# What Claude (Anthropic) with web search answered for sms marketing platforms (agencies) on 2026-09-20

## In short

On 2026-09-20, Claude (Anthropic) with web search was asked "best sms marketing platforms for agencies". It named 13 brands; the first six, in order, were Klaviyo, Postscript, Shopify, Attentive, EZ Texting and SlickText.

| Fact | Value |
| --- | --- |
| Question | best sms marketing platforms for agencies |
| Asked on | 2026-09-20 |
| Engine | Claude (Anthropic) with web search |
| Model | claude-opus-5 |
| Brands named | 13 |
| Sources cited | 9 |
| Audience | agencies |
| Coverage | Coverage: Claude (Anthropic) with web search. Other engines not included. |
| Last verified | 2026-09-20 |

Page: https://bikoosh.com/answers/s/sms-marketing-platforms-agencies-2026-09-20
Coverage: Claude (Anthropic) with web search. Other engines not included.

## The answer, as recorded

Asked on 2026-09-20 through Claude (Anthropic) with web search (model claude-opus-5).

> The honest answer is that "best for agencies" splits into three different buckets, and picking the wrong bucket costs you more than picking the wrong vendor. Here's who I'd actually name, in order:
> 
> ## If your clients are ecommerce/DTC brands
> 
> **1. Klaviyo** - My default first recommendation for most agencies. Email and SMS live in the same segments, same flows, same attribution, so you're not reconciling two revenue reports for one client. Their partner program is mature and the agency tooling (client management, portfolio view) is genuinely built for multi-account work rather than bolted on. Roughly $3K-$7K/mo at 100K subscribers per [Arctic Leaf's comparison](https://www.arcticleaf.com/blog/learning-center/klaviyo-attentive-postscript/), which is the middle of the three.
> 
> **2. Postscript** - Better than Klaviyo on the pure-SMS mechanics: deliverability, carrier relationships, and compliance tooling are its actual differentiators, and it's Shopify-native. I'd pick it over Klaviyo when a client is Shopify-only and SMS is the primary channel rather than a supporting one. Downside: you'll likely still run Klaviyo for email alongside it, so it's two bills.
> 
> **3. Attentive** - Only fo

## Brands named, in the order the engine gave

| Position | Brand | How it was named |
|---|---|---|
| 1 | Klaviyo | recommended |
| 2 | Postscript | compared |
| 3 | Shopify | compared |
| 4 | Attentive | mentioned |
| 5 | EZ Texting | mentioned |
| 6 | SlickText | mentioned |
| 7 | Strong | mentioned |
| 8 | Salesmsg | mentioned |
| 9 | GoHighLevel | mentioned |
| 10 | White-label | mentioned |
| 11 | Brevo | mentioned |
| 12 | ProTexting / SMSGlobal / NorthText | mentioned |
| 13 | Twilio | mentioned |

## Sources the engine cited

- https://www.arcticleaf.com/blog/learning-center/klaviyo-attentive-postscript/ (other)
- https://www.eztexting.com/features/managed-accounts (vendor)
- https://www.slicktext.com/blog/2026/08/10dlc-registration-and-tcpa-compliance/ (vendor)
- https://www.perspective.co/article/white-label-marketing-software (other)
- https://www.smsglobal.com/us/white-label-reseller/ (other)
- https://www.salesmessage.com/blog/best-sms-marketing-software (other)
- https://www.bloomreach.com/en/blog/best-sms-marketing-platforms (other)
- https://www.protexting.com/sms-white-label.html (vendor)
- https://www.txtimpact.com/blog/best-sms-platforms-that-handle-10dlc-registration (other)

The question page: https://bikoosh.com/answers/q/sms-marketing-platforms/agencies

Answer Watch records what one AI answer engine said on one date, nothing more. Each page names the engine and the model, carries the date the question was asked, and lists the brands that appeared in the answer in the order the engine gave them, with the sources it cited. It is a measurement, not a ranking, not a recommendation and not a claim about the world. Brands that did not appear in an answer are not named on any public page. Coverage: Claude (Anthropic) with web search. Other engines not included.