SpanCalc for RevitProvided by Acme Tools
Active - Model
- Named
- Seats
- 4 of 5 assigned
Current term ends 27 Aug 2027
View details ↓Licensing for AEC software
Build the tool you always wanted.
And we’ll handle the licensing.
Add sign-in, named and floating seats, offline access and a customer portal without building any of it yourself.
Acme Tools
2
products3
customers12
licenses7
recent activationsProducts in use
Manage products →Product
License use
Latest term
SpanCalc for Revitspancalc-revit
6 of 7
12 Aug 2026
SpanCalc on sitespancalc-field
5-seat pool
2 Aug 2026
BigFirm
Your licences
SpanCalc on siteProvided by Acme Tools
Active - Model
- Floating
- Seats
- 2 of 5 held now
1 seat is borrowed offline
View details ↓See your products, customers and license use in one place.
Customers see the products they can use before opening seat and device details.
Licensing without the fuss.
Sell to individuals or organisations. Customers sign in inside your plugin, and you choose the seats and the term. Drawspan issues signed leases, renews them and keeps the record.
No license keysCustomers sign in. There is nothing to paste, lose or share.
Works offlineA valid signed lease keeps the tool running through a temporary
outage, only until it expires.
Named or floatingGive a seat to one person or share a pool across a firm.
Built for AEC tools
The .NET SDK for software that runs inside other software.
Ship one dependency-free assembly across old and new .NET hosts, including plugins that share a process.
- One DLL to ship
- No package dependencies to collide with the host, from .NET Framework 4.8 through .NET 10.
- Signed leases, checked locally
- The SDK verifies cached leases against your embedded public key before granting access.
- One machine means one machine
- Revit, Rhino and Grasshopper running together count as one machine, not three.
For your codebase
It’s 10 lines of code.
Install the NuGet package in your tool. Your customers sign in and get licensed immediately.
Built on netstandard2.0 More languages coming soon
MyPlugin.cs
using Drawspan.Client;
var license = DrawspanLicense.Start(new DrawspanOptions
{
ProductId = "your-product-id",
VendorConfig = YourVendorConfig.Instance,
HostApp = "Revit",
HostVersion = "2026"
});
if (license.Status.State == LicenseState.Licensed)
RunProtectedWork();Inside Drawspan
A console for you and a portal for your customers.
Track products, customers, deals, seats and machines in your console. Your customers manage their licenses and seats in their own portal.
Vendor-console and customer-portal sessions stay on separate authorization paths. Signing in on one side does not grant access to the other.
Acme Tools
2
products3
customers12
licenses7
recent activationsProducts in use
Manage products →Product
License use
Latest term
SpanCalc for Revitspancalc-revit
6 of 7
12 Aug 2026
SpanCalc on sitespancalc-field
5-seat pool
2 Aug 2026
Organisation
BigFirm
Product
Model
License use
Current term
SpanCalc for RevitAnnual term
Named
6 of 7
Ends 12 Aug 2027
SpanCalc on siteAnnual term
Floating
2 of 5 held
Ends 2 Aug 2027
Next term ready to recordCarry the agreed seats and dates into the next customer term.
BigFirm · SpanCalc for Revit
Seats and machines
Person
Seat
Last heard
Jane Brownjane@bigfirm.test
Named
2 hours ago
Sam Leesam@bigfirm.test
Named
Yesterday
Priya Shahpriya@bigfirm.test
Named
6 days ago
“Last heard” records a request from the machine. It does not claim the person is online now.
See every product, customer and license total from the home dashboard.
Record what the customer bought and keep each term attached to the deal.
Check seat assignments, devices and when each machine last contacted Drawspan.
BigFirm
Your licences
SpanCalc for RevitProvided by Acme Tools
Active - Model
- Named
- Seats
- 4 of 5 assigned
Current term ends 27 Aug 2027
View details ↓SpanCalc on siteProvided by Acme Tools
Active - Model
- Floating
- Seats
- 2 of 5 held now
1 seat is borrowed offline
View details ↓BigFirm · SpanCalc for Revit
Named seats
Person
Seat since
Devices
Jane Brownjane@bigfirm.test
4 Mar 2026
2
Sam Leesam@bigfirm.test
18 Apr 2026
1
Priya Shahpriya@bigfirm.test
2 Jun 2026
2
Take a seat back from someone who has left, then assign the available seat to their replacement.
BigFirm · SpanCalc on site
Currently holding a seat
Person
Holding since
Hold type
Devices
Sam Leesam@bigfirm.test
2 hours ago
Standard lease
1
Priya Shahpriya@bigfirm.test
Yesterday
Borrowed offline
1
A borrowed seat stays with that person until the offline lease expires.
Customers see every active license and how many seats are in use.
Customer admins assign seats, take them back and give them to someone else.
They can see who holds a floating seat and whether it was borrowed offline.
Connected billing Acme Tools
Listening for payments S
StripeCheckout and subscriptions
Connected L
Lemon SqueezyStore and subscriptions
Available Payment received BigFirm bought SpanCalc for Revit 5 named seats · 27 Aug 2026 to 27 Aug 2027
License recorded BigFirm · SpanCalc for Revit Ready when the customer signs in
Active Customer billing
Connect your payment processor.
Use Stripe or Lemon Squeezy, or call the vendor API from the billing system you already have. When a payment completes, Drawspan records the customer, seats and term.
Set up billingDrawspan takes no cut of your customer payments. You are billed separately for your Drawspan plan.
The whole journey
How Drawspan works.
Four simple stages, from setting up your product to managing licenses and seats.
Set up your product
Choose how its seats and terms work.
The deal is recorded
Add it yourself or let your billing system do it.
Buys your tool
They buy directly from you, using the checkout you already have.
Deploy your tool
Ship it through the channel that already works for you.
Installs and signs in
There is no license key to enter.
Manage licenses
See customers, terms, seats and when machines last checked in.
Manage seats
Assign seats and see active licenses in one place.
Drawspan
License your tool with Drawspan.
Start free, add your product and wire up the SDK.