C 
Customer.io
Behavioural messaging across email, push, SMS and in-app.
NOT REALLY
why this verdict
Keep paying — OpenAI has not replaced it
OpenAI's version overlaps, but does not finish the email job, so this one still earns its $100/mo.
- A named launch, not a vibe named, unlinked
- AI writes the messages but not the behavioural triggers. OpenAI, March 1, 2025 — no announcement link recorded yet.
- How much of the job it covers not the job editorial call
- Parts of it. The job still needs the tool to get finished.
- Is there a free way to do it? yes
- 1 of 3 listed replacements have a usable free tier: Klaviyo.
- What the call is worth $1,200/yr
- $100/mo at the entry paid tier — $1,200 a year per seat.
Reason composed from the fields above missing: announcement linked recorded: free replacement listed recorded: two or more escape hatches
- Threatened by
- OpenAI
- Since
- March 1, 2025
- List price
- $100/mo
- Per year
- $1,200
The backstory
Customer.io is a workflow engine attached to your event stream: if a user did this and not that within seven days, send the following. Models draft the copy inside it, which is an assist. The data pipeline and the branching logic are the product.
Escape hatches
L 
Loops Simpler, cheaper for small SaaS.
loops.so open_in_new B 
Braze Enterprise equivalent.
braze.com open_in_new K 
Klaviyo Better for ecommerce.
klaviyo.com open_in_new1 of 3 replacements have a usable free tier.