Quick summary
Customer.io is a messaging platform for product and growth teams. It sends email, push, and SMS messages based on events from your app, such as a signup, a purchase, or an inactive user. Teams that map a lot of user behavior to messages often use it as the center of their lifecycle program.
Ternloop is a newsletter and campaign tool. You write a campaign in the editor, import contacts or sync them by CSV, group them, and send or schedule the message. It focuses on campaigns you write and schedule.
The right tool depends on how your messages are triggered. If you need sends that react to what users do inside a product, Customer.io is built for that. If you send a regular newsletter or announcement to a list, Ternloop covers the core work at a lower cost.
Pricing compare
Customer.io prices by profile count. The comparison page we reviewed lists its Essentials plan at $100 a month for 5,000 profiles, with its Premium plan around $1,000 a month at similar scale. Customer.io also offers a free trial. Its pricing changes and depends on the channels you use, so check its current page before you commit.
Ternloop's plans are shown below.
| Ternloop plan | Monthly price | Annual price | Emails per month | Contacts |
|---|---|---|---|---|
| Free | $0 | $0 | 1,000 | 500 |
| Pro 5,000 | $4 | $46 per year | 5,000 | 3,000 |
| Pro 10,000 | $8 | $92 per year | 10,000 | 6,000 |
| Pro 20,000 | $15 | $172 per year | 20,000 | 12,000 |
| Pro 50,000 | $25 | $286 per year | 50,000 | 30,000 |
| Pro 100,000 | $50 | $570 per year | 100,000 | 50,000 |
| Pro 150,000 | $70 | $810 per year | 150,000 | 80,000 |
For a list of 3,000 contacts, Ternloop's 5,000 email tier costs $4 a month. Customer.io's Essentials plan starts at $100 a month for 5,000 profiles in the comparison we reviewed. The price gap is large, but the products do different work. Customer.io's price covers event tracking, segmentation, and campaigns across several channels.
If your team only needs to send newsletters and announcements, paying for event tracking may not make sense. Ternloop prices by the volume you send and the contacts you store, so the bill stays predictable as the list grows.
Feature compare
| Feature | Ternloop | Customer.io |
|---|---|---|
| Campaign editor | Rich editor and block editor | Drag and drop editor |
| Open and click tracking | Included on every plan | Included |
| Contact groups and fields | Groups, custom fields, and CSV import on Pro | Segments and profile attributes |
| Scheduling | Included on Pro | Included |
| Custom sending domain | Included on Pro | Included |
| Bounce and unsubscribe handling | Automatic, based on SES webhooks | Included |
Customer.io's main strength is messaging driven by events. Your app sends events to the platform, and the platform decides who gets a message next. That lets a product team build onboarding journeys, reactivation flows, and billing reminders. Ternloop is built for campaigns you write and schedule yourself.
Ternloop's strength is simplicity. The free plan gives you a rich editor, open and click tracking, and up to 500 contacts. Pro adds CSV import, scheduling, custom sending domains, and graph stats. When SES reports a bounce, complaint, or unsubscribe, Ternloop marks the contact inactive so that it does not receive future campaigns.
When to choose Ternloop
- You send a newsletter, product update, or announcement to a list on a schedule.
- You do not need messages triggered by events inside the app.
- You want a lower monthly cost and a clear limit on contacts and sends.
- You want scheduling, CSV import, and custom sending domains on one plan.
- You can wait for automations to launch.
When to choose Customer.io
- Your team wants messages triggered by product events, such as signups or purchases.
- You need push or SMS alongside email.
- You have engineers who can send events from your app to the platform.
- Your budget supports a higher price for lifecycle messaging.
The main question is whether your messages depend on user behavior. A growth team with onboarding and retention journeys should evaluate Customer.io closely. A creator or company that sends a regular update to subscribers can keep the workflow and the bill simpler with Ternloop.
Start with Ternloop
You can start on Ternloop's free plan with 1,000 emails and 500 contacts each month. Send a test campaign, review the open and click data, and move up when your list grows. Full plan details are on the pricing page.
Questions to ask before you switch
Start with the trigger. If a message should go out because a user signed up, upgraded, or stopped using a feature, you need event tracking in your product. Customer.io is built for that flow. Ternloop is the better fit for campaigns you schedule yourself, such as a monthly update or a launch announcement.
Next, count your profiles and channels. The comparison we reviewed lists Customer.io's Essentials plan at $100 a month for 5,000 profiles. Ternloop's 5,000 email tier is $4 a month for up to 3,000 contacts. If you only need email, the gap in price is real. If you also need other channels, Customer.io covers more ground, since Ternloop focuses on email.
Then decide who will run the tool. Customer.io asks a product or engineering team to set up events, attributes, and journeys. Ternloop is designed for a founder or marketer who writes a campaign, picks a list, and sends. That difference often matters more than the price.
Finally, plan a test. Send a campaign to a small segment before you move your full list, and check the open and click reports. Ternloop's graph and advanced stats are available on Pro, so use that view to confirm that the numbers match what you expect.
Keep reading
- Ternloop vs Loops compares Ternloop with a platform built for product email.
- Ternloop vs Klaviyo covers email tied to store activity and SMS.
- Ternloop vs Resend looks at a developer email API.
- About Ternloop explains the founder's pricing approach.
- Contact the founder with questions about your messages.