Loop Voice vs Synthflow
Synthflow builds voice agents with a no-code designer, runs its own telephony and voice engine, and connects to contact center platforms such as Five9 and Genesys. Its pricing page now lists only Enterprise contracts. Loop Voice is a self-serve product for online stores, with store triggers, texts and order attribution built in.
By Bawar Amadis, CEO · Last checked Oct 28, 2026
The short answer
Synthflow is now a sales-led enterprise platform: its pricing page lists only Enterprise contracts from $30,000 a year, and outbound campaigns sit on that plan. It suits contact centers and agencies that resell voice agents. Loop Voice suits online stores that want checkout, upsell, win-back and support calls, self-serve from $119 a month.
Loop Voice publishes this comparison. Details about Synthflow come from Synthflow's pricing page, docs and integrations page, checked on Oct 28, 2026. Prices and features change, so check the linked pages before you decide.
Four ecommerce jobs, side by side
What each one does out of the box for the four jobs most stores buy voice agents for.
Loop Voice
IncludedCalls from the abandoned-checkout event after the delay you set (10 minutes in the default flow), with the cart in hand. Texts the checkout link, offers only the discount codes you allow and stops when the order comes in.
Synthflow
Build it yourselfCampaigns and event-triggered Workflows can place the calls, but both are Enterprise only. You connect Shopify checkouts and pass the cart in.
Loop Voice
IncludedCalls in the window you set after an order, with one add-on that fits what was bought, such as a refill, a bundle or a warranty.
Synthflow
Build it yourselfPossible with Enterprise Workflows and your own offer logic.
Loop Voice
IncludedCalls customers who haven't ordered in 60, 90 or 180 days (you pick the window), opens with their last order and adapts the comeback offer to what they say.
Synthflow
Build it yourselfEnterprise Campaigns take lists of up to a million recipients with calling windows. Matching calls to new orders is up to you.
Loop Voice
IncludedAnswers 24/7 on the first ring: order status, returns, exchanges, sizing and shipping. What it can't resolve becomes a ticket with the transcript and order attached.
Synthflow
PartialInbound agents and business hours are included. Order lookups need a store connection its docs don't describe.
Feature and price comparison
| Comparison detail | Loop Voice | Synthflow |
|---|---|---|
| What it is | AI calling product for online stores: agents that call shoppers and answer your support line | Voice agent platform for enterprises, contact centers and agencies |
| Built for | Ecommerce and DTC brands that judge calls by revenue and support cost | Contact centers, outsourced call centers and agencies that resell agents |
| Ecommerce jobs ready to run | Abandoned checkout, post-purchase upsell, win-back, review requests, subscriber check-ins and 24/7 inbound support | None ready made; its retail page describes order status, shipping and returns |
| Store data on the call | Carts, orders and products from Shopify, WooCommerce, BigCommerce, Magento, Shopline or Checkout Champ, your site's policies, and the discount codes you allow | Shopify is named on its integrations page with no detail; its docs have no Shopify page |
| SMS | Yes: checkout link and discount code by text during or after calls, with STOP handling | Yes: texts or WhatsApp during and after calls, through Twilio |
| Revenue attribution | Yes: each sale tied to an order number, by flow, campaign and channel | Not built in for store orders |
| Testing and improvement | Simulator with six AI shoppers, A/B tests on revenue per call, and LoopIQ, which proposes one change a week for you to approve | Test Center simulations, custom evaluations and live monitoring; Aurora on Enterprise builds agents and analyzes calls |
| Compliance controls | Do-not-contact list, opt-out by text or voice, frequency caps, quiet hours in each customer's time zone | Recording and transcript controls and PII redaction; AI disclosure is yours to set up; no do-not-call list found |
| Setup | Shopify app, live in under 10 minutes; done-for-you setup on Enterprise | No-code builder; Campaigns and Workflows on Enterprise |
| Pricing model | Monthly plan with credits; about 1.5 credits per answered conversation; unanswered calls are free | Annual Enterprise contract, billed per second |
| Starting price (as listed) | Free plan with 10 credits; paid from $119/month for 120 credits | Enterprise contracts from $30,000 a year |
| Shopify App Store rating | 5.0 (10 reviews) | No listing found |
How each one gets better after launch
Loop Voice
Loop Voice runs the improvement loop for you, scored on store revenue. Agents start from templates for sales, support and abandoned cart, with a prompt score calibrated on real calls and the orders they produced. Before launch, the Simulator plays your agent against six AI shoppers, from a ready buyer to one who suspects it's a robot, and scores each call without dialing anyone. After launch, you can split traffic between two agents and Loop Voice promotes the one with more revenue per call. LoopIQ learns from every call and each week names the one change worth making, such as holding the discount until minute two or calling sooner after checkout, and nothing changes until you approve it.
