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Choose Slack when your team primarily needs fast, channel-based messaging, extensive integrations, and controlled collaboration with people outside your organization. Choose Lark when you want messaging bundled with meetings, documents, email, calendars, wikis, databases, and workflow tools in one workspace. Neither is universally better. The right choice depends on which work you want to centralize, how much message history and meeting capacity you need, which integrations are mandatory, and what administration or compliance controls your plan requires.
Prices and limits below are vendor-published page details accessed in 2026. Slack figures come from a localized page showing euros, while Lark figures come from its US plan page, so use them for comparison rather than as a universal quote. Confirm your country, taxes, billing term, active-user count, and contract before buying.
The short answer: Slack for a messaging hub, Lark for an integrated workspace
Slack centers work around channels: persistent conversation spaces for teams, projects, departments, and external collaboration. Its surrounding features include Huddles, clips, canvases, lists, file sharing, Workflow Builder, and a large app directory. That model suits organizations that already have separate systems for documents, calendars, meetings, and project work but want a dependable communication layer connecting them.
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For a small team that needs a free service, compare the limits rather than the headline price. Slack Free provides 90 days of searchable history, up to 10 integrations, one-to-one Huddles, and one-to-one work with external people. Lark Starter is listed at no charge for up to 20 users, with 100 GB of storage, 18 months of message history, and one-to-one meetings. Those are materially different allowances.
For a larger or regulated organization, do not decide from feature names alone. Slack’s plan table separates controls such as data residency, exports, data-loss prevention, HIPAA compliance, audit logs, administration, and support by tier. Lark also lists security and organizational controls by plan. Compare the exact control, region, contractual terms, retention behavior, and export process you need.
What Slack includes
Channels and external collaboration
Slack’s primary unit is the channel. A team can create channels for a function, customer, product, incident, or temporary project, then keep decisions and files associated with that topic. Slack Connect extends collaboration to people outside your organization, subject to the limits and administration settings of the selected plan. The official Slack features overview describes channels, Slack Connect, Huddles, clips, canvases, lists, file sharing, integrations, and Workflow Builder.
Integrations and automation
Slack’s pricing page states that its app directory contains more than 2,600 apps. That is a vendor-stated directory count, not an independent audit of integration quality or maintenance. Before committing, verify that each system your team depends on has the required Slack integration, supports the events or actions you need, and is available on your intended plan. Workflow Builder can automate common steps inside Slack, but the sophistication of a workflow still depends on the connected apps and your administrative permissions.
Huddles and lightweight collaboration
Huddles provide an in-context way to move a channel or direct-message conversation into a live discussion. On Slack Free, the plan table lists one-to-one Huddles; paid tiers expand collaboration limits. Slack also lists clips, canvases, lists, and file sharing, allowing teams to add asynchronous explanations, shared notes, task-oriented lists, and attachments without leaving the conversation environment.
Where Slack is strongest
- Teams that already have a document, calendar, meeting, and project-management stack.
- Organizations that need a mature channel convention across many departments or customer-facing projects.
- Workplaces where external collaboration and a broad app ecosystem are central requirements.
- Buyers that need to select administration, security, compliance, support, or AI capabilities by plan.
What Lark includes
A suite rather than a standalone chat layer
Lark’s plan materials group Messenger with Calendar, Meetings, Docs, Base, Wiki, Mail, Approval, OKR, and AnyCross. The Lark collaboration overview presents these products as an integrated workspace. In practice, that means a team can discuss a subject in Messenger, schedule a meeting, create a document, organize structured information in Base, publish reference material in Wiki, and route an approval without assembling every capability from separate vendors.
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Meetings, documents, and structured work
The suite model is useful when conversations routinely turn into documents, records, approvals, or recurring processes. It can reduce the number of browser tabs and identities employees use, but consolidation is only valuable if the included tools meet your standards for editing, permissions, search, retention, and export. A team that prefers its existing specialist tools may use only a fraction of Lark’s bundle.
