Billing & Plans

Synapse offers five plans to fit teams of different sizes. Each plan includes different limits for emails, contacts, team members, API keys, and flows.

Note

Billing is only accessible to the workspace Owner. Other roles cannot view or modify billing settings.

Plans Comparison

Feature	Free	Starter	Pro	Growth	Enterprise
Monthly Price	$0	$49	$149	$299	Custom
Monthly Emails	1,000	10,000	50,000	100,000	Unlimited
Contacts	1,000	10,000	50,000	100,000	Unlimited
Team Members	2	3	5	15	Unlimited
Active Flows	5	25	Unlimited	Unlimited	Unlimited
API Keys	3	10	15	25	Unlimited
Monthly Events	10,000	100,000	500,000	1,000,000	Unlimited
Data Retention	60 days	90 days	1 year	1 year	Unlimited
Custom Sender Domain	--	Yes	Yes	Yes	Yes
Priority Support	--	--	--	Yes (4hr response)	Yes

Note

Pricing is shown in USD. For customers in Vietnam, pricing is displayed in VND (detected automatically via your location). Yearly billing gives you 2 months free (10x monthly price instead of 12x).

Plan Limits

Each plan enforces limits across several dimensions:

Limit	What Happens When Reached
Monthly Emails	No more emails can be sent until the next billing cycle. Flows will still trigger but email steps will fail.
Contacts	New contacts cannot be created. Events for existing contacts still work.
Team Members	New invitations are blocked until a member is removed or the plan is upgraded.
API Keys	New API keys cannot be created until an existing key is revoked or the plan is upgraded.
Active Flows	New flows cannot be activated (but can be saved as draft) until an existing flow is archived or the plan is upgraded.
Monthly Events	New events are rejected with a `403 plan_limit_reached` error. Existing flows and scheduled emails are not affected.
Data Retention	Events older than the retention period are automatically purged.

When you hit a limit, the dashboard shows a clear message with your current usage and a link to upgrade.

Warning

Email limits reset at the start of each billing cycle. If you run out mid-month, upgrading your plan takes effect immediately and gives you the new limit right away.

Viewing Your Current Usage

Go to Settings > Billing (Owner only).
The billing page shows:
- Your current plan name
- Usage progress bars for each limit (color-coded: green under 50%, yellow at 50-80%, red at 80-100%)
- Billing cycle dates
- Next payment date and amount

Upgrading Your Plan

Go to Settings > Billing.
Click Change Plan or Upgrade.
A comparison modal shows all plans with your current one highlighted.
Select the plan you want to upgrade to.
You'll be redirected to a secure checkout page to enter payment details.
After payment, your new plan and limits take effect immediately.

What Happens When You Upgrade

New limits take effect right away.
Your monthly email counter is not reset -- it carries over to the new plan.
You're charged the new plan rate starting from the upgrade date.
If you upgrade mid-cycle, you're charged a prorated amount for the remaining days.

Downgrading Your Plan

Go to Settings > Billing.
Click Change Plan.
Select a lower-tier plan.
The downgrade takes effect at the end of your current billing cycle.

What Happens When You Downgrade

You keep your current plan until the end of the billing period.
At the start of the next cycle, the lower plan and its limits apply.
If you have more contacts, flows, or members than the new plan allows, you'll need to reduce them before the downgrade takes effect. Synapse will warn you about this.

Note

If you downgrade to Free, existing flows above the limit will be paused (not deleted). You can reactivate them if you upgrade again later.

Payment Method

Your billing page shows your current payment method (card brand and last four digits) when you have an active subscription. To update your payment method:

Go to Settings > Billing.
In the subscription details section, click the Update Payment Method link.
You will be redirected to a secure Lemon Squeezy page to enter new card details.

Customer Portal

For full self-service billing management, use the Lemon Squeezy customer portal:

Go to Settings > Billing.
Click Manage Billing (or the customer portal link).
The portal lets you:
- Update your payment method
- View and download invoices
- Cancel your subscription

Note

The customer portal is hosted by Lemon Squeezy. Synapse never stores your credit card information.

Pausing Your Subscription

If you need to temporarily stop billing without cancelling:

Go to Settings > Billing.
Click Pause Subscription.
Billing stops immediately, but your current plan and access continue until the end of the billing period.
While paused, no future charges will occur.

Resuming a Paused Subscription

Go to Settings > Billing.
Click Resume Subscription.
Billing resumes and your plan continues as normal.

Note

Only the workspace Owner can pause or resume subscriptions.

Invoices

Go to Settings > Billing.
The invoices section shows all past charges with:
- Date
- Amount (with currency)
- Status (paid, pending, failed)
- Link to view or download the invoice

Failed Payments

If a payment fails:

Lemon Squeezy automatically retries the payment over several days (dunning process).
The workspace Owner receives email notifications from Lemon Squeezy about the failed payment.
Your workspace remains on the current plan during the retry period.
If all retries fail and the subscription expires, the workspace is downgraded to the Free plan with free-tier limits.

Warning

If your subscription expires due to failed payments, your data is preserved but new operations are limited to free-tier levels. Update your payment method via the customer portal to resubscribe.

Enterprise Plan

The Enterprise plan is custom-priced and includes:

Unlimited emails, contacts, members, API keys, and flows
Dedicated sending infrastructure with IP warming
Custom sender domain with full DKIM/SPF management
Priority support with a dedicated account manager
Custom integrations and onboarding assistance

Contact sales for Enterprise pricing.