documentTHE COMPARISON DESK
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SLA ≠ measured uptime. Prices use different billing units. Read the comparison notes →
| Comparison field | Zoho ZeptoMailDeveloper platforms |
|---|---|
| PricingBilling model | Prepaid creditsSource ↗ |
| PricingSelected paid rateSelected plans, not equivalent baskets. USD unless stated; taxes, add-ons and regional terms may differ. | Needs confirmation Review detailsThe current pricing page did not expose a readable credit price. Indexed older prices predate the announced July 1, 2026 pricing change and are not used as current quotes. Reviewed 2026-09-08 Reviewed source 1 ↗ |
| PricingFree tier / trial | 10,000 transactional emails (one free credit), valid for one month.Source ↗ |
| PricingOverage | Purchase more credits or enable auto top-up.Source ↗ |
| PricingData / attachment charges | Not stated in reviewed docs Review detailsReviewed pricing does not establish a separate data or attachment transfer rate. This is not confirmation that all such charges are zero. Reviewed 2026-09-08 Reviewed source 1 ↗ |
| PricingWhat counts as an email | 1 credit = 10,000 emails; each recipient countsSource ↗ |
| PricingCredit expiry | Credits expire 6 months after purchaseSource ↗ |
| ReliabilityOfficial incident historyProvider-reported status, not independent monitoring or a live health indicator. | Not stated in reviewed docs Review detailsA dedicated official incident-history page was not confirmed in the reviewed resources. Reviewed 2026-09-08 Reviewed source 1 ↗Reviewed source 2 ↗ |
| ReliabilityContractual uptime SLAA service commitment, not observed uptime. Eligibility, exclusions and credit rules differ. | Not stated in reviewed docs Review detailsNo email-specific numerical contractual uptime commitment was established in the reviewed materials. Reviewed 2026-09-08 Reviewed source 1 ↗Reviewed source 2 ↗ |
| ReliabilityMeasured uptime | Not measured |
| ReliabilityMeasured delivery latency | Not measured |
| ReliabilityMeasured inbox placement | Not measured |
| Sending & featuresHTTP API | AvailableSource ↗ |
| Sending & featuresSMTP relay | AvailableSource ↗ |
| Sending & featuresSDKs | Official SDK download through API documentation/dashboard; Python integration guide also available.Source ↗ |
| Sending & featuresTemplates / editor | Pre-built templates and editorSource ↗ |
| Sending & featuresWebhooks | Delivery and recipient activity eventsSource ↗ |
| Sending & featuresInbound processing | Not stated in reviewed docs Review detailsAn inbound receiving or parsing workflow was not confirmed in the reviewed product documentation. Reviewed 2026-09-08 Reviewed source 1 ↗Reviewed source 2 ↗ |
| Sending & featuresCampaigns / automation | Transactional only; promotional campaigns are not supported.Source ↗ |
| Sending & featuresAnalytics | Open and click trackingSource ↗ |
| Operations & securitySuppression management | Bounce-related suppressionSource ↗ |
| Operations & securityDaily / request limits | API documented limits include up to 340 To, 100 Cc, 100 Bcc and 60 attachments (15 MB limit); account review required.Source ↗ |
| Operations & securityLog / activity retention | Email logs and optional content: 60 days; extended storage available through support.Source ↗ |
| Operations & securityDedicated IP | Paid add-on, annual billing only; available in selected data centers.Source ↗ |
| Operations & securityHosting / region notes | Official security page lists US, Europe, China and India data centers; verify account DC availability.Source ↗ |
| Operations & securitySending domains | 100 domains/account, up to 50 Agents; 100 domains per Agent.Source ↗ |
| Operations & securitySender authentication | DKIM TXT and CNAME for Return-Path/SPF verification.Source ↗ |
| Operations & securitySSO | Not stated in reviewed docs Review detailsExternal identity-provider SSO protocols and plan eligibility were not established for this product. Reviewed 2026-09-08 Reviewed source 1 ↗Reviewed source 2 ↗ |
| Operations & securitySupport channels | 24/7 email and phone technical assistance.Source ↗ |
| Operations & securitySetup requirements | Verify a sending domain before sending; associate it with an Agent.Source ↗ |
| ResourcesWebsite | Official resourceOpen ↗ |
| ResourcesDocumentation | Official resourceOpen ↗ |
| ResourcesPricing page | Official resourceOpen ↗ |
Unconfirmed cells include review details and sources: documentation may omit a value, sources may conflict, or a current page may be unreadable. Not measured means no independent test dataset.