Best SMS Marketing Apps for Shopify (2026): Real Per-Message Costs
Omnisend, Postscript, Klaviyo and Shopify Messaging compared on what a US text message actually costs, monthly fees and who each one suits.
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SMS pricing is where store owners get surprised: monthly minimums, carrier fees, and the fact that one long text can be billed as two messages. Here’s what each option costs per US message, from each vendor’s own pricing page (checked October 20, 2026).
US SMS costs compared
| App | Monthly fee | Per US SMS | Extra fees / notes |
|---|---|---|---|
| Omnisend | Any plan (Free $0, Standard from $16, Pro from $59) | $0.009 → $0.007 by credit volume | Pro includes SMS credits equal to your bill |
| Postscript Starter | $0 | $0.009 (MMS $0.045) | $49 monthly minimum spend; carrier fees extra ($0.0033/SMS US & Canada) |
| Postscript Growth | $100 | $0.008 (MMS $0.03) | Carrier fees extra |
| Postscript Professional | $500 | $0.007 (MMS $0.024) | Carrier fees extra |
| Klaviyo | Email plan from $20 (free plan includes $5 of mobile messages) | From $0.01 | Plus carrier fees |
| Shopify Messaging | None | $0.012 | $2.15/month per toll-free number; confirmations and keyword replies are billed too |
1. Omnisend – best if you want email and SMS in one tool
Omnisend runs email, SMS and web push in the same automation builder, so an abandoned-cart flow can send an email first and a text later. SMS is pay-as-you-go on every plan, with published US rates falling from $0.009 to $0.007 per message as you buy more credits. On Pro (from $59/month), you get bonus SMS credits equal to your monthly bill. Support is 24/7 on every plan.
Omnisend
Best overallBest for: Stores that want email and SMS automations in one place
- Low per-message rates
- Email, SMS and push in one flow
- 24/7 support
- Fewer SMS-specific features than an SMS-first platform
2. Postscript – best SMS-first platform
Postscript is built specifically for Shopify text marketing and is rated 4.6/5 from 1,205 reviews on the Shopify App Store. Pricing is transparent: the Starter plan has no monthly fee but a $49 minimum spend, then $0.009 per SMS; larger plans lower the per-message rate in exchange for a monthly fee. Carrier fees are added on top, and plans start with a 30-day trial and a $100 credit. It’s the stronger choice when SMS is a main revenue channel.
Postscript
Best for: Brands where SMS is a primary sales channel
- Built for Shopify SMS
- Clear per-message pricing
- 30-day trial with $100 credit
- $49 monthly minimum on Starter
- Carrier fees on top
- You still need a separate email tool
3. Klaviyo SMS – best if you already use Klaviyo
If Klaviyo runs your email, adding SMS keeps everything in one profile. Texts are billed per send from $0.01 plus carrier fees, and the free plan includes $5 of mobile messages a month to try it.
4. Shopify Messaging – simplest setup
Shopify’s own app sends SMS at $0.012 per US message, billed on your Shopify invoice. Watch the extras: each approved toll-free number costs $2.15 a month, and automated messages such as subscription confirmations are billed too. Good for testing SMS; dedicated tools are cheaper per message at volume.
Tips to keep SMS costs down
- Keep messages short – a text that splits into two segments is billed twice.
- Use SMS for high-intent moments (abandoned cart, shipping updates, VIP offers), not every campaign.
- Only text people who explicitly opted in to SMS – it’s required, and it keeps unsubscribes low.
Need email too? See the best email marketing tools for Shopify.