This one is a tie, and a good one: both Attentive and Postscript ran the 180 days ending July 2026 at 100% uptime with zero major or critical incidents. If you are choosing between them, reliability is not the differentiator this year; features, pricing, and carrier deliverability are.
The numbers, side by side
| Metric (180 days ending July 2026) | Attentive | Postscript |
|---|---|---|
| Uptime (major/critical incidents) | 100% | 100% |
| StatusBird reliability grade | A+ | A+ |
| Major or critical incidents | 0 | 0 |
| Total downtime | 0 minutes | 0 minutes |
How these numbers are measured: StatusBird checks each service's status every 2 minutes, around the clock. Uptime counts major and critical incidents over the 180 days ending July 2026; brief degraded periods are excluded so chronically noisy status pages do not distort the comparison. Full details on the methodology page.
How reliable is Attentive?
Clean window: no major incidents recorded. Live status and history on the Attentive reliability page.
How reliable is Postscript?
Equally clean. See the Postscript reliability page for current status and history.
If both are reliable, what is there to monitor?
Three things. First, windows change: a clean half-year does not promise a clean Q4, and SMS is disproportionately a Q4 revenue channel. Second, SMS has failure modes a status page understates: carrier filtering and delivery delays can gut a send while the platform reports green. Third, your SMS program depends on more than the SMS platform: your e-commerce platform, checkout, and link infrastructure all sit in the conversion path. The BFCM angle is covered in the BFCM 2026 outage readiness guide.
Start monitoring your stack free with StatusBird: 3 services, no credit card required. Pro is $29/month for all 84 services with SMS, email, Slack, Teams, and Discord alerts within 2 minutes of a status change.