Predictable
The same conditions produce the same configured action.
Deterministic automation for Google Calendar
Your calendar.
Your rules.
Automatically color Google Calendar events, prevent back-to-back meetings with automatic buffer time, block travel time, and protect your availability across work and personal calendars. Set the rules yourself or let your AI assistant configure them. Heldrey keeps them running automatically.
30 days of Premium · No credit card required · Free plan after trial
Heldrey works on top of Google Calendar. Google Calendar stays your calendar.
Heldrey rule · 01
EnabledClient meetings
WhenAn event is created or changes
IfAt least one attendee is outside my organization
Do
Set event color to blue
Google Calendar · Work
Result in Google Calendar
Client call10:00–10:45
09:3010:0010:3011:0011:30
Previewed against recent events
What Heldrey does
Set how your calendar should behave.
Rules you can set once. Heldrey keeps applying them whenever matching events are created or change.
Event colors
Automatically apply your chosen colors to matching events.
Meeting buffers
Hold time before or after meetings to prevent back-to-back bookings.
Travel time
Automatically block travel time around in-person meetings.
Calendar Sync
Show personal events as Busy on work without sharing their details.
Pending invitations
Hold the slot while an invitation waits for your response.
Your calendar. Your rules.
Set it once. 
Heldrey keeps it that way.
You define the behavior. Heldrey makes it persistent. When an event is created or changes, Heldrey checks the relevant rules and applies the configured actions automatically.
No need to remember.No need to ask again.No need for an AI assistant to keep watching.
Heldrey rulePersistent
Event createdEvent changesRule applies
Configure through MCP
Let your AI assistant set the rules. Then let it move on.
Your assistant is good at understanding what you mean. It shouldn’t need to keep inspecting your calendar and repeating the same deterministic work.
Through MCP, an AI assistant can create, inspect, test and manage your Heldrey rules. After that, Heldrey keeps them running on its own.
Configuration
Human intent“Make client meetings blue and add 15 minutes afterward.”
AI assistantInterprets the preference
MCPCreates the automation
Heldrey ruleStores the persistent configuration
Assistant can move on
Ongoing execution
HeldreyRuns deterministically
System of recordGoogle Calendar
Prefer to configure things yourself? The same rules are available through Heldrey’s visual rule builder. See the rule builder →
The no-AI for AI
No AI inside.
That’s the point.
AI is excellent at understanding human intent. Heldrey is excellent at reliably repeating deterministic behavior. Your assistant can configure the rule, then Heldrey runs it without requiring AI in the ongoing execution loop.
Explainable
Every change can be traced back to the rule that caused it.
Efficient
Recurring behavior doesn’t require another prompt or model call.
Use AI to understand the rule. Use Heldrey to run it.
Control before and after automation
Automation without surprises.
Preview what a rule will do, see why a change happened, undo reversible actions, and review anything that requires human judgment.
Preview before you enable
See what a rule will do before it starts changing your calendar.
Know why something happened
Activity history shows what Heldrey changed and which rule caused it.
Undo when it’s safe
Reversible actions can be restored without manually repairing your calendar.
Judgment stays with you
If something cannot be handled deterministically, Heldrey doesn’t guess. It goes to Needs Attention.
Powerful enough to automate your calendar.
Predictable enough to trust with it.
A quiet product by design
You shouldn’t need to open Heldrey every day. That’s the goal.
When you do, you can see exactly what Heldrey has been doing for you.
Team
Share the plan. Not your calendar.
Bring up to five included users together on one plan and share reusable automation templates — without giving the Team admin access to members’ calendar content.
Connect work and personal calendars without turning them into company data.
Team admins can manageMembersSeatsInvitationsShared templates
Private boundary
Team admins cannot seeCalendar eventsEvent descriptionsAttendeesPersonal rulesPersonal ActivityPersonal Needs Attention items
Plans
Start with the calendar behavior you need.
Free
$03 active automationsProductive
$15/ month, billed $180 annuallyTeam
$50/ month, billed $600 annually · Up to 5 usersEnterprise
Contact usEnterprise30 days of Premium · No credit card required · Free plan after trial
Compare plans →Resources
Practical ideas for better calendar automation.
Google Calendar
Explore all resources →How to automatically color Google Calendar events
Google Calendar now supports custom colors, but not automatic color rules.
Meeting buffersHow to add buffer time between meetings in Google Calendar
Speedy meetings, appointment buffers and Focus Time — and why none of them protect time after a meeting someone else scheduled.
Travel timeDoes Google Calendar have travel time? How to make it automatic
Google Calendar can add travel time from Maps, but it can’t automatically protect travel around every meeting.
Calendar SyncHow to show personal events as Busy on your work Google Calendar
Keep personal and work calendars separate while still blocking your work availability.
Google Calendar automation
Set the rules once.
Heldrey keeps your Google Calendar behaving the way you want — whether you configure it yourself or let your AI assistant do it for you.
Start free30 days of Premium · No credit card required · Free plan after trial