For independent IT consultants & freelancers

Turn your Outlook calendar
into Zoho Books invoices

Stop copy-pasting. Cal2Bill reads your calendar events and builds your invoice automatically — in seconds.

Start free trial → See how it works

15-day free trial  ·  No credit card required  ·  $14 USD/month after

Three steps. Done.

No complex setup. No learning curve. Connect, pick, invoice.

Step 01
🔗

Connect your accounts

Sign in with Microsoft and connect your Zoho Books account. Cal2Bill only reads what it needs — nothing else is stored.

Step 02
📅

Pick your calendar events

Select a client and Cal2Bill scans your Outlook calendar for matching events. Check the ones to include — rates are calculated automatically.

Step 03
🧾

Invoice built in Zoho

Hit Build Invoice and a complete draft lands in your Zoho Books — line items, rates, taxes, and all. Review, clean, and send.

Everything you actually need.
Nothing you don't.

Built for the way independent consultants actually work — not for enterprise teams with a dedicated billing department.

Smart deduplication

Already invoiced some events? Cal2Bill remembers. It adds new ones, updates changed ones, and skips duplicates — every time.

💰

Flexible billing types

Onsite hourly, service call flat fee, or offsite remote — each with its own rate and block structure. Configurable per client.

🇨🇦

Two-tax support

HST, GST+PST, GST+QST, or US sales tax. Cal2Bill handles Canadian provincial tax structures out of the box.

📦

Product & service items

Add parts, hardware, or service items to any invoice with a searchable picker — pulled directly from your Zoho Books item list.

🔒

Privacy first

Cal2Bill never stores your calendar contents, invoice data, or client names. Your billing data is yours — we just move it.

📱

Works on mobile too

Installable as a PWA on iPhone and Android. Invoice from anywhere — even from a client's site after the job is done.

I ran my IT consulting business for almost twenty years before the invoicing chaos finally caught up with me. Every month, the same thing — scroll back through Outlook, piece together what I did for each client, copy times into Excel, rebuild it all manually in Zoho Books. Hours gone. Repeatedly.

I kept putting it off. Weeks would pass. Then one day I sat down to do my invoicing and realized I hadn't billed some clients in well over a year. Real work, real hours — just never invoiced.

I'd been searching for a solution for most of those twenty years. Something that would just read my calendar and build the invoice automatically. Nothing existed that fit the way an independent consultant actually works. So I built it myself.

That's Cal2Bill. Simple by design — because your tools should work for you, not the other way around.

Guido — founder of Cal2Bill

Simple, honest pricing.

One product. Two billing options. No feature tiers, no paywalled essentials.

Monthly
$14 USD/mo

Billed monthly. Cancel anytime.

  • Full access to all features
  • Unlimited invoices
  • All billing types
  • Product & service item picker
  • Email support
Get started →

15-day free trial on both plans  ·  No credit card required  ·  Trial starts on your first invoice build

What users are saying.

Cal2Bill just launched. Be one of the first — try it free and share your experience.

💬

We're looking for beta testers.
Try Cal2Bill free for 6 months in exchange for honest feedback.

Get in touch →

Reviews from early users will appear here. Start your free trial and let us know what you think.

🚀

Built by a consultant, for consultants. If it doesn't work for your workflow, we want to hear about it.

Common questions.

Cal2Bill works with any Microsoft account that has access to Outlook calendar — personal Microsoft accounts, Microsoft 365 Business, and any Entra ID (Azure AD) tenant. If you can log into Outlook on the web, Cal2Bill will work for you.
Cal2Bill only processes events that contain your client's name in the subject line and are tagged with your billing categories (like "Onsite" or "Offsite"). Everything else is completely ignored. Crucially, Cal2Bill never stores your event data — it reads, calculates, and moves on.
Cal2Bill works with any paid Zoho Books plan. It uses the standard Zoho Books API and connects to the Canadian datacenter (zohoapis.ca) by default. If you're on the US datacenter, contact us and we'll help you get set up.
Your trial starts the moment you build your first invoice — not when you sign up. That means you can set up your account, configure your rates, and get familiar with the app before your clock starts. No credit card is required to start.
Yes. Cal2Bill supports per-client rate overrides stored directly on your Zoho Books contact custom fields. Set a default rate in your settings, and override it for specific clients when needed — Cal2Bill picks up the right rate automatically.
You can cancel anytime from the Billing section inside the app. Your access continues until the end of your current billing period. Your settings and data are retained for 90 days after cancellation in case you return, then permanently deleted.
Cal2Bill never stores your calendar event contents, invoice line items, or client names. We store only what's necessary to operate the service: your authentication tokens, your billing rate settings, and your subscription status. Full details are in our Privacy Policy.
Absolutely — that's exactly the situation Cal2Bill was built for. You can scan up to several months of calendar history in one go. Cal2Bill's deduplication system tracks which events have already been invoiced, so you'll never accidentally double-bill a client even if you run it multiple times.

We're here to help.

Have a question, found a bug, or want to explore a beta spot? Drop us a message and we'll get back to you — usually within one business day.

BUILT BY Guido — IT On The Spot, Toronto, Canada
RESPONSE Within 1 business day

🧪 Beta program open
Looking for 5–10 beta testers. Get 6 months free in exchange for honest feedback. Mention "beta" in your message.

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