For agencies, studios and freelancers
Not another all-in-one. The one built around billable hours, from first enquiry to paid invoice. Meet Thames, the built-in AI assistant that takes the busywork off your team.
No card to start
Fourteen subscriptions it replaces
14 logins and 14 bills become 1 of each.
The problem
One workspace for the work, the money and the people, built for client-services teams of 1–25.
01Pipeline
Drag a deal to the next stage and the forecast updates. Every stage change lands on the deal’s activity. Multiple pipelines, weighted forecasts by month, stage and pipeline.
Beside email, on the person’s record: LinkedIn WhatsApp02Projects
Tasks carry their estimates and projects their budget. The dashboard flags over-budget projects before the invoice goes out, not after.
03Retainers
Track hours against a monthly bucket, with roll-over rules and warnings at 80% and 100%. An optional pause when the cap hits.
04Invoicing
Pick the approved billable hours from the invoice itself. They’re marked billed, so nothing goes out twice and nothing sits forgotten. Clients pay by card or Direct Debit.
05AI assistant
Ask Thames about any client, project or invoice and it answers from your records. It drafts the email, the chart or the meeting summary, and asks before anything is sent.
Works with Claude ChatGPT06Automations
Workflows do it for you: a won deal starts its project, an overdue invoice chases the client. Triggers, branches, waits and webhooks, with a log of every run.
Keeping context
Each step carries the last one with it, so nobody re-types or re-explains.
New lead · website form
CompanyBrookfield Health
ContactPriya R.
SourceForm
Lead
From your form, with its source.
Proposal
Brookfield HealthRebrand, phase 1
Opened3×
SignedPriya R.
Proposal
Read-tracked, signed online.
Project · from won deal
Brookfield rebrand
Brookfield Health6 / 15 tasks
Project
Created when the deal is won.
Timesheet · this week
Brookfield Health6.0 h
Atlas Freight4.5 h
Verity Labs3.0 h
Hours
Logged against the project.
Invoice · INV-0142
Brookfield Health£2,280.00
19 h from the timesheet · excl. VAT
Invoice
Built from approved hours.
Payment received
Brookfield Health£2,736.00
Direct DebitPaid
Paid
By card or Direct Debit.
Then open the project, and it’s all there.
1 time typed0 times copied across
See how it works →The stack maths
A team of five, paying monthly for the five tools almost every agency already has.
Today · five tools
a month, + tax
CRM and sales pipeline · HubSpot Sales Hub$100
Project management · Asana$67.45
Time tracking · Harvest*$45
Invoicing · FreshBooks*$87
Scheduling links · Calendly$60
Nucle.OS Studio
Every module$225+ tax a month,
five people
The same five jobs, and nine more tools included: cold email, proposals, e-signature, client portal, forms, meeting notes, docs, whiteboards and automations.
$134.45less a month
$1,613.40a year, on the five alone
The five above Nine more tools Nucle.OS
Five people, billed monthly, at each vendor’s published list price, checked 18 Sep 2026. Prices exclude tax.
*We couldn’t confirm a monthly price, so the yearly rate is used. That makes them look cheaper, never the saving bigger.
Client portal
Your client gets a portal in your branding, on every plan. They see what they need to; you also see the hours and the budget behind it.
Brookfield rebrandBrookfield Health
Progress40% · 6 / 15 tasks
Waiting on you
1 form to fill inFill in
2 new messages from the teamOpen
Brookfield rebrandBrookfield Health
Hours against budget Only you
26.5 hof 60 h budget
Overdue Shared
Team Shared
MVJLAKSLMara leads
Timeline Shared
4 Aug → 30 Oct6 weeks remaining
What your client can do there
Follow the work
Progress, milestones, tasks and the timeline, as they move.
See what’s on them
One list of what’s waiting on them: forms, new messages, invoices due.
Talk to the team
Chat on the project, not in a forwarded email chain.
