Amazon SNS vs Twilio
Compare Amazon SNS and Twilio based on observed SMS API performance, features, and pricing
Live performance comparison
Real-world performance data from messages sent through Knock
| Provider | Message volume | Growth | Status page updates (30d) | Status page updates (90d) |
|---|---|---|---|---|
 | 25M–100M | 2nd of 7 → | 0 | 0 |
 | 100M–500M | 1st of 7 → | 25 | 25 |
From January 2nd to April 2nd, Knock routed 25M–100M messages through Amazon SNS and 100M–500M through Twilio. Amazon SNS reported 0 status page updates over the last 90 days, while Twilio reported 25.
Response time
Response time measures how long each provider takes to accept an SMS API request from Knock, including connection overhead and any automatic retries. Lower values mean faster message hand-off.
| Provider | Median (p50) | p90 | p95 | p99 |
|---|---|---|---|---|
| 77ms | 378ms | 778ms | 794ms |
| 74ms | 107ms | 116ms | 139ms |
The chart above shows each provider's daily median response time (p50) from January 2nd to April 2nd. The top-line number is an average of these daily values: Amazon SNS averaged 77ms compared to 74ms for Twilio. Amazon SNS's highest daily p50 was 81ms; Twilio's was 79ms. Both providers deliver comparable response times for the typical request.
The 90th percentile (p90) captures the slowest 10% of requests, revealing how each provider handles moderate stress. Averaged across all days, Amazon SNS has a p90 of 378ms compared to 107ms for Twilio. The highest daily p90 was 772ms for Amazon SNS and 117ms for Twilio. Twilio handles these slower requests 271ms faster, suggesting more consistent performance across the board.
The 99th percentile (p99) represents the long tail — the slowest 1% of requests. Averaged across all days, Amazon SNS reached 794ms at p99 while Twilio reached 139ms. The highest daily p99 was 865ms for Amazon SNS and 192ms for Twilio, indicating the worst-case response time during spikes or provider-side congestion. Twilio shows a tighter tail, which may matter for time-sensitive SMS notifications like one-time passwords or real-time alerts where even rare delays can impact user experience.
Error rate
Error rate tracks the ratio of 5xx responses and timeouts to total SMS API requests. Knock automatically retries failed requests, so transient provider errors rarely affect end-user delivery.
| Provider | Avg. daily error rate | Highest daily rate | Peak error date | Zero-error days | Days above 0.01% |
|---|---|---|---|---|---|
| 0.00% | 0.00% | Jan 2 | 91 | 0 |
| 0.00% | 0.00% | Jan 2 | 91 | 0 |
Averaged across the date range, Amazon SNS shows a 0.00% daily error rate compared to 0.00% for Twilio. The highest single-day error rate was 0.00% for Amazon SNS and 0.00% for Twilio. Both providers show similar reliability levels, with error rates well within acceptable thresholds. Knock automatically retries failed requests to both providers, minimizing the impact of transient errors on end-user delivery.
About these metrics: Data represents messages sent through Knock during the specified period. Response time measures time from Knock to provider acceptance. Error rate includes only provider 5xx responses and timeouts.
Recent Amazon SNS incidents
Recent status page incidents for Amazon SNS
No incidents reported in the last 90 days
Recent Twilio incidents
Recent status page incidents for Twilio
Ongoing since Apr 30, 2026
THIS IS A SCHEDULED EVENT Apr 29, 20:00 PDT - Apr 30, 00:00 PDTMar 12, 00:34 PDT Scheduled - Twilio is conducting a planned maintenance from 29 April 2026 at 20:00 PDT until 30 April 2026 at 00:00 PDT. During the maintenance window, there could be intermittent delays or failures delivering SMS to and from United States and Canada handsets when sending via long codes, short codes and toll free numbers.
Ongoing since Apr 29, 2026
THIS IS A SCHEDULED EVENT Apr 29, 13:00 - 17:00 PDTMar 31, 07:43 PDT Scheduled - The Tele2 network in Russia is conducting a planned maintenance from 29 April 2026 at 13:00 PDT until 29 April 2026 at 17:00 PDT. During the maintenance window, there could be intermittent delays delivering SMS to Tele2 Russia handsets.
Ongoing since Apr 27, 2026
THIS IS A SCHEDULED EVENT Apr 27, 13:00 - 17:00 PDTMar 31, 07:42 PDT Scheduled - The Tele2 network in Russia is conducting a planned maintenance from 27 April 2026 at 13:00 PDT until 27 April 2026 at 17:00 PDT. During the maintenance window, there could be intermittent delays delivering SMS to Tele2 Russia handsets.
Ongoing since Apr 23, 2026
THIS IS A SCHEDULED EVENT Apr 22, 20:00 PDT - Apr 23, 00:00 PDTMar 12, 00:33 PDT Scheduled - Twilio is conducting a planned maintenance from 22 April 2026 at 20:00 PDT until 23 April 2026 at 00:00 PDT. During the maintenance window, there could be intermittent delays or failures delivering SMS to and from United States and Canada handsets when sending via long codes, short codes and toll free numbers.
