Can you give me a list of SMS APIs that support A/B testing? [2025]

When you’re only sending a few hundred texts a day, almost any SMS provider will do. But many businesses don’t live in that world.

Maybe your teams are running OTPs that must hit within seconds. You’re pushing time-sensitive offers to thousands of customers at once. You’re coordinating operations where a delivery delay means lost revenue or reputational damage.

And there’s another catch: sometimes you need A/B testing capibilities. After all, it’s one of the best ways to find out what messaging approaches work best for your audience.

Unfortunately, most SMS APIs don’t have direct A/B testing functionality. However, some SMS APIs have corresponding dashboards that you can use to conduct A/B tests.

In this guide, we’ll break down some of best SMS APIs that support A/B testing to this extent in 2025, evaluated for:

• Throughput capacity (messages per second/minute/hour)
• Delivery reliability (carrier routes, redundancy, latency)
• Compliance readiness (TCPA, GDPR, 10DLC, regional rules)
• Integration and API performance (how easily they sync with your CRM/ERP/workflows)
• Enterprise-grade support and scalability

Can You Give Me a List of SMS APIs that Support A/B testing?

If you want the shortlist of best SMS APIs that support A/B testing via a corresponding ashboard, here’s how the top providers stack up. Mobile Text Alerts comes first for a reason: it balances raw sending power with the kind of general reliability and usability businesses actually need.

*Pricing as of 2025. May vary by volume, region, and throughput commitments.

How to Choose the Right High-Throughput SMS API for A/B Testing

A solid SMS API including A/B testing must keep delivery reliable across regions and stay compliant with carrier rules. When evaluating providers, check for:

Mobile Text Alerts (Best Overall for High-Throughput Enterprise Messaging)

Mobile Text Alerts: Enterprise texting made simple—compliant, scalable, and supported by real people.

Mobile Text Alerts is purpose-built for enterprises that need reliable, large-scale SMS delivery without sacrificing compliance or support. Unlike providers that lean on bots and generic FAQs, Mobile Text Alerts offers direct human assistance—a critical advantage when your campaigns involve millions of messages or regulated communications.

Its platform combines throughput capacity, carrier redundancy, and compliance-first design, making it a strong fit for finance, healthcare, retail, and other industries where failed delivery is not an option.

Standout Features

• Send & Receive SMS via Developer-Friendly API: Send and receive tens of thousands of SMS per second with developer-friendly, API-driven throughput for enterprise traffic.
• Global Reach & Coverage: Send messages to people all over the world.
• Transparent Pricing: Enjoy pricing that flexes to your needs and scales as you do, as low as $.0039 per message.
• Strong Documentation: Solid API documentation that allows developers to implement without a lot of hassle.
• Dedicated Support via Slack: Get live developer support via a dedicated Slack channel for enterprise customers.
• MCP Servers: Take advantage of MCP servers that make integrating SMS easier than ever.
• Two-Way Messaging: Connect with your audience 1-on-1 and receive their responses so your team can continue to engage.
• Clear Verification Timelines and Deliverability Benchmarks: Get clarity with verification and deliverability expectations so you can have confidence that your messages are getting seen.
• White Glove Setup and Migration: Enjoy the white glove treatment as your team gets all the attention and help they need to move forward with setup and migration.
• Reliable Delivery at Scale: Use carrier redundancy and optimized routing to prevent throttling, delays, or dropped messages during peak campaigns.
• Automated Scheduling & Real-Time Tracking: Access delivery receipts, error codes, and engagement metrics instantly to spot failures before they cascade.
• Security & Compliance: Enforce TCPA, 10DLC, and carrier rules with automated opt-in/opt-out management and audit-ready logs.
• Integration with Enterprise Systems: Connect SMS into CRMs, ERPs, and automation tools through RESTful APIs and webhooks.
• iMessage Support: Send via iMessage where SMS faces restrictions or international gaps.

Also Read: 2025 SMS Marketing Benchmarks with Insights from 15 Experts

What Users Say About Mobile Text Alerts

Pros

• Provides real human support to resolve issues faster compared to chatbot-heavy competitors.
• Offers transparent pricing with no hidden carrier surcharges, helping enterprises manage large-scale budgets.
• Delivers strong compliance features that minimize risks of carrier filtering or TCPA violations.
• Scales seamlessly with no limits on users or contacts, supporting enterprises as messaging volume grows.