Where Lark is strongest
- Teams seeking one vendor for messaging plus meetings, documents, mail, calendars, databases, wikis, and workflow functions.
- Organizations willing to standardize processes around a single integrated workspace.
- Growing teams for which meeting capacity, storage, and persistent history matter more than a large third-party app directory.
- Buyers evaluating the total cost of replacing several separate work systems, not merely the cost of chat seats.
Slack vs. Lark at a glance
| Decision area | Slack | Lark | What to verify |
|---|---|---|---|
| Core model | Channel-centered workplace messaging with collaboration features and integrations. | Messaging bundled with meetings, documents, mail, calendar, wiki, Base, and workflow tools. | Whether your team wants a communication layer or a broader suite. |
| Free entry point | Free plan with 90 days of searchable history, up to 10 integrations, one-to-one Huddles, and one-to-one external work. | Starter at no charge for up to 20 users, 100 GB storage, 18 months of message history, and one-to-one meetings. | Actual active users, history requirements, storage, and meeting pattern. |
| App ecosystem | Pricing page states more than 2,600 apps in the app directory. | Integrated first-party suite; third-party availability depends on the specific product and plan. | Availability, permissions, maintenance, and tier requirements for every must-have app. |
| Meetings | Free Huddles are one-to-one; paid tiers expand collaboration limits. | Starter meetings are one-to-one; Pro lists meetings for up to 500 participants. | Normal meeting size, maximum event size, recording needs, and geographic availability. |
| Message history | Free access is limited to 90 days; paid-plan retention and export behavior vary. | Starter lists 18 months; Basic and Pro list permanent message history. | Retention policy, legal hold, export rights, and deletion controls. |
| Enterprise controls | Plan table distinguishes data residency, exports, DLP, HIPAA compliance, audit logs, and other controls. | Plan table lists security and organizational controls by tier. | Exact control wording, region, contract, and implementation responsibility. |
The table is a planning aid, not a claim that similarly named features are equivalent. Ask each vendor to map your requirements to a specific plan and written terms.
Pricing and plan limits you should budget around
Slack prices shown on the retrieved localized page
Slack’s official pricing page displayed Pro at €6.75 per user per month when billed annually and Business+ at €15 per user per month when billed annually. The same localized page displayed monthly rates of €8.25 for Pro and €18 for Business+. Enterprise+ pricing was listed as available from sales. The Free plan listed 90 days of searchable history and up to 10 apps.
These are regional euro figures from the page accessed in 2026, not a global price list. Slack may show different currencies, taxes, packaging, or availability at checkout. Calculate the annual quote for your actual number of active users and include any required add-ons or higher-tier controls.
Lark prices on the current US plan comparison
Lark’s official US plan page lists the following main comparison details:
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|---|---|---|---|---|---|
| Starter | $0 per user per month | Up to 20 users | 100 GB | 18 months | One-to-one meetings |
| Basic | $6 per user per month, billed annually | Up to 500 users | 5 TB | Permanent | Not stated in the cited summary |
| Pro | $12 per user per month, billed annually | Up to 500 users | 15 TB | Permanent | Up to 500 participants |
| Enterprise | Contact sales | Unlimited users listed | Not stated in the cited summary | Not stated in the cited summary | Confirm in quote |
Lark’s pages present plans in more than one context. The figures above use the main current US comparison for numeric details. Confirm the checkout quote, taxes, billing commitment, regional availability, and contract terms for your organization.
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Why the displayed numbers are not an apples-to-apples price comparison
- Slack’s cited figures are localized euro rates with both annual-billing and monthly-billing displays; Lark’s cited Basic and Pro figures are US rates billed annually.
- The products bundle different capabilities. Lark’s subscription may replace some separate tools, while Slack is commonly evaluated alongside existing meeting, document, calendar, and project systems.
