Side-by-side comparison · Sales & Customer Support
Hiver vs Hyperbound vs Sierra
Everything that matters when choosing between them, in one place: our rating, what each can do, what they cost, and the trade-offs.
Comparing 3 tools, the maximum.
At a glance
Pick it if: Small and mid-sized teams who answer customers or suppliers from a shared Gmail address and want structure without leaving Gmail.
Pick it if: Sales managers and enablement teams onboarding and coaching reps on calls.
Pick it if: Large consumer brands that want an AI agent to handle a big share of their customer conversations end to end.
Hyperbound scores highest overall, but Hiver gives you more for your money. Which one is right comes down to what you value most.
Overview
| Attribute | Hiver | Hyperbound | Sierra |
|---|---|---|---|
| In one line | Shared inbox and helpdesk that runs inside Gmail, with AI that drafts and answers replies. | AI sales role-play: practise cold calls and objections with realistic AI buyers. | Builds and runs AI customer service agents for big brands, across chat, email and phone. |
| Pricing model | Paid | Freemium | Paid |
| Starting price | $25/user/mo | Free | See website |
| Free plan | No | Yes | No |
| Works with Claude Code | Yes | No | No |
Rating breakdown
Our scores out of 5. The higher bar in each row is highlighted.
| Attribute | Hiver | Hyperbound | Sierra |
|---|---|---|---|
| Overall rating | 3.9 | 4.1Winner | 3.9 |
| Ease of useHow quickly someone non-technical gets value from it. | 4.5 | 4.5 | 3.0 |
| FeaturesHow completely it covers its own job, and how well the pieces fit together. | 4.0 | 4.0 | 4.5 |
| Output qualityHow good the results are before you fix them. | 3.5 | 4.5 | 4.5 |
| Value for moneyWhat you get for the price, including the free plan. | 4.0 | 3.5 | 3.0 |
| Speed & reliabilityHow fast it is and how often it falls over. | 3.5 | 4.0 | 4.5 |
Feature comparison
A tick means it does this today. A dash means we haven't checked.
| Attribute | Hiver | Hyperbound | Sierra |
|---|---|---|---|
| Access & platform | |||
| Free plan | No | Yes | No |
| Mobile app | Yes | – | – |
| Desktop app | – | – | – |
| Browser extension | Yes | Yes | – |
| API access | Yes | – | – |
| Teams & business | |||
| Team workspace | Yes | Yes | Yes |
| Enterprise plan or SSO | Yes | Yes | Yes |
| Connects to other apps | Yes | Yes | Yes |
| Open source or self-hosted | No | No | No |
| AI abilities | |||
| Works with your files | – | – | Yes |
| Understands images | – | – | – |
| Makes images | No | No | No |
| Makes video | No | No | No |
| Writes code | No | No | – |
| Runs agents or automations | Yes | Yes | Yes |
| Learns your brand or style | – | – | Yes |
| Works in many languages | – | – | Yes |
| Capabilities score | 7/ 17 | 6/ 17 | 7/ 17 |
Pricing
Plans as listed on each vendor's site when we last checked. Confirm before you buy.
| Attribute | Hiver | Hyperbound | Sierra |
|---|---|---|---|
| Plans | Growth $25/user/mo billed yearly, or $35 monthly Small teams running one or two shared inboxes. | Free Free Trying AI role-play with a few reps. | EnterpriseOur pick Custom Large companies with high conversation volumes. |
ProOur pick $55/user/mo billed yearly, or $65 monthly Support teams that need targets and connected tools. | PracticeOur pick Custom per user Teams that want reps rehearsing on AI. | ||
Elite $85/user/mo billed yearly, or $95 monthly Larger teams wanting AI quality checks and tighter security. | Perform Custom per user Teams that also want real calls scored and coached. | ||
| Which plan to pick | Growth is enough for a small team that just needs a tidy shared inbox with AI help. Choose Pro if you need response-time targets, CRM or Shopify data next to each email, or the API. Voice is an add-on at $30 per seat. | Run the free role-plays with two or three reps first. If they keep using them, Practice covers rehearsal; only pay for Perform if you do not already have Gong or another call recorder. | There is one route: talk to Sierra's sales team. Agree clearly what counts as an outcome you pay for, and what setup and services cost, before you sign. |
Key features
| Attribute | Hiver | Hyperbound | Sierra |
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Pros and cons
| Attribute | Hiver | Hyperbound | Sierra |
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Who each one is for
| Attribute | Hiver | Hyperbound | Sierra |
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Questions people ask
Which is better, Hiver, Hyperbound or Sierra?
Hyperbound scores highest overall in our ratings (Hiver 3.9/5, Hyperbound 4.1/5 and Sierra 3.9/5). Hiver is best for running support@ or info@ as a team and assigning and tracking customer emails. Hyperbound is best for practising cold calls before going live and onboarding new sales reps faster. Sierra is best for high-volume customer service at large brands and AI phone agents that take real actions.
Which is cheaper, Hiver, Hyperbound or Sierra?
Hiver: There's no free plan. Paid plans start at $25/user/mo. Hyperbound: It's free to use. Sierra: Pricing isn't published; check the vendor's site for a quote.
How we compare
Ratings are our own, from using each tool, across ease of use, features, output quality, value for money, speed & reliability.
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