Follow-ups slip, proposals take days, and half your week disappears into admin. The Consultant Operating System is a ready-to-use AI system that runs on your laptop, connects to your tools, and handles everything that isn't client work.
From €297 · one-time · no subscription
I've used this before coffee every morning since January 2026. Join the founding list: first access to 50 founding spots at 40% off list price when doors open.
No coding, no terminal. If you can type a message, you can run this.
The problem
These aren't edge cases. This is Tuesday.
What did we discuss last time? What did I promise? Where's that email? The CRM says one thing, your notes say another. So you wing it.
That prospect who said "send me a proposal this week"? It's been three weeks. Every dropped follow-up is revenue you'll never see.
More clients means more admin means less time for actual work. You've hit the ceiling that every solo consultant hits.
No time for LinkedIn, no system for thought leadership, and your last blog post is from 2023. Your pipeline depends on referrals and luck.
Who this is for
You juggle 3-5 clients, do your own sales, deliver the work, and handle admin. The OS handles your pipeline (/pre-discovery, /proposal), content (/linkedin-post, /content), and operations (/invoice, /finance). Take on that next client without working weekends.
You serve multiple stakeholders internally. The OS generates meeting briefs (/pre-meeting), builds executive decks (/deck, /steerco), and tracks commitments across all your channels. Leadership stays informed without eating your calendar.
You manage deliverables, timelines, and stakeholders across projects and program tracks. The OS runs risk scanning, dependency mapping, and status updates automatically. /checkin shows what needs your attention today.
"Every time you open ChatGPT, you start from zero."
It doesn't know your clients. It doesn't remember what you promised in last week's call. It can't check your email or update your CRM. You spend more time explaining context than getting work done. I had the same problem. So I built something different.
Everything on the left, I used to do manually. Everything on the right happens automatically now.
How it works
You probably already use AI. An operating system takes it further: persistent memory, direct access to your tools, and ready-made workflows for your specific job. It runs on your own laptop in a chat window.
You type a command in a chat window. The OS does the rest. Here are four real examples.
Founding member pricing for the first 50. Joining the list is free.
What you get
Sales, delivery, content, operations, knowledge management. Each one comes with ready-made workflows and automated assistants that connect to your actual tools.
Morning check-in compiles your day. Evening checkout logs progress, updates tasks, and sets tomorrow's priorities. Every session builds on the last.
Meeting briefs, proposals, slide decks, workshop prep, executive updates. Every client touchpoint handled with consultant-grade quality.
Discovery call prep, lead enrichment, CRM sync, follow-up timing, outreach management. Your pipeline moves while you deliver.
LinkedIn posts planned, written, reviewed, and analyzed. Your authentic voice enforced. Thought leadership without spending your evenings writing.
Every correction you give becomes a rule it follows next time. Decisions get logged. A 5-advisor council stress-tests your thinking before you commit.
Invoicing, financial dashboards, tax prep, compliance checks, meeting logistics. The back-office you never got around to hiring.
No coding required. You interact with it by typing messages, like any chat app.
Download Claude Code (free, by Anthropic). Open it in VS Code, a free editor that works like a chat window. Available on Mac, Windows, and Linux.
One command installs the full system. We guide you through connecting your email, calendar, and CRM. Core features work immediately.
Your AI back-office is running. It pulls your calendar, email, and tasks, and shows you what matters today.
/checkin
There are 1,400+ free AI workflows out there. I tried them. Here's what's different about a system built by someone who runs a real practice with it.
When you type /pre-meeting, it pulls your CRM records, last call transcript, open email threads, and commitments you made, all into one brief. Free prompts can't do that because they don't know your tools exist.
Proposals follow the same structure top consulting firms use. Slide decks are built the way McKinsey builds them. Reviews check six dimensions in parallel. Real methodology, encoded into workflows you can run with one command.
Over 6 months of daily use, I've taught it 112 specific rules from my own mistakes. "Don't use that word in proposals." "Always check the calendar before suggesting a meeting time." Free prompts start from zero every time.
Different CRM? Different accounting system? Different country? Swap out the settings without breaking the workflows. Replace Zoho with HubSpot. Switch Dutch tax rules for UK rules. The system adapts to your setup.
I'm Tijmen Onland. I've spent 11 years in digital strategy consulting, from boutique firms to transformation programs for some of Europe's largest enterprises. I built The Consultant Operating System because I was tired of losing context between meetings, rewriting every proposal from scratch, and doing admin until Friday evening. I've opened it before coffee every morning since January 2026. It runs my calendar, my pipeline, my content, my invoicing.
