Bolt.new (StackBlitz)
In-browser WebContainer (Rust-backed shared memory) is the implicit state store. No dedicated memory abstraction — project files are the state. Team plan adds shared workspaces + GitHub integration.
Stale · Verified 2026-10-28 · fresh as of 2026-10-28 · 47 cited facts, 5 with a third-party source · 1 recorded change · Suggest a correction
At a glance
- Type
- WebContainer file system vendor fix
- Tier
- T2
- Section
- Coding-agent memory
- Latest release
- no releases fix
- GitHub
- stackblitz/bolt.new — ~16.6k stars, last commit 2024-12 (open-source repo, not archived) repo fix
- Pricing
- Free 1M tokens/mo (300k/day); Pro $25/mo 10M tokens; Teams $30/member/mo; Enterprise custom third-party fix
- Funding
- $135M total raised: $7.9M seed (Apr 2022); $22M Series A (Nov 2024); $105.5M Series B (Jan 2025) at ~$700M valuation third-party fix
- Freshness
- 2026-10-28 fix
- Layer
- agent-infra repo fix
- Developer activity
- OpenRank 0.46 (12-mo avg 49.24) · 2 participants — 2026-08 third-party fix
Memory taxonomy
- storage
- file
- retrieval
- injection
- persistence
- session
- update
- overwrite
- unit
- document
- governance
- user-controllable
- conflict
- n/a
When to use
Optimised for: in-browser WebContainer dev experience
Anti-fit: not for traditional codebases; WebContainer-only
Pros & cons
Pros
WebContainer-based agent — full-stack apps run in the browser; memory is grounded in actual runnable state.
Cons
Browser-runtime-only; not applicable to native or backend-heavy projects.
Claims & capabilities
Conversation context does not persist; project files do.
Technical surface
- API surface
- not applicable — web IDE
- Backend storage
- custom (browser-based WebContainer)
- Deployment
- Managed-only
- Embedding model
- not applicable — code-gen agent
- Multi-tenancy
- WebContainer-based browser-side execution — code runs client-side; server multi-tenancy details not published
- MCP
- no first-party MCP; WebContainer runtime restricts external server transports
- A2A
- searched not found
- OpenTelemetry
- searched not found
Alternatives to Bolt.new (StackBlitz) → live options ranked by shared design, licence, hosting and MCP support
Similar systems
Other coding-agent memory in the catalog, ranked by inbound references.
- Devin (Cognition) T1
Structured Knowledge items stored server-side. Three-tier scope: repo-pinned (always injected), global (recall by relevance), org/enterprise (visible to org members). Auto-generates Repo Knowledge from repo structure each session; reads past session trajectories for self-improvement; writes notes for recurring scheduled tasks.
- Aider T2
Appends conversation turns to .aider.chat.history.md in project root. restore_chat_history defaults to false — no automatic replay into new sessions. Community /session save command for JSON state snapshots. .aider.conf.yml carries static preferences.
- Augment Code T1
Real-time knowledge graph indexed from connected repos + commit history + CI/CD + tickets + docs. Separate Agent Memory layer (Sept 2025) captures session decisions/corrections/goals as discrete items with developer review/approval UI. MCP endpoint exposes the graph. Acquired by Harness (2026-10-08): Harness bought select Augment Code assets, including Cosmos, the Auggie CLI and the Context Engine, and the team joined Harness. augmentcode.com now leads with Cosmos, a software-factory agent platform.
- Letta Code T3
Letta's stateful coding-agent harness: agents rewrite their own memory blocks and skills, version context in git via MemFS (syncable to GitHub) and reflect via a periodic /sleeptime 'dreaming' process. from Letta (MemGPT) team. letta-ai/letta-code is now the main Letta source (harness, terminal UI, App Server, channels); the Letta V1 API server was retired to the archive branch of letta-ai/letta.
- Replit Agent T1
No documented built-in persistent semantic memory store. Session duration expanded to 200 min (Agent 3); Agent 4 shifts toward persistent runtimes. Temporal used for orchestration durability, not semantic memory. Cross-session memory relies on filesystem + agent-written notes.
- agentmemory (rohitg00) T3
Self-hosted persistent memory layer that captures coding-agent activity and recalls it in later sessions, positioned on public benchmark results. #7 in TeleAI Awesome-Agent-Memory
Sources (46 cited facts, 5 third-party)
Each fact links to the page it came from; the badge says who published it (how to read sources).
- What it is WebContainer file system vendor
- What it does & what's distinct In-browser WebContainer (Rust-backed shared memory) is the implicit state store. No dedi… vendor
- Claims / benefits Conversation context does not persist; project files do. vendor
- Modalities text vendor
- Created 2024-09 vendor
- License MIT repo
- GitHub stackblitz/bolt.new — ~16.6k stars, last commit 2024-12 (open-source repo, not archived) repo
- Funding $135M total raised: $7.9M seed (Apr 2022); $22M Series A (Nov 2024); $105.5M Series B (J… third-party
- Pricing Free 1M tokens/mo (300k/day); Pro $25/mo 10M tokens; Teams $30/member/mo; Enterprise cus… third-party
- Deployment Managed-only vendor
- HQ US third-party
- Founders / pedigree Eric Simons (CEO) and Albert Pai (CTO); both Chicago natives who met as teenagers; found… third-party
- Memory volume / scale no scale claim vendor
- Code/weights release Stale — last commit 2024-12 · 16,368★ repo
- Backend storage custom (browser-based WebContainer) vendor
- Multi-tenancy WebContainer-based browser-side execution — code runs client-side; server multi-tenancy … vendor
- SSO / RBAC SSO + RBAC vendor
- Consistency strong vendor
- Versioning snapshots vendor
- Tombstoning hard-delete supported vendor
- Schema evolution free-form / no schema vendor
- Namespace primitives hierarchical vendor
- Contradiction handling always overwrite (last-write-wins) vendor
- Forgetting policy user-controlled forget vendor
- MCP support no first-party MCP; WebContainer runtime restricts external server transports vendor
- Validated verticals consumer / individual + indie devs vendor
- Time to running <10min (hosted SaaS) vendor
- Anti-fit not for traditional codebases; WebContainer-only vendor
- Optimised for in-browser WebContainer dev experience vendor
- Adjacent infrastructure self-contained Bolt.new vendor
- Pros WebContainer-based agent — full-stack apps run in the browser; memory is grounded in act… vendor
- Cons Browser-runtime-only; not applicable to native or backend-heavy projects. vendor
- Project & sources bolt.new GitHub vendor
- commit-trajectory [{"ym":"2024-07","cum":38},{"ym":"2024-08","cum":60},{"ym":"2024-09","cum":67},{"ym":"20… repo
- download-trajectory [{"ym":"2015-01","monthly":0,"cum":0},{"ym":"2015-02","monthly":13,"cum":13},{"ym":"2015… registry
- 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 open-core vendor
- positioning-platform-vs-product product vendor
- taxonomy-three-layer-rollup agent-infra repo
- developer-activity-opendigger {"activity":2.74,"as_of":"2026-08","openrank_12mo":49.24,"openrank_current":0.46,"partic… third-party
- maturity beta repo
What changed
Changes to this record's lifecycle, licence, release, pricing and hosting facts, from the catalog's git history. Subscribe (Atom)