Proudly Australian
Your entire business. One operating system.
Stack brings your work into one operating system. Add the modules that fit how you work. Penny, your AI assistant, is across all of it.
Built by ThinkSwift, MelbourneAustralian-owned · Data hosted in Australia
What is stack
One space.
Everything connected.
You already have a stack. Most people just call it ‘the tools I use for work.’ Stack OS brings them all into one place, so you stay focused on the main goal. One stack. Your stack. Keep moving.
Penny isn’t generic AI. She gets to know your business over time, and gets sharper the longer she works with you.
The base layer
Every stack starts
with Workspace.
Inbox, calendar, tasks, contacts and intelligence, all in one place. Workspace is the shared foundation every module sits on, so your business intelligence is never locked away in separate tools.
Almost everything you do in a day, you can do in here. Email a client, send a proposal, chase an invoice, brief your team, close a deal. The odd job that needs a different tool, you can still do. Less switching, more doing.
One space to log in. Multiple stacks, all connected, all the time.
Meet Penny
Penny is
always on.
The follow-up you forgot. The brief you didn’t have time to read. The call you missed while you were in a meeting.
Penny handles it. She has her own phone number, context across your entire stack, and she gets sharper the longer she works with you. Not a chatbot. Your assistant.
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Security
Your stack. Your data.
Your environment.
Every email, document and conversation that flows through stack lives on Australian servers. Never used to train AI. Never shared. Here is exactly how we protect it.
01
Australian data sovereignty
- Hosted in Australia. Your data never leaves the country.
- Fully compliant with the Australian Privacy Act.
- Built here, for here.
02
Bank-level security
- Encrypted at rest and in transit.
- Multi-factor authentication required on every login.
- Role-based permissions so the right people see the right information.
03
Your environment. Nobody else's.
- Your stack is structurally separate from every other workspace.
- Not just a contractual promise. An architectural one.
- Even worst case, access requires multiple independent security layers.
04
Penny learns from you. Only you.
- Everything Penny knows comes from your business. Not generic training data.
- Your data never trains an AI model. Not ours, not anyone’s.
- Closed circuit.
05
Compliance ready
- Security documentation available for board reference and internal policy reviews.
- As Australian privacy and AI standards evolve, stack evolves with them.
Want to dive deeper?
We are happy to walk you through our full data handling, privacy policy and security architecture before you sign up. No pressure.
Modules
Add what your business needs.
Every stack includes Workspace and Penny. Add the modules that fit how you work. Pay only for what you use. Add or remove any time.
+ More coming
HR, legal, procurement and bespoke modules via ThinkSwift are on the roadmap. Stack is modular. Add what you need, when you need it.
Integrations
Connects to everything you already use.
Google WorkspaceMicrosoft 365Microsoft TeamsSlackZoomWhatsAppWeChatXeroMYOBQuickBooksHnryStripeSquareGoCardlessDocuSignAnnatureDextHubdocEmployment HeroDeputySalesforceHubSpotDropboxZapierMake+ More coming
Getting started
Set up in an afternoon.
Pick the modules you need, connect your accounts, and you're in. No data migration. No IT team. No technical knowledge needed.
01Choose the modules your business needs
02Connect your email, calendar, and phone number
03Land in stack, fully set up, ready to go
Mobile
Same power on your phone
as your desktop.
stack works on your phone, not just your laptop. Full visibility, full control, wherever you are. Built as a mobile web app today, with a native app on the way.
Pricing
Your stack. Your price.
The first 100 workspaces get founding pricing, locked for your first 12 months — with the Sales and Client Services modules included at no extra cost for that first year.
Monthly billing. Start with a 14-day free trial — no card to start.
First 100 workspaces· closes 31 Oct 202614-day free trial
Pro Workspace
For independent professionals and solo operators.
$49/moSave 69%
$15/month
locked for your first 12 months, then $49/month
- Workspace: inbox, calendar, tasks, contacts and intelligence
- Sales and Client Services modules included for your first 12 months
- Penny, your AI assistant for your workspace
- Task suggestions and task assistance
- Personal task tracking and updates
- Assisted daily and meeting briefs, with smart prioritisation
- Smart Folders — organised the way you like, sorted by AI
- 1 user
- 5,000 contacts and 25 GB storage
- 3,000 Penny messages per month
- Core integrations
- No lock-in contract
14-day free trial
Team Workspace
For growing teams ready to consolidate.
$196/moSave 69%
$60/month
locked for your first 12 months, then $196/month
- Everything in Pro Workspace
- Sales and Client Services modules included for your first 12 months
- Team AI assistant — Penny across the whole team
- Team task suggestions
- Team inbox — connect multiple inboxes into one shared view
- Team calendar and scheduling
- Up to 5 users (add more at $39/month each)
- 50,000 contacts and 100 GB storage
- 15,000 Penny messages per month
- Guided setup
- No lock-in contract
Enterprise
For firms that need full control. Custom pricing, built around you.
Custom
From $1,200/month plus build fee
- Everything in Team Workspace
- Unlimited users
- Custom modules built by ThinkSwift
- Dedicated account manager
- SLA and priority support
Reviews
What early users are saying.
Monday morning admin went from three hours to twenty minutes. Penny handles the enquiries that used to pile up over the weekend before anyone even gets in.
Sarah Chen
Principal, Chen Advisory Group
I was paying for HubSpot, Calendly, Mailchimp and a virtual receptionist. Stack replaced all of them. After three months, Penny was answering client calls with context I’d forgotten myself.
David Marchetti
Director, Marchetti Financial Planning
My team actually uses this one. That is the highest praise I can give a tool. Setup took an afternoon. They were running on it by the next morning.
Priya Nair
Managing Partner, Nair & Associates Recruitment
FAQ
Questions we actually get asked.
An afternoon. Pick your modules, connect your email, calendar and phone number, and you land in stack fully configured. No data migration. No IT team. No technical knowledge needed.
Not on day one. Stack connects to the tools you already use, including Xero, MYOB, QuickBooks, Google Workspace and Microsoft 365. Most teams consolidate over the first few months as they see what stack does better. You choose the pace.
Yes. Australian phone numbers, Australian business hours, Australian privacy law, supported by a Melbourne team. Not a US platform adapted for Australia. Designed here, for here.
Your data belongs to you. Stored in Australia. Never used to train AI models. We operate under Australian privacy law. Happy to walk you through how it works on a call before you sign up.
Every email, document, meeting note and conversation that flows through stack is automatically read and remembered by Penny. When she answers a call, drafts a reply, or flags an overdue invoice, she draws on your actual files and history, not generic training data. The longer you use stack, the sharper she gets. No setup required.
The first 100 workspaces get founding pricing, locked for 12 months. Pro Workspace is $15/month for your first 12 months, then $49/month. Team Workspace is $60/month for your first 12 months, then $196/month, with extra users at $39/month each. Both include the Sales and Client Services modules at no extra cost for your first 12 months. Founding places close at 23:59 AEST on 31 October 2026, or once the first 100 are taken — whichever comes first. Monthly billing, with a 14-day free trial and no card to start.
Yes. Stack is a mobile web app with full feature parity. Same visibility and control as desktop. Native iOS and Android apps are on the roadmap.
Join the public beta and start your 14-day trial.
The first 100 workspaces get founding pricing, locked for the first 12 months — with the Sales and Client Services modules included. Closes 23:59 AEST, 31 October 2026. No card to start.
Join public beta