Bulletproof ctrl vs Spanlens: Which is Better in 2026?
A comprehensive comparison of Bulletproof ctrl and Spanlens covering features, pricing, use cases, and which tool is the right choice for your needs.
⚡ Quick Verdict
Choose Bulletproof ctrl if:
- →You want more affordable paid plans (from $2/mo)
- →You need live pixel-art office view of every running coding agent or works with any agent that writes jsonl sessions — claude code, codex, gemini cli, aider, cline, amazon q, augment
Choose Spanlens if:
- →You need one-line instrumentation via a cli that rewrites your call sites or request logging with cost, latency and token counts for openai, anthropic and gemini
ChatGPT already recommends Bulletproof ctrl or Spanlens. Does it recommend yours?
If you're building an AI tool, run a free AI-visibility scan on your own product — we ask ChatGPT across 5 prompt angles and score how often you get named. ~30 seconds, no signup, no card.
Bulletproof ctrl vs Spanlens: At a Glance
Pricing Comparison: Bulletproof ctrl vs Spanlens
Understanding the pricing differences between Bulletproof ctrl and Spanlens is crucial for making the right choice. Here's how their plans compare side by side.
Bulletproof ctrl Pricing
Spanlens Pricing
💡 Pricing takeaway: Both Bulletproof ctrl and Spanlens offer free tiers, making it easy to try before you buy. Compare the specific plans to find the best value for your use case.
Feature-by-Feature Comparison
Here's how every feature from Bulletproof ctrl and Spanlens stacks up.
What Makes Each Tool Unique
🔵 Unique to Bulletproof ctrl
Features available in Bulletproof ctrl but not in Spanlens:
- ✓Live pixel-art office view of every running coding agent
- ✓Works with any agent that writes JSONL sessions — Claude Code, Codex, Gemini CLI, Aider, Cline, Amazon Q, Augment
- ✓Session inspector with per-turn tool calls, timing, token usage and cost
- ✓Multi-daemon view across parallel workstreams and machines
- ✓Share a read-only view by encrypted relay link or QR code
- ✓Self-hosted local daemon, no login, standalone web app
🟣 Unique to Spanlens
Features available in Spanlens but not in Bulletproof ctrl:
- ✓One-line instrumentation via a CLI that rewrites your call sites
- ✓Request logging with cost, latency and token counts for OpenAI, Anthropic and Gemini
- ✓Agent workflow tracing in a Gantt view
- ✓PII and prompt-injection detection on request content
- ✓Three-sigma anomaly detection and cheaper-model recommendations with dollar savings
- ✓Fully MIT self-host with no feature gating, plus Ollama and LangGraph tracing
Use Case Recommendations
Best for: Bulletproof ctrl
ctrl, by Bulletproof, is an observability tool for AI coding agents that renders their activity as a pixel-art office in which each running agent becomes a character moving through the space. The visual conceit is doing real work: as agents complete more autonomous actions per session, the practical problem shifts from prompting to supervision, and a wall of JSONL logs is a poor supervision surface. ctrl connects to agents by watching the session files they already write — it tails the JSONL transcripts under the agent's project directory — which is why it works with anything that writes them, including Claude Code, Codex CLI, Gemini CLI, Aider, Cline, Amazon Q and Augment Code, and including those agents when run inside Cursor, Windsurf or JetBrains IDEs. Beyond the office view there is a session inspector for drilling into transcripts, tool calls and costs, showing every read, write and bash command with per-turn timing and token usage. Multi-daemon support lets one view cover parallel workstreams across several machines, which is the team case. Sharing works through an encrypted relay link or QR code so a teammate can observe without installing anything. It runs as a self-hosted local daemon started with a single npx command, needs no login, and is free.
