Side-by-side comparison · Sales & Customer Support
Intercom vs Reply.io 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: Online businesses and software companies with a support team that wants an AI agent to take the first pass at every question.
Pick it if: Small sales teams, founders and agencies running cold email and LinkedIn outreach.
Pick it if: Large consumer brands that want an AI agent to handle a big share of their customer conversations end to end.
Intercom scores highest overall, but Reply.io gives you more for your money. Which one is right comes down to what you value most.
Overview
| Attribute | Intercom | Reply.io | Sierra |
|---|---|---|---|
| In one line | Customer support inbox, help centre and chat, with the Fin AI agent answering first. | Cold email and LinkedIn outreach sequences, plus an AI SDR that writes and replies. | Builds and runs AI customer service agents for big brands, across chat, email and phone. |
| Pricing model | Paid | Paid | Paid |
| Starting price | $0.99 per outcome | From $49/user/mo | See website |
| Free plan | No | No | No |
| Works with Claude Code | Yes | Yes | No |
Rating breakdown
Our scores out of 5. The higher bar in each row is highlighted.
| Attribute | Intercom | Reply.io | Sierra |
|---|---|---|---|
| Overall rating | 4.2Winner | 3.7 | 3.9 |
| Ease of useHow quickly someone non-technical gets value from it. | 4.0 | 4.0 | 3.0 |
| FeaturesHow completely it covers its own job, and how well the pieces fit together. | 5.0 | 4.0 | 4.5 |
| Output qualityHow good the results are before you fix them. | 4.5 | 3.5 | 4.5 |
| Value for moneyWhat you get for the price, including the free plan. | 3.0 | 3.5 | 3.0 |
| Speed & reliabilityHow fast it is and how often it falls over. | 4.5 | 3.5 | 4.5 |
Feature comparison
A tick means it does this today. A dash means we haven't checked.
| Attribute | Intercom | Reply.io | Sierra |
|---|---|---|---|
| Access & platform | |||
| Free plan | No | No | No |
| Mobile app | Yes | – | – |
| Desktop app | – | – | – |
| Browser extension | – | Yes | – |
| API access | Yes | Yes | – |
| Teams & business | |||
| Team workspace | Yes | Yes | Yes |
| Enterprise plan or SSO | Yes | – | Yes |
| Connects to other apps | Yes | Yes | Yes |
| Open source or self-hosted | No | No | No |
| AI abilities | |||
| Works with your files | Yes | – | Yes |
| Understands images | Yes | – | – |
| Makes images | No | No | No |
| Makes video | No | No | No |
| Writes code | No | – | – |
| Runs agents or automations | Yes | Yes | Yes |
| Learns your brand or style | Yes | – | Yes |
| Works in many languages | Yes | Yes | Yes |
| Capabilities score | 10/ 17 | 6/ 17 | 7/ 17 |
Pricing
Plans as listed on each vendor's site when we last checked. Confirm before you buy.
| Attribute | Intercom | Reply.io | Sierra |
|---|---|---|---|
| Plans | Fin on its own $0.99 per outcome, monthly minimum Teams happy with their current helpdesk who want the AI agent only. | Email Volume From $49/user/mo billed yearly, or $59 monthly Email-only cold outreach. | EnterpriseOur pick Custom Large companies with high conversation volumes. |
Essential $29/seat/mo, plus $0.99 per Fin outcome Small teams starting out with live chat and an AI agent. | MultichannelOur pick $89/user/mo billed yearly, or $99 monthly Teams running email and LinkedIn together. | ||
AdvancedOur pick $85/seat/mo, plus $0.99 per Fin outcome Growing support teams that need automation and several inboxes. | Jason AI SDR From $500/mo billed yearly Teams wanting AI to run outbound end to end. | ||
Expert $132/seat/mo, plus $0.99 per Fin outcome Larger teams with security and multi-brand needs. | |||
| Which plan to pick | Start the 14-day trial and see how many conversations Fin handles, because that number drives the bill more than seats do. Most teams with more than a couple of agents end up on Advanced for the workflows. If you already run Zendesk or Salesforce and like it, try Fin on its own first. | Multichannel is the best value if you use LinkedIn at all, since the add-ons on Email Volume quickly cost more. Only look at Jason AI SDR once your manual sequences are already booking meetings. | 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 | Intercom | Reply.io | Sierra |
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Pros and cons
| Attribute | Intercom | Reply.io | Sierra |
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Who each one is for
| Attribute | Intercom | Reply.io | Sierra |
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Questions people ask
Which is better, Intercom, Reply.io or Sierra?
Intercom scores highest overall in our ratings (Intercom 4.2/5, Reply.io 3.7/5 and Sierra 3.9/5). Intercom is best for answering common customer questions automatically and website and in-app live chat. Reply.io is best for cold email campaigns and email plus LinkedIn sequences. Sierra is best for high-volume customer service at large brands and AI phone agents that take real actions.
Which is cheaper, Intercom, Reply.io or Sierra?
Intercom: There's no free plan. Paid plans start at $0.99 per outcome. Reply.io: There's no free plan. Paid plans start at From $49/user/mo. 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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