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Twilio is the best-known SMS API — it pioneered the space and has the deepest ecosystem. But it was built for large enterprise customers, and its pricing reflects that. For the majority of businesses sending tens or hundreds of thousands of messages per month, Twilio's per-segment rate plus mandatory carrier surcharges adds up to significantly more than the alternatives.
ReadySMS was built specifically for high-volume A2P SMS at the lowest cost possible. Same Tier-1 US carrier networks as Twilio. Same 10DLC compliance. A similar REST API that works with any existing integration. Rates start at $0.0064/segment — with no carrier surcharges on top — and scale down to $0.0028/segment at enterprise volumes. For a business sending 100,000 messages per month, that difference is over $500.
Twilio Pricing: Base Rate + Carrier Surcharges
Twilio's published rate for outbound A2P SMS is $0.0079 per segment. But that is not the all-in cost. Twilio adds carrier surcharges on top of the base rate for A2P 10DLC messaging:
- Base rate: $0.0079/segment
- Carrier surcharge (A2P 10DLC): ~$0.003/segment
- Effective total: ~$0.0109/segment outbound
Carrier surcharges are pass-through fees from T-Mobile, AT&T, and Verizon for 10DLC-registered A2P messaging. They are not optional — all 10DLC A2P messages on Twilio incur them. On top of that, Twilio charges a phone number rental fee ($1.15/month) and 10DLC campaign registration fees.
ReadySMS does not charge separate carrier surcharges. The rate you see is the all-in cost per segment. Phone numbers start at $5/month with 10DLC registration included in the setup process.
Cost Comparison at Different Volumes
The table below compares monthly SMS costs between Twilio and ReadySMS. Twilio costs include the $0.003/segment carrier surcharge; ReadySMS costs are all-in with no surcharges.
| Monthly Volume | Twilio (~$0.0109/seg) | ReadySMS | Your Savings |
|---|---|---|---|
| 10,000 messages | ~$109 | $64 (Starter) | ~$45 (41%) |
| 25,000 messages | ~$273 | $160 (Starter) | ~$113 (41%) |
| 50,000 messages | ~$545 | $260 (Growth) | ~$285 (52%) |
| 100,000 messages | ~$1,090 | $470 (Growth) | ~$620 (57%) |
| 250,000 messages | ~$2,725 | $1,025 (Professional) | ~$1,700 (62%) |
| 1,000,000 messages | ~$9,500 (w/ vol discount) | $2,800 (Enterprise) | ~$6,700 (71%) |
ReadySMS pricing tiers: Starter $0.0064/seg (0–10K/mo), Growth $0.0052/seg (10K–50K/mo), Professional $0.0041/seg (50K–250K/mo), Business $0.0034/seg (250K–1M/mo), Enterprise $0.0028/seg (1M+/mo). No surcharges, no subscription fee at any tier.
Feature Comparison
| Feature | Twilio | ReadySMS |
|---|---|---|
| Price per segment | $0.0079 base + surcharges | From $0.0064 (all-in) |
| Carrier surcharges | ~$0.003/segment extra | None |
| Free trial | Trial credit only (limited) | 2,500 free messages |
| GoHighLevel integration | Manual API setup required | Native marketplace integration |
| 10DLC registration | Supported (separate portal) | Built-in dashboard, 1–3 days |
| REST API | Yes (comprehensive) | Yes |
| Delivery webhooks | Yes | Yes |
| Web dashboard | Yes (complex) | Yes (simple, purpose-built for SMS) |
| Bulk SMS campaigns | Requires custom code | Built-in campaign manager |
| Two-way inbox | Requires custom code | Built-in conversations inbox |
| Phone number rental | $1.15/month | $5/month (includes 10DLC) |
| Contract required | None (pay-as-you-go) | None (pay-as-you-go) |
| Carrier networks | T-Mobile, AT&T, Verizon (Tier-1) | T-Mobile, AT&T, Verizon (Tier-1) |
Where Twilio Shines
Twilio is the right choice in specific scenarios:
- Complex programmable communications — Twilio has full voice, video, email, WhatsApp, and chat APIs in addition to SMS. If you are building a multi-channel customer engagement platform from scratch, Twilio's breadth is unmatched.
- Huge developer ecosystem — Years of documentation, community tutorials, pre-built helper libraries for every language, and a large pool of developers who know Twilio's APIs.
- Toll-free and short code — Twilio has excellent support for toll-free numbers and dedicated short codes. ReadySMS focuses on 10DLC long-code SMS.
- Enterprise SLA agreements — For Fortune 500 companies that need contractual uptime guarantees and dedicated account managers, Twilio can provide that.
If you are building voice calls, WhatsApp messaging, email, or a complex omni-channel product, Twilio is still the strongest option. ReadySMS is purpose-built for A2P SMS only.
Where ReadySMS Wins
ReadySMS is the better choice in the most common use case: sending a lot of A2P SMS and wanting to keep costs down.
- Cost — No carrier surcharges, lower base rates, deeper volume discounts. At 100K messages/month, ReadySMS saves over $600 compared to Twilio.
- GoHighLevel agencies — ReadySMS has a native GHL marketplace integration. Twilio requires custom API configuration that most non-technical GHL users cannot set up. ReadySMS connects in minutes from the GHL settings panel.
- No-code dashboard — ReadySMS includes a built-in campaign manager, two-way conversations inbox, and contact management. Twilio requires you to build these interfaces yourself or use a third-party tool.
- Simpler 10DLC — ReadySMS handles 10DLC brand and campaign registration inside the dashboard with 1–3 day approval. Twilio routes 10DLC through The Campaign Registry with a more manual process.
- Pay-per-use at any volume — ReadySMS has no minimum monthly spend. Send 500 messages or 5 million — you pay only for what you send.
How to Switch from Twilio
Migrating from Twilio to ReadySMS is straightforward. The ReadySMS REST API follows the same request/response pattern as Twilio's Messaging API, so most integrations need only an endpoint and credential update.
- Sign up at app.readysms.io/signup — free, no credit card, 2,500 messages included.
- Register 10DLC — complete brand and campaign registration in the ReadySMS dashboard ($10 brand + $20 campaign setup, both one-time fees). Approval takes 1–3 business days.
- Update your API integration — swap the Twilio API endpoint and credentials for ReadySMS. The request format is similar: a POST with your from number, to number, and message body.
- Port your number (optional) — if you want to keep the same phone number, ReadySMS supports number porting. This typically takes 5–10 business days.
- Test and go live — send a few test messages to confirm delivery, then update your production configuration.
For GoHighLevel users, there is no API code to write at all. Install the ReadySMS integration from the GHL marketplace, connect your account, and your SMS traffic routes through ReadySMS automatically.
Other Twilio Alternatives
ReadySMS is not the only Twilio alternative worth considering, depending on your use case:
- Vonage (Nexmo) — Enterprise CPaaS, similar pricing to Twilio, strong in voice and international SMS.
- Plivo — Developer-focused SMS API, competitive pricing, similar REST API pattern to Twilio.
- Bandwidth — Carrier-grade API, primarily for large enterprises, aggressive volume pricing.
- LeadConnector (LC Phone) — Built into GoHighLevel, but charges $0.0158/segment — the most expensive option for GHL users.
For pure A2P SMS at the lowest cost with GoHighLevel compatibility, ReadySMS offers the strongest combination of price, ease of use, and native integrations.