The hidden cost of per-seat pricing for UK counselling agencies

If you run a UK counselling agency or counselling CIC, you've probably noticed something about practice management software pricing: it punishes you for growing.

Most platforms charge per therapist. Add a clinician, add to your monthly bill. Add another, add again. By the time your agency reaches 15–25 therapists, you're paying hundreds of pounds per month — for the same software that costs a solo practitioner a fraction of that.

This guide breaks down the real cost difference between per-seat and flat-rate models at UK agency scale — with current published prices from the four most common platforms used by UK counselling agencies. We've done the math so you don't have to.

Honest disclosure

This guide is published by Sessionly, which uses flat-rate agency pricing. So we have a position. But we've used current published pricing (as of June 2026) from each competitor, and we'll point out honestly where their pricing makes sense — including the one agency size where a competitor is actually cheaper than us.

The author is Mark Devereux, founder and CTO of Sessionly. Sessionly is built with my wife Kate Devereux, an NCPS-registered therapist who runs Earth Wisdom Therapy CIC.

The four platforms compared

Four platforms commonly evaluated by UK counselling agencies:

• Sessionly— flat-rate agency tier, £49.99/month or £499/year, up to 25 therapists
• Kiku— £34.99/month base for 3 therapists, then £9.99/month per additional therapist
• WriteUpp— £45.99/month for 2 clinicians, then tiered per-user charges (£15/user for 3–10 users, £12/user for 11–25)
• Cliniko— £199/month at the 13–25 practitioner tier (smaller tiers available at lower prices)

The “Sessionly” and “Cliniko” rows are flat tiers. The “Kiku” and “WriteUpp” rows are per-seat. Let's see what that means at agency scale.

The math at meaningful agency sizes

Here's what each platform actually costs as your agency grows:

A few things worth noticing.

Where Kiku is genuinely cheaper

At 3 therapists, Kiku's £34.99 entry tier is cheaper than Sessionly's £49.99. That's a £15/month, £180/year saving for very small agencies running on price alone.

We'll come back to whether price-alone is the right way to evaluate at this scale, but on the math, credit where it's due: for the smallest UK counselling agencies (3 therapists or fewer) doing private-pay work, Kiku's entry pricing is competitive.

The picture changes quickly as you grow.

Where flat-rate starts to dominate

At 5 therapists, the gap is small but Sessionly's flat £49.99 is already the cheapest option — and importantly, it stays £49.99 whether your agency has 5 therapists, 10, 15, or 25.

At 10 therapists:

• Sessionly:£49.99/month
• Kiku:£104.92/month (more than 2x Sessionly)
• WriteUpp:£165.99/month (more than 3x Sessionly)

At 25 therapists:

• Sessionly:£49.99/month (£599.88/year)
• Cliniko:£199/month (£2,388/year — 4x Sessionly)
• Kiku:£254.77/month (£3,057/year — 5x Sessionly)
• WriteUpp:£345.99/month (£4,151/year — 7x Sessionly)

The annual numbers are where this gets serious. A 25-therapist UK counselling agency using WriteUpp pays roughly £4,151 per year in software costs. The same agency on Sessionly pays £499 (annual subscription) — a difference of £3,652 per year. That's the equivalent of approximately 35 funded therapy sessions, or part of a clinical supervisor's annual fees, or a year's worth of marketing investment.

The compounding cost problem with per-seat models

The deeper issue with per-seat pricing isn't just that it's more expensive at scale. It's that your software bill grows in lockstep with your team — which is exactly when you want the cost to feel predictable.

A growing UK counselling agency typically has:

• Unpredictable client volume (funded contract starts and ends, EAP referrals fluctuating, seasonal patterns)
• Variable therapist hours (some full-time, many part-time, sessional staff)
• Tight margins (counselling fees are often £40–£80 per session, with significant overhead)
• Limited finance team capacity (often the director handles operations and clinical work)

In this environment, software costs that grow with your team mean:

• Budgeting becomes harder.Each new therapist hire adds £12–£20/month to fixed costs.
• Sessional therapists become expensive. A therapist who does 2 sessions per week still costs you their full per-seat fee.
• Scaling is penalised.The bigger you get, the more you pay per month — even though your per-therapist revenue isn't necessarily increasing.
• Decisions get distorted.Should you add that sixth therapist? Per-seat pricing makes you think twice in ways flat-rate doesn't.

