Side-by-side comparison · Sales & Customer Support

Apollo.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.

Best overall

Apollo.io

4.0

From $49/seat/mo

Details Visit

Sierra

3.9

Free to start

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Comparing 2 tools. Add one more if you like.

At a glance

Apollo.io4.0

Best overallBest valueEasiest to use

Pick it if: Founders, small sales teams and marketers who need to find B2B contacts and email them.

Sierra3.9

Pick it if: Large consumer brands that want an AI agent to handle a big share of their customer conversations end to end.

Overview

Attribute	Apollo.io	Sierra
In one line	B2B contact database with emails and phone numbers, plus sequences to reach them.	Builds and runs AI customer service agents for big brands, across chat, email and phone.
Pricing model	Freemium	Paid
Starting price	$49/seat/mo	See website
Free plan	Yes	No
Works with Claude Code	Yes	No

Rating breakdown

Our scores out of 5. The higher bar in each row is highlighted.

Attribute	Apollo.io	Sierra
Overall rating	4.0Winner	3.9
Ease of useHow quickly someone non-technical gets value from it.	4.5	3.0
FeaturesHow completely it covers its own job, and how well the pieces fit together.	4.5	4.5
Output qualityHow good the results are before you fix them.	3.0	4.5
Value for moneyWhat you get for the price, including the free plan.	4.0	3.0
Speed & reliabilityHow fast it is and how often it falls over.	4.0	4.5

Feature comparison

A tick means it does this today. A dash means we haven't checked.

Attribute	Apollo.io	Sierra
Access & platform
Free plan	Yes	No
Mobile app	Yes	–
Desktop app	–	–
Browser extension	Yes	–
API access	Yes	–
Teams & business
Team workspace	Yes	Yes
Enterprise plan or SSO	Yes	Yes
Connects to other apps	Yes	Yes
Open source or self-hosted	No	No
AI abilities
Works with your files	–	Yes
Understands images	–	–
Makes images	No	No
Makes video	No	No
Writes code	–	–
Runs agents or automations	Yes	Yes
Learns your brand or style	–	Yes
Works in many languages	–	Yes
Capabilities score	8/ 17	7/ 17

Pricing

Plans as listed on each vendor's site when we last checked. Confirm before you buy.

Attribute	Apollo.io	Sierra
Plans	Free Free Founders testing outbound.	EnterpriseOur pick Custom Large companies with high conversation volumes.
	Basic $49/seat/mo billed yearly Individual sellers doing regular outbound.
	ProfessionalOur pick $79/seat/mo billed yearly Full-time reps.
	Organization $119/seat/mo billed yearly (min 3 seats) Sales teams wanting advanced controls.
Which plan to pick	Start on Free to check the data covers your market. Basic suits one person prospecting; Professional is worth it if you also call prospects or want AI scoring. Monthly billing costs noticeably more than the yearly prices shown.	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	Apollo.io	Sierra
Standout features	Contact database Email sequences Chrome extension Dialer and call recording AI research and scoring Enrichment	Agent Studio Ghostwriter One agent, every channel Connected to your systems Insights and testing

Pros and cons

Attribute	Apollo.io	Sierra
Pros	Generous free plan for getting started Database and outreach in one tool Much cheaper than ZoomInfo Easy to learn for non-technical users	Agents take real actions, not just answer questions Covers voice as well as chat, SMS, WhatsApp and email Outcome-based pricing means you pay for results, not seats Proven at very large brands
Cons	Bounce rates and out-of-date contacts are common complaints Weaker phone and contact data outside the US Credits run out fast and do not roll over Billing disputes and slow support on lower plans	No public pricing; estimates put it out of reach for most small and mid-sized businesses No trial or self-serve option, so you are committing to a sales process and a project Few independent reviews to check claims against You depend on Sierra's team for much of the build

Who each one is for

Attribute	Apollo.io	Sierra
Best for	Finding business emails and phone numbers Building B2B lead lists Simple cold email sequences Cheaper alternative to ZoomInfo	High-volume customer service at large brands AI phone agents that take real actions Returns, bookings and account changes Saving cancellations and handling retention calls
You'll find it used by	Founders Sales development reps Account executives Marketers Recruiters	Enterprise support teams Contact centres Retail brands Banks and insurers Telcos

Questions people ask

Which is better, Apollo.io or Sierra?

Apollo.io scores highest overall in our ratings (Apollo.io 4.0/5 and Sierra 3.9/5). Apollo.io is best for finding business emails and phone numbers and Building B2B lead lists. Sierra is best for high-volume customer service at large brands and AI phone agents that take real actions.

Which is cheaper, Apollo.io or Sierra?

Apollo.io: There's a free plan, and paid plans start at $49/seat/mo. Sierra: Pricing isn't published; check the vendor's site for a quote.

Which is easier to use, Apollo.io or Sierra?

Apollo.io rates highest for ease of use in our scores. Founders, small sales teams and marketers who need to find B2B contacts and email them.

Ratings are our own, from using each tool, across ease of use, features, output quality, value for money, speed & reliability.

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