Share files
Upload and download, on the project they belong to.
Report issues
Log feedback and bugs in the project’s QA log.
Watch the retainer
Hours used against the month’s bucket, with roll-over.
Sign agreements
Sign online, and find every signed copy later.
Pay invoices
By card or Direct Debit, or set up autopay. You choose who sees money.
Shared progress, milestones and due dates, team, files, invoices Only you hours and budget
What your clients see →What’s in it
Grouped by the job they do, not by where they sit in the menu. Nothing here is held back on a cheaper plan.
Nothing is held back on a cheaper tier. Plans differ on how many of you there are and how much you use the parts that cost us money.
Your clients get their own way in - projects, files, chat and invoices - without a seat, a licence, or sight of anything else.
Custom roles across all 31 modules, so a contractor sees the project and not your rates or invoices.
Ask it to draft, find or change something. It works from day one on your plan's included requests; add your own key and its use doesn't count against them.
From a name you half-remember to a signed agreement, without leaving Nucle.OS or re-typing anything.
8 modules
Leads
Catch enquiries from your website forms and imports before they turn into a lost note.
Prospecting
Find and enrich contacts at companies you want to work with, on your own Apollo account.
Companies
Every organisation you deal with, with the people and history attached.
Contacts
People as records of their own, not rows hidden inside a company.
Projects that know their own hours and budget, and invoices that read from the work you already logged.
9 modules
Clients
The delivery-side record for a company or person you’ve won, kept apart from the sales pipeline.
Projects
Types, templates, milestones and stages, set up once and reused every time.
Tasks
A list across projects, a board inside each, and a task that remembers its project.
Time
Start a timer from anywhere, or log the hours on the task afterwards.
Client conversation in the same place as the work it is about, not in somebody's inbox.
7 modules
Connect your Gmail; threads land on the contact, company and deal they’re about.
Sequences
Multi-step outreach that stops as soon as somebody replies.
Chat
Internal and per-project threads, with mentions that link to real records.
Calendar
Your Google Calendar beside the workspace's tasks, deals and projects, in one view.
The three questions a Monday starts with: how are we doing, who is doing what, and what were we trying to achieve.
3 modules
Dashboard
Your day on top - your next call, what's due and what's waiting on you - then the business underneath.
Team
Roster, roles, utilisation and who is doing what this week.
Strategy
Objectives with clear finish lines, reviewed rather than written once.
The context that usually lives in somebody's head, written down where the next person can find it.
4 modules
Documents
Versioned files with folders, previews, and links that expire.
Notes
Rich notes that can @mention any record, shareable outside the workspace when needed.
Whiteboards
Draw the thing, attach it to the project it explains.
Company knowledge
Company facts the assistant can answer from, kept in one place.
Before you move your data in
Six things worth checking before you move your data, including one we won’t claim.
Deleted isn’t gone.
Anything deleted waits in the bin for 15 days, and can be restored until then.
Every workspace walled off.
Hosted in the EU, in a database that keeps each workspace’s records apart, so no other workspace can see yours.
Two-factor sign-in.
With an authenticator app, whether you sign in with a password or Google.
Changes on record.
A 24-month audit log of who changed settings, money, access and sharing, on every plan.
Leave with your data.
Export your core records any time, even while the workspace is paused.
A UK company, registered with the ICO.
The ICO is the UK’s data regulator. We’re not SOC 2 certified, and won’t pretend otherwise.
Company 14790177, England and Wales · ICO ZC266973 · public DPA, privacy policy and terms.
Where it’s held, who processes it, and for how long →Pricing
All 31 modules, no feature gates. Plans differ on how many of you there are and how much you use the parts that cost us money.