Flat-rate pricing inverts this. Your software cost is locked. Grow from 5 therapists to 25 and your software bill doesn't move. The savings compound the bigger you get.

Where feature fit matters more than price

Price is the easy comparison. It's also the incomplete one.

For some UK counselling agencies, the question isn't “which platform is cheaper” — it's “which platform can actually do the job.”

If your agency is private-pay-only, simple per-client invoicing, no funding tracking required, no commissioner reporting — then price comparison is most of the decision. At 3 therapists, Kiku is fine. At 10+, Sessionly is dramatically cheaper.

But if your agency is a CIC, charity, or grant-funded service, the picture changes:

• Do you need to track sessions against funding allocations (NHS framework contracts, Lottery grants, council commissioning)?
• Do you need to report demographics to commissioners on a quarterly or annual basis?
• Do you handle block bookings paid by third parties (EAPs, employers, funders)?
• Do you manage therapist invoices and reconciliation against funded session caps?

For these workflows, Sessionly is the only platform that natively supports them. Funding pot tracking, demographic reporting, and third-party block payment workflows aren't features Kiku, WriteUpp, or Cliniko offer. Even where one of those platforms is cheaper at your size, it cannot do the job.

This isn't a marketing claim — it's a feature checklist that UK counselling CICs face every year when commissioners ask “show us your year-on-year demographic data.” The agencies that have answered that question with Excel exports from generic clinical software are the ones who switch to Sessionly.

The honest summary

Per-seat pricing isn't always wrong. For very small agencies (3 therapists or fewer) doing simple private-pay work, Kiku at £34.99 is competitive with Sessionly at £49.99 — and the gap on features alone may not justify the price difference.

But for agencies of any meaningful scale:

• From 5 therapists upward:Sessionly's flat pricing is the cheapest option
• From 10 therapists upward:Sessionly is dramatically cheaper than per-seat alternatives (typically 2–3x)
• From 13 therapists upward:Cliniko's flat tier kicks in at £199/month — still 4x Sessionly
• At 25 therapists:The annual difference between Sessionly and WriteUpp is £3,652

For grant-funded CICs and charities, the price difference matters even more — but the feature gap matters most. Sessionly is the only platform reviewed that handles funding pot tracking, demographic reporting, and third-party block payment workflows.

How to evaluate this for your own agency

A few questions to ask, in order:

1. What's your therapist count today, and where do you expect to be in 18 months? Per-seat pricing assumes you won't grow. If you're planning to grow from 5 therapists to 15, the math shifts dramatically.
2. Is your funding model private-pay, or do you have grants/commissioning contracts? This determines whether feature fit beats price comparison.
3. What's your tolerance for unpredictable software costs? Per-seat means every hire adds a line to your monthly bill. Flat-rate means your software is a fixed cost.
4. Are you currently using spreadsheets for any agency operations? Funding pot tracking, demographic reporting, and therapist payment reconciliation are common spreadsheet workarounds — and Sessionly replaces them natively.

Final note

We've tried to be honest with the numbers here. Software pricing changes — if anything in this guide is wrong, email hello@sessionly.uk and we'll update it. We aim to keep this current.

If you're evaluating practice management software for your UK counselling agency, Sessionly's agency tier is £49.99/month (or £499/year for a 17% saving), covers up to 25 therapists with no per-seat overage, and includes the CIC-specific features we've covered above. There's a 14-day free trial with no credit card required.

If you're a smaller agency where price-on-price matters most, Kiku may genuinely be the right choice — and we'd rather you find that out before signing up with us than regret the decision later.

See Sessionly's agency features, or start a 14-day free trial at sessionly.uk.

Mark Devereux is the founder and CTO of Sessionly, UK practice management software for therapists, counsellors, and counselling agencies. He builds Sessionly with his wife Kate Devereux, an NCPS-registered therapist who runs both a private counselling practice and Earth Wisdom Therapy CIC.