- “Per user” can mean different billing populations, such as active members, provisioned accounts, or contracted seats. Confirm the definition in your quote.
- Taxes, currency conversion, negotiated discounts, add-ons, support packages, and enterprise terms can change the total.
Compare the capabilities that affect daily work
Messaging and integrations
Slack is the more natural starting point when your organization’s work already flows through many external services and you want conversations to bring their alerts, records, and actions together. Its app-directory count is large, but count alone does not prove that a specific connector supports your security model or the exact actions you need.
Lark is more compelling when the desired outcome is fewer separate work surfaces. Evaluate whether its Messenger, Docs, Base, Wiki, Mail, Calendar, Meetings, Approval, and OKR tools can cover real processes such as onboarding, content review, sales handoffs, incident records, or expense approvals. Do not count a bundled tool as a replacement until users can complete the full process, including permissions, search, export, and retention.
History, records, and search
A free tier can become unsuitable when a team needs to retrieve older decisions. Slack Free’s 90-day searchable-history allowance and Lark Starter’s 18-month allowance should be tested against your retention policy, not just your current message volume. Ask how archived content is searched, whether files follow the same retention period, what administrators can export, and how deletion requests interact with legal or regulatory obligations.
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Paid plans may provide longer or permanent history, but “permanent” in a plan table does not by itself answer every records question. Confirm retention configuration, deletion workflows, auditability, legal holds, and the scope of exports before using either service as an official record system.
Meetings and asynchronous communication
Slack Free Huddles and Lark Starter meetings are both one-to-one in the cited plan details. That is sufficient for a quick coaching conversation or troubleshooting session, but not for an all-hands meeting. Lark Pro lists meetings for up to 500 participants. Slack’s paid tiers expand collaboration limits, but the exact limit relevant to your plan and region should be checked in the current plan table and quote.
Also compare the behaviors that headline participant limits omit: joining as a guest, recording, screen sharing, moderation, dial-in, captions, retention of recordings, and administration of external attendees. A high maximum is irrelevant if your normal meeting requires a capability your selected tier does not include.
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Storage and shared knowledge
Lark’s US comparison explicitly lists 100 GB for Starter, 5 TB for Basic, and 15 TB for Pro. Slack’s cited feature and plan pages emphasize messaging, files, canvases, lists, and related collaboration capabilities; storage allowances should be read directly from the current plan table for the specific tier you are considering. Compare not only capacity but also file lifecycle, permission inheritance, download and export behavior, and whether the team will keep authoritative documents in another system.
Administration, security, and compliance
Slack’s official plans and features table differentiates data residency, exports, DLP, HIPAA compliance, audit logs, administration, AI, and support by plan. Lark’s plan comparison similarly assigns security and organizational controls to tiers. Feature labels are not proof of equivalent implementation.
For sensitive or regulated work, create a requirement sheet with the exact geography, identity provider, provisioning method, audit events, retention rule, export format, incident-response commitment, encryption statement, and contractual language you need. Obtain written confirmation for the selected plan. Do not infer that a control available in one region or enterprise edition is available in every market.
Which app fits common team situations?
Choose Slack when these statements describe you
- Your primary pain is fragmented conversation, not a lack of document or database software.
- You depend on many third-party systems and want channels to surface their notifications and actions.
- External partners, customers, agencies, or contractors need structured collaboration.
- You are prepared to select a paid tier for longer history, broader collaboration, or advanced administration.
- Your users already understand channel-based work and will keep specialist tools for documents, meetings, or project tracking.
Choose Lark when these statements describe you
- You want messaging, meetings, documents, mail, calendar, wiki, structured data, and approvals in one subscription.
- Your organization is willing to standardize how teams create documents, records, and workflows.
- The Starter limits fit a small group, or the Basic and Pro allowances fit a larger team.
- Persistent history, listed storage, and larger meeting capacity are more important than access to the broadest possible app directory.
- Replacing several separate tools would offset the cost and change-management effort of adopting a suite.
