happycapy vs E2B
A detailed comparison to help you choose between happycapy and E2B.
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Verdict: E2B wins
E2B scores 4.1/5, edging out happycapy at 3.5/5. AI engineers whose agents execute generated or untrusted code and who want isolated, metered-by-the-second sandboxes instead of running that code on production servers.
happycapy Delegate browsing coding and file work to AI agents | E2B Secure cloud sandbox environment for AI agent execution and testing | |
|---|---|---|
| Rating | 3.5 (1 review) | 4.1 (1 review) |
| Pricing Model | freemium | freemium |
| Starting Price | Free tier available | Free tier available |
| Best For | Solo operators and small technical teams who want to delegate browsing, coding and file tasks to watched cloud agents without provisioning any infrastructure. | AI engineers whose agents execute generated or untrusted code and who want isolated, metered-by-the-second sandboxes instead of running that code on production servers. |
| Free Tier | ||
| API Access | ||
| Team Features | ||
| Open Source | ||
| Tags | free tierapi access | free tierapi accessopen source |
| Visit happycapy → | Visit E2B → |
happycapy
Pros
- + The live sandbox view showed every step of my research-and-file task — I could stop a wrong turn before it consumed credits.
- + One subscription spans models from several labs with per-task switching and no API keys to manage.
- + The Free plan (250 credits/month, no credit card) is enough to run several real multi-step tasks before paying.
- + Capy Mail lets tasks be triggered and answered by email, with approved-sender filtering and per-plan quota.
- + Sandbox resources scale clearly by plan (Max: 4 cores, 8GB RAM, 200GB storage) rather than being hidden behind a sales call.
Cons
- - Credits meter everything — model calls, media and Automations — and reviewers report heavy tasks run through monthly allowances fast.
- - Automations are beta and capped at 3 on Pro, undercutting the always-on automation pitch.
- - Named integrations stop at GitHub and Notion; the rest depends on community skills rather than maintained connectors.
- - No public API for programmatic control, and the exact included model count conflicts across the vendor's own materials and third-party pages.
- - Young product: review volume is thin, and users report lag in the live view and flaky scheduled runs.
E2B
Pros
- + Sub-second sandbox startup in my quickstart runs — create, execute, and read files felt like spawning a process, not provisioning infrastructure
- + Firecracker microVM isolation with outbound network controls kept agent-generated code away from my credentials and services
- + Per-second billing with storage included and a public workload estimator — I could model my ~$166/month usage case before adding the Pro base fee
- + Hobby tier is a real evaluation: $0 with a one-time $100 usage credit, no credit card, 20 concurrent sandboxes
- + Python and JavaScript SDKs with pause/resume persistence and prebuilt dependency templates shorten integration to an afternoon
Cons
- - No local-only mode — the core product assumes cloud connectivity, which fails airgapped requirements without an enterprise deal
- - Per-second CPU/RAM billing punishes sloppy sandbox lifecycle management; idle open sandboxes keep metering
- - Concurrency ceilings (20 on Hobby, 100 on Pro) require paid add-ons for larger fleets — up to 1,100 concurrent on Pro+
- - Deliberately narrow: no agent orchestration, memory, or model routing included — bring your own framework
- - Some integrations (the Vercel AI SDK 7 sandbox package) were marked experimental in the docs at time of writing
Frequently Asked Questions
Which is better, happycapy or E2B?▼
E2B scores higher at 4.1/5 vs 3.5/5 for happycapy, making it the better-rated option in our comparison.
What is the difference between happycapy and E2B?▼
happycapy: Happycapy is a sandboxed workspace where AI agents run tasks across browsing, coding and files, with connectors to other services. E2B: E2B gives each AI agent an isolated cloud sandbox to run code, browse and use tools, hosted by E2B or in your own AWS or GCP account.
Is happycapy or E2B more affordable?▼
happycapy starts at €0/mo, E2B starts at €0/mo. Check the comparison table above for current pricing.
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