Synthflow
Synthflow's Test Center runs simulated customers against your agent with pass or fail criteria, custom evaluations score real calls, and Aurora, on Enterprise, builds agents, analyzes calls and runs simulations. Its homepage says agents improve continuously through Auto-QA, but we couldn't find documentation for it. Scoring calls on store revenue would take your own order matching.
When Synthflow is the better pick
- You run a contact center or outsourced call center and need Five9, Genesys or 8x8 integrations.
- You're an agency that wants sub-accounts and white-label branding for clients.
- You need EU hosting or a long certification list, including HIPAA and PCI DSS.
When Loop Voice is the better pick
- You want to start at $119 a month, not a $30,000 annual contract.
- You want abandoned checkout, upsell and win-back calls ready to run on every plan.
- You want each call tied to a Shopify order and an improvement loop scored on revenue per call.
How pricing compares
Synthflow's pricing page lists one plan: Enterprise contracts from $30,000 a year, with rates set by contract. Its billing docs say calls are billed per second, and unanswered calls and calls that reach voicemail are billed a flat 5 seconds. Its older Pro, Growth and Agency plans are no longer sold. Loop Voice publishes its plans: $119 to $3,790 a month for 120 to 6,000 credits.
Frequently asked questions
- Does Synthflow still have self-serve plans?
- Its pricing page lists only Enterprise contracts from $30,000 a year, and its docs say the Pro, Growth and Agency plans are no longer sold. A few older pages on its site still mention pay-as-you-go pricing.
- Does Synthflow integrate with Shopify?
- Shopify appears on its integrations page without detail, and its docs have no Shopify page. Check with Synthflow before you plan on it.
- Is Loop Voice a Synthflow alternative for online stores?
- For store calls, yes. Loop Voice is self-serve from $119 a month and comes with abandoned checkout, upsell, win-back and support calls ready to run.
- Which is better for agencies?
- Synthflow, if you want sub-accounts and white-label tools for many kinds of clients. Loop Voice runs a partner program for agencies that serve online stores.
- How do they compare on testing?
- Both simulate customers before launch. Synthflow scores pass or fail against your criteria. Loop Voice's Simulator uses shopper personas, and its A/B tests and weekly LoopIQ change are judged on revenue per call.
Related comparisons
Loop Voice vs Retell AI
Retell AI sells a voice agent builder by the minute. Loop Voice ships the store calls ready to run, tied to orders.
Loop Voice vs Bland AI
Bland AI runs large custom calling programs. Loop Voice runs checkout, upsell, win-back and support calls for online stores.
Loop Voice vs ElevenLabs
ElevenLabs gives developers voices and agent tools for any business. Loop Voice is a finished store agent that offers ElevenLabs voices.
Sources
- https://synthflow.ai/pricing
- https://docs.synthflow.ai/billing
- https://docs.synthflow.ai/batch-calling
- https://synthflow.ai/integrations
- https://docs.synthflow.ai/simulations
- https://docs.synthflow.ai/security
- https://loopvoice.ai/features
- https://loopvoice.ai/pricing
- https://loopvoice.ai/use-cases/customer-support
- https://apps.shopify.com/loop-voice-agent
- https://loopvoice.ai/customers
- https://loopvoice.ai/benchmarks/2026-09