Lark vs Slack

Slack has a Proven Score of 82/100 (Proven). Lark has a Proven Score of 12/100 (Emerging). This is a Provisional score. Slack ranks higher in Team chat. Both are in Team chat on the Proven Trust Index. Vendors cannot pay to change a score. Scores can't be bought.

Score inputs

Input	Lark	Slack
Proven marketplaces	2.1 / 15	15 / 15
Member redemption clicks	5.5 / 15	15 / 15
Client quality	—	20 / 20
Operating tenure	0 / 10	10 / 10
Market standing	0 / 10	10 / 10
Connected relationships	0 / 10	0 / 10
Connected data	0 / 5	0 / 5

Best for

Shared

Use case: Team chat

Different

Stage — Lark: not recorded; Slack: Merger / Acquisition
Team size — Lark: not recorded; Slack: 1,800 employees
Region — Lark: not recorded; Slack: San Francisco, United States

Pages

Lark · Slack · Best Team chat for startups, ranked by the Proven Trust Index

Data updated 2026-10-27.

Source: Proven platform data, public records and vendor websites. Vendors cannot pay to change a score. Scores can't be bought. Data updated 2026-10-27. About the data · Proven