Ideal use cases:
- •Teams or individuals who need live pixel-art office view of every running coding agent
- •Teams or individuals who need works with any agent that writes jsonl sessions — claude code, codex, gemini cli, aider, cline, amazon q, augment
- •Teams or individuals who need session inspector with per-turn tool calls, timing, token usage and cost
- •Teams or individuals who need multi-daemon view across parallel workstreams and machines
- •Anyone focused on open-source workflows
- •Anyone focused on observability workflows
Best for: Spanlens
Spanlens is an MIT-licensed LLM observability platform whose main design goal is that instrumenting an application should cost one line rather than an afternoon. A CLI initialiser rewrites the call sites for you, after which every OpenAI, Anthropic and Gemini request is logged with its cost, latency and token counts, and multi-step agent workflows are traced into a Gantt view that shows where the time and money actually went. Beyond straight logging it runs three checks that most cost dashboards do not: anomaly detection on a three-sigma basis, PII and prompt-injection detection on request content, and a model recommendation pass that proposes cheaper models with a dollar-figure saving attached rather than a vague suggestion. Recent SDK releases added Ollama support for local models and LangGraph tracing, so self-hosted and graph-structured agent stacks are covered alongside the hosted APIs. The licensing position is the sharpest part of the pitch: the vendor states the project is fully MIT with no `ee/` folder, meaning there is no enterprise-only directory carved out of the open-source repository — self-host with Docker Compose and every feature listed on the paid tiers is available at zero cost. The hosted tiers exist to sell managed retention, seats and alerting rather than to gate functionality, and the site publishes direct comparisons against Langfuse and Helicone.
Ideal use cases:
- •Teams or individuals who need one-line instrumentation via a cli that rewrites your call sites
- •Teams or individuals who need request logging with cost, latency and token counts for openai, anthropic and gemini
- •Teams or individuals who need agent workflow tracing in a gantt view
- •Teams or individuals who need pii and prompt-injection detection on request content
- •Anyone focused on llm-observability workflows
- •Anyone focused on tracing workflows
🤖 Other AI Agent Infrastructure Tools to Consider
Bulletproof ctrl and Spanlens aren't the only options. Here are other popular tools in the same space:
SuperAGI
Open-source autonomous AI agent framework with visual dashboard — 14K GitHub stars
MetaGPT
Multi-agent AI framework simulating software teams — 45K GitHub stars, builds full apps from prompts
Cerebras
Fastest LLM inference powered by the Wafer Scale Engine.
Scale AI
AI data platform for training data and model evaluation.
Roboflow
End-to-end computer vision platform for developers.
Labelbox
Enterprise data labeling platform for ML training datasets.
Is one of these your tool?
This page ranks for "Bulletproof ctrl vs Spanlens" — buyers comparing the two land here, and ChatGPT and Perplexity cite it. Claim your listing for $19 one-time — no subscription, nothing to cancel — and get a Featured badge, top placement in your category, and a permanent dofollow backlink. Prefer it ongoing? Monthly is one click away on the next page.
Frequently Asked Questions
Is Bulletproof ctrl better than Spanlens?
It depends on your needs. Bulletproof ctrl offers 6 key features including Live pixel-art office view of every running coding agent and Works with any agent that writes JSONL sessions — Claude Code, Codex, Gemini CLI, Aider, Cline, Amazon Q, Augment, while Spanlens provides 6 features including One-line instrumentation via a CLI that rewrites your call sites and Request logging with cost, latency and token counts for OpenAI, Anthropic and Gemini. Bulletproof ctrl uses a free model with a free tier, while Spanlens is freemium with free access available. Choose based on which features and pricing model align with your requirements.
Is Bulletproof ctrl cheaper than Spanlens?
Bulletproof ctrl is cheaper, starting at $2/month compared to Spanlens's $29/month. Both tools offer free tiers, so you can try each before committing. Always check the official websites for the most current pricing.
Can I use Bulletproof ctrl and Spanlens together?
Yes, many users combine Bulletproof ctrl and Spanlens in their workflow. Bulletproof ctrl excels at live pixel-art office view of every running coding agent, while Spanlens shines with one-line instrumentation via a cli that rewrites your call sites. Using both allows you to leverage the strengths of each tool, though this means managing two subscriptions — though free tiers can help manage costs.
What's the main difference between Bulletproof ctrl and Spanlens?
While both are ai agent infrastructure tools, Bulletproof ctrl emphasizes live pixel-art office view of every running coding agent, whereas Spanlens is known for one-line instrumentation via a cli that rewrites your call sites. The best choice depends on your specific workflow and feature priorities.
Learn More
📬 Get the best new AI tools delivered weekly
One concise email with fresh launches, trending picks, and featured standouts.