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Glasscubes vs Karbon

Karbon alternatives: how Glasscubes compares

Glasscubes gets complete information in from clients, chases it automatically on every plan, and reads what comes back with AI. Here is where it beats Karbon for client information collection — and where Karbon is the better buy.

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Where Glasscubes is stronger

Karbon is strong practice management built around email and team workflow. If what slows your firm down is clients not sending what you asked for, the question is whether you need a new practice system or a better way to ask.

01

Automatic chasing on every plan

Automated reminders are included from Glasscubes Essential. On Karbon, automatic client reminders start on the Business plan.

02

AI on the documents clients send

AI Assist extracts and summarises figures from client documents and flags what is missing. Karbon's AI centres on email drafting and summaries, client summaries and team assignments.

03

MTD for Income Tax built in

MTD Assist lets clients send their own quarterly updates while the tax return stays with your firm.

04

Lower cost for a team

Ten users on Glasscubes Essential cost £240 a month on annual billing. Karbon Business, the first plan with automatic client reminders, is £49 per user per month — £490 a month for ten.

Head to head

  Glasscubes Karbon
What it is Client information collection, chasing and AI review Practice management built around email and workflow
Client access Click a link — no password to remember Magic-link login tied to the device
Automatic client reminders Every plan Business plan and above
AI on client documents Extracts and summarises figures, flags missing items Email drafting and summaries, client summaries
MTD for Income Tax MTD Assist Not marketed
Ten users, billed annually £240 / month (Essential) £490 / month (Business)
Shared email inbox, time and billing No Yes

Compiled from each vendor's own published material, October 2026. Third-party prices and accuracy figures are those vendors' own published figures. Confirm current terms with the vendor.

Straight about the limits

What Glasscubes cannot do

Three things worth knowing before you switch, including the cases where Karbon is the better buy.

  • We do not run your inbox

    Karbon's shared email triage and team workflow are its core, and we have no equivalent. If email chaos inside the team is the real problem, Karbon is built for it.

  • No time, budgets or invoicing

    Karbon covers time tracking, capacity planning, invoicing and payments. We do not.

  • A small team pays an account fee

    Our monthly account fee means one or two users pay more than they would on Karbon Team. From about five users the comparison turns in our favour.

Worth a look if…

  • Clients are the bottleneck, not the team

    If work stalls waiting for client information, fix that first with a tool built for it.

  • You want chasing without upgrading

    Automatic reminders on every plan, rather than from a higher tier.

  • You want to run the whole practice in one place

    Choose Karbon. It does far more than collect information, and we would rather tell you now.

See it on your own client list

Bring a real request list and we will build it with you on the call. No annual commitment.

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Compare Glasscubes

Head-to-head against the client portals UK firms weigh it against.