When neither free tier is a safe default
Do not select a free plan merely because the first invoice is zero. A team with more than 20 users cannot stay within Lark Starter’s listed cap. A team that must search beyond 90 days or connect more than 10 Slack apps will outgrow Slack Free’s cited limits. A group that routinely holds multi-person meetings will exceed the one-to-one meeting or Huddle allowances. Calculate the point at which an upgrade is unavoidable and evaluate that paid tier from the beginning.
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- Write the non-negotiables. List required integrations, identity and provisioning needs, user count, external-collaboration cases, meeting size, history duration, storage, export format, retention, and compliance obligations.
- Define the comparison population. Use the same number of active users, guest accounts, contractors, and administrators in both quotes. State whether seasonal or occasional users need seats.
- Map requirements to plans. Use Slack’s plan table and Lark’s US plan comparison, then ask each vendor to confirm any ambiguous limit in writing for your country and edition.
- Run a representative pilot. Recreate a real project with channels or conversations, external participants, a meeting, a document, a file, an approval, a search for an older message, and an administrator export. Measure completion time and user confusion rather than relying on a feature checklist.
- Test failure and recovery paths. Remove a user, revoke an external participant, restore a deleted file if supported, export a conversation, and confirm what an administrator can see. Record which actions require a higher plan.
- Model the total annual cost. Include subscription seats, taxes, currency, add-ons, support, migration, training, and the tools that will remain because the chosen app does not replace them.
- Document the operating decision. Assign owners for channel or workspace naming, retention, external sharing, integrations, onboarding, and offboarding before rollout.
Common pitfalls and how to avoid them
Comparing unlike currencies and billing terms
A euro monthly display and a US annual-billing price cannot be converted into a universal winner without the buyer’s country, taxes, exchange rate, seat count, and contract. Compare final quotes on the same annual basis.
Treating a directory count as integration quality
Slack’s “more than 2,600 apps” statement describes the directory size supplied by the vendor. It does not establish that every app is equally maintained, secure, deep, or available on every plan. Test your critical connectors and their permission scopes.
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Assuming permanent history solves records management
Lark Basic and Pro list permanent message history, while Slack paid tiers expand history and controls. Neither phrase alone defines your legal hold, export, deletion, or data-residency outcome. Validate the full records workflow.
Buying a suite without changing work practices
Lark’s breadth can be valuable only if people use the included documents, databases, calendars, mail, wikis, and approvals. If your organization will continue operating separate systems for every function, the bundle may add unused capability rather than savings.
Choosing a meeting plan from its maximum
A 500-participant ceiling on Lark Pro is useful for a large event, but your decision may depend more on recording retention, moderation, guest access, or recurring meeting administration. Evaluate the normal and exceptional meeting cases separately.
Overlooking external-collaboration governance
Slack Free lists one-to-one work with external people, and Slack Connect behavior depends on plan and administration. Lark’s external-sharing and guest behavior should be confirmed for your chosen edition. Define who may invite outsiders, what they can access, and how access is revoked.
How to make the final decision
Score each product against the requirements that would be expensive or risky to compromise: mandatory integrations, history and export, meeting capacity, storage, identity and administration, compliance, and total annual cost. Give extra weight to requirements that cannot be solved with training or a workaround.
If Slack meets those hard requirements and your existing tools are working well, its channel-first model and integration breadth are the lower-disruption choice. If Lark can replace several systems that your team is prepared to adopt, compare the cost and governance of that consolidation rather than comparing chat prices alone. In both cases, make the purchase decision from a plan-specific quote and a realistic pilot, not from a generic feature list.
Bottom line
Slack is the stronger fit for an integration-rich messaging hub with channels and external collaboration. Lark is the stronger fit for a team that wants messaging embedded in a wider work suite. Check history, meetings, storage, integrations, administration, compliance, geography, and the complete annual quote before selecting either one.
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