Freelancers, and teams of up to three
$23.20 + tax a month if billed yearly. Save 20%
Billed yearly. Save 20%
Included every month
AI assistant included: 200 requests a month
300 minutes of call recording and transcription
1,000 emails we send for you
3 connected mailboxes · more at $6 + tax a month each
Agencies and studios of three to twenty-five
$36 + tax per seat a month if billed yearly. Save 20%
From $135 + tax a month, at the 3-seat minimum
Billed yearly. Save 20%
From $108 + tax a month, at the 3-seat minimum
Included every month
AI assistant included: 150 requests per seat a month
500 minutes of call recording and transcription per seat
10,000 emails we send for you
2 connected mailboxes per seat · more at $6 + tax a month each
Agencies of eight or more who want help moving in
$55.20 + tax per seat a month if billed yearly. Save 20%
From $552 + tax a month, at the 8-seat minimum
Billed yearly. Save 20%
From $441.60 + tax a month, at the 8-seat minimum
Included every month
AI assistant included: 150 requests per seat a month
2 connected mailboxes per seat · more at $6 + tax a month each
Two of you? Solo plus one person is $44 + tax a month.
When your included AI requests run out, the assistant stops. Nothing is added to your bill: carry on with a pack or your own key.
Prices exclude sales tax. Any tax that applies is added at checkout, based on where your business is.
Clients pay by card or Direct Debit through your own Stripe account. The money goes straight to you. Stripe charges its usual fees; we add nothing on top.
FAQ
HubSpot is built around a sales funnel: lead scoring, marketing email and handoffs between teams. Nucle.OS is built around the work after the yes: proposals that become projects, hours against budgets and retainers, and invoices built from those hours. There's no lead scoring here, and no pretending deliverables and deals are the same thing.
Not yet. Email and calendar connect through Gmail and Google Calendar only. Everything else works whichever email you use, but your inbox and calendar won't sync.
Yes. Import clients, contacts, deals, tasks, leads and invoices from CSV, with a template for each and a mapping step, so your column names don't need to match ours. Projects aren't imported: create them, from a project type if you want its milestones and tasks, then bring their tasks in.
Yes. Studio and Agency are priced per seat, with no cap on how many people you invite. On Solo you can add up to 2 more people at £12 + VAT a month each ($15 plus tax in US dollars). Inviting someone takes one email; they can add a password or Google sign-in later. Custom roles decide which modules each person sees, and what they can edit.
No. Every plan includes AI requests each month: 200 on Solo, 150 per seat on Studio and Agency. When they run out, the assistant stops rather than running up a bill: buy a pack of 500 more requests, or add your own Anthropic, OpenAI or Google key at any time. Its use is billed by that provider, never by us. A $50 monthly spending limit is set by default, and you can change it.
Every workspace is walled off at the database level, so one workspace can never read another's data. We're hosted on Supabase in the EU, which backs up the database automatically, and stored files are copied to an off-site backup. Sign-in supports two-factor authentication, and every plan keeps a 24-month audit log of changes to settings, money, access and sharing. We're not SOC 2 certified and we won't pretend otherwise: if you need a formal audit before you can sign, talk to us and we'll tell you honestly where we are.
You can export companies, clients, contacts, deals, projects, tasks, lists, leads and an index of your documents to CSV from Settings → Export, or download the lot as a zip. For anything else, ask, and we'll get it to you. We're not going to hold your data hostage.
Not a public REST API yet. Webhooks work both ways: a webhook can start a workflow, and a workflow can call any public web address. That's how you connect tools like Zapier or Make today. If an API would decide it for you, tell us; it shapes what we build next.
All of them, grouped by topic →
Ask anything about what it does, who it's for or what it costs. It answers only from this site.
Set up a workspace in a minute, import your clients from a CSV, and send next month’s invoices from the hours you log.
Fourteen days free · no card to start · your data stays yours
When you connect a Google account, Nucle.OS shows your email next to the client it belongs to, sends mail you write to your clients from your own address, and keeps your bookings and meetings in step with your Google Calendar. See the privacy policy for exactly what is accessed and how to disconnect.
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