Cons

• Uses custom, volume-based pricing, which means enterprises must engage with sales, but it ensures tailored rates at scale rather than one-size-fits-all plans.

Pricing

Mobile Text Alerts has pricing options as low as $.0039 per message.

It offers a 14-day free trial so enterprises can validate throughput and compliance before committing. After the trial, pricing moves to custom, volume-based plans with discounted rates for high-scale messaging.

Twilio (Best for Developer-Centric Enterprises and Global Scale)

Twilio: Helps enterprises send at scale with flexible APIs, but setup and costs can weigh heavy.

Twilio is a top choice for enterprises that need a developer-first, highly customizable SMS gateway capable of handling massive volumes worldwide. It’s built for organizations with complex communication needs, offering SMS, MMS, WhatsApp, voice, and email APIs under one programmable platform.

Standout Features

• Scale Messaging Globally: Send SMS, MMS, and multi-channel messages at enterprise volume with Twilio’s programmable APIs.
• Choose Number Types: Use short codes, long codes, or toll-free numbers to match brand identity and compliance requirements.
• Automate Two-Way Communication: Enable interactive messaging, automated responses, and AI-driven conversations with customers.
• Optimize Delivery: Rely on Twilio’s delivery intelligence for routing, queuing, and error handling across carriers worldwide.
• Track Campaign Performance: Access real-time analytics, including delivery insights, heatmaps, and engagement metrics.
• Integrate with Any Tech Stack: Use SDKs, webhooks, and multi-language developer libraries for faster deployment.
• Expand Beyond SMS: Leverage support for WhatsApp, email, RCS, and voice to run true omnichannel campaigns.

What Users Say About Twilio

Pros

• Provides unmatched scalability and global carrier reach.
• Offers developer-first tools and documentation for seamless integration.
• Delivers rich analytics that inform campaign optimization.
• Supports true omnichannel communication beyond SMS.

Cons

• Charges add up quickly, especially for international routes or high-frequency campaigns.
• Support often leans on automation, and many enterprise users report delays reaching a live agent.
• Setup can be complex, making it less friendly for non-technical teams.

Pricing

Pay-as-you-go pricing starts at $0.0083 per US SMS segment, with additional costs for premium routes, short codes, and international messaging. Enterprise plans include volume discounts, but many reviewers note that costs rise steeply without them.

Bird (MessageBird) (Best For Multi-Channel Enterprises)

Bird (MessageBird): Offers enterprise SMS reach with transparent pricing and global coverage.

Bird (formerly MessageBird) combines a global SMS API with native WhatsApp/email/voice under one platform. It’s built for teams that want SMS at scale plus marketing, support, and payments in the same stack, without stitching together multiple vendors.

Standout Features

• Global SMS API: Allows sending SMS to 150+ countries through a single, unified API—no extra markups, country tables available for live rates.
• High Throughput & Reliability: Runs on carrier-grade infrastructure with an uptime target backed by SLA, designed to keep large sends stable across regions.
• Omnichannel Messaging & Integration: Uses the same platform to launch WhatsApp campaigns (templates, buttons, catalogs), email, and two-way voice.
• Compliance & Controls: Provides built-in tools for subscription keywords, compliance keywords, frequency capping, and quiet hours to reduce filtering risk and keep programs audit-friendly.
• Developer Tooling & Automation: Provides docs, SDKs, and webhooks to support event-driven flows.

What Users Say About Bird

Pros

• Puts SMS, WhatsApp, email, and voice in one place—useful if your CRM workflows span channels.
• Practical compliance helpers (quiet hours, frequency caps) reduce manual policy work.

Cons

• Users report blocked/removed campaigns or account terminations and long approval cycles; credits sometimes lost.
• Reports of “buggy” behavior and weeks spent with support before mail/SMS worked, with deliverability issues (email), point to uneven reliability.

Pricing

Pay-as-you-go; per-message SMS pricing varies by destination and is shown in Bird’s country tables. Numbers are billed monthly. No additional markups are advertised; volume discounts and custom plans are available. Check the live pricing pages before budgeting.

Infobip (Best for Global Enterprises with Extreme Volumes)

Infobip: Supports extreme-scale messaging with high delivery rates and 800+ direct carrier links.