Ongoing since Apr 22, 2026
THIS IS A SCHEDULED EVENT Apr 22, 13:00 - 17:00 PDTMar 31, 07:42 PDT Scheduled - The Tele2 network in Russia is conducting a planned maintenance from 22 April 2026 at 13:00 PDT until 22 April 2026 at 17:00 PDT. During the maintenance window, there could be intermittent delays delivering SMS to Tele2 Russia handsets.
Pricing comparison
| Provider | Plan | Per message | Monthly cost |
|---|---|---|---|
| Amazon SNS | Pay-as-you-go | $0.007 | $700 |
| Twilio | Pay-as-you-go | $0.0083 | $830 |
Amazon SNS
US outbound SMS costs $0.007 per message. Origination numbers are billed separately. Amazon SNS charges a flat $0.00302 carrier fee per message, regardless of destination carrier.
Twilio
Outbound SMS to US numbers costs $0.0083 per message. Inbound messages are $0.0075 each. Phone numbers start at $1.15/month for local numbers. Carrier surcharges of ~$0.003–$0.005 per message apply on top of the base rate.
US carrier surcharges
All US A2P SMS sent via 10DLC incurs mandatory carrier fees on top of the provider base rate. Most providers pass these through at cost.
| Carrier | Outbound SMS | Inbound SMS |
|---|---|---|
| T-Mobile | $0.0045 | $0.0025 |
| AT&T | $0.003 | $0.003 |
| Verizon | $0.004 | $0.00 |
| US Cellular | $0.005 | $0.00 |
Amazon SNS flat carrier fee. Amazon SNS charges a flat $0.00302 carrier fee per message, regardless of destination carrier. This makes costs more predictable compared to providers that pass through variable per-carrier fees.
Pros and cons
Amazon SNS
Twilio
Pros
- Among the lowest per-message costs for US domestic SMS
- Deep integration with the AWS ecosystem and IAM permissions
- Reliable infrastructure backed by Amazon's global network
- Supports 200+ countries and regions
Pros
- Largest ecosystem of SDKs, tutorials, and community resources for SMS
- Trusted by Airbnb, Uber, and Netflix for mission-critical messaging
- Comprehensive compliance tooling with opt-out management and content filtering
- Supports SMS, MMS, WhatsApp, and voice in a single platform
Cons
- New accounts are sandboxed and require a support request to go to production
- SMS features are a subset of the broader SNS pub/sub service, which can be confusing
- Limited built-in analytics compared to dedicated SMS platforms
Cons
- Per-message pricing can add up at high volumes without committed-use discounts
- Phone number provisioning and compliance setup can be complex for new users
- Support response times vary by plan tier
Frequently asked questions
What is the difference between Amazon SNS and Twilio?
Amazon SNS is a cost-effective SMS service built on AWS infrastructure, ideal for applications already in the AWS ecosystem. Twilio is the most widely adopted cloud communications platform, offering SMS, MMS, voice, and WhatsApp through a unified API. Amazon SNS is best suited for aws-native applications, while Twilio is geared toward full-featured sms at scale.
Which is cheaper, Amazon SNS or Twilio?
US outbound SMS costs $0.007 per message. Origination numbers are billed separately. Amazon SNS charges a flat $0.00302 carrier fee per message, regardless of destination carrier. Outbound SMS to US numbers costs $0.0083 per message. Inbound messages are $0.0075 each. Phone numbers start at $1.15/month for local numbers. Carrier surcharges of ~$0.003–$0.005 per message apply on top of the base rate. The best value depends on your sending volume and destination countries.
Which is faster, Amazon SNS or Twilio?
Based on real-world data from Knock, Amazon SNS has a median SMS API response time (p50) of 77ms compared to 74ms for Twilio.
Which is more reliable, Amazon SNS or Twilio?
From January 2nd to April 2nd, Amazon SNS showed an error rate of 0.00% while Twilio showed 0.00%. Both rates are within acceptable thresholds for production SMS delivery, and Knock automatically retries failed requests to minimize the impact of transient errors.
Which is more popular, Amazon SNS or Twilio?
On the Knock platform, Amazon SNS handled 25M–100M messages from January 2nd to April 2nd compared to 100M–500M for Twilio. Amazon SNS volume has remained stable, while Twilio volume has remained stable.
Can I use both Amazon SNS and Twilio together?
Yes. Knock enables you to integrate multiple SMS providers into a single notification workflow. You can use Amazon SNS and Twilio side by side, route traffic between them, or migrate from one to the other without changing your application code.
What are the main pros and cons of Amazon SNS vs Twilio?
Amazon SNS strengths include among the lowest per-message costs for us domestic sms and deep integration with the aws ecosystem and iam permissions. Twilio strengths include largest ecosystem of sdks, tutorials, and community resources for sms and trusted by airbnb, uber, and netflix for mission-critical messaging. On the other hand, Amazon SNS drawbacks include new accounts are sandboxed and require a support request to go to production, while Twilio drawbacks include per-message pricing can add up at high volumes without committed-use discounts.
Use either provider with Knock
Knock enables you to integrate Amazon SNS, Twilio, or any combination of SMS providers into a single notification workflow. Manage templates, orchestrate cross-channel delivery, and switch providers without changing your code.