Emoji & Reaction Parity
SyncRivo syncs emoji reactions across platforms, including on thread replies. Strong on Slack and Google Chat, limited on Teams and Zoom, not synced on Webex.
Why emoji parity matters
Emoji reactions are not decoration — they are lightweight acknowledgment signals that replace full messages. A quick 👀 on an incident alert means "I'm looking at this." A ✅ means "done." When those signals don't cross the platform bridge, teams on Teams don't see acknowledgments from their Slack colleagues and vice versa — creating a false picture of who is responsive and what has been acknowledged.
Reaction sync across the 5 platforms
| Source Platform | Reaction Model | SyncRivo Handling |
|---|---|---|
| Slack | Custom + Unicode emoji, any message | Add/remove synced; custom emoji dropped; posted under a single identity |
| Microsoft Teams | Fixed set (👍❤️😂😮😢😡) | Limited: outbound needs each user to connect their account; six types only |
| Google Chat | Unicode emoji reactions | Adds/removes synced; inbound depends on Workspace Events subscriptions |
| Zoom Team Chat | Unicode emoji reactions | Limited: channel reactions only; skin tones and flags dropped |
| Cisco Webex | Unicode emoji reactions | Not synced |
How Emoji Reaction Parity works in SyncRivo
Event ingestion
SyncRivo receives reaction events from the Slack Events API (reaction_added / reaction_removed), Microsoft Teams (Bot Framework reaction activities for the bot's own messages, plus a reactions subscription for other messages), Google Chat Workspace Events, and Zoom channel reaction events. Webex does not provide reaction events SyncRivo can use, so Webex reactions are not synced. Inbound payloads are signature-verified before processing.
Mapping between reaction models
Each reaction is matched to the bridged copy of the message using the message IDs SyncRivo keeps, including on thread replies. Custom Slack emoji are dropped. Teams accepts only six reaction types, and multi-codepoint emoji (such as skin tones and flags) are dropped on Zoom.
Delivery and removal
Reaction adds and removes are posted to the destination platform in real time. Relayed reactions are posted under a single identity on Slack and Zoom, and on Teams only for users who connected their own account. Admins can switch reaction sync on or off per connection.
Platform-specific behavior
Here is how Emoji Reaction Parity behaves across each messaging platform we support. Reaction fidelity is highest on Slack and Google Chat, limited on Teams and Zoom, and not available on Webex.
| Platform | Behavior | Known limitation |
|---|---|---|
| Slack | Unicode emoji reactions synced in and out via Events API, including on thread replies. | Custom Slack emoji are dropped. Reactions posted into Slack appear under a single identity, not the original reactor. |
| Microsoft Teams | Six-reaction set (like, heart, laugh, surprised, sad, angry). | Posting reactions into Teams works only for users who connected their own account; one reaction per identity. |
| Google Chat | Unicode emoji reactions synced in and out. | Inbound reactions depend on Workspace Events subscriptions. |
| Zoom Team Chat | Channel reactions synced in and out. | DM reactions are not synced; multi-codepoint emoji are dropped; reactions show as the install account. |
| Cisco Webex | Not synced. | Webex reactions are not synced in either direction. |
Frequently asked questions
- Do emoji reactions sync between Slack and Microsoft Teams?
- Yes, with limits. Reactions sync on Slack, Google Chat, Teams and Zoom, but not on Webex. On Teams, reactions posted into Teams appear only for users who connected their own account, and only the six Teams reaction types are available. Teams reactions on messages the SyncRivo bot did not post need an additional subscription. Reactions from Slack users are posted under a single identity, so the original reactor is not preserved.
- What happens with custom Slack emoji that don't exist in Teams?
- Slack supports custom emoji that are workspace-specific (e.g., :company-logo:, :party-parrot:). Custom Slack emoji reactions are not synced; they are dropped rather than translated.
- Do reaction counts sync accurately across platforms?
- Not exactly. On most destinations SyncRivo posts relayed reactions under a single identity (for example the app or the install account), so the destination shows that a reaction was added but not each individual reactor. On Teams, one reaction is shown per connected identity.
- Does reaction removal sync?
- Yes, on platforms where reactions sync. When a user removes a reaction, SyncRivo processes the remove event and removes the corresponding reaction from the bridged message where the destination allows it. Webex reactions are not synced in either direction.
Related integration guides
Three-Platform Bridges
Connect three enterprise messaging platforms simultaneously with SyncRivo's cross-platform bridges.