Both use AI to answer customer messages across email, voice and WhatsApp. The difference is the bill: respond.io charges a monthly subscription by active contacts; RespondThat charges per conversation, only when a customer actually writes. Here's the honest breakdown.
| Dimension | RespondThat | respond.io |
|---|---|---|
| Pricing model | Pay per use — $0.20 / email reply, $0.20 / voice min, $0.20 / WhatsApp chat. Prepaid credits, no monthly fee, no seats. | Subscription — plans start around $79/mo and run to $279+/mo by Monthly Active Contacts. You pay every month whether or not you get messages. |
| Free to start | 25 free email replies + 10 free voice min, no card. | 7-day trial; paid plan required for real volume. |
| Channels | Email · Voice (phone) · WhatsApp — one brand voice across all three. | 30+ channels: WhatsApp, Instagram, Facebook, TikTok, Telegram, LINE, Viber, WeChat, email, voice and more. |
| Languages | English · Español · Português · Français · Deutsch — built in from day one. | Multilingual via AI translation across channels. |
| AI capabilities | Drafts email replies, answers calls, and handles WhatsApp in your brand voice and policies (RAG). You review before send. | AI Agent: FAQ, lead qualification, routing, appointment booking, CRM updates, voice — broad orchestration. |
| Setup | Connect inbox, paste policies, start in ~2 minutes. | Multi-channel workspace setup; powerful, with more to configure. |
| Best for | Businesses with variable or seasonal message volume who refuse a fixed monthly SaaS line — you pay only when a customer writes. | High-volume teams that live across many social channels and want one orchestration layer plus deep CRM automation. |
You want to pay only when a customer actually writes — quiet months cost nothing, busy months scale automatically.
You don't want another $79+/month line item on the books, and you don't want to be billed per active contact.
Your customer conversations live mainly in email, phone and WhatsApp, and you want them answered in one consistent voice.
→ Start free, no card. Pay $0.20 per reply.
You manage 10+ messaging channels (Instagram, Facebook, TikTok, LINE, Viber, WeChat…) and need them all in one place.
You want deep CRM and automation orchestration across the whole stack, and you already budget a monthly platform fee.
Your team lives inside a multi-channel contact-center workflow all day.
→ Great tool — just a different (subscription) model.
No seats, no monthly contract. See if pay-per-use beats a flat subscription in your first week.
Start freeRespondThat is built by Dede Group (Hong Kong) — a real, founder-led company. Read our story.