Voiceflow Memory
https://www.voiceflow.com/docs/documentation/build/behaviour
Agent platform. Keeps a configurable window of recent turns (default 50, range 10–100) in the {vf_memory} variable; older turns are summarized rather than dropped. Chat projects can persist history indefinitely or clear it on tab close/refresh.
Active · Verified 2026-10-23 · fresh as of 2026-10-23 · 51 cited facts, 3 with a third-party source · 2 recorded changes · Suggest a correction
At a glance
- Type
- Sliding-window buffer (vf_memory) vendor fix
- Tier
- T1
- Section
- Framework-embedded memory
- Created
- 2018-2019 (Storyflow project 2018; Voiceflow formally launched 2019) third-party fix
- Latest release
- not applicable — not OSS fix
- License
- not applicable — not OSS fix
- GitHub
- not applicable — no GitHub repo fix
- Pricing
- Free trial + usage-based billing for agencies/partners; business pricing on request vendor fix
- Funding
- $39.8M total; Series B ~$20M 2021; Series A $15M Aug 2023 led by OpenView VP third-party fix
- Freshness
- 2026-10-23 fix
- Layer
- agent-infra repo fix
- Licensing
- commercial vendor fix
- Protocols
- mcp-client, mcp-server vendor fix
- Compliance
- gdpr, hipaa, iso27001, soc2-type2 vendor fix
Memory taxonomy
- storage
- kv
- retrieval
- injection
- persistence
- session
- update
- overwrite
- unit
- fact
- governance
- user-controllable
- conflict
- last-write-wins
When to use
Optimised for: low-code chatbot designer + sliding-window buffer
Anti-fit: not for code-first developers
Pros & cons
Pros
Built specifically for voice agents — memory model accommodates dialogue flow control and slot-filling, which generic memory layers don't.
Cons
Voice-agent-tied; not useful for non-voice agentic apps.
Claims & capabilities
Pricing not published: free trial (no card) with usage-based billing for agencies/partners; businesses request a quote.
Technical surface
- API surface
- searched not found
- Backend storage
- searched not found
- Deployment
- Managed-only
- Embedding model
- searched not found
- Multi-tenancy
- searched not found
- MCP
- yes — MCP tool lets agents call tools on remote MCP servers; Voiceflow also hosts an MCP server (mcp.voiceflow.com) for managing projects from AI clients
- A2A
- searched not found
- OpenTelemetry
- searched not found
Alternatives to Voiceflow Memory → live options ranked by shared design, licence, hosting and MCP support
Similar systems
Other framework-embedded memory in the catalog, ranked by inbound references.
- Spring AI ChatMemory T3
Wraps conversation memory behind an Advisor abstraction. MessageWindowChatMemory default 20-msg sliding window (preserves system messages); pluggable ChatMemoryRepository backends (in-memory, JDBC, Cassandra, Neo4j). Memory injected as cross-cutting concern at the ChatClient level.
- Flowise Memory T1
Discontinued: Flowise (acquired by Workday, Aug 2025) was sunset in 2026 — code freeze 2026-07-29, GitHub repo archived 2026-08-13, end of life 2026-08-31. Was a visual LangChain canvas with LangChain-native memory nodes (Buffer, Buffer Window, Conversation Summary Buffer) backed by an internal chat_message DB table; Buffer Window kept the last K interactions, Summary Buffer compressed older turns while keeping recent ones verbatim.
- LangGraph Persistence T2
Distinct from LangMem. Built-in checkpointer saves graph state per super-step (short-term, thread-scoped). Store System adds long-term hierarchical key-value memory across threads with optional vector search + TTL. Postgres / Mongo / Redis stores for production.
- AutoGen Memory T2
AutoGen's memory layer: ListMemory chronological context plus teachable agents that vectorise corrections; integrates with Mem0/Zep rather than building deep memory natively. Microsoft AutoGen is in maintenance mode (community managed, bug and security fixes only), and Microsoft points new projects to Microsoft Agent Framework.
- CrewAI Memory T2
Memory subsystem inside the CrewAI orchestration framework; integrates with Mem0 for the long-term tier.
- Hermes Agent memory (Nous Research) T3
Nous Research's open-source self-improving agent keeps an agent-curated MEMORY.md/USER.md notebook injected at session start, full-text (FTS5) search over past sessions that returns raw messages without LLM summarisation, and optional Honcho user modelling. one of the most-starred agent projects of 2026.
