Comparisons · Last updated: October 12, 2026
SafePrompt Alternative: What Text Screening Can't Stop
Prices last checked 2026-10-12 on safeprompt.dev. Comparison is factual and scoped: SafePrompt is a strong prompt-injection detection API. This page explains where its scope ends and what covers the rest.
The scope gap, in SafePrompt's own words
SafePrompt's own scope documentation states: "Your app owns permissions and tool access." They screen text — prompts, tool outputs, retrieved documents, agent-to-agent messages — and return a safe/unsafe verdict. They do not authorize agent tool calls, enforce action policies, deploy canaries or honeypots, or gate irreversible actions.
Rogue-Agent Defense starts where that scope ends: the agent-action layer.
Honest comparison
| SafePrompt | Rogue-Agent Defense | |
|---|---|---|
| What it guards | Text: prompts, tool outputs, documents, agent-to-agent messages | Text and actions: every tool call is authorized pre-flight (ALLOW / APPROVE / BLOCK) |
| Injection detection | Three-layer pipeline (patterns → reference checking → AI semantic layer); benchmark suite re-run every 6 hours, per-case results public | Injection shield scoring ~70 attack-pattern classes; built-in red-team self-test with per-class block rates |
| Policy engine | Not covered — "your app owns permissions and tool access" | Per-action policies: tool allowlists, spend caps, data-boundary rules, human-approval gates for irreversible actions |
| Canary tripwires | Not covered | Canary/honeytoken system: plant fake secrets in documents; leak triggers instant alert + auto-quarantine |
| Anomaly detection | Not stated | Cost spikes, repeated failures, unusual tools, loop detection |
| Kill switch | Not stated | One-click agent quarantine/revocation |
| Integration | One POST API, npm/pip SDKs, LangChain wrappers, Chrome extension | HTTPS API (/v1/events, /v1/policy/check, /v1/shield/score), designed for n8n workflows |
| Pricing model | Subscription: Free (10,000 checks/mo), Starter $29/mo (500,000 checks), Business $99/mo (1,000,000 checks) | One-time: Pro $79 once, Team $149 once |
| Transparency | Public benchmarks, open-source SDK, published data-retention policy | Red-team self-test results in-app, open HTTPS API |
SafePrompt facts sourced from safeprompt.dev homepage, /benchmarks, /blog, and GitHub docs, checked 2026-10-12. SafePrompt's free tier is generous (10,000 checks/month, no card) — genuinely useful, and its reproducible benchmarks are best-in-class for this niche.
The pricing math: subscription vs one-time
SafePrompt Starter: $29/mo × 12 = $348/year
Rogue-Agent Defense Pro: $79 once
One year of SafePrompt Starter costs about 4.4× Rogue-Agent Defense Pro. Break-even: $79 ÷ $29 ≈ 2.7 months — after that, every month of SafePrompt is money you wouldn't have spent.
If your project is a side project or a small team, subscription fatigue is real: $29/mo forever for a tool your agent stack runs through is a different purchase than $79 once.
When each one is the right call
- Choose text-screening (SafePrompt) if your agent has no tools — a chat widget or support bot that only answers. Screening the text is the whole job there.
- Choose action-layer defense (Rogue-Agent Defense) if your agent does things: sends email, runs code, queries databases, books, spends, moves files. An injected instruction that survives text screening still can't exfiltrate data if the policy engine blocks the tool call — and a canary token catches the leak if it does.
- Use both if you want defense in depth: screen the text, then police the actions.
Try the action layer free — no signup
Generate a real canary token right now, in your browser, with nothing stored server-side:
Open the free canary-token generator →
Paste the token into a document your agent reads. If an injected instruction ever tricks the agent into leaking that doc, the token trips an alert. It's the exact attack class text-screening alone can't see.
FAQ
What is the difference between SafePrompt and Rogue-Agent Defense?
SafePrompt is a prompt-injection detection API: it screens text and returns a safe/unsafe verdict. Rogue-Agent Defense adds the agent-action layer SafePrompt's own scope page disclaims: a policy engine that authorizes every tool call (ALLOW / APPROVE / BLOCK), plus canary-token tripwires that fire alerts when an agent leaks planted secrets.
Is Rogue-Agent Defense really a one-time price?
Yes. Pro is $79 once, Team is $149 once — no subscription, no monthly invoice. SafePrompt Starter is $29/month ($348/year). Break-even is roughly 2.7 months. Prices last checked 2026-10-12.
Does Rogue-Agent Defense detect prompt injection too?
Yes. It includes an injection shield that scores inbound messages and tool outputs against about 70 attack-pattern classes, plus a built-in red-team self-test that reports block rates per attack class.
Which should I choose: SafePrompt or Rogue-Agent Defense?
If your agents have no tools — a chat widget that only answers — a text-screening API is enough. If your agents take actions (send email, run code, query databases, move data), you need a policy layer that decides what the agent is allowed to do. That's what Rogue-Agent Defense adds.
Stop prompt injection at the action layer.
Free plan · Pro $79 one-time · Team $149 one-time