Email APIs · side by side
Reply.io vs SparkPost
Compare Reply.io, SparkPost by sending volume, delivery webhooks, inbound email, domain limits and retention.
Email APIs pricing calculator
These providers bill in different units. Each estimate uses its own workload; there is no same-volume price winner.
Reply.io
0
SparkPost
100K
Reply.io
$59 / mo
Email Volume · 0 active contacts
SparkPost
$80 / mo
Growth · 100K emails
Listed USD plan fees and tracked usage only. Unlisted compute, transfer, extras, taxes and contract terms are excluded. Custom or unsupported plan usage is not estimated.
Email APIs overview & pricing
| Email APIs | Reply.io | SparkPost |
|---|---|---|
| Provider | ReplyApp Inc. | Bird |
| Billing unit | active contacts | emails |
| Plan at selected usage | Email Volume | Growth |
| Monthly estimate | $59/mo | $80/mo |
| Workload | 0 active contacts | 100K emails |
| Free access | None (14-day free trial available) | Trial availability varies |
| Published plans | Email Volume, Multichannel, Agency Core, Agency AI SDR, AI SDR Starter, AI SDR Growth, AI SDR Enterprise, Hybrid plan | Free, Startup, Growth, Enterprise |
| Prices checked | 2026-10-08 | 2026-10-08 |
Provider
- Reply.io
- ReplyApp Inc.
- SparkPost
- Bird
Billing unit
- Reply.io
- active contacts
- SparkPost
- emails
Plan at selected usage
- Reply.io
- Email Volume
- SparkPost
- Growth
Monthly estimate
- Reply.io
- $59/mo
- SparkPost
- $80/mo
Workload
- Reply.io
- 0 active contacts
- SparkPost
- 100K emails
Free access
- Reply.io
- None (14-day free trial available)
- SparkPost
- Trial availability varies
Published plans
- Reply.io
- Email Volume, Multichannel, Agency Core, Agency AI SDR, AI SDR Starter, AI SDR Growth, AI SDR Enterprise, Hybrid plan
- SparkPost
- Free, Startup, Growth, Enterprise
Prices checked
- Reply.io
- 2026-10-08
- SparkPost
- 2026-10-08
Email APIs monthly cost
Reply.io: $59SparkPost: $80
Different workloads, separate estimates
Separate transactional delivery from campaigns, outreach and agent inboxes. Compare monthly sends and daily caps; contacts, seats and inboxes are not sending allowances. Budget separately for dedicated IPs, validation and attachments.
Email APIs feature comparison
| Email APIs | Reply.io | SparkPost |
|---|---|---|
| Sending domains | Not listed | 1,000 |
| Active Contacts | Starts from 1.000 contacts | Not listed |
| Mailboxes | Unlimited | Not listed |
| Email warm-ups in Mailtoaster.ai | Unlimited | Not listed |
| LinkedIn automation | $69/month per account | Not listed |
| Calls & SMS | $29/month per user | Not listed |
| Data credits / month | 50 included | Not listed |
| More Data Credits | Paid Packages | Not listed |
| Domain purchase | Not listed | |
| Email search extension | Not listed | |
| Email validation | start from $20/month | Not listed |
| Dialer and Cloud Calls | $29/month per user | Not listed |
| Live Data | 50 credits + paid packages | Not listed |
| Real time B2B data by Generect | starting at $39/months | Not listed |
| Onboarding with the CSM | Included on annual | Not listed |
| Emails / month | Not listed | 100K to 2.5M |
| Webhook endpoints | Not listed | 10 |
| Sending IP | Not listed | Dedicated IPs (add-on) |
Sending domains
- Reply.io
- Not listed
- SparkPost
- 1,000
Active Contacts
- Reply.io
- Starts from 1.000 contacts
- SparkPost
- Not listed
Mailboxes
- Reply.io
- Unlimited
- SparkPost
- Not listed
Email warm-ups in Mailtoaster.ai
- Reply.io
- Unlimited
- SparkPost
- Not listed
LinkedIn automation
- Reply.io
- $69/month per account
- SparkPost
- Not listed
Calls & SMS
- Reply.io
- $29/month per user
- SparkPost
- Not listed
Data credits / month
- Reply.io
- 50 included
- SparkPost
- Not listed
More Data Credits
- Reply.io
- Paid Packages
- SparkPost
- Not listed
Domain purchase
- Reply.io
- SparkPost
- Not listed
Email search extension
- Reply.io
- SparkPost
- Not listed
Email validation
- Reply.io
- start from $20/month
- SparkPost
- Not listed
Dialer and Cloud Calls
- Reply.io
- $29/month per user
- SparkPost
- Not listed
Live Data
- Reply.io
- 50 credits + paid packages
- SparkPost
- Not listed
Real time B2B data by Generect
- Reply.io
- starting at $39/months
- SparkPost
- Not listed
Onboarding with the CSM
- Reply.io
- Included on annual
- SparkPost
- Not listed
Emails / month
- Reply.io
- Not listed
- SparkPost
- 100K to 2.5M
Webhook endpoints
- Reply.io
- Not listed
- SparkPost
- 10
Sending IP
- Reply.io
- Not listed
- SparkPost
- Dedicated IPs (add-on)
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Which email providers fit your needs?
Reply.io features & plan notes
- Multichannel sequences across email, LinkedIn, calls, SMS, and WhatsApp
- Unlimited connected mailboxes with automated email warmup
- Autonomous AI SDR agent (Jason AI) for prospecting and meeting booking
- Comprehensive REST API and MCP server support for agentic sales automation
- Email Automation (∞ mailboxes, subject to Fair Usage Policy)
- LinkedIn Automation ($69 /mo/acct)
- Calls & SMS Automation ($29 /mo/acct)
- Email warm-up (Included with every mailbox)
- Unlimited emails
- 50 Live data credits/month
- Anti-spam & deliverability suite
SparkPost features & plan notes
- Deliverability analytics
- Enterprise scale
- Predictive signals
- 10 webhook endpoints
- 1,000 sending domains
- Dedicated IPs (add-on)
How to compare email providers
Separate transactional delivery from campaigns, outreach and agent inboxes. Compare monthly sends and daily caps; contacts, seats and inboxes are not sending allowances. Budget separately for dedicated IPs, validation and attachments.
Browse Email APIs pricing