You receive a notification when you reach 80% of your limit. When you hit the limit, new emails queue until the next billing cycle or until you upgrade. Existing flows continue to run for contacts already in a sequence — we do not cut off mid-flow.

No. The free plan requires only an email address. No credit card, no trial expiration. Use it as long as you need.

Yes. Upgrade or downgrade from your billing settings. Upgrades take effect immediately. Downgrades take effect at the end of your current billing period.

An event is any business action you send to Synapse via the API — a signup, a purchase, a page view, a cart addition. Each POST /v1/events call counts as one event. Events trigger flows, update contact properties, and feed your analytics.

Every workspace has two fully isolated environments: test and live. Templates, flows, segments, contacts, events, and analytics are completely separate between them. You build and verify everything in test mode — which sends real emails to verified team addresses — then clone to live with one click when ready. Test/live isolation is included on all plans, including Free.

Yes. Yearly billing gives you 2 months free (pay for 10 months, get 12). You can switch between monthly and yearly billing at any time.

Email, push notifications, web push, and in-app messaging are all live today. Email, push, and in-app ship on every plan including Free; web push is included from Starter up. Push ships with native iOS and Android SDKs, and in-app ships with a themeable browser UI Kit — every channel runs on the same flow engine, template language, and analytics as email. SMS and WhatsApp are available on higher tiers, and follow as discrete announcements.

Neither. Push is part of the platform. Every plan, including Free, ships with push at the same channel surface as email — same flow builder, same NLT template language, same delivery logs, same analytics. The Free tier includes 1,000 active devices and 10,000 pushes per month, scaling on every paid tier. There is no per-channel surcharge and no per-MAU multiplier.

Yours. You upload your own APNs .p8 token-auth key and your own FCM service account JSON in the dashboard. Pushes go out from your Apple Developer team and your Firebase project, carrying your bundle identifier and sender ID — the ones your users already see in their notification settings. Credentials are encrypted at rest with envelope encryption and decrypted only inside the push send worker.

Pricing adjusts automatically based on your location. Visitors from Vietnam see prices in VND. All other visitors see USD. The features and limits are identical regardless of currency.

Priority email support with 4-hour response during business hours (Mon-Fri 9am-6pm SGT). Included on Pro and Business plans. Enterprise customers receive a dedicated account manager and custom SLAs.

Contact our sales team. We can adjust email limits, contact limits, push allocations, and event limits to match your specific volume — without moving you onto a full Enterprise contract.