Follow along on LinkedIn →What early users say
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Founding member pricing
After the first 50, list price applies. One-time payment to us, and you run it on your own Claude subscription, billed directly by Anthropic.
Set it up yourself with our guide
One-time. €497 after founding period.
✓ 7-day money-back guarantee
Join the waitlistSet it up yourself, with support at your back
One-time. €997 after founding period.
✓ 7-day money-back guarantee
Join the waitlistCustom build for your practice
One-time. €2,497 after founding period.
✓ 7-day money-back guarantee
Join the waitlistAll tiers include 12 months of updates, released quarterly. After year one, updates continue for an optional €149/yr; founding members lock €99/yr, for good.
Done-With-You is a focused one-time build, not an open-ended retainer. Extra workflows or integrations after handover are quoted separately.
Consultants bill only about 3 of every 8 working hours. The rest drains into admin and rebuilding context. The Consultant OS gives a conservative slice of that back. Say it reclaims just 3 hours a week. The only thing we need from you is your rate:
“A client deck that used to take me two days took about an hour last week. One deliverable, and the maths already made sense.” — Tijmen Onland, builder of The Consultant OS
Assumes a deliberately conservative 3 hours reclaimed per week; most users report far more. Payback calculated against the Kickstart tier (€597, one-time). Requires a Claude Pro or Max subscription ($20-200/month, paid separately to Anthropic). 7-day money-back guarantee at launch: if it doesn't save you time, you get a full refund. Prices excl. VAT.
Early access pricing and first to install. Joining is free.
Joining the list is free. We'll reach out with early access details.
Privacy: your name, email and role are stored by Promptiers (controller) in Google Workspace, used only to contact you about The Consultant OS. No sharing with third parties, no tracking. Unsubscribe or request deletion anytime via tijmen@promptiers.com.
Not ready yet? Follow the build on LinkedIn →
We'll be in touch with early access details. Follow along on LinkedIn for behind-the-scenes updates.
No. You interact with it by typing messages in a chat window, not by writing code. It runs in VS Code, a free app that looks like WhatsApp for your work. The setup guide walks you through everything. If you can send a message, you can use this.
Claude Code is an app by Anthropic (the company behind Claude AI) that runs on your computer and connects to your tools. Think of it as Claude, but with hands: it can check your email, update your CRM, and generate documents. You need a separate Claude subscription ($20/month for Pro, up to $200/month for Max) paid directly to Anthropic.
Yes. Every tier comes with a 7-day money-back guarantee from the day you get access. If it does not save you time, email tijmen@promptiers.com and you get a full refund. No forms, no questions.
Updates cover the framework: compatibility with new Claude Code versions, improvements to existing workflows, and new workflow packs we release — delivered via a single command, quarterly. Your data and customizations are never touched. They don't include custom development, debugging of your own integrations, or feature requests — that's what the community and (on Kickstart and Done With You) support windows are for. After year one, updates continue via an optional subscription (€149/yr) — founding members lock it in at €99/yr.
Your files, knowledge base, and memory stay on your own computer as plain text files. When you interact with the AI, your conversation is processed by Anthropic's servers. Anthropic does not train on your data on paid plans, but verify this in your account settings. We recommend checking your client's compliance requirements before loading sensitive data. You control exactly which files and tools the system can access.
Almost anything you already use. If a tool has an API (the standard way apps connect, which nearly all of them have), it can plug in. The common ones work out of the box: Gmail, Google Calendar, Drive, Docs, Sheets, Notion, LinkedIn, WhatsApp, Fireflies, Granola, and CRM systems (Zoho Bigin included, others via configuration). Whatever you run, the setup guide walks you through connecting it.
Yes. The Consultant OS is a folder structure that layers into your existing project. Adopt the full system or cherry-pick specific workflows and assistants. Everything is modular. Your existing setup stays intact.
Every tier includes the built-in /setup wizard: it walks you through your configuration step by step and verifies every connection. Core features work immediately after install. Full integration with all your tools typically takes an afternoon. On Kickstart, you get a personal review of your configuration and 90 days of email support while you do it. Done With You means we deliver it fully configured.
Different CRM, different accounting system, different country? Swap out the settings without breaking anything. If you need custom workflows for your specific niche, the Done With You tier includes building those with you.
Join the founding list. One-time investment, permanent founding pricing. Locked for the first 50.
Join the founding list