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ReplaceableModerateAccountancy practiceICP fit 9/9USUKAustralia

Replace Karbon

karbonhq.com

Karbon gives US and UK accounting firms a shared inbox, recurring-job workflow engine, client CRM, time tracking, and a client portal. At $89/seat (Business tier) a 22-person firm pays ~€22,000/year. The core is client database + job/workflow CRUD + email threading: the shared-inbox element is the only mildly tricky part.

Recurring job workflow engineClient CRM & contactsShared inbox / email triageTime tracking & billingClient portal & e-signatureCapacity planning

Be the first founding member for this build.

Cost to develop
Estimated build
€50,000
Per founder (≈5 cohort)
~€10,000
split across the founding cohort
You pay now, per year
€22,000
≈ €83/user · ~22 users
5-year ROI
Stay on the SaaS
€134,312
Switch to us
€22,500
€22,000
€12,500
Yr 1
€46,200
€15,000
Yr 2
€72,820
€17,500
Yr 3
€102,102
€20,000
Yr 4
€134,312
€22,500
Yr 5

Cumulatively cheaper from year 1 onward.

Ownership model

What is actually yours.

What is yours

  • Your data, fully exportable
    Download everything, anytime. No vendor holds your history hostage.
  • A perpetual, escrow-backed licence
    Your contract includes a source-code escrow clause: the code is deposited with an independent escrow agent before go-live, so your access is contractually protected even if Rollout IT ever stops trading.
  • Your own isolated instance
    Separate servers, separate database, separate backups. Not shared infrastructure.

How the model stays fair

  • Platform IP stays with Rollout IT
    That is what keeps your build cost low and improvements flowing. You are not buying the source code, and you do not need to.
  • No per-seat. Price fixed for 10 years.
    Add your whole team for free. Your fee is locked from day one, no annual hikes.
  • We build it and run it
    Security patches, uptime, scaling: all covered by the flat annual fee. No developer retainer needed on your side.

What you keep from Karbon

The features your team actually uses — scoped with you before the build — on infrastructure your team controls.

  • Recurring job workflow engine
  • Client CRM & contacts
  • Shared inbox / email triage
  • Time tracking & billing
  • Client portal & e-signature
  • Capacity planning

What we fix

The pain points that come with renting per-seat SaaS, gone on day one.

  • Per-seat pricing abolished: one flat annual fee, whole team included.
  • Annual price hikes eliminated: your fee is fixed for 10 years from day one.
  • Data no longer locked in, fully exportable anytime, no export fees.
  • Vendor dependency removed: a perpetual, escrow-backed licence protects your access.
  • Roadmap influence added: founding members shape the initial feature set.
Savings calculator

See what you'd actually save over 5 years.

Tool to replace
Karbon
€21,912/yr€2,500/yrafter year 1
Year 1 net change: +€9,412Break even: year 15-year saving: ~€111,000
Stay on SaaS
Your own system
Cumulative cost
€21,912
€12,500
Yr 1
€46,015
€15,000
Yr 2
€72,529
€17,500
Yr 3
€101,694
€20,000
Yr 4
€133,775
€22,500
Yr 5

Assumes ~10%/yr SaaS price increases. Your own system: one-off build split across ~5 founding members (~€10,000 each) + €2,500/yr flat running cost. No per-seat charges, ever.

Co-found a build
How we work together

Three steps, no surprises.

01

We scope what you use

We map the features your team actually relies on, not the whole bloated product.

02

We build & you co-fund

Senior engineers rebuild it AI-fast. Founders share the cost and shape the first release.

03

We launch & run it

We host and run it for you for a low fixed annual fee, with our support behind it.

Get involved

Pick your path.

~€10,000per founder to start (≈5-founder cohort), then ~€2,500/yr
  • A fixed annual fee, with no more growing per-user licensing
  • Influence over the first feature set
  • Revenue share (~5%) from late joiners until you recover ~half your spend
  • Zero-risk to apply, and we follow up within 48 hours