02 / Category
Communications
Email, SMS, push, and chat platforms that send and receive messages programmatically. Includes transactional and marketing communication APIs.
Search communications or any THI vendor
Ranked by band, then Headless Index
43 vendors scored
| Twilio | B | 84/100 | N/A | AUG 20, 2026 | -12 |
| Slack | B | 82/100 | 63.8/100 | AUG 20, 2026 | -6 |
| LiveKit | B | 80/100 | N/A | AUG 20, 2026 | — |
| Resend | B | 76/100 | 69.4/100 | AUG 20, 2026 | -19 |
| Nylas | B | 75/100 | N/A | AUG 20, 2026 | +75 |
| Knock | B | 72/100 | N/A | AUG 20, 2026 | +72 |
| SendGrid | B | 70/100 | — | AUG 20, 2026 | -14 |
| Novu | B | 69/100 | 86.2/100 | AUG 20, 2026 | +69 |
| Postmark | B | 68/100 | 67.6/100 | AUG 20, 2026 | -8 |
| Vonage | B | 67/100 | 81.9/100 | AUG 20, 2026 | -1 |
| Infobip | B | 67/100 | N/A | AUG 20, 2026 | — |
| Stream | B | 67/100 | N/A | AUG 20, 2026 | — |
| Bandwidth | B | 66/100 | 86.5/100 | AUG 20, 2026 | — |
| Ably | B | 66/100 | 78.9/100 | AUG 20, 2026 | -10 |
| Courier | B | 65/100 | N/A | AUG 20, 2026 | +65 |
| Pusher | B | 60/100 | N/A | AUG 20, 2026 | -16 |
| Mailgun | B | 60/100 | N/A | AUG 20, 2026 | -16 |
| Telnyx | C | 59/100 | 71.4/100 | AUG 20, 2026 | — |
| Mailchimp | C | 59/100 | 65/100 | AUG 20, 2026 | -13 |
| Customer.io | C | 58/100 | N/A | AUG 20, 2026 | -18 |
| Plivo | C | 56/100 | N/A | AUG 20, 2026 | -4 |
| Discord | C | 55/100 | 69.6/100 | AUG 20, 2026 | -21 |
| Plain | C | 53/100 | N/A | AUG 20, 2026 | — |
| Sinch | C | 50/100 | N/A | AUG 20, 2026 | +8 |
| MailerSend | C | 47/100 | N/A | AUG 20, 2026 | — |
| MessageBird (Bird) | C | 43/100 | 90.7/100 | AUG 20, 2026 | — |
| OneSignal | D | 38/100 | 74.2/100 | AUG 20, 2026 | -26 |
| Zendesk | F | 25/100 | N/A | AUG 20, 2026 | -51 |
| Missive | F | 25/100 | N/A | AUG 20, 2026 | — |
| Loops | F | 25/100 | N/A | AUG 20, 2026 | — |
| Listmonk | F | 25/100 | N/A | AUG 20, 2026 | — |
| Drip | F | 25/100 | N/A | AUG 20, 2026 | — |
| Constant Contact | F | 25/100 | N/A | AUG 20, 2026 | — |
| MoEngage | F | 13/100 | N/A | AUG 20, 2026 | — |
| Mailmodo | F | 13/100 | N/A | AUG 20, 2026 | — |
| Klaviyo | F | 13/100 | N/A | AUG 20, 2026 | — |
| Iterable | F | 13/100 | N/A | AUG 20, 2026 | — |
| Intercom | F | 13/100 | N/A | AUG 20, 2026 | -63 |
| Help Scout | F | 13/100 | N/A | AUG 20, 2026 | — |
| Front | F | 13/100 | N/A | AUG 20, 2026 | — |
| Brevo | F | 13/100 | N/A | AUG 20, 2026 | — |
| Braze | F | 13/100 | N/A | AUG 20, 2026 | — |
| ActiveCampaign | F | 13/100 | N/A | AUG 20, 2026 | — |
Comparison
Top 5 across the Headless Index axes
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Strongest in category
TwilioB
Headless Index 84/100
Weakest in category
ActiveCampaignF
Headless Index 13/100
Explore the Index
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