Infobip is a major CPaaS platform trusted by banks, retail giants, and global ops teams. It combines SMS, RCS, WhatsApp, email, and voice in one fabric. It emphasizes smart routing, compliance, and integration with data tools so enterprises can orchestrate cross-channel flows under a single platform.

Standout Features

• Global SMS API: Provides local operator routing, fallback paths, and two-way SMS where supported—so you don’t need a different API per country.
• Message Personalization & Segmentation: Allows inserting user attributes into messages, plus dynamic segmentation for better targeting across campaigns.
• Automation & Scheduling: Supports defining workflows, scheduling sends, and trigger-based flows (e.g. birthday, follow-up).
• Two-Way Communication: Enables SMS replies in supported countries using Virtual Long Numbers or local numbers.
• OTP & Authentication Tools: Offers built-in support for 2FA and verified senders to protect against spoofing and fraud.
• Routing Intelligence: Chooses optimal path by cost, quality, and compliance rules across 9,700+ global network connections.

What Users Say About Infobip

Pros

• Provides omnichannel capabilities, blending SMS, WhatsApp, chat apps, email, and voice into one platform.
• Delivers reliable global reach with strong cross-border routing and compliance.
• Simplifies campaign setup with a clean, intuitive dashboard.
• Supports developer integration with well-documented APIs and CRM connectors.
• Tracks performance effectively with delivery receipts, scheduling, and campaign monitoring tools.

Cons

• Responds slowly to support requests, with users reporting delayed ticket handling.
• Creates confusion in failure reporting, offering limited clarity when messages fail or get delayed.
• Blocks accounts or deducts credits inconsistently at times, according to user feedback.
• Charges higher costs at some volume tiers or geographies compared to competitors.

Pricing

Infobip uses a pay-as-you-go model with volume discounts for big senders. The SMS rates depend heavily on the destination country, message length, and sender type (e.g., short code, 10DLC, local numbers). A public example: sending SMS to the U.S. may cost ~$0.0079 per message.

Narrowing the List Down to What Matters

When you strip away the marketing, here’s how these SMS APIs stack up for businesses:

• Twilio → Great developer flexibility, but expect steep learning curves and extra monitoring to manage costs at scale.
• Infobip → Strong omnichannel suites with automation, though contracts are complex, and support often feels enterprise-bureaucratic.
• Bird (MessageBird) → Useful for multichannel engagement, but less consistent on pricing clarity and support.

For businesses that want an SMS API with A/B testing (via a corresponding dashboard) without trading off compliance, cost clarity, or human support, Mobile Text Alerts emerges as the practical choice. It maintains the enterprise-grade scale you’d expect while simplifying setup and providing access to real people when it matters.

However, before committing to long-term contracts or complex builds, test whether an SMS API actually meets your business’s A/B testing needs.

Start a 14-day free trial with Mobile Text Alerts and validate performance on your terms.

FAQs

1: What is a high-throughput SMS API, and how is it different from a standard SMS API?

A high-throughput SMS API is built for enterprises sending millions of messages. Unlike standard gateways, which may cap throughput or rely on grey routes, high-throughput platforms use direct carrier connections, redundancy, and compliance checks to ensure large campaigns deliver quickly and reliably.

2: How do I choose the right SMS API for message templating?

Businesses should look beyond pricing and check for:

• Proven throughput benchmarks (e.g., messages per second)
• Compliance safeguards (TCPA, GDPR, 10DLC, HIPAA, if applicable)
• Direct-to-carrier routing instead of grey routes
• Uptime guarantees and SLAs
• Integration readiness with CRMs and automation platforms

3: Which SMS API is the most reliable for global enterprise businesses?

Providers like Infobip excel at global reach, but they can be complex and costly. Twilio balance scales with flexibility. Mobile Text Alerts is best for businesses that want throughput and compliance without the overhead, offering human support alongside high-volume delivery.

4: Can I test an SMS API before committing to an enterprise contract?

Yes. Mobile Text Alerts offers a 14-day free trial so enterprises can test throughput, compliance features, and integrations before signing. Most global CPaaS providers also provide pay-as-you-go entry points, though advanced features often require enterprise contracts.

Author Bio

Nikita Rohira: Once an engineer, now a content marketer, Nikita Rohira blends curiosity with clarity. She spends her days shaping stories for B2C and B2B tech and her breaks listening as a certified counselor.