comparison · standalone vs GHL-first
Stammer vs Assistable in 2026: Pricing, Features, and the GHL Integration Question
By builders, for builders.
Stammer and Assistable are the two agency-focused voice AI wrappers most often compared by operators who already passed on Voicerr post-hike and want a cleaner-priced agency tier in 2026. Both are orchestration and multi-tenant layers on top of Vapi and Retell. Both ship white-label sub-accounts, client-side billing, and agency dashboards. The real decision point between them is whether your client stack runs on GoHighLevel. Assistable was built from day one as the voice AI layer for GHL agencies, with native conversation sync and sub-account provisioning that mirrors GHL location structure. Stammer is more standalone-first, treating GHL as one integration target among many. For flat monthly cost the two land within $100 to $200 per month of each other at the agency tier. For feature depth in a GHL-native stack, Assistable wins. For standalone agencies that do not live inside GHL, Stammer is the cleaner default.
Side-by-side comparison
| Capability | Stammer | Assistable |
|---|---|---|
| Pricing model | Monthly tiers + usage | Monthly tiers + usage |
| Agency tier entry | ~$397/mo | ~$297 to $497/mo |
| Per-minute overage | ~$0.18 to $0.30 | ~$0.18 to $0.30 |
| GHL integration depth | Good, one of many | Native, GHL-first |
| Standalone CRM | Basic contacts + campaigns | Light, relies on GHL |
| White-label sub-accounts | Yes, polished standalone | Yes, GHL-aware |
| Multi-tenant client billing | Yes, agency tier | Yes, agency tier |
| Voice models in catalog | Vapi/Retell pass-through | Vapi/Retell pass-through |
| Latency posture | Inherited from upstream | Inherited from upstream |
| Integrations breadth | Wider, native + Zapier | Narrower, GHL-centric + Zapier |
| Agency-friendly out of box | Yes | Yes, especially for GHL agencies |
| Compliance certs | SOC 2 in progress | Inherits GHL posture |
| Upstream-risk exposure | High (wrapper) | High (wrapper) |
Best for: Stammer
Pick Stammer if your agency does not live inside GoHighLevel, you want a cleaner standalone product experience for clients, and you want the white-label setup to feel like its own brand rather than a GHL extension. Stammer is the better default for agencies selling voice AI as a distinct service line to non-GHL clients, or for operators who want flexibility to add or remove integrations over time without restructuring the platform. See the Stammer site for current pricing and feature list.
Best for: Assistable
Pick Assistable if your existing agency infrastructure already runs on GoHighLevel, your clients are inside GHL sub-accounts, and you want the voice AI layer to feel like a native extension of the GHL workflow rather than a separate platform. Assistable is the fastest path to a working GHL-aligned voice deployment for marketing agencies adding voice as a service line. The tradeoff is that you inherit GHL's structural decisions for white-label, account hierarchy, and reporting, which can feel constraining if you outgrow that mental model later. See the Assistable site for current pricing.
Where Hermes fits if you outgrew both
Hermes is the operating layer for AI voice agencies, not a wrapper on top of someone else's voice infrastructure pricing. We control upstream economics, sign provider contracts directly, and publish flat $0.24 per minute overage that does not move when an upstream vendor changes their rate card. We include a native CRM with pipeline and sequences (not just basic contacts), so the "do I also need GHL on top" question disappears. Pricing slots: Starter at $149 per month for 3 workspaces, Business at $399 for 7, Agency at $699 for 20 with 2,000 included minutes pooled.
| Capability | Stammer agency | Assistable agency | Hermes Agency |
|---|---|---|---|
| Monthly base | ~$397 | ~$297 to $497 | $699 |
| Per-minute overage | ~$0.18 to $0.30 | ~$0.18 to $0.30 | $0.24 flat |
| Workspaces / sub-accounts | Capped by tier | Capped by tier | 20 included |
| Need GHL on top for CRM | Usually | Yes | No, native |
| White-label demo pages | Yes | Yes | CNAME-bound, included |
| Controls own upstream pricing | No | No | Yes |
Related: Voicerr vs Stammer, Hermes vs the Vapi+GHL stack, Hermes vs Synthflow.
FAQ
Is Stammer cheaper than Assistable in 2026?
They are close on flat monthly cost at the agency tier. Stammer's agency entry tier sits around $397 per month, Assistable's around $297 to $497 per month depending on which add-ons you include. The bigger difference is on the GoHighLevel integration: Assistable was built as a GHL-first product, so if your existing client stack runs on GHL the Assistable integration is deeper and the per-client deployment is faster. Stammer's GHL integration is solid but Stammer is more standalone-first. For pure flat cost on the agency tier, Assistable can land slightly cheaper if you do not need every add-on. For a non-GHL stack, Stammer is the cleaner default.
Which has better GoHighLevel integration, Stammer or Assistable?
Assistable. Assistable was designed from day one as the voice AI layer for GoHighLevel agencies, with native conversation sync, sub-account provisioning that mirrors GHL location structure, and webhook plumbing that lines up cleanly with GHL's automation surface. If you already run GHL for client CRM, Assistable is the lower-friction add-on. Stammer's GHL integration exists and works, but Stammer treats GHL as one of several integration targets, not the home base. For agencies whose entire infrastructure already revolves around GHL, the answer is Assistable. For agencies with a mixed or non-GHL stack, Stammer is more flexible.
Which has better white-label and multi-tenant, Stammer or Assistable?
Both ship white-label sub-account features. Stammer's white-label UI is more polished standalone, with cleaner custom domain CNAME flows and agency-branded client portals. Assistable's white-label inherits structure from GHL when paired, which can be either a feature or a constraint depending on how much you want the voice agent UX to feel like a GHL extension versus its own product. For agencies who sell voice AI as a distinct service line, Stammer's white-label tends to feel more like its own product. For agencies who sell voice AI as part of a GHL bundle, Assistable's white-label inheritance is the cleaner story.
Are Stammer and Assistable both wrappers on top of Vapi or Retell?
Yes. Both Stammer and Assistable are agency UI and orchestration layers on top of upstream voice infrastructure, primarily Vapi and Retell. Neither runs its own voice model, telephony stack, or core conversation runtime. That is true of most agency-focused voice AI platforms in 2026, and it is the structural reason wrapper pricing has been volatile (the Voicerr 7-10x hike in Q1 2026 was the most visible example). The wrapper model can absolutely work for agencies, but you do inherit the upstream cost curve and a layer of vendor risk that an operating platform like Hermes avoids by signing provider contracts directly.
Does Hermes replace Stammer or Assistable, or work alongside them?
Hermes is the agency operating layer that includes everything Stammer and Assistable offer (multi-tenant, white-label, agency billing) plus native CRM with pipeline and sequences, transparent flat $0.24 per minute overage that we control, and direct provider contracts so we are not exposed to wrapper upstream risk. Agencies typically choose Hermes instead of Stammer or Assistable, not alongside. If you already have a working deployment on either and your unit economics work, the migration cost may not pencil out today. If you are evaluating from scratch in 2026, Hermes lands cleaner for most sub-30-client agencies.
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