Side by side
| Hyperbound | Big Sister | |
|---|---|---|
| What it is | AI sales roleplay and coaching platform | Your company's sales brain: scores conversations against your sales method |
| Starting point | Practice with realistic AI buyers built around your sales process | Real calls and meetings from the recorders and phone systems you already use |
| Roleplay | AI roleplays. The free plan includes 45 prebuilt roleplays | Replay coach: a rep replays a weak moment from a real call by voice with an AI version of the buyer. Replay scores never change the Sales Score |
| Real call scoring | Real call scoring with custom AI scorecards, on the Perform plan | Every connected call: 18 skills scored 1 to 5, one 0-100 Sales Score per conversation, rep and team |
| Evidence | Scorecard explanations that quote the transcript | Each score links to the moment in the transcript that earned it |
| Disputes | Not described on the pages we read | Any rep can dispute a score, and a person settles it |
| AI agents | Not described on the pages we read | AI agents are scored against the same 18 skills as human reps |
| Recording | Records conversations on the Perform plan, with call capture and integrations | Does not record. Reads Gong, Fireflies, Granola, tl;dv, Fathom, Otter or any source by API key; phone calls from Ringostat (Binotel in beta) |
| Integrations | Salesforce, HubSpot, Slack, Zoom, Gong, Microsoft Teams | Zoho CRM live; Pipedrive, HubSpot and Salesforce coming; read-only Claude connector live |
| Setup | First bot and scorecard in under 10 minutes; personas, modules and real call scoring about two weeks on average | Most sources connect with one API key |
| Pricing | Free plan. Practice and Perform through a demo, no numbers published | Free plan: 5 of your own calls a month, 1 person, no card. Paid plans per scored user, human or AI agent: see pricing |
The real difference: where you start
Hyperbound starts with practice. Reps roleplay against AI buyers built around your personas and sales process, and the Perform plan brings the same scorecards to real calls.
Big Sister starts with the calls your team already had. Every connected call is scored on the same 18 skills, for reps and for AI agents, and the replay coach takes a weak moment from one of those calls and lets the rep try it again against an AI version of that buyer. The practice starts from a call that already happened.
Where each fits better
Hyperbound fits better
The main need is AI roleplay at scale: onboarding, certifications or hiring, with reps practicing before they meet real buyers. Also if your team sells in many languages (Hyperbound lists 25+) or your buyers ask for SOC 2 Type II and ISO 27001, which Hyperbound states on its site.
Big Sister fits better
You already record calls and want every real call scored against one written method, with each score linked to the transcript and a person settling disputes. Also if you put AI agents in front of customers and want them on the same standard as your reps.
What Big Sister is not
Big Sister is not a call recorder, a CRM, a dialer or a forecasting tool, and it does not build roleplay personas from scratch. If roleplay is the job, Hyperbound is built for it.
This page is written by Big Sister AI. Hyperbound facts come from hyperbound.ai, read on November 9, 2026. Corrections are welcome at hello@big-sister.ai.
FAQ
What is the difference between Big Sister and Hyperbound?
Hyperbound starts from AI roleplay and adds real call scoring on its Perform plan. Big Sister starts from the real calls you already record, scores each one on 18 skills for reps and AI agents, and offers a replay coach for practicing a moment from a real call.
Does Big Sister do AI roleplay?
In one form. The replay coach lets a rep replay a weak moment from a real call by voice with an AI version of the buyer, then scores each skill again. Replay scores stay with the rep and their manager and never change the Sales Score. For roleplay built around personas from scratch, Hyperbound is built for that.
Does Hyperbound record calls?
According to its website, the Perform plan records and scores real conversations and includes call capture and integrations. Big Sister does not record; it reads recordings from tools you already use.
Which one can I try for free?
Both. As of November 9, 2026, Hyperbound has a free plan with 45 prebuilt roleplays and prebuilt example scorecards. Big Sister's free plan scores 5 of your own calls a month for one person, with no card.
Are AI agents scored too?
Big Sister scores human reps and AI agents against the same 18-skill standard. The Hyperbound pages we read do not describe scoring AI agents.