client keeps asking what a line item means — the tool you need is one that ties billed work to logged time, tasks, and dates automatically. Broad project-management suites don't solve this by default; billing-focused tools built around that connection do.
If the problem is "retainers are a mess" — you can't tell if a client has used their hours, or whether the retainer is even profitable — you need native retainer tracking with usage visibility, not recurring invoices bolted onto a project-based tool.
If the problem is "we don't know which clients make money" — you need a real profitability or margin view, which is a genuinely different (and rarer) feature than time tracking or invoicing. Not every billing tool has this, including some well-known ones; if this is your core problem, confirm the tool actually computes cost-based margin, not just billed-vs-invoiced realization rate, which sounds similar but answers a different question.
If the problem is "we can't tell who's available for new work" — you need resource or capacity planning, which is a genuinely separate feature area from billing and time tracking, and tends to only exist in larger, more expensive, more complex platforms built for bigger teams.
If the problem is "the client relationship starts messy" — proposals, contracts, and onboarding are inconsistent — you need a CRM/proposal layer connected to delivery, not just a billing tool with an invoice generator bolted on.
Questions worth asking before you compare feature lists
- Does pricing scale with team size, or is it flat? Per-seat pricing that looks cheap at 3 people can double or triple by the time you're at 8 — run the math for your team size a year from now, not today.
- Does the "profitability" feature compute real margin (cost vs. revenue), or realization rate (billed vs. invoiced)? These sound similar and answer different questions — ask directly if you're not sure which one a tool actually shows.
- Is retainer billing native, or a workaround using recurring invoices? The difference shows up the first time you need to know whether a client burned through their hours mid-month.
- Can a client review and pay an invoice without creating an account? A surprising number of tools still require client-side logins for something that should be a one-click link.
- What does the tool cost at your team size in a year, not your team size today?
Nobody wins every category, and that's fine
Every tool in this space makes tradeoffs. Tools built for deep profitability and resource planning (Productive.io, Scoro) tend to be more expensive per seat and have a steeper learning curve, because that depth is genuinely expensive to build and maintain. Tools built for solo freelancers (Bonsai, HoneyBook) are lighter and cheaper but don't scale cleanly once a real team and retainer clients enter the picture. Tools built specifically around billing clarity (which is where ABH sits) do that one problem well without trying to also be a full resource-planning platform — which is a real tradeoff, not a hidden flaw, and worth being upfront about if capacity planning or deep margin analytics are what you actually need today.
The right tool is the one that solves your specific, current, named problem — not the one with the longest feature list on its pricing page.