Cronbox
CronBox is "Cron for the AI age" — schedule jobs in plain English and CronBox spins up an isolated agent VM that browses the web, runs code, and emails the result.
At a Glance
- Solo developers and indie hackers who need recurring AI-agent jobs
- Startup engineering teams automating ops tasks (pricing watches, digests, scrapes)
- Power users adopting AI agents but unwilling to run their own cron + sandbox infrastructure
AI Tools by Cronbox
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Cronbox
Cloud Cron Job Scheduler
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Latest News
CronBox launches on Product Hunt: 'Where AI agents work at a schedule in the cloud'
CodeRunner: Local VM-Isolated Sandbox for Claude Code and AI Agents on macOS
We Sandbox AI Agents in Production (Hacker News)
I built a mitmproxy AI agent using 4000 paid security disclosures
Products & Services
Plain-English cron for AI agents. Each scheduled run launches an isolated VM with a real browser, shell, and code execution; results are emailed and a shareable run link captures full output, screenshots, and logs.
Sister product / runtime. Production sandbox / control plane for AI agents — Firecracker microVMs with ~185ms P95 cold start, RESTful API, SSH-native workflow, OCI image support, persistent volumes, and webhook integrations. Powers CronBox.
Open-source local VM-isolated sandbox for Claude Code, Gemini CLI, OpenCode, and other AI coding agents on Apple Silicon Macs. Built on Apple's container runtime; exposes an MCP server endpoint.
Market Position
Positions itself against traditional cron-job services (Cronitor, Healthchecks, Cronhub, cron-job.org) and AI-agent runtimes (Freestyle, E2B, Cloudflare dynamic workers, Northflank sandboxes). Differentiator: plain-English scheduling + per-run sandbox VM + email delivery in a single hosted product, owned by the same team that ships the underlying InstaVM Firecracker runtime.
Leadership
Founders
Manish Kumar
Co-founder of Checksum Labs, Inc. (the entity behind CronBox) and InstaVM. Previously co-founded Fallible (Bengaluru, security/bug-bounty SaaS, founded 2015). LinkedIn headline: 'Co-founder at Fallible | Building instavm.io'.
Abhishek Anand
Co-founder of Checksum Labs, Inc. (the entity behind CronBox) and InstaVM. Previously co-founded Fallible. Earlier roles at Entrepreneur First, Scroll Media, and CA Technologies. B.E. in Information Technology from BIT Mesra. Based in Bengaluru.
Executive Team
Manish Kumar
Co-founder
Previously co-founded Fallible (Bengaluru, 2015). Currently building InstaVM. Lead maker for CronBox.
Abhishek Anand
Co-founder
Previously co-founded Fallible. Prior experience at Entrepreneur First, Scroll Media, CA Technologies. BIT Mesra graduate.
Board of Directors
Founding Story
Built by the team behind InstaVM (Firecracker-based microVMs for AI agents). The team previously founded Fallible, an Indian security/bug-bounty SaaS. CronBox grew out of InstaVM's sandbox runtime: rather than ask agents to run on a developer's laptop or a long-running server, CronBox lets users describe a job in plain English, schedules it as cron, and spins a fresh sandbox VM for every run. Branded under the parent entity Checksum Labs, Inc.
Business Model
Revenue Model
SaaS subscription. Single plan at $20/month including 20 active jobs and 2,000 monthly credits (~12 credits per run).
Pricing Tiers
Up to 20 active jobs · 2,000 monthly credits · ~12 credits per run · plain-English schedule input · sandboxed VM runtime · shared credit pool
Target Markets
- Solo developers and indie hackers who need recurring AI-agent jobs
- Startup engineering teams automating ops tasks (pricing watches, digests, scrapes)
- Power users adopting AI agents but unwilling to run their own cron + sandbox infrastructure
- Daily competitor / pricing-page watches
- Scheduled GitHub PR reviews
- Slack channel digests
- Periodic web scraping and screenshotting
- Recurring invoice/PDF generation
- YouTube video downloads + automatic shorts cutting