Sources (50 cited facts, 3 third-party)
Each fact links to the page it came from; the badge says who published it (how to read sources).
- What it is Sliding-window buffer (vf_memory) vendor
- What it does & what's distinct Agent platform. Keeps a configurable window of recent turns (default 50, range 10–100) i… vendor
- Claims / benefits Pricing not published: free trial (no card) with usage-based billing for agencies/partne… vendor
- Modalities text + voice (chatbot and voice agent platforms) vendor
- Created 2018-2019 (Storyflow project 2018; Voiceflow formally launched 2019) third-party
- Mindshare 1 press ~100 (Voiceflow jobs vendor
- Funding $39.8M total; Series B ~$20M 2021; Series A $15M Aug 2023 led by OpenView VP third-party
- Customers / scale 51-200 ppl No named customers publicly disclosed on memory feature vendor
- Pricing Free trial + usage-based billing for agencies/partners; business pricing on request vendor
- Compliance SOC 2 Type II; ISO/IEC 27001; GDPR compliant; 6-month transcript retention on all plans vendor
- Data handling Standard Contractual Clauses for GDPR data transfers; all plans retain transcripts 6 mon… vendor
- Deployment Managed-only vendor
- HQ CA third-party
- Founders / pedigree Voiceflow; co-founders Braden Ream and Michael Hood (ex-Shopify); a16z-backed vendor
- Tombstoning hard-delete supported vendor
- Schema evolution free-form / no schema vendor
- Contradiction handling always overwrite (last-write-wins) vendor
- Forgetting policy user-controlled forget vendor
- MCP support yes — MCP tool lets agents call tools on remote MCP servers; Voiceflow also hosts an MCP… vendor
- Webhooks / events webhooks supported vendor
- Import / export JSON project export (proprietary) vendor
- Integration count 0 vendor
- Orchestration single-agent (per-Assistant; variables + KB) vendor
- Programmatic control declarative config + REST API vendor
- Pricing specifics tier flat-rate: Free 100 credits/mo; Pro $60/mo (10k credits); Business $150/mo/editor vendor
- Agent abstraction state-machine (chatbot flow) vendor
- Memory primitives thread/conversation (vf_memory transcript variable) vendor
- LLM lock multi-vendor (OpenAI/Anthropic/Gemini/Cohere) vendor
- Runtimes declarative cross-language vendor
- Session handling sticky session (configurable up to 100 turns; optional indefinite cross-session) vendor
- Validated verticals contact center, conversational AI, customer support vendor
- Time to running <10min (hosted SaaS) vendor
- Anti-fit not for code-first developers vendor
- Optimised for low-code chatbot designer + sliding-window buffer vendor
- Adjacent infrastructure requires Voiceflow; BYO LLM vendor
- Pros Built specifically for voice agents — memory model accommodates dialogue flow control an… vendor
- Cons Voice-agent-tied; not useful for non-voice agentic apps. vendor
- Project & sources memory docs vendor
- cost-input-usd-per-mtok 0 vendor
- cost-output-usd-per-mtok 0 vendor
- cost-tier free vendor
- cost-pricing-model free-tier vendor
- cost-last-verified 2026-06-29 vendor
- architecture-deployment-locus cloud vendor
- licensing-bucket commercial vendor
- positioning-platform-vs-product platform vendor
- taxonomy-three-layer-rollup agent-infra repo
- compliance-certifications gdpr,hipaa,iso27001,soc2-type2 vendor
- sdk-languages rest vendor
- protocol-support mcp-client,mcp-server vendor
What changed
Changes to this record's lifecycle, licence, release, pricing and hosting facts, from the catalog's git history. Subscribe (Atom)
- 2026-10-23
- Homepage “https://docs.voiceflow.com/docs/memory” → “https://www.voiceflow.com/docs/documentation/build/behaviour”
- 2026-10-22
- Pricing “Free + paid” → “Free trial + usage-based billing for agencies/partners; business pricing on request” source
- MCP support first recorded as “yes — MCP tool lets agents call tools on remote MCP servers; Voiceflow also hosts an MCP server (mcp.voiceflow.com) for managing projects from AI clients” source